Macor MGC
Fluorophlogopite mica in a borosilicate glass matrix, about 55 % mica and 45 % glass by weight (Corning) · CAS 66402-68-4
Also known as MACOR, MGC, 9657, 9658
MACOR is Corning's machinable glass-ceramic: a white, zero-porosity material made of about 55 % fluorophlogopite mica in a borosilicate glass matrix.
Evidence level
2 of 5
Lab-measured
- 0Predicted only. No one has made it, or no measurement exists.
- 1Calculated. Only calculated or predicted values from sources.
- 2Lab-measured. Measured properties with their conditions stated.
- 3Space-relevant tests. Measured in conditions relevant to space, such as vacuum or atomic oxygen.
- 4Ground-qualified. Qualified for an application on the ground.
- 5Flown or field-proven. Flight or field results exist.
Hold 800 °C
800 °C continuous
Stay dense
0 % porosity
Be machined
very tight tolerances
Recipe, share of the weight
- SiO2 46%Silicon dioxide
- MgO 17%Magnesium oxide
- Al2O3 16%Aluminium oxide
- K2O 10%Potassium oxide
- B2O3 7%Boron oxide
- F 4%Fluorine
Best for
Machined insulators and fixtures that must hold tight tolerances, stay stable to 800 °C and not outgas in vacuum
Weakest at
Strength and toughness: 94 MPa modulus of rupture and 1.53 MPa m0.5 fracture toughness, against 345 MPa compressive strength
Risk at a glance
- People Low. Low hazard as a solid, dust is the concern
- If it fails High. Brittle fracture rather than yielding
- Corrosion Severe. Hydrochloric acid is the most aggressive test on the datasheet: about 100 mg/cm2 weight loss in 24 h.
Quick facts: MGC
| Property | Value | Basis |
|---|---|---|
| Density | 2.52 g/cm³ | 1 sourced value |
| Tensile strength | 90 MPa | 1 sourced value |
| Young's modulus | 66.9 GPa | 1 sourced value |
| Thermal conductivity | 1.46 W/(m·K) | 1 sourced value |
| Thermal expansion (CTE) | 9.3 to 12.6 ppm/K | 2 sourced values across conditions |
| Specific heat | 0.79 kJ/kg°C | 1 sourced value |
| Maximum service temperature | 800 to 1,000 °C | 2 sourced values across conditions |
What is the density of Macor (MGC)?
Macor (MGC) has a density of 2.52 g/cm³. The source and test conditions are listed in the properties table on this page.
What is the thermal conductivity of Macor (MGC)?
Macor (MGC) has a thermal conductivity of 1.46 W/(m·K). The source and test conditions are listed in the properties table on this page.
What is the coefficient of thermal expansion of Macor (MGC)?
Macor (MGC) has a coefficient of thermal expansion of 9.3 to 12.6 ppm/K. The range covers 2 sourced values across the tempers, forms and test conditions the sources report; room-temperature values are used where a source states a temperature.
What is the tensile strength of Macor (MGC)?
Macor (MGC) has a tensile strength of 90 MPa. The source and test conditions are listed in the properties table on this page.
What is the Young's modulus of Macor (MGC)?
Macor (MGC) has a Young's modulus of 66.9 GPa. The source and test conditions are listed in the properties table on this page.
What are the other names and codes for Macor (MGC)?
Macor (MGC) is also written as MACOR, MGC, 9657, 9658. Each code is printed in the source listed beside it in the designations table.
What is Macor (MGC) used for?
Uses recorded in the sources include Retaining rings at hinge points, windows and doors of the Space Shuttle Orbiter; Frame of a NASA spaceborne gamma radiation detector; Supports and components in several satellite-borne systems.
Why it exists
MACOR is used where a machinable insulator must hold tight tolerances, stay stable at high temperature, and not outgas in vacuum. Corning says it can be cut with ordinary metalworking tools, that tolerances are very tight, and that no post-firing is required. Its matrix is a borosilicate glass with about 55 % fluorophlogopite mica, and the mica flakes are randomly oriented in the microstructure, which Corning names as the key to machinability.
Where it's used
Vacuum equipment
Corning says MACOR is used as an insulator, coil support and vacuum feed-through, sealed with a compatible sealing glass for a vacuum-tight joint.
Space Shuttle and spaceborne detector
Corning says over 200 MACOR parts are on the Space Shuttle Orbiter, with retaining rings at hinge points, windows and doors, and that a NASA spaceborne gamma radiation detector uses large MACOR pieces. These are manufacturer claims.
Electrical and high-temperature insulation
Precision Ceramics says MACOR is an excellent high-voltage insulator at high temperature, with a dielectric constant of 6.03 at 1 kHz from the Corning table.
Recipe
Fluorophlogopite mica in a borosilicate glass matrix, about 55 % mica and 45 % glass by weight (Corning)
MACOR is a borosilicate glass matrix containing fluorophlogopite mica, with the mica flakes randomly oriented in the microstructure (Corning; Wikipedia). It is melted and crystallised as a glass-ceramic; no process step is given in the fetched sources.
| Ingredient | Share of the weight | What it does |
|---|---|---|
| Silicon dioxide SiO2 | 46% | Glass former and mica network |
| Magnesium oxide MgO | 17% | Mica cation |
| Aluminium oxide Al2O3 | 16% | Mica and glass network |
| Potassium oxide K2O | 10% | Mica interlayer cation |
| Boron oxide B2O3 | 7% | Borosilicate glass former |
| Fluorine F | 4% | Mica fluorine |
Weight shares are as printed in the sources.
What it can do
Hold 800 °C
800 °C continuous
measured
Corning rates continuous use at 800 °C and a 1000 °C peak with no load.
Stay dense
0 % porosity
Corning gives zero porosity and says it is clean, with no outgassing when properly baked out.
Be machined
very tight tolerances
Corning says tolerances are very tight, with surface finish below 20 µin and a polished finish of 0.5 µin-AA.
How it compares
MACOR is a machinable insulator, not a conductor. Its thermal conductivity is 1.46 W/m°C at 25 °C, far below the copper profile on this site, and its modulus of rupture is 94 MPa. Corning says its coefficient of expansion readily matches most metals and sealing glasses; the 9.3 ppm/K value is for 25 to 300 °C. Read the table rows as examples, not as a ranking, since they are different classes of material.
The same measurements for each material, so you can compare them. Each row names the key condition under the value; the full conditions and methods are in the numbered notes under Technical details. Compare every grade in the family.
| Measurement | MGC |
|---|---|
| Thermal behavior and safety | |
| Specific heat, MACORPrinted as .79 KJ/kg°C in the Corning datasheet | 0.79 kJ/kg°C |
| Thermal conductivity, MACOR | 1.46 W/m°C11 |
| Thermal diffusivity, MACOR | 7.3×10^-7 m2/s12 |
| Physical and electrical | |
| Density, MACOR | 2.52 g/cm³1 |
| Knoop hardness, MACOR | 250 kg/mm28 |
| Other measurements | |
| Young's modulus, MACOR | 66.9 GPa2 |
| Shear modulus, MACOR | 25.5 GPa3 |
| Modulus of rupture (flexural strength), Corning | 94 MPa4 |
| Flexural strength, MACOR (Morgan table) | 89 MPa5 |
| Compressive strength, MACOR | 345 MPa6 |
| Fracture toughness, MACOR | 1.53 MPa m0.57 |
| Coefficient of thermal expansion, 25 to 300 °C | 9.3 ppm/K9 |
| Coefficient of thermal expansion, 25 to 800 °C | 12.6 ppm/K10 |
| Continuous operating temperature, MACOR | 800 °C13 |
| Maximum no-load temperature, MACOR | 1000 °C14 |
| Dielectric constant, 1 kHz | 6.03 -15 |
| Dielectric constant, 8.5 GHz | 5.67 -16 |
| Loss tangent, 1 kHzPrinted as 4.7x10-3 in the Corning datasheet | 0.0047 - |
| Dielectric strength, AC average | 9.4 kV/mm17 |
| Dielectric strength, DC average | 62.4 kV/mm18 |
| Tensile strength, design properties | 90 MPa19 |
Why choose it, and why not
Good for
- Machined insulators: very tight tolerances with no post-firing, per Corning.
- Vacuum parts: zero porosity and no outgassing when properly baked out, per Corning.
- High-temperature insulation: 800 °C continuous, 1000 °C peak with no load.
Watch out for
- Strength is modest: 94 MPa modulus of rupture and 1.53 MPa m0.5 fracture toughness.
- Dielectric strength and resistivity differ by manufacturer; check the datasheet for the grade you buy.
- Machining dust is an irritant.
- The Space Shuttle and gamma-detector uses are manufacturer claims, not flight data.
MACOR is a machinable glass-ceramic with zero porosity, 800 °C continuous and 1000 °C peak use, and very tight tolerances without post-firing. Its strength is modest, with 94 MPa modulus of rupture and 1.53 MPa m0.5 toughness, and its dielectric and resistivity figures vary by source. The space uses rest on manufacturer statements, and this profile has no supply shares, process steps or flight outgassing data.
Technical details
For scientists and researchers. Everything above comes from the record below: every number with its method, its conditions and its source.
Other names and standards
The same grade under other systems, as datasheets and standards print them. Each code was checked against the page it comes from.
| System | Codes |
|---|---|
| Trade name | MACOR, MGC, 9657 (Corning glass code printed for MACOR (2015 sheet)), 9658 |
Notes
The method, full conditions and any caveat for the numbered rows above.
| # | Measurement | Method | Conditions | Caveat |
|---|---|---|---|---|
| 1 | Density, MACOR | Value printed in the Corning MACOR datasheet; Morgan and Goodfellow print the same 2.52 | form fully dense, 0 % porositytemperature not stated in the datasheet table | — |
| 2 | Young's modulus, MACOR | Printed in the Corning datasheet as 66.9 GPa (9.7x10^6 psi); Morgan prints 68 GPa for the same material, not used here | temperature 25 °C | — |
| 3 | Shear modulus, MACOR | Value printed in the Corning datasheet; the name shear_modulus is not in the canonical property file | temperature 25 °C | — |
| 4 | Modulus of rupture (flexural strength), Corning | Printed as 94 MPa (13,600 psi) in the Corning datasheet, with the note that actual characteristics of production lots may vary | temperature 25 °Cbasis minimum specified average valueform fully dense sample quantities tested by Corning | — |
| 5 | Flexural strength, MACOR (Morgan table) | Value printed in the Morgan comparison table; differs from the Corning 94 MPa, both are kept | temperature not statedbasis MACOR column of the material comparison table | — |
| 6 | Compressive strength, MACOR | Printed as 345 MPa (50,000 psi) in the Corning datasheet | temperature not stated | — |
| 7 | Fracture toughness, MACOR | Unit as printed in the Corning datasheet (also 1,390 psi in0.5) | temperature not stated | — |
| 8 | Knoop hardness, MACOR | Morgan prints the unit kg/mm2 and the value 250 for MACOR; Corning prints Knoop 100 g = 250 with no unit | load 100 gunit in source printed without unit in the Corning datasheet, unit taken from the Morgan row | — |
| 9 | Coefficient of thermal expansion, 25 to 300 °C | Printed as 93x10-7/°C in the Corning datasheet; converted to ppm/K (1 ppm/K = 10-6/K). Morgan prints 9.3 x10-6 for the same range. | temperature range 25 to 300 °Cunit in source 93x10-7/°C | — |
| 10 | Coefficient of thermal expansion, 25 to 800 °C | Printed as 126x10-7/°C in the Corning datasheet; converted to ppm/K | temperature range 25 to 800 °Cunit in source 126x10-7/°C | — |
| 11 | Thermal conductivity, MACOR | Printed as 1.46 W/m°C in the Corning datasheet; Morgan prints 1.46 W/m.K for the same grade | temperature 25 °C | — |
| 12 | Thermal diffusivity, MACOR | Printed as 7.3x10-7 m2/s in the Corning datasheet | temperature 25 °C | — |
| 13 | Continuous operating temperature, MACOR | Printed as 800 °C (1472 °F) in the Corning datasheet | basis continuous use | — |
| 14 | Maximum no-load temperature, MACOR | Printed as 1000 °C (1832 °F) in the Corning datasheet; Morgan also lists 1000 °C | basis peak, maximum no-load temperature | — |
| 15 | Dielectric constant, 1 kHz | Printed in the Corning datasheet, Electrical column | frequency 1 kHztemperature 25 °C | — |
| 16 | Dielectric constant, 8.5 GHz | Printed in the Corning datasheet, Electrical column | frequency 8.5 GHztemperature 25 °C | — |
| 17 | Dielectric strength, AC average | Printed as 9.4 KV/mm with 785 V/mil in the Corning datasheet. The printed pair does not agree (785 V/mil is about 30.9 kV/mm), so treat this value with care. | thickness 12 miltemperature 25 °Cbasis AC, average | — |
| 18 | Dielectric strength, DC average | Printed as 62.4 KV/mm with 5206 V/mil in the Corning datasheet. The printed pair does not agree (5206 V/mil is about 205 kV/mm), and Morgan prints 39.4 and Goodfellow 129 kV/mm for DC, so this value is unresolved. | thickness 12 miltemperature 25 °Cbasis DC, average | — |
| 19 | Tensile strength, design properties | Printed in the design-properties table of the SpotMaterial database page; no test condition printed | temperature not statedbasis design-properties table on the page | — |
Corrosion and compatibility
What happens when it meets other materials and environments.
| Environment | Concern | What happens |
|---|---|---|
| 5 % hydrochloric acid, pH 0.1, 24 h at 95 °C | severe | Hydrochloric acid is the most aggressive test on the datasheet: about 100 mg/cm2 weight loss in 24 h.1 |
| 5 % sodium hydroxide, pH 13.2, 6 h at 95 °C | moderate | Sodium hydroxide attacks Macor moderately: about 10 mg/cm2 in 6 h.2 |
| 0.002 N nitric acid, pH 2.8, 24 h at 95 °C | low | Dilute nitric acid causes only small weight loss.3 |
| 0.1 N sodium bicarbonate, pH 8.4, 24 h at 95 °C | low | Sodium bicarbonate causes little weight loss.4 |
| 0.02 N sodium carbonate, pH 10.9, 6 h at 95 °C | low | Sodium carbonate causes very little weight loss.5 |
| Vacuum after proper bake-out | none | Macor does not outgas in vacuum when it is properly baked out.6 |
| Acid and alkali classes (DIN, as printed by Goodfellow) | not rated | Goodfellow prints DIN water class HGB2, acid class 4 and alkali class A3 for MACOR.7 |
| # | Environment | Details | Test conditions |
|---|---|---|---|
| 1 | 5 % hydrochloric acid, pH 0.1, 24 h at 95 °C | Weight loss of about 100 mg/cm2 in the Corning test, the largest of the chemical tests printed on the datasheet. | solution 5 % HClpH 0.1time 24 htemperature 95 °Cmeasure gravimetric weight loss |
| 2 | 5 % sodium hydroxide, pH 13.2, 6 h at 95 °C | Weight loss of about 10 mg/cm2 in the Corning test. | solution 5 % NaOHpH 13.2time 6 htemperature 95 °Cmeasure gravimetric weight loss |
| 3 | 0.002 N nitric acid, pH 2.8, 24 h at 95 °C | Weight loss of about 0.6 mg/cm2 in the Corning test. | solution 0.002 N HNO3pH 2.8time 24 htemperature 95 °Cmeasure gravimetric weight loss |
| 4 | 0.1 N sodium bicarbonate, pH 8.4, 24 h at 95 °C | Weight loss of about 0.3 mg/cm2 in the Corning test. | solution 0.1 N NaHCO3pH 8.4time 24 htemperature 95 °Cmeasure gravimetric weight loss |
| 5 | 0.02 N sodium carbonate, pH 10.9, 6 h at 95 °C | Weight loss of about 0.1 mg/cm2 in the Corning test. | solution 0.02 N Na2CO3pH 10.9time 6 htemperature 95 °Cmeasure gravimetric weight loss |
| 6 | Vacuum after proper bake-out | Corning says it is clean, with no outgassing and zero porosity, and does not outgas in vacuum environments when properly baked out. | basis properly baked out, as stated by Corning; no outgassing number printed |
| 7 | Acid and alkali classes (DIN, as printed by Goodfellow) | Classes printed as a list of codes on the product page; the page does not state what each class means. | standard DIN classes as printed, no test values |
Risks and side effects
Hazards to people, what happens when a cell overheats, and how the material is handled and stored.
For people
The sources agree that MACOR is not a hazardous substance under the Corning SDS, but its dust is an irritant.
- As a solid
- The 2015 Boedeker copy of the Corning SDS assigns no GHS class, symbol or hazard statement.
- Dust
- The 2008 Corning sheet says glass powder or dust may irritate the eyes, nose and throat, and that very high exposure may affect the lungs.
If it fails
These are failure routes the sources describe. None of them is a measured flight result.
- Overload
- Corning gives a minimum average modulus of rupture of 94 MPa and says MACOR does not deform like a ductile material, so overload leads to fracture rather than yield.
- Over-temperature
- Corning rates the material at 800 °C continuous and 1000 °C peak with no load; the datasheet prints no loaded data above those limits.
- Strong acid
- In the Corning test, 5 % hydrochloric acid removes about 100 mg/cm2 in 24 h at 95 °C.
Handling and storage
- Dust control
- Keep the container closed, store in a dry area, and use a dust suppressant or HEPA vacuum for crushed glass.
- Machining
- Use a water-soluble coolant and carbide tools; no post-firing is needed after machining.
Test details
The original wording and numbers from the sources, for readers who want them.
Failure risks
| Failure | Trigger and consequence |
|---|---|
| Brittle fracture rather than yieldinghigh severity | Mechanical overload; Corning gives 94 MPa as the minimum average modulus of rupture and 1.53 MPa m0.5 fracture toughnessCorning says that, unlike ductile materials, MACOR won't deform; a crack is therefore not blunted by plastic flow (reading of the datasheet, not a failure test). |
| Use above the rated temperaturemoderate severity | Continuous use above 800 °C or no-load temperature above 1000 °CCorning gives only 800 °C continuous and 1000 °C peak no-load ratings; no data are printed for loaded use at higher temperatures. |
| Dissolution in strong acidmoderate severity | 5 % HCl at 95 °C for 24 hAbout 100 mg/cm2 weight loss in the Corning test. |
Side effects on surrounding parts
| Affects | Effect |
|---|---|
| Machine operators and the shop | Machining produces fine dust that can irritate; the dust must be kept off surfaces and out of the air. |
Handling and storage
- Avoid breathing dust and wash thoroughly after handling; keep the container closed and store in a dry area.
- Use a water-soluble coolant when machining; Corning recommends Cimstar 40 - Pink for cutting and grinding glass or ceramics.
- Use carbide tools for longer wear; high-speed steel can be used.
Mitigations
- Use a dust suppressant or HEPA vacuum when crushed glass can make airborne dust.
- Use good housekeeping so dust does not build up on surfaces.
Supply and geography
How common the raw materials are and where they come from.
MACOR (Corning Incorporated product)
Not stated in the fetched sources; a manufactured glass-ceramic, not a raw material
- Recycling
- The SDS says glass products may be recycled; Corning SAS, Nemours, France, is listed as the supplier on the 2015 sheet.
Documents
Datasheets, safety data sheets, papers and standards you can open.
Full record
The complete spore, as stored. Free to reuse under CC-BY-4.0. Images keep the licence shown with each one.
Show the full YAML
spore: profile
id: macor
spore_version: 0.2
family: technical-ceramics
name: Macor
abbreviation: MGC
role: machinable insulator
category: ceramics
type: glass-ceramics
summary: |
MACOR is Corning's machinable glass-ceramic: a white, zero-porosity material made of about 55 % fluorophlogopite mica in a borosilicate glass matrix. It is cut with ordinary metalworking tools and needs no post-firing, and Corning rates it for continuous use at 800 °C with a peak of 1000 °C under no load. The Corning datasheet gives a modulus of rupture of 94 MPa, a Young's modulus of 66.9 GPa and a thermal conductivity of 1.46 W/m°C at 25 °C.
best_for: Machined insulators and fixtures that must hold tight tolerances, stay stable to 800 °C and not outgas in vacuum
weakest_at: 'Strength and toughness: 94 MPa modulus of rupture and 1.53 MPa m0.5 fracture toughness, against 345 MPa compressive strength'
identity:
formula: Fluorophlogopite mica in a borosilicate glass matrix, about 55 % mica and 45 % glass by weight (Corning)
cas: 66402-68-4
source: boedeker-macor-sds
where: Section 3, CAS 66402-68-4 printed for 'Ceramic materials and wares, chemicals' at 100 %
designations:
- system: Trade name
code: MACOR
source: corning-macor-datasheet
where: Front page, title and trademark notice
- system: Trade name
code: MGC
source: corning-macor-datasheet
where: Applications page (p. 2), text 'MACOR MGC'
- system: Trade name
code: '9657'
note: Corning glass code printed for MACOR (2015 sheet)
source: boedeker-macor-sds
where: Section 1, Glass Code 9657
- system: Trade name
code: '9658'
note: Corning glass code 9658 for MACOR Machinable Glass-Ceramic (2008 sheet)
source: rs-macor-sds-2008
where: Page 1, Material Name line
tags:
environments: []
stresses:
- vacuum-and-outgassing
- total-radiation-dose
applications:
- structures
- thermal-control
- electronics-and-chips
- optics-and-cameras
properties:
- benchmark: density
label: Density, MACOR
value: 2.52
unit: g/cm3
scope: material
conditions:
form: fully dense, 0 % porosity
temperature: not stated in the datasheet table
method: Value printed in the Corning MACOR datasheet; Morgan and Goodfellow print the same 2.52
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Mechanical column, Density 2.52 g/cm3
- benchmark: elastic_modulus
label: Young's modulus, MACOR
value: 66.9
unit: GPa
scope: material
conditions:
temperature: 25 °C
method: Printed in the Corning datasheet as 66.9 GPa (9.7x10^6 psi); Morgan prints 68 GPa for the same material, not used here
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Mechanical column, Young's Modulus 25 °C
- benchmark: shear_modulus
label: Shear modulus, MACOR
value: 25.5
unit: GPa
scope: material
conditions:
temperature: 25 °C
method: Value printed in the Corning datasheet; the name shear_modulus is not in the canonical property file
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Mechanical column, Shear Modulus 25 °C 25.5 GPa
- benchmark: flexural_strength
label: Modulus of rupture (flexural strength), Corning
value: 94
unit: MPa
scope: material
conditions:
temperature: 25 °C
basis: minimum specified average value
form: fully dense sample quantities tested by Corning
method: Printed as 94 MPa (13,600 psi) in the Corning datasheet, with the note that actual characteristics of production lots may vary
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Mechanical column, Modulus of Rupture 25 °C, 94 MPa minimum specified average value
- benchmark: flexural_strength
label: Flexural strength, MACOR (Morgan table)
value: 89
unit: MPa
scope: material
conditions:
temperature: not stated
basis: MACOR column of the material comparison table
method: Value printed in the Morgan comparison table; differs from the Corning 94 MPa, both are kept
status: ground
source: morgan-macor
where: Property table, row Flexural Strength, MACOR column (89 MPa)
- benchmark: compressive_strength
label: Compressive strength, MACOR
value: 345
unit: MPa
scope: material
conditions:
temperature: not stated
method: Printed as 345 MPa (50,000 psi) in the Corning datasheet
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Mechanical column, Compressive strength 345 MPa
- benchmark: fracture_toughness
label: Fracture toughness, MACOR
value: 1.53
unit: MPa m0.5
scope: material
conditions:
temperature: not stated
method: Unit as printed in the Corning datasheet (also 1,390 psi in0.5)
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Mechanical column, Fracture Toughness 1.53 MPa m0.5
- benchmark: knoop_hardness
label: Knoop hardness, MACOR
value: 250
unit: kg/mm2
scope: material
conditions:
load: 100 g
unit_in_source: printed without unit in the Corning datasheet, unit taken from the Morgan row
method: Morgan prints the unit kg/mm2 and the value 250 for MACOR; Corning prints Knoop 100 g = 250 with no unit
status: ground
source: morgan-macor
where: Property table, row Knoop Hardness, unit column kg/mm2, MACOR column 250
- benchmark: cte
label: Coefficient of thermal expansion, 25 to 300 °C
value: 9.3
unit: ppm/K
scope: material
conditions:
temperature_range: 25 to 300 °C
unit_in_source: 93x10-7/°C
method: Printed as 93x10-7/°C in the Corning datasheet; converted to ppm/K (1 ppm/K = 10-6/K). Morgan prints 9.3 x10-6 for the same range.
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Thermal column, Coefficient of Expansion 25-300 °C, 93x10-7/°C
- benchmark: cte
label: Coefficient of thermal expansion, 25 to 800 °C
value: 12.6
unit: ppm/K
scope: material
conditions:
temperature_range: 25 to 800 °C
unit_in_source: 126x10-7/°C
method: Printed as 126x10-7/°C in the Corning datasheet; converted to ppm/K
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Thermal column, Coefficient of Expansion 25-800 °C, 126x10-7/°C
- benchmark: specific_heat
label: Specific heat, MACOR
value: 0.79
unit: kJ/kg°C
scope: material
conditions:
temperature: 25 °C
method: Printed as .79 KJ/kg°C in the Corning datasheet
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Thermal column, Specific Heat 25 °C
- benchmark: thermal_conductivity
label: Thermal conductivity, MACOR
value: 1.46
unit: W/m°C
scope: material
conditions:
temperature: 25 °C
method: Printed as 1.46 W/m°C in the Corning datasheet; Morgan prints 1.46 W/m.K for the same grade
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Thermal column, Thermal Conductivity 25 °C
- benchmark: thermal_diffusivity
label: Thermal diffusivity, MACOR
value: 7.3e-7
unit: m2/s
scope: material
conditions:
temperature: 25 °C
method: Printed as 7.3x10-7 m2/s in the Corning datasheet
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Thermal column, Thermal Diffusivity 25 °C
- benchmark: max_service_temp
label: Continuous operating temperature, MACOR
value: 800
unit: °C
scope: material
conditions:
basis: continuous use
method: Printed as 800 °C (1472 °F) in the Corning datasheet
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Thermal column, Continuous Operating Temperature 800 °C
- benchmark: max_service_temp
label: Maximum no-load temperature, MACOR
value: 1000
unit: °C
scope: material
conditions:
basis: peak, maximum no-load temperature
method: Printed as 1000 °C (1832 °F) in the Corning datasheet; Morgan also lists 1000 °C
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Thermal column, Maximum No Load Temperature 1000 °C
- benchmark: dielectric_constant
label: Dielectric constant, 1 kHz
value: 6.03
unit: '-'
scope: material
conditions:
frequency: 1 kHz
temperature: 25 °C
method: Printed in the Corning datasheet, Electrical column
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Electrical column, Dielectric Constant 25 °C, 1 KHz 6.03
- benchmark: dielectric_constant
label: Dielectric constant, 8.5 GHz
value: 5.67
unit: '-'
scope: material
conditions:
frequency: 8.5 GHz
temperature: 25 °C
method: Printed in the Corning datasheet, Electrical column
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Electrical column, Dielectric Constant 25 °C, 8.5 GHz 5.67
- benchmark: dissipation_factor
label: Loss tangent, 1 kHz
value: 0.0047
unit: '-'
scope: material
conditions:
frequency: 1 kHz
temperature: 25 °C
method: Printed as 4.7x10-3 in the Corning datasheet
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Electrical column, Loss Tangent 25 °C 1 KHz 4.7x10-3
- benchmark: dielectric_strength
label: Dielectric strength, AC average
value: 9.4
unit: kV/mm
scope: material
conditions:
thickness: 12 mil
temperature: 25 °C
basis: AC, average
method: Printed as 9.4 KV/mm with 785 V/mil in the Corning datasheet. The printed pair does not agree (785 V/mil is about 30.9 kV/mm), so treat this value with care.
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Electrical column, Dielectric Strength (AC) avg. at 12 mil and 25 °C
- benchmark: dielectric_strength
label: Dielectric strength, DC average
value: 62.4
unit: kV/mm
scope: material
conditions:
thickness: 12 mil
temperature: 25 °C
basis: DC, average
method: Printed as 62.4 KV/mm with 5206 V/mil in the Corning datasheet. The printed pair does not agree (5206 V/mil is about 205 kV/mm), and Morgan prints 39.4 and Goodfellow 129 kV/mm for DC, so this value is unresolved.
status: ground
source: corning-macor-datasheet
where: Properties page (p. 4), Electrical column, Dielectric Strength (DC) avg. at 12 mil and 25 °C
- benchmark: ultimate_tensile_strength
label: Tensile strength, design properties
value: 90
unit: MPa
scope: material
conditions:
temperature: not stated
basis: design-properties table on the page
method: Printed in the design-properties table of the SpotMaterial database page; no test condition printed
status: ground
source: spotmaterial-macor
where: Design properties table, row Tensile strength 90 MPa
corrosion:
- environment: 5 % hydrochloric acid, pH 0.1, 24 h at 95 °C
headline: 'Hydrochloric acid is the most aggressive test on the datasheet: about 100 mg/cm2 weight loss in 24 h.'
effect: Weight loss of about 100 mg/cm2 in the Corning test, the largest of the chemical tests printed on the datasheet.
rating: severe
conditions:
solution: 5 % HCl
pH: '0.1'
time: 24 h
temperature: 95 °C
measure: gravimetric weight loss
source: corning-macor-datasheet
where: Properties page (p. 4), section IV Chemical, Weight Loss table, 5 % HCL row ~100 mg/cm2
- environment: 5 % sodium hydroxide, pH 13.2, 6 h at 95 °C
headline: 'Sodium hydroxide attacks Macor moderately: about 10 mg/cm2 in 6 h.'
effect: Weight loss of about 10 mg/cm2 in the Corning test.
rating: moderate
conditions:
solution: 5 % NaOH
pH: '13.2'
time: 6 h
temperature: 95 °C
measure: gravimetric weight loss
source: corning-macor-datasheet
where: Properties page (p. 4), section IV Chemical, Weight Loss table, 5 % NaOH row ~10 mg/cm2
- environment: 0.002 N nitric acid, pH 2.8, 24 h at 95 °C
headline: Dilute nitric acid causes only small weight loss.
effect: Weight loss of about 0.6 mg/cm2 in the Corning test.
rating: low
conditions:
solution: 0.002 N HNO3
pH: '2.8'
time: 24 h
temperature: 95 °C
measure: gravimetric weight loss
source: corning-macor-datasheet
where: Properties page (p. 4), section IV Chemical, Weight Loss table, 0.002 N HNO3 row ~0.6 mg/cm2
- environment: 0.1 N sodium bicarbonate, pH 8.4, 24 h at 95 °C
headline: Sodium bicarbonate causes little weight loss.
effect: Weight loss of about 0.3 mg/cm2 in the Corning test.
rating: low
conditions:
solution: 0.1 N NaHCO3
pH: '8.4'
time: 24 h
temperature: 95 °C
measure: gravimetric weight loss
source: corning-macor-datasheet
where: Properties page (p. 4), section IV Chemical, Weight Loss table, 0.1 N NaHCO3 row ~0.3 mg/cm2
- environment: 0.02 N sodium carbonate, pH 10.9, 6 h at 95 °C
headline: Sodium carbonate causes very little weight loss.
effect: Weight loss of about 0.1 mg/cm2 in the Corning test.
rating: low
conditions:
solution: 0.02 N Na2CO3
pH: '10.9'
time: 6 h
temperature: 95 °C
measure: gravimetric weight loss
source: corning-macor-datasheet
where: Properties page (p. 4), section IV Chemical, Weight Loss table, 0.02 N Na2CO3 row ~0.1 mg/cm2
- environment: Vacuum after proper bake-out
headline: Macor does not outgas in vacuum when it is properly baked out.
effect: Corning says it is clean, with no outgassing and zero porosity, and does not outgas in vacuum environments when properly baked out.
rating: none
conditions:
basis: properly baked out, as stated by Corning; no outgassing number printed
source: corning-macor-datasheet
where: Front page feature list and Properties page (p. 4), last paragraph
- environment: Acid and alkali classes (DIN, as printed by Goodfellow)
headline: Goodfellow prints DIN water class HGB2, acid class 4 and alkali class A3 for MACOR.
effect: Classes printed as a list of codes on the product page; the page does not state what each class means.
rating: unknown
conditions:
standard: DIN classes as printed, no test values
source: goodfellow-macor-bar
where: Chemical Resistance table, rows DIN Water Class HGB2, DIN Acid Class 4, DIN Alkali Class A3
risks:
hazards:
- text: Not classified under 29 CFR 1910.1200 in the Boedeker copy of the Corning SDS; no GHS symbol, signal word or hazard statement is assigned.
ghs: []
source: boedeker-macor-sds
where: Section 2, Classification and GHS label elements
- text: Exposure to glass powder or dusts may be irritating to eyes, nose and throat, and at very high exposure levels the dust may affect the lungs (2008 Corning sheet, Glass Code 9658).
ghs: []
source: rs-macor-sds-2008
where: Section 2, Emergency Overview
- text: The dust created in machining can be an irritant; Corning says this can be avoided with good housekeeping and appropriate machining technique.
ghs: []
source: corning-macor-datasheet
where: Composition page (p. 7)
failure_risks:
- mode: Brittle fracture rather than yielding
trigger: Mechanical overload; Corning gives 94 MPa as the minimum average modulus of rupture and 1.53 MPa m0.5 fracture toughness
consequence: Corning says that, unlike ductile materials, MACOR won't deform; a crack is therefore not blunted by plastic flow (reading of the datasheet, not a failure test).
severity: high
source: corning-macor-datasheet
where: Properties page (p. 4), Mechanical column; front page Properties paragraph (p. 1)
- mode: Use above the rated temperature
trigger: Continuous use above 800 °C or no-load temperature above 1000 °C
consequence: Corning gives only 800 °C continuous and 1000 °C peak no-load ratings; no data are printed for loaded use at higher temperatures.
severity: moderate
source: corning-macor-datasheet
where: Properties page (p. 4), Thermal column
- mode: Dissolution in strong acid
trigger: 5 % HCl at 95 °C for 24 h
consequence: About 100 mg/cm2 weight loss in the Corning test.
severity: moderate
source: corning-macor-datasheet
where: Properties page (p. 4), section IV Chemical
side_effects:
- text: Machining produces fine dust that can irritate; the dust must be kept off surfaces and out of the air.
affects: Machine operators and the shop
source: boedeker-macor-sds
where: Section 6, Methods for containment and cleaning up; Section 7, Minimize dust generation
handling:
- text: Avoid breathing dust and wash thoroughly after handling; keep the container closed and store in a dry area.
source: boedeker-macor-sds
- text: Use a water-soluble coolant when machining; Corning recommends Cimstar 40 - Pink for cutting and grinding glass or ceramics.
source: corning-macor-datasheet
- text: Use carbide tools for longer wear; high-speed steel can be used.
source: corning-macor-datasheet
mitigations:
- text: Use a dust suppressant or HEPA vacuum when crushed glass can make airborne dust.
source: boedeker-macor-sds
- text: Use good housekeeping so dust does not build up on surfaces.
source: boedeker-macor-sds
uses:
- application: structures
device: Retaining rings at hinge points, windows and doors of the Space Shuttle Orbiter
example: Corning says over 200 distinctly shaped MACOR parts are on the Space Shuttle Orbiter, with retaining rings at all hinge points, windows and doors. The claim is the manufacturer's own.
source: corning-macor-datasheet
where: Applications page (p. 2-3), Aerospace Industry section
- application: structures
device: Frame of a NASA spaceborne gamma radiation detector
example: Large pieces of MACOR are used in a NASA spaceborne gamma radiation detector; frame corners are joined by butt-lap mechanical joints and a sealing glass. Corning's claim, not checked against a NASA document.
source: corning-macor-datasheet
where: Applications page (p. 2-3), Aerospace Industry section
- application: thermal-control
device: Supports and components in several satellite-borne systems
example: Precision Ceramics, the UK distributor, says MACOR supports and components in satellite-borne systems, giving thermal and electrical insulation. No mission named.
source: precision-ceramics-macor
where: Aerospace/Space Industry section, second bullet
- application: electronics-and-chips
device: Coil supports and vacuum feed-throughs for ultra-high-vacuum equipment
example: MACOR is used as an insulator or coil support and for vacuum feed-throughs, with a compatible sealing glass giving a vacuum-tight seal.
source: corning-macor-datasheet
where: Applications page (p. 2-3), Ultra-High Vacuum Environments section
- application: optics-and-cameras
device: Spacers, cavities and reflectors in laser assemblies
example: Precision Ceramics lists spacers, cavities and reflectors in laser assemblies, citing the precision finish and heat resistance of the material.
source: precision-ceramics-macor
where: Laser Applications section
supply:
- subject: MACOR (Corning Incorporated product)
abundance: Not stated in the fetched sources; a manufactured glass-ceramic, not a raw material
producers: []
critical_lists: []
recycling: The SDS says glass products may be recycled; Corning SAS, Nemours, France, is listed as the supplier on the 2015 sheet.
substitutes: []
source: boedeker-macor-sds
where: Section 1, Manufacturer Information; Section 6, Methods for containment and cleaning up
documents:
- title: MACOR Machinable Glass Ceramic datasheet (Corning, MACOR 01)
type: datasheet
url: https://psec.uchicago.edu/ceramics/MACOR%20Data%20Sheet.pdf
- title: MACOR Machinable Glass Ceramic, Morgan Advanced Materials product page
type: datasheet
url: https://www.morgantechnicalceramics.com/en-gb/materials/macor/
- title: MACOR Machinable Glass Ceramic Bar, Goodfellow product page (product 1000126059)
type: datasheet
url: https://www.goodfellow.com/usa/macor-glass-ceramic-bar-1000126059
- title: Macor, Wikipedia
type: database
url: https://en.wikipedia.org/wiki/Macor
- title: Safety Data Sheet MACOR, SDS ID C-587, Boedeker copy (2015)
type: sds
url: https://www.boedeker.com/Portals/0/Safety%20Data%20Sheets%20SDS/Macor-Ceramic-SDS-Safety-Data-Sheet-Boedeker-08-27-2015.PDF
year: 2015
- title: Safety Data Sheet Glass Code 9658, MACOR Machinable Glass-Ceramic, Corning copy (2008)
type: sds
url: https://docs.rs-online.com/40ac/0900766b8128c272.pdf
year: 2008
- title: MACOR Machinable Glass Ceramic brochure, Precision Ceramics (UK distributor)
type: datasheet
url: https://cdn.abicart.com/shop/ws28/75628/art18/156029318-4b33a9-Macor-Machinable-Glass-Ceramic.pdf
- title: MACOR Machinable Glass Ceramic properties, SpotMaterial design properties
type: database
url: https://spotmaterial.com/material/glass-ceramic/machinable-glass-ceramic-mgc-macor/
gaps:
- No flight or NASA document was opened for the Space Shuttle parts or the gamma detector; the uses rest on Corning and Precision Ceramics statements and are marked as manufacturer claims.
- The Corning product page (corning.com) returned HTTP 403 and was not read.
- The Sheffield DoITPOMS micrograph record returned 403; the house-of-cards microstructure description was seen only in a search snippet, so it is not recorded.
- The dielectric strength pairs printed by Corning do not match their own V/mil conversions, and Morgan (DC 39.4 kV/mm) and Goodfellow (DC 129 kV/mm, AC 45 kV/mm) print different values; the conflict is kept in the method fields.
- 'DC volume resistivity differs between sources: Corning and Goodfellow give 10^16 and 10^17 ohm-cm, Morgan gives >10^14 ohm-cm. The Corning value (printed as >10^16 ohm-cm) lost its superscript in the PDF text, so the verifier could not match it and it is not entered.'
- No UNS, EN, ASTM, AISI or other standard grade designation was found for MACOR; it is a proprietary trade product. The Corning glass code 9657 (SDS) and 9658 (2008 sheet) are recorded as trade-name designations.
- No manufacturing process, production country share or critical-mineral listing was found for MACOR in the fetched sources; the supply entry says so.
- No total mass loss, collected volatile condensable material, atomic oxygen or radiation dose number was found for MACOR, so the vacuum and radiation stresses rest on qualitative statements only.
- Poisson's ratio (0.29, Corning) is not entered because the benchmark name is not in the canonical property file.
- Glass-transition or softening temperature and the viscosity of the glass phase were not found.
- No ISO or ASTM test standard was found for the modulus of rupture or the fracture toughness; the test method is not named by the datasheet.
sources:
corning-macor-datasheet:
title: MACOR Machinable Glass Ceramic datasheet (Corning Incorporated, MACOR 01)
url: https://psec.uchicago.edu/ceramics/MACOR%20Data%20Sheet.pdf
year: 2026
kind: datasheet
license: Manufacturer datasheet (cited, not reproduced)
morgan-macor:
title: MACOR Machinable Glass Ceramic, Morgan Advanced Materials (Technical Ceramics), properties table
url: https://www.morgantechnicalceramics.com/en-gb/materials/macor/
year: 2026
kind: datasheet
license: Manufacturer web page (cited, not reproduced)
goodfellow-macor-bar:
title: MACOR Machinable Glass Ceramic Bar 20 mm x 20 mm, Goodfellow product 1000126059
url: https://www.goodfellow.com/usa/macor-glass-ceramic-bar-1000126059
kind: datasheet
license: Distributor web page (cited, not reproduced)
wikipedia-macor:
title: Macor, Wikipedia
url: https://en.wikipedia.org/wiki/Macor
kind: web
license: CC BY-SA 4.0 (cited, not reproduced)
boedeker-macor-sds:
title: Safety Data Sheet MACOR, SDS ID C-587, Revision 2.0 (2015), copy hosted by Boedeker
url: https://www.boedeker.com/Portals/0/Safety%20Data%20Sheets%20SDS/Macor-Ceramic-SDS-Safety-Data-Sheet-Boedeker-08-27-2015.PDF
year: 2015
kind: datasheet
license: Safety data sheet (cited, not reproduced)
rs-macor-sds-2008:
title: Safety Data Sheet Glass Code 9658, MACOR Machinable Glass-Ceramic, ID C-046, Revision 5.0 (2008), copy hosted by RS
url: https://docs.rs-online.com/40ac/0900766b8128c272.pdf
year: 2008
kind: datasheet
license: Safety data sheet (cited, not reproduced)
precision-ceramics-macor:
title: MACOR Machinable Glass Ceramic brochure, Precision Ceramics (UK distributor), Birmingham
url: https://cdn.abicart.com/shop/ws28/75628/art18/156029318-4b33a9-Macor-Machinable-Glass-Ceramic.pdf
kind: datasheet
license: Distributor brochure (cited, not reproduced)
spotmaterial-macor:
title: Machinable glass ceramic (MGC) MACOR, SpotMaterial design properties
url: https://spotmaterial.com/material/glass-ceramic/machinable-glass-ceramic-mgc-macor/
kind: web
license: Database web page (cited, not reproduced)
license: CC-BY-4.0
updated: '2026-10-26'
review:
status: draft
method: assistant
checked_values: 21
unreachable: 3
caveats: 5
note: 'Values were read by an AI assistant on 2026-10-26 from the pages and PDFs named in each entry. Unreachable: the Corning product page and the DoITPOMS micrograph record (both HTTP 403) and a Malaysian university PDF that did not download. Caveats: the Corning dielectric strength pairs do not match their own V/mil values; resistivity and dielectric strength differ between manufacturers; the Space Shuttle and gamma-detector uses are manufacturer claims; supply shares were not found.'
story:
risk_groups:
- title: For people
lead: The sources agree that MACOR is not a hazardous substance under the Corning SDS, but its dust is an irritant.
level: 1
verdict: Low hazard as a solid, dust is the concern
points:
- label: As a solid
line: The 2015 Boedeker copy of the Corning SDS assigns no GHS class, symbol or hazard statement.
- label: Dust
line: The 2008 Corning sheet says glass powder or dust may irritate the eyes, nose and throat, and that very high exposure may affect the lungs.
- title: If it fails
lead: These are failure routes the sources describe. None of them is a measured flight result.
points:
- label: Overload
line: Corning gives a minimum average modulus of rupture of 94 MPa and says MACOR does not deform like a ductile material, so overload leads to fracture rather than yield.
- label: Over-temperature
line: Corning rates the material at 800 °C continuous and 1000 °C peak with no load; the datasheet prints no loaded data above those limits.
- label: Strong acid
line: In the Corning test, 5 % hydrochloric acid removes about 100 mg/cm2 in 24 h at 95 °C.
- title: Handling and storage
points:
- label: Dust control
line: Keep the container closed, store in a dry area, and use a dust suppressant or HEPA vacuum for crushed glass.
- label: Machining
line: Use a water-soluble coolant and carbide tools; no post-firing is needed after machining.
why: MACOR is used where a machinable insulator must hold tight tolerances, stay stable at high temperature, and not outgas in vacuum. Corning says it can be cut with ordinary metalworking tools, that tolerances are very tight, and that no post-firing is required. Its matrix is a borosilicate glass with about 55 % fluorophlogopite mica, and the mica flakes are randomly oriented in the microstructure, which Corning names as the key to machinability.
uses:
- where: Vacuum equipment
line: Corning says MACOR is used as an insulator, coil support and vacuum feed-through, sealed with a compatible sealing glass for a vacuum-tight joint.
- where: Space Shuttle and spaceborne detector
line: Corning says over 200 MACOR parts are on the Space Shuttle Orbiter, with retaining rings at hinge points, windows and doors, and that a NASA spaceborne gamma radiation detector uses large MACOR pieces. These are manufacturer claims.
- where: Electrical and high-temperature insulation
line: Precision Ceramics says MACOR is an excellent high-voltage insulator at high temperature, with a dielectric constant of 6.03 at 1 kHz from the Corning table.
can_do:
- label: Hold 800 °C
value: 800 °C continuous
benchmark: max_service_temp
line: Corning rates continuous use at 800 °C and a 1000 °C peak with no load.
- label: Stay dense
value: 0 % porosity
line: Corning gives zero porosity and says it is clean, with no outgassing when properly baked out.
- label: Be machined
value: very tight tolerances
line: Corning says tolerances are very tight, with surface finish below 20 µin and a polished finish of 0.5 µin-AA.
compare: MACOR is a machinable insulator, not a conductor. Its thermal conductivity is 1.46 W/m°C at 25 °C, far below the copper profile on this site, and its modulus of rupture is 94 MPa. Corning says its coefficient of expansion readily matches most metals and sealing glasses; the 9.3 ppm/K value is for 25 to 300 °C. Read the table rows as examples, not as a ranking, since they are different classes of material.
compare_rows:
- label: Density
benchmark: density
- label: Thermal conductivity
benchmark: thermal_conductivity
- label: Thermal expansion
benchmark: cte
handling:
- 'Keep dust down: avoid breathing it, wash after handling, and use a HEPA vacuum or dust suppressant for crushed glass.'
- Use a water-soluble coolant and carbide tools when machining.
- Do not exceed 800 °C in continuous use, or 1000 °C peak with no load.
good_for:
- 'Machined insulators: very tight tolerances with no post-firing, per Corning.'
- 'Vacuum parts: zero porosity and no outgassing when properly baked out, per Corning.'
- 'High-temperature insulation: 800 °C continuous, 1000 °C peak with no load.'
watch_out:
- 'Strength is modest: 94 MPa modulus of rupture and 1.53 MPa m0.5 fracture toughness.'
- Dielectric strength and resistivity differ by manufacturer; check the datasheet for the grade you buy.
- Machining dust is an irritant.
- The Space Shuttle and gamma-detector uses are manufacturer claims, not flight data.
verdict: MACOR is a machinable glass-ceramic with zero porosity, 800 °C continuous and 1000 °C peak use, and very tight tolerances without post-firing. Its strength is modest, with 94 MPa modulus of rupture and 1.53 MPa m0.5 toughness, and its dielectric and resistivity figures vary by source. The space uses rest on manufacturer statements, and this profile has no supply shares, process steps or flight outgassing data.
recipe:
line: MACOR is a borosilicate glass matrix containing fluorophlogopite mica, with the mica flakes randomly oriented in the microstructure (Corning; Wikipedia). It is melted and crystallised as a glass-ceramic; no process step is given in the fetched sources.
parts:
- name: Silicon dioxide
symbol: SiO2
share_percent: 46
role: Glass former and mica network
- name: Magnesium oxide
symbol: MgO
share_percent: 17
role: Mica cation
- name: Aluminium oxide
symbol: Al2O3
share_percent: 16
role: Mica and glass network
- name: Potassium oxide
symbol: K2O
share_percent: 10
role: Mica interlayer cation
- name: Boron oxide
symbol: B2O3
share_percent: 7
role: Borosilicate glass former
- name: Fluorine
symbol: F
share_percent: 4
role: Mica fluorine
source: corning-macor-datasheet
References
Every number above carries a reference number. Click one to see the source and where in it the value comes from.
| # | Source | Type | Year | Used for |
|---|---|---|---|---|
| MACOR Machinable Glass Ceramic datasheet (Corning Incorporated, MACOR 01) | datasheet | 2026 | 33 values | |
| MACOR Machinable Glass Ceramic, Morgan Advanced Materials (Technical Ceramics), properties table | datasheet | 2026 | 2 values | |
| MACOR Machinable Glass Ceramic Bar 20 mm x 20 mm, Goodfellow product 1000126059 | datasheet | 1 value | ||
| Macor, Wikipedia | web | 0 values | ||
| Safety Data Sheet MACOR, SDS ID C-587, Revision 2.0 (2015), copy hosted by Boedeker | datasheet | 2015 | 7 values | |
| Safety Data Sheet Glass Code 9658, MACOR Machinable Glass-Ceramic, ID C-046, Revision 5.0 (2008), copy hosted by RS | datasheet | 2008 | 1 value | |
| MACOR Machinable Glass Ceramic brochure, Precision Ceramics (UK distributor), Birmingham | datasheet | 2 values | ||
| Machinable glass ceramic (MGC) MACOR, SpotMaterial design properties | web | 1 value |