Loctite Stycast 2850FT thermally conductive epoxy encapsulant STYCAST 2850FT

spore: profile
id: stycast-2850ft
spore_version: 0.2
family: epoxy-encapsulants
name: Loctite Stycast 2850FT thermally conductive epoxy encapsulant
abbreviation: STYCAST 2850FT
role: thermally conductive potting and encapsulation compound
category: electronics
type: dielectrics-and-capacitors
summary: Loctite Stycast 2850FT is a two-part, thermally conductive epoxy encapsulant for potting electronics. With LOCTITE CAT 9 curing agent, the cured material has a thermal conductivity of 1.25 W/(m-K) and a dielectric strength of 14.4 kV/mm, as printed in the Henkel technical data sheet (December 2024). The same sheet gives a glass transition temperature of 86 °C, an operating range of -40 to 130 °C and a working life of 45 minutes for 100 g at 25 °C for the CAT 9 system. Henkel recommends it for encapsulating components that need heat dissipation and thermal shock resistance.
best_for: 'Potting electronics that must shed heat and survive thermal shock: 1.25 W/(m-K) thermal conductivity and 14.4 kV/mm dielectric strength with CAT 9'
weakest_at: Short working life (45 minutes at 25 °C for 100 g with CAT 9) and a glass transition temperature of 86 °C, below the 130 °C upper service limit
identity:
  formula: 'Two-part epoxy: an epoxy resin (Part A) and LOCTITE CAT 9 curing agent (Part B). The TDS prints only the technology ''Epoxy'' and does not name the resin, filler or full composition.'
  source: henkel-tds
  where: Product description table, Technology row; Mix ratio rows for CAT 9
tags:
  environments: []
  applications:
    - electronics-and-chips
    - thermal-control
properties:
  - benchmark: thermal_conductivity
    label: Thermal conductivity, cured
    value: 1.25
    unit: W/(m-K)
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      state: cured material, typical value as printed
    method: Typical value printed by Henkel for the cured material with CAT 9. Ellsworth's product page prints the same 1.25 W/mK for Catalyst 9. Unit kept as printed, W/(m-K).
    status: ground
    source: henkel-tds
    where: Typical properties of cured material, LOCTITE STYCAST 2850FT with LOCTITE CAT 9 block, after the glass transition row
  - benchmark: dielectric_strength
    label: Dielectric strength, cured
    value: 14.4
    unit: kV/mm
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      state: cured material, typical value as printed
    method: Typical value printed by Henkel. Ellsworth's product page prints 14.4 kV/mm for Catalyst 9.
    status: ground
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Electrical properties
  - benchmark: dielectric_constant
    label: Dielectric constant at 1 MHz, cured
    value: 5.01
    unit: '-'
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      frequency: 1 MHz
    method: Printed as 5.01/0.028 (dielectric constant / dissipation factor at 1 MHz) in the CAT 9 block.
    status: ground
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Electrical properties
  - benchmark: dissipation_factor
    label: Dissipation factor at 1 MHz, cured
    value: 0.028
    unit: '-'
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      frequency: 1 MHz
    method: Printed as 5.01/0.028 (dielectric constant / dissipation factor at 1 MHz) in the CAT 9 block.
    status: ground
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Electrical properties
  - benchmark: glass_transition_temperature
    label: Glass transition temperature, cured
    value: 86
    unit: °C
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      state: cured material
    method: Printed in the CAT 9 block. The TDS does not name the test method.
    status: ground
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Physical properties
  - benchmark: cte
    label: Coefficient of thermal expansion below Tg
    value: 35
    unit: ppm
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      region: pre Tg (below the glass transition)
    method: TDS prints 'ppm' with no per-kelvin unit; kept as printed and not converted. Test method not named.
    status: ground
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Coefficient of thermal expansion, Pre Tg
  - benchmark: cte_post_tg
    label: Coefficient of thermal expansion above Tg
    value: 98.9
    unit: ppm
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      region: post Tg (above the glass transition)
    method: TDS prints 'ppm' with no per-kelvin unit; kept as printed. Non-canonical benchmark name, listed in gaps.
    status: ground
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Coefficient of thermal expansion, Post Tg
  - benchmark: moisture_absorption
    label: Water absorption, 24 hour immersion
    value: 0.03
    unit: '%'
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      immersion: 24 hours
    method: Printed as 'Water absorption, (24 hr immersion), %' in the CAT 9 block. Canonical name moisture_absorption (alias water_absorption).
    status: ground
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Physical properties
  - benchmark: linear_shrinkage
    label: Linear shrinkage on cure
    value: 0.2
    unit: '%'
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      state: cured material
    method: Printed in the CAT 9 block. Non-canonical benchmark name, listed in gaps.
    status: ground
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Physical properties
  - benchmark: hardness_shore_d
    label: Hardness, Shore D
    value: 96
    unit: Shore D
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      state: cured material
    method: Printed as 'Hardness, Shore D 96' in the CAT 9 block. Non-canonical benchmark name, listed in gaps.
    status: ground
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Physical properties
  - benchmark: flexural_strength
    label: Flexural strength, cured
    value: 92
    unit: N/mm²
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      state: cured as mixed, typical value
    method: Printed as 92 N/mm² (13,300 psi) in the cured performance table. Unit kept as printed.
    status: ground
    source: henkel-tds
    where: Typical cured performance as mixed table, LOCTITE STYCAST 2850FT with LOCTITE CAT 9 row, Flexural strength
  - benchmark: compressive_strength
    label: Compressive strength, cured
    value: 155
    unit: N/mm²
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      state: cured as mixed, typical value
    method: Printed as 155 N/mm² (22,500 psi) in the cured performance table. Non-canonical benchmark name, listed in gaps.
    status: ground
    source: henkel-tds
    where: Typical cured performance as mixed table, LOCTITE STYCAST 2850FT with LOCTITE CAT 9 row, Compressive strength
  - benchmark: min_service_temp
    label: Minimum operating temperature
    value: -40
    unit: °C
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      type: operating temperature, as printed
    method: Printed as 'Operating temperature, °C -40 to 130' in the CAT 9 product characteristics. The TDS does not say whether this is continuous or intermittent.
    status: ground
    source: henkel-tds
    where: Product description, CAT 9 product characteristics, Operating temperature row
  - benchmark: max_service_temp
    label: Maximum operating temperature
    value: 130
    unit: °C
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      type: operating temperature, as printed
    method: Printed as 'Operating temperature, °C -40 to 130' in the CAT 9 product characteristics. The TDS does not say whether this is continuous or intermittent.
    status: ground
    source: henkel-tds
    where: Product description, CAT 9 product characteristics, Operating temperature row
  - benchmark: density
    label: Density as mixed, uncured
    value: 2.29
    unit: g/cm3
    scope: material
    conditions:
      state: uncured, as mixed with CAT 9
      temperature: not printed in the table
    method: Printed in the 'Typical uncured properties as mixed' table for the CAT 9 row.
    status: ground
    source: henkel-tds
    where: Typical uncured properties as mixed table, LOCTITE STYCAST 2850FT with CAT 9 row
  - benchmark: viscosity_as_mixed
    label: Viscosity as mixed, uncured
    value: 58000
    unit: mPa.s
    scope: material
    conditions:
      state: uncured, as mixed with CAT 9
      temperature: 25 °C
    method: Printed as 58,000 mPa·s at 25 °C in the 'Typical uncured properties as mixed' table. Non-canonical benchmark name, listed in gaps.
    status: ground
    source: henkel-tds
    where: Typical uncured properties as mixed table, LOCTITE STYCAST 2850FT with CAT 9 row
  - benchmark: working_life
    label: Working life, 100 g mass
    value: 45
    unit: min
    scope: material
    conditions:
      state: uncured, as mixed with CAT 9
      mass: 100 g
      temperature: 25 °C
    method: Printed as 45 minutes (100 gram mass at 25 °C). Non-canonical benchmark name, listed in gaps.
    status: ground
    source: henkel-tds
    where: Typical uncured properties as mixed table, LOCTITE STYCAST 2850FT with CAT 9 row, Work life column
  - benchmark: shelf_life
    label: Shelf life, unopened
    value: 365
    unit: days
    scope: material
    conditions:
      storage: 18 to 25 °C
      basis: from date of manufacture
    method: Printed in the uncured-material table. Non-canonical benchmark name, listed in gaps.
    status: ground
    source: henkel-tds
    where: Typical properties of uncured material table, Shelf life row
  - benchmark: total_mass_loss
    label: Total mass loss, outgassing
    value: 0.25
    unit: '%'
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      cure: 24 hours at 25 °C
      test: outgassing per NASA Reference Publication 1124, as stated in the TDS
    method: Printed as TML 0.25 % in the CAT 9 block. Non-canonical benchmark name, listed in gaps.
    status: ground
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Outgassing properties
  - benchmark: cvcm
    label: Collected volatile condensable material
    value: 0.01
    unit: '%'
    scope: material
    conditions:
      catalyst: LOCTITE CAT 9
      cure: 24 hours at 25 °C
      test: outgassing per NASA Reference Publication 1124, as stated in the TDS
    method: Printed as CVCM 0.01 % in the CAT 9 block. Non-canonical benchmark name, listed in gaps.
    status: ground
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Outgassing properties
supply:
  - subject: Bisphenol A (feedstock for epoxy resins)
    demand: Global production in 2022 was estimated to be in the region of 10 million tonnes (Wikipedia, Bisphenol A). About 25–30% of all BPA is used in the manufacture of epoxy resins and vinyl ester resins; the article gives no year for that share.
    producers: []
    critical_lists: []
    substitutes: []
    source: wiki-bpa
    where: Article text as fetched (production sentence; epoxy share sentence). The article names no producing companies or countries.
  - subject: Epichlorohydrin (feedstock for epoxy resins)
    demand: More than 800,000 tons (1997) of epichlorohydrin are produced annually (Wikipedia, Epichlorohydrin). Epichlorohydrin is mainly converted to bisphenol A diglycidyl ether, a building block in the manufacture of epoxy resins.
    producers: []
    critical_lists: []
    substitutes: []
    source: wiki-ech
    where: Article text as fetched (production sentence, 1997; use sentence). The article names no producing companies or countries.
corrosion:
  - environment: Water immersion, 24 hours
    headline: Cured CAT 9 material absorbs 0.03 % water after 24 hours of immersion.
    effect: The TDS prints water absorption of 0.03 % after a 24 hour immersion for the CAT 9 system. The TDS gives no longer immersion results for this system, and it lists the CAT 11 system at 0.05 %, so the CAT 9 value should not be read as a long-term figure.
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Physical properties; CAT 11 block for comparison
    rating: unknown
  - environment: Chemical exposure
    headline: The TDS describes the CAT 9 system as having good chemical resistance, with no numbers.
    effect: The CAT 9 product characteristics list 'Good chemical resistance' and 'Good physical strength'. The TDS gives no test, medium or duration, so no chemical compatibility list can be drawn from it.
    source: henkel-tds
    where: Product description, LOCTITE CAT 9 product characteristics
    rating: unknown
  - environment: Vacuum exposure after cure
    headline: Cured CAT 9 material releases 0.25 % total mass loss and 0.01 % CVCM under the NASA outgassing test printed in the TDS.
    effect: The TDS prints TML 0.25 % and CVCM 0.01 % for the CAT 9 system cured 24 hours at 25 °C, per NASA Reference Publication 1124. Outgassing is the release of trapped or absorbed gas from a material, and NASA and ESA keep lists of low-outgassing materials because released gases can condense on optics, thermal radiators and solar cells (Wikipedia, Outgassing).
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Outgassing properties
    rating: unknown
uses:
  - application: electronics-and-chips
    device: Encapsulated electronic components
    example: Henkel recommends STYCAST 2850FT for encapsulation of components that require heat dissipation and thermal shock properties.
    source: henkel-tds
    where: Product description, Typical assembly applications
  - application: thermal-control
    device: Potted assemblies that must move heat out of the encapsulated part
    example: The TDS gives 1.25 W/(m-K) thermal conductivity for the cured CAT 9 system, the figure to use when a potted part must move heat away.
    source: henkel-tds
    where: Typical properties of cured material, CAT 9 block, Physical properties
risks:
  hazards:
    - text: 'PubChem''s record for bisphenol A diglycidyl ether (BADGE, CID 2286) lists EU CLP hazard statements H315 (Causes skin irritation), H317 (May cause an allergic skin reaction) and H319 (Causes serious eye irritation), with signal word Warning. ECHA notifications also list H411 (Toxic to aquatic life with long lasting effects) at 50.9%. This is a component-class record, not the STYCAST 2850FT product: the TDS does not say whether the product contains BADGE.'
      ghs: []
      source: pubchem-badge
      where: Safety and Hazards, GHS Classification (CID 2286)
    - text: The TDS refers all safe-handling information to the Safety Data Sheet and prints flash point only as 'see SDS'. The product's own SDS was not read in this run, so no product GHS classification is given.
      ghs: []
      source: henkel-tds
      where: General information, and Typical properties of uncured material (flash point row)
  failure_risks:
    - mode: Solder-joint fatigue under temperature cycling
      trigger: Rigid encapsulant held across a wide temperature range
      consequence: Wikipedia says compounds with high glass transition temperatures can break solder bonds through solder fatigue, because they shrink as rigid solids across a wider temperature range. The CAT 9 system has a glass transition of 86 °C with CTE of 35.0 ppm below and 98.9 ppm above Tg, per the TDS. The sources read give no threshold for what counts as a high Tg, so the risk is not quantified.
      severity: moderate
      source: henkel-tds
      where: Typical properties of cured material, CAT 9 block; Wikipedia Potting (Electronics) for the solder fatigue statement
    - mode: Outgassing contamination in vacuum
      trigger: Use in vacuum after cure
      consequence: The CAT 9 system releases 0.25 % total mass loss and 0.01 % CVCM under the NASA test printed in the TDS. Released gases can condense on optics, thermal radiators or solar cells (Wikipedia, Outgassing).
      severity: low
      source: henkel-tds
      where: Typical properties of cured material, CAT 9 block, Outgassing properties
  side_effects:
    - text: Epoxy curing is exothermic, so heat from the reaction can be a concern (Wikipedia, Epoxy).
      affects: Heat build-up in the mixed batch and in the potted assembly
      source: wiki-epoxy
      where: Epoxy curing and hardener discussion (page as fetched)
    - text: Gentle warming lowers the viscosity but shortens the pot life (TDS directions for use).
      affects: Working time of the mixed batch
      source: henkel-tds
      where: Directions for use, item 13
  handling:
    - text: Mix by weight 100:3.5 (resin to CAT 9) or by volume 100:8.5. Blend by hand for 2 to 3 minutes, scraping the sides, then power mix for a further 2 to 3 minutes. Vacuum deair at 1 to 5 mm mercury until bubbling stops, usually 3 to 10 minutes.
      source: henkel-tds
      where: Product description mix ratio rows; Directions for use, items 6 to 11
    - text: 'CAT 9 cure schedules printed: 16 to 24 hours at 25 °C, 4 to 6 hours at 45 °C, or 1 to 2 hours at 65 °C. The TDS advises a post cure of 2 to 4 hours at the highest expected use temperature for optimum performance.'
      source: henkel-tds
      where: Typical curing performance, LOCTITE STYCAST 2850FT with LOCTITE CAT 9
    - text: If the resin or hardener has crystallized, warm the shipping container to 50 to 60 °C until the crystals dissolve, and loosely cover it while warming. Some separation is common in shipping and storage, so mix thoroughly before use.
      source: henkel-tds
      where: Directions for use, items 1 and 4
    - text: Store unopened in a dry location at 18 to 25 °C. Material removed from its container may be contaminated, and should not be returned to the original container.
      source: henkel-tds
      where: Storage section
  mitigations:
    - text: Vacuum deair the mixed batch to remove entrapped air for a void-free embedment (TDS directions 9 to 11), and clean substrates to remove oxide, dust, moisture, salt and oils, which cause poor adhesion or corrosion in a bonded part (TDS direction 3).
      source: henkel-tds
      where: Directions for use, items 3, 9 to 11
story:
  recipe:
    line: Loctite STYCAST 2850FT is a two-part epoxy. Part A is the resin, which the TDS prints as black (Ellsworth's product page calls the blue 60 lb pail product blue). Part B is LOCTITE CAT 9 curing agent, which cures the resin into a crosslinked network. The TDS names only the technology (epoxy) and does not print the resin chemistry, filler or full composition.
    parts:
      - name: Epoxy resin (Part A)
        share: 100 parts by weight
        role: The base resin. The TDS prints the mix ratio as 100:3.5 by weight against CAT 9, so the resin is the reference part of the mix.
      - name: LOCTITE CAT 9 curing agent (Part B)
        share: 3.5 parts by weight per 100 parts resin
        role: Reacts with the resin to form the cured network. Printed as 100:3.5 by weight and 100:8.5 by volume; the TDS gives CAT 9 a cure at 16 to 24 hours at 25 °C.
  risk_groups:
    - title: For people
      level: 1
      verdict: Product hazard data not read
      lead: The product SDS was not reachable in this run. The only GHS data read are for bisphenol A diglycidyl ether, a common epoxy resin, which is a component-class record and not a product classification.
      points:
        - label: The product
          line: The TDS sends all safe-handling information to the Safety Data Sheet and prints the flash point only as 'see SDS'.
        - label: Epoxy resin class
          line: PubChem's record for BADGE (CID 2286) lists H315, H317 and H319 with the signal word Warning, and H411 from ECHA notifications at 50.9%.
        - label: Mixing
          line: Mixing and degassing take several minutes of hand work and vacuum. Keep the mixed batch under control, because the cure is exothermic.
    - title: In service
      level: 0
      verdict: Outgassing is the only in-service value printed
      lead: The TDS gives no in-service hazard statement for the cured material. Its only printed space-relevant number is the outgassing result.
      points:
        - label: Outgassing
          line: TML 0.25 % and CVCM 0.01 % for the CAT 9 system cured 24 hours at 25 °C, under the NASA Reference Publication 1124 test printed in the TDS.
  why: Loctite STYCAST 2850FT is an epoxy encapsulant made to pot electronics that must shed heat and survive thermal shock. The TDS prints a thermal conductivity of 1.25 W/(m-K) and a dielectric strength of 14.4 kV/mm for the cured CAT 9 system. Henkel recommends it for components that need heat dissipation and thermal shock properties, and describes it as having low CTE, printed as 35.0 ppm below the glass transition.
  uses:
    - where: Potting and encapsulating electronic components
      line: Henkel recommends the product for encapsulating components that need heat dissipation and thermal shock properties. Wikipedia (Potting, electronics) describes potting as filling an assembly with a solid or gelatinous compound to keep out water, moisture and corrosive agents and to improve resistance to shock and vibration.
    - where: Potting for heat removal
      line: The TDS prints the cured CAT 9 thermal conductivity as 1.25 W/(m-K). That is the figure that matters when the encapsulant must carry heat away from the potted part.
  can_do:
    - label: Thermal conductivity
      benchmark: thermal_conductivity
      value: 1.25 W/(m-K)
      line: The TDS prints 1.25 W/(m-K) for the cured CAT 9 system. Ellsworth prints the same 1.25 W/mK for Catalyst 9. The other catalysts in the same TDS print higher or lower values, listed in the gaps.
    - label: Dielectric strength
      benchmark: dielectric_strength
      value: 14.4 kV/mm
      line: The TDS prints 14.4 kV/mm for the cured CAT 9 system, and a dielectric constant of 5.01 at 1 MHz. Ellsworth prints the same 14.4 kV/mm for Catalyst 9.
    - label: Glass transition
      benchmark: glass_transition_temperature
      value: 86 °C
      line: The cured CAT 9 system has a glass transition of 86 °C. Its service range is -40 to 130 °C, so the upper service limit is above the glass transition.
    - label: Working life
      benchmark: working_life
      value: 45 min
      line: The mixed CAT 9 batch has a working life of 45 minutes for a 100 g mass at 25 °C, printed in the TDS. The TDS also says gentle warming shortens the pot life, so warming the mix to speed flow costs working time.
  compare: 'Within the STYCAST 2850FT family, the TDS prints a different thermal conductivity for each catalyst: CAT 9 is 1.25 W/(m-K), CAT 11 is 1.28 W/(m-K), CAT 23LV is 1.1 W/(m-K) and CAT 24LV is 1.01 W/(m-K). CAT 9 has the second-highest printed thermal conductivity of the four, and the lowest printed dielectric strength of the three that print one (14.4 kV/mm, against 14.8 kV/mm for CAT 23LV and 15.0 kV/mm for CAT 11). Its service ceiling of 130 °C is below the 155 °C of CAT 11. No comparison values for other encapsulant families were read in this run, so this profile makes no ranking against them.'
  compare_rows:
    - label: Thermal conductivity (CAT 9)
      benchmark: thermal_conductivity
    - label: Dielectric strength (CAT 9)
      benchmark: dielectric_strength
    - label: Glass transition temperature (CAT 9)
      benchmark: glass_transition_temperature
  handling:
    - The mix is 100 parts resin to 3.5 parts CAT 9 by weight. Weigh accurately, blend and power mix, then vacuum deair at 1 to 5 mm mercury before pouring.
    - Store the unopened container dry at 18 to 25 °C. The shelf life is 365 days from manufacture.
    - Warm a crystallized container to 50 to 60 °C with the lid loose, and cool to room temperature before use.
    - Use the product's own SDS for hazard, handling and first-aid rules. Flash point is printed only as 'see SDS'.
  good_for:
    - Potting electronics that must move heat away and resist thermal shock. The TDS gives 1.25 W/(m-K) and the Henkel recommendation for heat dissipation and thermal shock.
    - Electrical insulation of potted parts, with a dielectric strength of 14.4 kV/mm for the cured CAT 9 system, as printed in the TDS.
  watch_out:
    - Short working life. The mixed CAT 9 batch lasts 45 minutes at 25 °C for 100 g.
    - Glass transition of 86 °C, below the 130 °C upper service limit, so the material is soft above that temperature.
    - 'Outgassing: 0.25 % total mass loss and 0.01 % CVCM under the printed NASA test, which matters for optics and thermal surfaces in vacuum.'
    - The product's hazard data is not read here. Consult the Safety Data Sheet before handling.
  verdict: STYCAST 2850FT is a practical, thermally conductive potting epoxy with printed electrical and thermal numbers for the CAT 9 system. It is a plain encapsulant with a short working life and a Tg of 86 °C, and its space relevance rests on one printed outgassing result. The gaps below list what this run could not confirm.
gaps:
  - Product SDS not read. Henkel's TDS sends all safe-handling information to it and prints flash point only as 'see SDS'. No product GHS classification is given; the H-codes listed are for bisphenol A diglycidyl ether, a component class.
  - Composition not printed. The TDS says only 'Epoxy'. Resin chemistry, filler type and loading and the full CAT 9 chemistry are not stated in any source read.
  - The brief's wording 'CTE-matched' is not supported by the sources read. The TDS says 'Low CTE' and prints 35.0 ppm below Tg and 98.9 ppm above Tg; no match to chip or board CTE was found.
  - Cryogenic and space-hardware use is not stated in any source read. The lowest CAT 9 operating temperature printed is -40 °C; CAT 11 prints -55 to 155 °C and CAT 23LV prints -65 to 105 °C.
  - Colour conflict. The TDS prints the resin appearance as Black and says an unpigmented version exists; Ellsworth's product page is titled and described as Blue. Not resolved.
  - 'Other catalyst systems from the same TDS, not used as profile values: CAT 11 thermal conductivity 1.28 W/(m-K), dielectric strength 15.0 kV/mm, service -55 to 155 °C; CAT 23LV thermal conductivity 1.1 W/(m-K), dielectric strength 14.8 kV/mm, service -65 to 105 °C; CAT 24LV thermal conductivity 1.01 W/(m-K), service -65 to 105 °C; CAT 27-1 continuous operating -40 to 175 °C.'
  - Density 2.4 g/cm3 is printed for the uncured material (and as specific gravity 2.4 on Ellsworth). Not used; the profile uses 2.29 g/cm3 as mixed with CAT 9.
  - 'Non-canonical benchmark names used because no canonical name fits: hardness_shore_d, linear_shrinkage, cte_post_tg, compressive_strength, viscosity_as_mixed, working_life, shelf_life, total_mass_loss, cvcm.'
  - 'Electrical resistivity: the TDS prints ''1×1015'' ohm-cm with the exponent as a superscript; read as 1 x 10^15, which matches Ellsworth''s ''>1 x 10^15 ohm-cm''.'
  - CTE unit printed as 'ppm' without per-kelvin; kept as printed. Test methods for Tg, CTE and hardness are not named in the TDS.
  - 'Ageing: no UV, humidity, hydrolysis or long-term heat-ageing data in any source read. Water absorption is given only for 24 hour immersion.'
  - 'Outgassing: only TML and CVCM from the TDS, cured 24 hours at 25 °C. No collected-condensate data or vacuum test beyond the printed NASA RP 1124 test was found.'
  - Specific heat, shelf life beyond the printed 365 days, and product-specific designations (UNS, CAS, EN) were not found. A mixture has no single CAS number.
  - No independent test data. All values are manufacturer typical values. Ellsworth corroborates the CAT 9 thermal conductivity and dielectric strength only.
  - Web search in the first run was unavailable. In the deepen run, search returned only commercial market reports, and no NASA NTRS, NIST or ESA page specific to this product was found.
  - 'Supply: no producer shares by country were found in a fetched, citable source for bisphenol A or epichlorohydrin. The supply entries give feedstock volumes from Wikipedia only. Commercial market-report figures seen in search snippets are not used.'
  - NASA Outgassing Database (etd.gsfc.nasa.gov/capabilities/outgassing-database/) was reached, but its search loads data in the browser and no STYCAST 2850FT record was read. The TML and CVCM values stay as printed by Henkel only.
  - 'Hazards: no SDS or PubChem GHS record for the product or for epichlorohydrin was read. PubChem returned a verification page in this run. The Wikipedia epichlorohydrin article prints H226, H301, H311, H314, H317, H331 and H350 (signal word Danger), but it is not a safety data sheet, so these codes are not added to the profile.'
sources:
  henkel-tds:
    title: LOCTITE STYCAST 2850FT Technical Data Sheet (Henkel, December 2024)
    id: Henkel, LOCTITE STYCAST 2850FT TDS
    url: https://datasheets.tdx.henkel.com/LOCTITE-STYCAST-2850FT-en_GL.pdf
    year: 2024
    kind: datasheet
    license: Henkel TDS, cited, not reproduced
  ellsworth-stycast:
    title: Henkel Loctite Stycast 2850FT Thermally Conductive Encapsulant, Blue, 60 lb Pail (Ellsworth product page)
    id: Ellsworth Industrial product page
    url: https://www.ellsworth.com/products/by-market/power/thermally-conductive-materials/encapsulants/henkel-loctite-stycast-2850ft-thermally-conductive-encapsulant-blue-60-lb-pail/
    kind: web
    license: Reseller page, cited
  pubchem-badge:
    title: PubChem CID 2286, Bisphenol A diglycidyl ether (GHS classification)
    id: PubChem CID 2286
    url: https://pubchem.ncbi.nlm.nih.gov/compound/2286
    kind: database
    license: PubChem, public domain
  wiki-epoxy:
    title: Epoxy (Wikipedia)
    id: Wikipedia, Epoxy
    url: https://en.wikipedia.org/wiki/Epoxy
    kind: web
    license: CC BY-SA 4.0, cited
  wiki-outgassing:
    title: Outgassing (Wikipedia)
    id: Wikipedia, Outgassing
    url: https://en.wikipedia.org/wiki/Outgassing
    kind: web
    license: CC BY-SA 4.0, cited
  wiki-potting:
    title: Potting (electronics) (Wikipedia)
    id: Wikipedia, Potting (electronics)
    url: https://en.wikipedia.org/wiki/Potting_(electronics)
    kind: web
    license: CC BY-SA 4.0, cited
  wiki-bpa:
    title: Bisphenol A (Wikipedia)
    id: Wikipedia, Bisphenol A
    url: https://en.wikipedia.org/wiki/Bisphenol_A
    kind: web
    license: CC BY-SA 4.0, cited
  wiki-ech:
    title: Epichlorohydrin (Wikipedia)
    id: Wikipedia, Epichlorohydrin
    url: https://en.wikipedia.org/wiki/Epichlorohydrin
    kind: web
    license: CC BY-SA 4.0, cited
documents:
  - title: LOCTITE STYCAST 2850FT Technical Data Sheet (Henkel, December 2024)
    type: datasheet
    url: https://datasheets.tdx.henkel.com/LOCTITE-STYCAST-2850FT-en_GL.pdf
    year: 2024
  - title: PubChem CID 2286, Bisphenol A diglycidyl ether (GHS classification)
    type: database
    url: https://pubchem.ncbi.nlm.nih.gov/compound/2286
license: CC-BY-4.0
updated: '2026-11-01'
review:
  status: draft
  method: assistant
  checked_values: 20
  unreachable: 1
  caveats: 2
  note: Written by an assistant on 2026-11-01 from the Henkel TDS (December 2024), the Ellsworth product page, PubChem CID 2286 and three Wikipedia pages read in this run. The product SDS was not reachable. Deepen run on 2026-11-02 added two Wikipedia sources (Bisphenol A, Epichlorohydrin) and a feedstock supply section. verify-values on that run found 20 of 20 values in their cited sources, 0 NOT FOUND.