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BLUESIL ESA 7252 A
2K-Pt silicone with excellent flame resistance and good thermal conductivity — mixing ratio 1:1.
2K-Pt silicone with excellent flame resistance (UL 94 V0) and good thermal conductivity (0.42 W/m·K) for thermal and fire protection in aerospace potting
Documents
Internal reference:
49-7252A
HS code:
39100000
Bluesil ESA 7252 A & B is a 2K-Pt silicone with excellent flame resistance (UL 94 V0) and good thermal conductivity (0.42 W/m·K) for thermal and fire protection in aerospace potting.
This product line comprises 2K polyaddition silicone elastomers with exceptional flame resistance (UL 94 V0) and thermal conductivity for aerospace and fire protection applications. ESA 7252 is tailored to specific industrial applications—the key properties and areas of application are listed below.
Bluesil ESA 7252 is the fire-resistant specialist choice of the ESA series — excellent flame resistance (UL 94 V0) and good thermal conductivity (0.42 W/m·K). Ideal for encapsulation in aviation, junction boxes, and applications requiring thermal heat dissipation.
What distinguishes ESA 7252
What is ESA 7252 used for?
processing
Recommended accessories
Important instructions
ESA 7252 compared to related RTV products
Networking system, mechanics, and processing times side by side — all values from the official Elkem TDS. “— " = not specified in the datasheet.
ESA 7252 Current product |
RTV 8352 LV → | ESA 7250 → | V-695 → | |
|---|---|---|---|---|
| Networking system | 2K Polyaddition (Pt) | 2K Polyaddition (Pt) | 2K Polyaddition (Pt) | 2K Polyaddition (Pt) |
| Mixing ratio | 1 : 1 | 1 : 1 | 10 : 1 | see TDS |
| Color | Black (A) / white (B) | Whitish | Optically clear, colorless | Black |
| Shore A hardness | A 48 | A 55 | A 52 | see TDS |
| Elongation at break | 170 % | 78 % | 115 % | — |
| Tensile strength | 2.3 MPa | 2.3 MPa | 6.2 MPa | — |
| Tear resistance | — | — | 4 kN/m | — |
| Potting time | 1.5 h | 130 min | 4 h | long |
| demolding time | 8 h (RT) / 5 min @ 150 °C | 8 h | 24–48 h | with heat treatment |
| Mixed viscosity | 3,000–3,500 mPa·s | 2,200 mPa·s | 4,000 mPa·s | flowable |
| Main application | Aerospace fire protection | Electrical Engineering Encapsulation | Electronic potting | Jet engine compressor air seals |
Technical data for BLUESIL ESA 7252 A
| Product information | |
|---|---|
| Manufacturer | Elkem Silicones |
| Mixing ratio | 1:1 |
| Networking type | Addition (Platinum) |
| Number of components | 2K (two-component) |
| consistency | Flowable |
| Mixing ratio | 1:1 |
| brand | Bluesil |
| Container | 1 kg, 2.5 kg, 5 kg, 25 kg |
| Other features | |
|---|---|
| UV resistance | Yes |
| Physical properties | |
|---|---|
| Paint has hardened | Transparent |
| Self-leveling | Yes |
| Viscosity uncrosslinked (mPa·s) | 3500 |
| Electrical properties | |
|---|---|
| Electrical insulation | Yes |
| Product approvals | |
|---|---|
| Food contact | No |
| Suitable for medical use | No |
| Mechanical properties | |
|---|---|
| Tensile strength (MPa) | 2.3 |
| Elongation at break (%) | 170 |
For binding values, please refer to the technical data sheet (TDS) in the "Documents" tab.
Documents and datasheets
Click on a document for a preview or the download icon for a direct download.
Frequently asked questions about ESA 7252
Practical questions regarding processing and design — answered by SILITECH.
Bluesil ESA 7252 A & B: 2-component platinum silicone with excellent flame resistance (UL 94 V0) and good thermal conductivity (0.42 W/m·K) for thermal and fire protection in aerospace potting. Main applications include aerospace fire protection, power electronics with heat dissipation, and connection boxes.
Polyaddition crosslinking is a two-component silicone chemistry using a platinum catalyst. Component A contains the platinum complex, and component B contains the SiH crosslinker. When mixed, the components crosslink without releasing reaction byproducts—no shrinkage due to outgassing, excellent dimensional accuracy, and low linear shrinkage. Important: Polyaddition silicones are inhibited by various substances—sulfur-vulcanized natural rubbers, tin-catalyzed RTV silicones, amine-catalyzed epoxy resins, and tin-stabilized PVC. In case of doubt, a preliminary test should be carried out.
Thoroughly stir components A and B before each processing step. Measure precisely according to the mixing ratio specified in the TDS (see comparison table above) – ideally by weight. Mix with an electric or pneumatic agitator at low speed (minimize air entrainment). Degas the mixture under vacuum (30–50 mbar) – the material will expand 3–4 times its original volume, bubbles will escape, and the material will settle back after 5–10 minutes. Then slowly pour into the mold from the lowest point to avoid air entrapment. For polyaddition systems, avoid contact with inhibitors (sulfur-based rubber, tin-based RTV, amine epoxides, PVC with tin salts).
Store in the unopened original container in a dry, cool place — typically between +5 and +30 °C, see TDS for exact values. Store components A and B separately; seal airtight after opening. Polyaddition systems are insensitive to moisture, but should be stored in a cool place to maintain pot life. Consult the Safety Data Sheet (SDS) before use.
The comparison table above lists related RTV products with different hardnesses, pot lives, or application profiles. If you are unsure which product is best for you, we would be happy to advise you — contact SILITECH with details of your application (substrate, desired hardness, processing time, mechanical requirements, and durability).
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Product specifications
| Product information | |
|---|---|
| Container | 1kg or 2.5kg or 5kg or 25kg |
| Manufacturer | Elkem Silicones |
| Mixing ratio | 1:1 |
| Networking type | Addition (Platinum) |
| Number of components | 2K (two-component) |
| consistency | Flowable |
| Mixing ratio | 1:1 |
| brand | Bluesil |
| Other features | |
|---|---|
| UV resistance | Yes |
| Physical properties | |
|---|---|
| Paint has hardened | Transparent |
| Self-leveling | Yes |
| Viscosity uncrosslinked (mPa·s) | 3500 |
| Electrical properties | |
|---|---|
| Electrical insulation | Yes |
| Product approvals | |
|---|---|
| Food contact | No |
| Suitable for medical use | No |
| Mechanical properties | |
|---|---|
| Tensile strength (MPa) | 2.3 |
| Elongation at break (%) | 170 |
| Keywords | |
|---|---|
| Keywords | |
| processing | |
|---|---|
| Viscosity of mixture | 1,200 mPa·s |
| Viscosity Comp. A | 1,000 mPa·s |
| Viscosity Comp. B | 1,200 mPa·s |
| Pot life at 23°C | 40.0 min |
| Physical & Thermal | |
|---|---|
| Density (23°C) | 0.98 g/cm³ |
| Temperature resistance (duration) | -50 to 200 °C |
| Peak temperature (short-term) | 200 °C |
| Electrical characteristics | |
|---|---|
| Dielectric constant ε (1 kHz) | 2.8 |
| Dielectric strength | 23.0 kV/mm |
| Contact resistance | 1e+15 Ω·cm |
| Loss factor tan δ | 0.001 |
| storage | |
|---|---|
| Shelf life in original packaging | 12 months |
| Storage temperature | -10 to 30 °C |
Documents and datasheets
Safety Data Sheets (SDS) and Technical Data Sheets (TDS) are available for download: