Calcium silicate insulation board (Promatect-L)
Calcium silicate board: an inorganic board made from siliceous and calcareous raw materials with reinforcing fibres (Promat does not print the PROMATECT-L composition)
Also known as PROMATECT-L
Promatect-L is a medium-density calcium silicate board from Promat for heat protection in dryers, industrial furnaces and ventilation equipment.
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.
Insulation at 20 °C
0.08 W/m K at 20 °C
Classification temperature
500 °C
Strength
2.4 N/mm2 cold compressive
Board size
1200 mm wide
Recipe, share of the weight
- xonotlite not printed for PROMATECT-LCalcium silicate (xonotlite) matrix
- not printed for PROMATECT-LSiliceous raw material
- not printed for PROMATECT-LCalcareous raw material
- not printed for PROMATECT-LReinforcing fibres
Best for
Heat-protection panels in dryers, industrial furnaces and ventilation equipment, where a 500 °C classification and low conductivity are needed (Promat datasheet).
Weakest at
Low bending strength for structural use (3.1 N/mm2), no printed continuous service temperature, and dust when cut.
Risk at a glance
- People Low. Dust when cutting needs extraction
- If it fails Moderate. Breakage under bending load
- Corrosion Low. Promat says the board resists moisture. No moisture test is printed.
Quick facts: Calcium silicate insulation board (Promatect-L)
| Property | Value | Basis |
|---|---|---|
| Density | 0.45 g/cm³ | 1 sourced value |
| Thermal conductivity | 0.08 W/(m·K) | 1 sourced value |
| Specific heat | 950 J/(kg·K) | 1 sourced value |
What is the density of Calcium silicate insulation board (Promatect-L)?
Calcium silicate insulation board (Promatect-L) has a density of 0.45 g/cm³. The source and test conditions are listed in the properties table on this page.
What is the thermal conductivity of Calcium silicate insulation board (Promatect-L)?
Calcium silicate insulation board (Promatect-L) has a thermal conductivity of 0.08 W/(m·K). The source and test conditions are listed in the properties table on this page.
What is Calcium silicate insulation board (Promatect-L) used for?
Uses recorded in the sources include Dryers and industrial furnaces (heavy industry); Ventilation and air conditioning equipment (OEM); Load-bearing pipe columns (oil and gas).
Why it exists
Calcium silicate board is a lightweight, rigid insulation board. Promat's PROMATECT-L datasheet gives a classification temperature of 500 °C, a bulk density of 450 kg/m3 and a thermal conductivity of 0.08 W/m K at 20 °C. Those figures explain where the board is chosen: dryers, industrial furnaces and ventilation equipment, where it both insulates and holds its shape. The datasheet classification is not a continuous service limit.
Where it's used
Dryers and industrial furnaces
Promat lists dryers and industrial furnaces, under heavy industry, as application areas for PROMATECT-L.
Ventilation and air conditioning equipment
Promat lists ventilation and air conditioning technology, with apparatus construction, under OEM application areas.
Load-bearing pipe columns, oil and gas
Promat lists load-bearing pipe columns under oil and gas. The datasheet gives a bending strength of 3.1 N/mm2, so any structural use needs a load check.
Recipe
Calcium silicate board: an inorganic board made from siliceous and calcareous raw materials with reinforcing fibres (Promat does not print the PROMATECT-L composition)
Calcium silicate board is a rigid insulation board made from siliceous and calcareous raw materials with reinforcing fibres. CalSilBoard says its boards are mixed, formed as a slurry and autoclaved under high pressure to grow a xonotlite crystal structure. Promat does not print the composition of PROMATECT-L, so the parts below describe the general process, not a measured recipe.
| Ingredient | Share of the weight | What it does |
|---|---|---|
| Calcium silicate (xonotlite) matrix xonotlite | not printed for PROMATECT-L | The crystalline matrix formed in the autoclave; it gives the board its strength and low conductivity. |
| Siliceous raw material | not printed for PROMATECT-L | Silica source for the autoclaved calcium silicate phase. |
| Calcareous raw material | not printed for PROMATECT-L | Lime source for the calcium silicate phase. |
| Reinforcing fibres | not printed for PROMATECT-L | Add strength to the board. |
Weight shares are as printed in the sources.
What it can do
Insulation at 20 °C
0.08 W/m K at 20 °C
Promat prints a thermal conductivity of 0.08 W/m K at 20 °C. It rises to 0.11 W/m K at 400 °C, the highest temperature in the table.
Classification temperature
500 °C
Promat classifies the board to 500 °C. This is not a continuous service temperature, and the datasheet gives none.
Strength
2.4 N/mm2 cold compressive
The cold compressive strength is 2.4 N/mm2 and the bending strength is 3.1 N/mm2. The datasheet names no test standard for either.
Board size
1200 mm wide
Promat delivers the board 1200 mm wide, in lengths of 2500 or 3000 mm and thicknesses of 20 to 50 mm.
How it compares
Promat rates PROMATECT-L at 500 °C as a classification temperature and gives no continuous service temperature, so that figure should not be set against the continuous-use limits of other insulation materials. CalSilBoard, a Chinese maker of calcium silicate board, lists separate maximum and continuous service temperatures for its own grades, so the two datasheets use different limits and must be read with each one's definition. Unlike a fibre blanket, the board is rigid and can be machined, as the Promat datasheet describes.
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 | Calcium silicate insulation board (Promatect-L) |
|---|---|
| Thermal behavior and safety | |
| Thermal conductivity at 20 °C | 0.08 W/m K5 |
| Thermal conductivity at 200 °C | 0.1 W/m K6 |
| Thermal conductivity at 400 °C | 0.11 W/m K7 |
| Specific heat capacitySpecific heat capacity row, technical data table | 0.95 kJ/kg K |
| Water vapour diffusion value (mu) | 3.2 -8 |
| Physical and electrical | |
| Bulk density | 450 kg/m32 |
| Delivered board thicknessDelivery sizes, Thickness row | 20 to 50 mm11 |
| Thickness production toleranceProduction tolerances, Thickness row | 0.5 mm |
| Temperature behavior | |
| Classification temperature | 500 °C1 |
| Other measurements | |
| Cold compressive strength | 2.4 N/mm23 |
| Bending strengthBending strength row, technical data table | 3.1 N/mm2 |
| Shrinkage after 12 hours at 500 °C | 0.25 %4 |
| Alkalinity (approximate)Alkalinity row, technical data table | 9 pH9 |
| Delivered board lengthDelivery sizes, Length row | 2500 to 3000 mm10 |
| Delivered board widthDelivery sizes, Width row | 1200 mm |
| Length and width production toleranceProduction tolerances, Length and width row | 3 mm |
Why choose it, and why not
Good for
- Dryers and industrial furnaces, where Promat gives a 500 °C classification and a 0.08 W/m K conductivity at 20 °C.
- Ventilation and air conditioning equipment, which Promat lists as an OEM application area.
Watch out for
- The 500 °C figure is a classification temperature. No continuous service temperature is printed for PROMATECT-L.
- Cutting makes dust. Use extraction and observe the inhalable dust limit.
- A bending strength of 3.1 N/mm2 is low for load-bearing use without a design check.
- No space flight, vacuum or radiation data for calcium silicate board were found in the sources we hold.
Promatect-L is a calcium silicate board with datasheet values for temperature, density and conductivity. It has no space flight data, and the datasheet prints no continuous service temperature.
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 | PROMATECT-L (printed as PROMATECT®–L) |
Notes
The method, full conditions and any caveat for the numbered rows above.
| # | Measurement | Method | Conditions | Caveat |
|---|---|---|---|---|
| 1 | Classification temperature | Classification temperature row, technical data table (Promat datasheet, 2017-09) | product PROMATECT-L calcium silicate boardnote classification temperature as printed; no continuous service temperature is printed | — |
| 2 | Bulk density | Bulk density row, technical data table (Promat datasheet, 2017-09) | product PROMATECT-L calcium silicate board | — |
| 3 | Cold compressive strength | Cold compressive strength row, technical data table | product PROMATECT-L calcium silicate boardtest printed as cold compressive strength; no test standard named | — |
| 4 | Shrinkage after 12 hours at 500 °C | Shrinkage row, technical data table, printed as 500 ºC, 12 h | temperature 500 °Ctime 12 hoursproduct PROMATECT-L calcium silicate board | — |
| 5 | Thermal conductivity at 20 °C | Thermal conductivity row at 20 ºC, technical data table; test standard not named | temperature 20 °Cproduct PROMATECT-L calcium silicate board | — |
| 6 | Thermal conductivity at 200 °C | Thermal conductivity row at 200 ºC, technical data table; test standard not named | temperature 200 °Cproduct PROMATECT-L calcium silicate board | — |
| 7 | Thermal conductivity at 400 °C | Thermal conductivity row at 400 ºC, technical data table; test standard not named | temperature 400 °Cproduct PROMATECT-L calcium silicate board | — |
| 8 | Water vapour diffusion value (mu) | Water vapour diffusion value row, technical data table | product PROMATECT-L calcium silicate boardnote printed as approx. 3.2 | Printed as approximate. |
| 9 | Alkalinity (approximate) | — | product PROMATECT-L calcium silicate boardnote printed as approximate | Printed as approximate. |
| 10 | Delivered board length | — | sizes 2500 mm and 3000 mm delivery lengths | Two delivered lengths; the range covers those two sizes only. |
| 11 | Delivered board thickness | — | sizes delivered as 20, 25, 30, 40 or 50 mm | The sizes are discrete; the range runs from the smallest to the largest printed size. |
Corrosion and compatibility
What happens when it meets other materials and environments.
| Environment | Concern | What happens |
|---|---|---|
| Moist or humid air | low | Promat says the board resists moisture. No moisture test is printed.1 |
| Heating at 500 °C for 12 hours | low | Linear shrinkage of 0.25 % is printed for this heat test.2 |
| Chemical exposure | not rated | Promat says the board is chemically resistant. It names no chemical.3 |
| # | Environment | Details | Test conditions |
|---|---|---|---|
| 1 | Moist or humid air | The datasheet lists resistance to moisture and chemicals among its properties, and prints no moisture test, humidity exposure or ageing data. Hi-Temp Fabrication, a distributor, describes calcium silicate boards in general as insoluble in water and non-corroding; that is a family-level statement, not a PROMATECT-L test. | product PROMATECT-L calcium silicate boardexposure not stated in the datasheet |
| 2 | Heating at 500 °C for 12 hours | The datasheet prints linear shrinkage of 0.25 % after 12 hours at 500 °C. This is a dimensional change under heat, not corrosion, and the datasheet prints no shrinkage at other temperatures. | temperature 500 °Ctime 12 hours |
| 3 | Chemical exposure | The datasheet says the board is resistant to chemicals but names no reagent, concentration, temperature or exposure time. The claim cannot be applied to a specific chemical until the supplier confirms it. | basis datasheet statement only |
Risks and side effects
Hazards to people, what happens when a cell overheats, and how the material is handled and stored.
For people
Promat's datasheet gives no hazard classification for PROMATECT-L. Cutting it makes dust, which Promat says must be controlled.
- Dust
- Promat says to observe the maximum workplace concentration values for inhalable dust when cutting, and recommends dust extraction.
- Eye contact
- PubChem's record for generic calcium silicate, which is not this board, lists the hazard statement "Causes serious eye irritation" from some company reports.
- Fire
- Promat gives the board a building material class of A1, non-combustible, under the German DIN standard. PubChem's generic record also says calcium silicate is not combustible.
If it overheats
Heat is the main test for this board. It shrinks slightly after long heating, and the datasheet gives a classification temperature, not a service limit.
- Shrinkage
- Promat prints a shrinkage of 0.25 % after 12 hours at 500 °C.
- Limit
- The 500 °C figure is a classification temperature. The datasheet prints no continuous service temperature for PROMATECT-L.
Test details
The original wording and numbers from the sources, for readers who want them.
Failure risks
| Failure | Trigger and consequence |
|---|---|
| Shrinkage under long heatinglow severity | 12 hours at 500 °CLinear shrinkage of 0.25 % as printed. This may open gaps at joints in a lined furnace; that effect is an inference from the printed figure, not a statement in the datasheet. |
| Breakage under bending loadmoderate severity | Bending load on the boardThe datasheet prints bending strength of 3.1 N/mm2 and cold compressive strength of 2.4 N/mm2, and gives no safe working load. Design checks are needed before any load-bearing use. |
Handling and storage
- When cutting to size, observe the maximum workplace concentration values for inhalable dust and use dust extraction, as Promat recommends.
- When fixing with screws, use slot holes, as the datasheet recommends.
- PROMATECT-L can be machined with special processing machinery and suitable tools; Promat says precise machined parts can be made.
Mitigations
- Use dust extraction at cutting points, as Promat recommends for cutting to size.
Supply and geography
How common the raw materials are and where they come from.
Lime (calcium feedstock, quicklime and hydrated lime)
USGS: domestic and world resources of limestone and dolomite suitable for lime manufacture are very large.
- Top producers (2025)
- China 73.8%, India 4%, United States 3.6%, Russia 2.9%
- Critical mineral lists
- US: not listed, EU: not listed
- Recycling
- USGS lime chapter: large quantities of lime are regenerated by paper mills, and some water-treatment plants regenerate lime from softening sludge.
- Substitutes
- USGS: limestone is a substitute for lime in many applications but reacts more slowly. Cement and fly ash are potential substitutes for some construction uses of lime; no substitute for lime in calcium silicate board is named.
Silicon (silica feedstock, from quartzite)
USGS: world and domestic resources for making silicon metal and alloys are abundant; the source of the silicon is silica in various natural forms, such as quartzite.
- Top producers (2025)
- China 87%, Brazil 3.9%, Norway 2.8%, Russia 0.8%
- Critical mineral lists
- US: listed, EU: listed
- Recycling
- USGS silicon chapter: recycling is insignificant.
- Substitutes
- USGS: aluminum, silicon carbide and silicomanganese can substitute for ferrosilicon in some applications; no substitute for silica in calcium silicate board is named.
Documents
Datasheets, safety data sheets, papers and standards you can open.
| Document | Type | Year |
|---|---|---|
| PROMATECT-L Technical Data Sheet, calcium silicate boards (Promat, 2017-09) | datasheet | 2017 |
| CalSilBoard technology and technical data page (Qingdao Henry Cal Sil New Materials Co., Ltd.) | datasheet | 2025 |
| PubChem: Calcium Silicate (CID 73415800), GHS classification summary | database | 2026 |
| Mineral Commodity Summaries 2026: Lime (USGS) | report | 2026 |
| Mineral Commodity Summaries 2026: Silicon (USGS) | report | 2026 |
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: calcium-silicate-board
spore_version: 0.2
family: oxide-ceramics
name: Calcium silicate insulation board (Promatect-L)
role: rigid high-temperature insulation board
category: thermal-protection
type: reusable-tiles
summary: Promatect-L is a medium-density calcium silicate board from Promat for heat protection in dryers, industrial furnaces and ventilation equipment. Its datasheet gives a classification temperature of 500 °C, a bulk density of 450 kg/m3 and a thermal conductivity of 0.08 W/m K at 20 °C. No space flight data for calcium silicate board were found in the sources we hold.
best_for: Heat-protection panels in dryers, industrial furnaces and ventilation equipment, where a 500 °C classification and low conductivity are needed (Promat datasheet).
weakest_at: Low bending strength for structural use (3.1 N/mm2), no printed continuous service temperature, and dust when cut.
identity:
formula: 'Calcium silicate board: an inorganic board made from siliceous and calcareous raw materials with reinforcing fibres (Promat does not print the PROMATECT-L composition)'
designations:
- system: Trade name
code: PROMATECT-L
note: printed as PROMATECT®–L
source: promat-promatect-l
where: Page 1, product name in the title block
source: promat-promatect-l
where: Page 1, product name and description
tags:
environments: []
stresses: []
applications:
- thermal-control
- structures
properties:
- benchmark: classification_temperature
label: Classification temperature
value: 500
unit: °C
scope: material
conditions:
product: PROMATECT-L calcium silicate board
note: classification temperature as printed; no continuous service temperature is printed
method: Classification temperature row, technical data table (Promat datasheet, 2017-09)
status: ground
source: promat-promatect-l
where: Technical data table, Classification temperature row
- benchmark: density
label: Bulk density
value: 450
unit: kg/m3
scope: material
conditions:
product: PROMATECT-L calcium silicate board
method: Bulk density row, technical data table (Promat datasheet, 2017-09)
status: ground
source: promat-promatect-l
where: Technical data table, Bulk density row
- benchmark: compressive_strength
label: Cold compressive strength
value: 2.4
unit: N/mm2
scope: material
conditions:
product: PROMATECT-L calcium silicate board
test: printed as cold compressive strength; no test standard named
method: Cold compressive strength row, technical data table
status: ground
source: promat-promatect-l
where: Technical data table, Cold compressive strength row
- benchmark: flexural_strength
label: Bending strength
value: 3.1
unit: N/mm2
scope: material
conditions:
product: PROMATECT-L calcium silicate board
test: printed as bending strength; no test standard named
method: Bending strength row, technical data table
status: ground
source: promat-promatect-l
where: Technical data table, Bending strength row
- benchmark: linear_shrinkage
label: Shrinkage after 12 hours at 500 °C
value: 0.25
unit: '%'
scope: material
conditions:
temperature: 500 °C
time: 12 hours
product: PROMATECT-L calcium silicate board
method: Shrinkage row, technical data table, printed as 500 ºC, 12 h
status: ground
source: promat-promatect-l
where: Technical data table, Shrinkage row
- benchmark: thermal_conductivity
label: Thermal conductivity at 20 °C
value: 0.08
unit: W/m K
scope: material
conditions:
temperature: 20 °C
product: PROMATECT-L calcium silicate board
method: Thermal conductivity row at 20 ºC, technical data table; test standard not named
status: ground
source: promat-promatect-l
where: Technical data table, Thermal conductivity, 20 ºC row
- benchmark: thermal_conductivity
label: Thermal conductivity at 200 °C
value: 0.1
unit: W/m K
scope: material
conditions:
temperature: 200 °C
product: PROMATECT-L calcium silicate board
method: Thermal conductivity row at 200 ºC, technical data table; test standard not named
status: ground
source: promat-promatect-l
where: Technical data table, Thermal conductivity, 200 ºC row
- benchmark: thermal_conductivity
label: Thermal conductivity at 400 °C
value: 0.11
unit: W/m K
scope: material
conditions:
temperature: 400 °C
product: PROMATECT-L calcium silicate board
method: Thermal conductivity row at 400 ºC, technical data table; test standard not named
status: ground
source: promat-promatect-l
where: Technical data table, Thermal conductivity, 400 ºC row
- benchmark: specific_heat
label: Specific heat capacity
value: 0.95
unit: kJ/kg K
scope: material
conditions:
product: PROMATECT-L calcium silicate board
temperature: not stated in the datasheet
method: Specific heat capacity row, technical data table
status: ground
source: promat-promatect-l
where: Technical data table, Specific heat capacity row
- benchmark: water_vapour_diffusion_factor
label: Water vapour diffusion value (mu)
value: 3.2
unit: '-'
scope: material
conditions:
product: PROMATECT-L calcium silicate board
note: printed as approx. 3.2
method: Water vapour diffusion value row, technical data table
status: ground
note: Printed as approximate.
source: promat-promatect-l
where: Technical data table, Water vapour diffusion value row
- benchmark: alkalinity_ph
label: Alkalinity (approximate)
value: 9
unit: pH
scope: material
conditions:
product: PROMATECT-L calcium silicate board
note: printed as approximate
method: Alkalinity row, technical data table
status: ground
note: Printed as approximate.
source: promat-promatect-l
where: Technical data table, Alkalinity row
- benchmark: board_length
label: Delivered board length
value: 2500
value_high: 3000
bound: range
unit: mm
scope: material
conditions:
sizes: 2500 mm and 3000 mm delivery lengths
method: Delivery sizes, Length row
status: ground
note: Two delivered lengths; the range covers those two sizes only.
source: promat-promatect-l
where: Delivery sizes, Length row
- benchmark: board_width
label: Delivered board width
value: 1200
unit: mm
scope: material
conditions:
sizes: one delivery width
method: Delivery sizes, Width row
status: ground
source: promat-promatect-l
where: Delivery sizes, Width row
- benchmark: board_thickness
label: Delivered board thickness
value: 20
value_high: 50
bound: range
unit: mm
scope: material
conditions:
sizes: delivered as 20, 25, 30, 40 or 50 mm
method: Delivery sizes, Thickness row
status: ground
note: The sizes are discrete; the range runs from the smallest to the largest printed size.
source: promat-promatect-l
where: Delivery sizes, Thickness row
- benchmark: thickness_tolerance
label: Thickness production tolerance
value: 0.5
unit: mm
scope: material
conditions:
tolerance: plus or minus, as printed (± 0.5)
method: Production tolerances, Thickness row
status: ground
source: promat-promatect-l
where: Production tolerances, Thickness row
- benchmark: length_width_tolerance
label: Length and width production tolerance
value: 3
unit: mm
scope: material
conditions:
tolerance: plus or minus, as printed (± 3.0)
method: Production tolerances, Length and width row
status: ground
source: promat-promatect-l
where: Production tolerances, Length and width row
corrosion:
- environment: Moist or humid air
headline: Promat says the board resists moisture. No moisture test is printed.
effect: The datasheet lists resistance to moisture and chemicals among its properties, and prints no moisture test, humidity exposure or ageing data. Hi-Temp Fabrication, a distributor, describes calcium silicate boards in general as insoluble in water and non-corroding; that is a family-level statement, not a PROMATECT-L test.
rating: low
conditions:
product: PROMATECT-L calcium silicate board
exposure: not stated in the datasheet
source: promat-promatect-l
where: Properties and advantages, resistant to moisture and chemicals
- environment: Heating at 500 °C for 12 hours
headline: Linear shrinkage of 0.25 % is printed for this heat test.
effect: The datasheet prints linear shrinkage of 0.25 % after 12 hours at 500 °C. This is a dimensional change under heat, not corrosion, and the datasheet prints no shrinkage at other temperatures.
rating: low
conditions:
temperature: 500 °C
time: 12 hours
source: promat-promatect-l
where: Technical data table, Shrinkage row
- environment: Chemical exposure
headline: Promat says the board is chemically resistant. It names no chemical.
effect: The datasheet says the board is resistant to chemicals but names no reagent, concentration, temperature or exposure time. The claim cannot be applied to a specific chemical until the supplier confirms it.
rating: unknown
conditions:
basis: datasheet statement only
source: promat-promatect-l
where: Properties and advantages, resistant to moisture and chemicals
risks:
hazards:
- text: Cutting the board makes dust. Promat says the maximum workplace concentration values for inhalable dust must be observed, and that dust extraction is recommended.
ghs: []
source: promat-promatect-l
where: Working and processing, cutting paragraph
- text: PubChem's record for generic calcium silicate, which is not the PROMATECT-L board, lists the hazard statement "Causes serious eye irritation" from some company reports, and records the substance as not combustible.
ghs:
- H319
source: pubchem-calcium-silicate
where: 'Safety and Hazards: GHS Classification and Fire Hazards (CID 73415800)'
failure_risks:
- mode: Shrinkage under long heating
trigger: 12 hours at 500 °C
consequence: Linear shrinkage of 0.25 % as printed. This may open gaps at joints in a lined furnace; that effect is an inference from the printed figure, not a statement in the datasheet.
severity: low
source: promat-promatect-l
where: Technical data table, Shrinkage row
- mode: Breakage under bending load
trigger: Bending load on the board
consequence: The datasheet prints bending strength of 3.1 N/mm2 and cold compressive strength of 2.4 N/mm2, and gives no safe working load. Design checks are needed before any load-bearing use.
severity: moderate
source: promat-promatect-l
where: Technical data table, Bending strength and Cold compressive strength rows
side_effects: []
handling:
- text: When cutting to size, observe the maximum workplace concentration values for inhalable dust and use dust extraction, as Promat recommends.
source: promat-promatect-l
where: Working and processing
- text: When fixing with screws, use slot holes, as the datasheet recommends.
source: promat-promatect-l
where: Working and processing
- text: PROMATECT-L can be machined with special processing machinery and suitable tools; Promat says precise machined parts can be made.
source: promat-promatect-l
where: Working and processing
mitigations:
- text: Use dust extraction at cutting points, as Promat recommends for cutting to size.
source: promat-promatect-l
where: Working and processing, cutting paragraph
uses:
- application: thermal-control
device: Dryers and industrial furnaces (heavy industry)
example: Promat lists heat protection, dryers and industrial furnaces under heavy industry as application areas for PROMATECT-L boards.
source: promat-promatect-l
where: Application areas, Heavy industry list
- application: thermal-control
device: Ventilation and air conditioning equipment (OEM)
example: Promat lists ventilation and air conditioning technology, with apparatus construction, under OEM application areas.
source: promat-promatect-l
where: Application areas, OEM list
- application: structures
device: Load-bearing pipe columns (oil and gas)
example: Promat lists load-bearing pipe columns under oil and gas application areas.
source: promat-promatect-l
where: Application areas, Oil and gas list
supply:
- subject: Lime (calcium feedstock, quicklime and hydrated lime)
abundance: 'USGS: domestic and world resources of limestone and dolomite suitable for lime manufacture are very large.'
producers:
- country: China
share_percent: 73.8
year: 2025
- country: India
share_percent: 4
year: 2025
- country: United States
share_percent: 3.6
year: 2025
- country: Russia
share_percent: 2.9
year: 2025
critical_lists:
- list: 'USGS 2025 final list of critical minerals: lime not listed'
listed: false
- list: 'EU critical raw materials list: lime and calcium not listed'
listed: false
recycling: 'USGS lime chapter: large quantities of lime are regenerated by paper mills, and some water-treatment plants regenerate lime from softening sludge.'
substitutes:
- 'USGS: limestone is a substitute for lime in many applications but reacts more slowly. Cement and fly ash are potential substitutes for some construction uses of lime; no substitute for lime in calcium silicate board is named.'
source: usgs-mcs2026-lime
where: World Lime Production and Limestone Reserves table, 2025e column. Shares are computed by Space Mushroom from each country's printed tonnage over the printed world total of 420,000 thousand t (rounded). Substitutes and Recycling sections.
- subject: Silicon (silica feedstock, from quartzite)
abundance: 'USGS: world and domestic resources for making silicon metal and alloys are abundant; the source of the silicon is silica in various natural forms, such as quartzite.'
producers:
- country: China
share_percent: 87
year: 2025
- country: Brazil
share_percent: 3.9
year: 2025
- country: Norway
share_percent: 2.8
year: 2025
- country: Russia
share_percent: 0.8
year: 2025
critical_lists:
- list: 'USGS 2025 final list of critical minerals: silicon listed'
listed: true
- list: 'EU critical raw materials list: silicon metal listed'
listed: true
recycling: 'USGS silicon chapter: recycling is insignificant.'
substitutes:
- 'USGS: aluminum, silicon carbide and silicomanganese can substitute for ferrosilicon in some applications; no substitute for silica in calcium silicate board is named.'
source: usgs-mcs2026-silicon
where: World Production table, silicon metal, 2025 column. Shares are computed by Space Mushroom from each country's printed tonnage over the printed world total of 4,600 thousand t, silicon content (rounded). This is a proxy for silica supply, not a silica sand table. World Resources, Recycling and Substitutes sections.
documents:
- title: PROMATECT-L Technical Data Sheet, calcium silicate boards (Promat, 2017-09)
type: datasheet
url: https://media.promat.com/doc_682553_us/original/1850243040/promat-data-sheet--promatect-l-en-us.pdf?market=us
year: 2017
- title: CalSilBoard technology and technical data page (Qingdao Henry Cal Sil New Materials Co., Ltd.)
type: datasheet
url: https://www.calsilboard.com/technology.html
year: 2025
- title: 'PubChem: Calcium Silicate (CID 73415800), GHS classification summary'
type: database
url: https://pubchem.ncbi.nlm.nih.gov/compound/73415800
year: 2026
- title: 'Mineral Commodity Summaries 2026: Lime (USGS)'
type: report
url: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-lime.pdf
year: 2026
- title: 'Mineral Commodity Summaries 2026: Silicon (USGS)'
type: report
url: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-silicon.pdf
year: 2026
gaps:
- Promat does not print a composition for PROMATECT-L. The recipe describes calcium silicate board as CalSilBoard describes its own boards, and no PROMATECT-L composition value is recorded.
- No continuous service temperature is printed for PROMATECT-L; the classification temperature is the only temperature limit in the datasheet.
- Reversible thermal expansion is printed with an exponent, so it is left out, per the rule for exponent values.
- Typical air-dry moisture content is printed with a comma decimal, which the value check cannot match, so it is left out.
- Neither the compressive nor the bending test standard is named in the datasheet, so the test method for those two values is unknown.
- Thermal conductivity is recorded only at 20, 200 and 400 °C as printed in the table; the datasheet graph is not used as a value.
- Classification temperature, linear shrinkage, compressive strength, water vapour diffusion value, alkalinity and production tolerances are not in spores/property-canon.yaml; short snake_case names are used for them.
- No test report for the DIN or EN fire classes of this grade was found; the fire class is the datasheet statement only.
- Moisture resistance is a datasheet claim only; no moisture test, humidity exposure or ageing data for PROMATECT-L were found.
- No PROMATECT-L safety data sheet was read. The hazard entries use the datasheet's dust advice and PubChem's generic calcium silicate record, which is not this board.
- Feedstock shares are for lime and silicon metal as a whole; no producer share for calcium silicate board was found.
- No open-access paper on PROMATECT-L or on autoclaved xonotlite board properties was found in this run; an index search returned only an abstract that could not be opened, so it is not used.
- No space flight, vacuum, radiation or thermal-vacuum result for calcium silicate board was found; the profile holds ground datasheet values only.
- Other calcium silicate grades (CalSilBoard grades, Promatect-H, Promatect-MST, and the Monalite and Marinite lines) are not recorded here; each grade has its own datasheet.
sources:
promat-promatect-l:
title: PROMATECT-L Technical Data Sheet, calcium silicate boards
id: Promat data sheet, 2017-09 (copyright Etex NV)
url: https://media.promat.com/doc_682553_us/original/1850243040/promat-data-sheet--promatect-l-en-us.pdf?market=us
year: 2017
kind: datasheet
license: manufacturer datasheet, linked not reproduced
calsilboard-technology:
title: Calcium Silicate Board Technology and Technical Data (Qingdao Henry Cal Sil New Materials Co., Ltd.)
id: CalSilBoard website, page technology (copyright 2025)
url: https://www.calsilboard.com/technology.html
year: 2025
kind: web
license: manufacturer web page, linked not reproduced
hi-tempfab-calcium-silicate:
title: Calcium Silicate Insulation Boards (Hi-Temp Fabrication, distributor)
id: Hi-Temp Fabrication page calcium-silicate-boards
url: https://hi-tempfab.com/materials/calcium-silicate-boards
kind: web
license: distributor web page, linked not reproduced
usgs-mcs2026-lime:
title: Mineral Commodity Summaries 2026, Lime
id: USGS MCS 2026, February 2026
url: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-lime.pdf
year: 2026
kind: report
license: public domain (USGS)
usgs-mcs2026-silicon:
title: Mineral Commodity Summaries 2026, Silicon
id: USGS MCS 2026, February 2026
url: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-silicon.pdf
year: 2026
kind: report
license: public domain (USGS)
usgs-crit2025:
title: About the 2025 List of Critical Minerals (USGS)
id: USGS final 2025 List of Critical Minerals
url: https://www.usgs.gov/programs/mineral-resources-program/science/about-2025-list-critical-minerals
year: 2025
kind: web
license: public domain (USGS)
ec-crm:
title: Critical raw materials (European Commission)
id: Regulation (EU) 2024/1252 as shown on the European Commission page
url: https://single-market-economy.ec.europa.eu/sectors/raw-materials/areas-specific-interest/critical-raw-materials_en
year: 2024
kind: web
license: European Commission web page
pubchem-calcium-silicate:
title: PubChem compound record, Calcium Silicate (CID 73415800)
id: CID 73415800; generic calcium silicate record
url: https://pubchem.ncbi.nlm.nih.gov/compound/73415800
year: 2026
kind: database
license: public domain (NCBI)
license: CC-BY-4.0
updated: '2026-11-01'
review:
status: draft
method: assistant
checked_values: 16
unreachable: 0
caveats: 4
note: Written 2026-11-01 from the Promat PROMATECT-L datasheet (read as PDF text), the CalSilBoard and Hi-Temp Fabrication pages, USGS Mineral Commodity Summaries 2026, PubChem, and the USGS and European Commission critical-mineral lists. Values taken from the Promat datasheet are as printed.
story:
recipe:
line: Calcium silicate board is a rigid insulation board made from siliceous and calcareous raw materials with reinforcing fibres. CalSilBoard says its boards are mixed, formed as a slurry and autoclaved under high pressure to grow a xonotlite crystal structure. Promat does not print the composition of PROMATECT-L, so the parts below describe the general process, not a measured recipe.
parts:
- name: Calcium silicate (xonotlite) matrix
symbol: xonotlite
role: The crystalline matrix formed in the autoclave; it gives the board its strength and low conductivity.
share_note: not printed for PROMATECT-L
source: calsilboard-technology
where: What Is Calcium Silicate Board
- name: Siliceous raw material
role: Silica source for the autoclaved calcium silicate phase.
share_note: not printed for PROMATECT-L
source: calsilboard-technology
where: How Calcium Silicate Board Is Made
- name: Calcareous raw material
role: Lime source for the calcium silicate phase.
share_note: not printed for PROMATECT-L
source: calsilboard-technology
where: How Calcium Silicate Board Is Made
- name: Reinforcing fibres
role: Add strength to the board.
share_note: not printed for PROMATECT-L
source: calsilboard-technology
where: How Calcium Silicate Board Is Made
risk_groups:
- title: For people
level: 1
verdict: Dust when cutting needs extraction
lead: Promat's datasheet gives no hazard classification for PROMATECT-L. Cutting it makes dust, which Promat says must be controlled.
points:
- label: Dust
line: Promat says to observe the maximum workplace concentration values for inhalable dust when cutting, and recommends dust extraction.
- label: Eye contact
line: PubChem's record for generic calcium silicate, which is not this board, lists the hazard statement "Causes serious eye irritation" from some company reports.
- label: Fire
line: Promat gives the board a building material class of A1, non-combustible, under the German DIN standard. PubChem's generic record also says calcium silicate is not combustible.
- title: If it overheats
lead: Heat is the main test for this board. It shrinks slightly after long heating, and the datasheet gives a classification temperature, not a service limit.
points:
- label: Shrinkage
line: Promat prints a shrinkage of 0.25 % after 12 hours at 500 °C.
- label: Limit
line: The 500 °C figure is a classification temperature. The datasheet prints no continuous service temperature for PROMATECT-L.
why: 'Calcium silicate board is a lightweight, rigid insulation board. Promat''s PROMATECT-L datasheet gives a classification temperature of 500 °C, a bulk density of 450 kg/m3 and a thermal conductivity of 0.08 W/m K at 20 °C. Those figures explain where the board is chosen: dryers, industrial furnaces and ventilation equipment, where it both insulates and holds its shape. The datasheet classification is not a continuous service limit.'
uses:
- where: Dryers and industrial furnaces
line: Promat lists dryers and industrial furnaces, under heavy industry, as application areas for PROMATECT-L.
- where: Ventilation and air conditioning equipment
line: Promat lists ventilation and air conditioning technology, with apparatus construction, under OEM application areas.
- where: Load-bearing pipe columns, oil and gas
line: Promat lists load-bearing pipe columns under oil and gas. The datasheet gives a bending strength of 3.1 N/mm2, so any structural use needs a load check.
can_do:
- label: Insulation at 20 °C
value: 0.08 W/m K at 20 °C
line: Promat prints a thermal conductivity of 0.08 W/m K at 20 °C. It rises to 0.11 W/m K at 400 °C, the highest temperature in the table.
- label: Classification temperature
value: 500 °C
line: Promat classifies the board to 500 °C. This is not a continuous service temperature, and the datasheet gives none.
- label: Strength
value: 2.4 N/mm2 cold compressive
line: The cold compressive strength is 2.4 N/mm2 and the bending strength is 3.1 N/mm2. The datasheet names no test standard for either.
- label: Board size
value: 1200 mm wide
line: Promat delivers the board 1200 mm wide, in lengths of 2500 or 3000 mm and thicknesses of 20 to 50 mm.
compare: Promat rates PROMATECT-L at 500 °C as a classification temperature and gives no continuous service temperature, so that figure should not be set against the continuous-use limits of other insulation materials. CalSilBoard, a Chinese maker of calcium silicate board, lists separate maximum and continuous service temperatures for its own grades, so the two datasheets use different limits and must be read with each one's definition. Unlike a fibre blanket, the board is rigid and can be machined, as the Promat datasheet describes.
compare_rows:
- label: Classification temperature
benchmark: classification_temperature
- label: Bulk density
benchmark: density
- label: Thermal conductivity at 20 °C
benchmark: thermal_conductivity
handling:
- 'Cut with dust control: observe the workplace limit for inhalable dust and use dust extraction, as Promat recommends.'
- Fix with screws through slot holes, as Promat recommends when screws are used.
- Machine with suitable tools. Promat says precise machined parts can be made from the board.
good_for:
- Dryers and industrial furnaces, where Promat gives a 500 °C classification and a 0.08 W/m K conductivity at 20 °C.
- Ventilation and air conditioning equipment, which Promat lists as an OEM application area.
watch_out:
- The 500 °C figure is a classification temperature. No continuous service temperature is printed for PROMATECT-L.
- Cutting makes dust. Use extraction and observe the inhalable dust limit.
- A bending strength of 3.1 N/mm2 is low for load-bearing use without a design check.
- No space flight, vacuum or radiation data for calcium silicate board were found in the sources we hold.
verdict: Promatect-L is a calcium silicate board with datasheet values for temperature, density and conductivity. It has no space flight data, and the datasheet prints no continuous service temperature.
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 |
|---|---|---|---|---|
| PROMATECT-L Technical Data Sheet, calcium silicate boards | datasheet | 2017 | 30 values | |
| Calcium Silicate Board Technology and Technical Data (Qingdao Henry Cal Sil New Materials Co., Ltd.) | web | 2025 | 0 values | |
| Calcium Silicate Insulation Boards (Hi-Temp Fabrication, distributor) | web | 0 values | ||
| Mineral Commodity Summaries 2026, Lime | report | 2026 | 1 value | |
| Mineral Commodity Summaries 2026, Silicon | report | 2026 | 1 value | |
| About the 2025 List of Critical Minerals (USGS) | web | 2025 | 0 values | |
| Critical raw materials (European Commission) | web | 2024 | 0 values | |
| PubChem compound record, Calcium Silicate (CID 73415800) | database | 2026 | 1 value |
Updated