Name: High-Temperature Industrial Silicone for Extreme Thermal Environments
Brand: SOLLYD Silicone Ink
SKU: 3411

High-Temperature Silicone for Continuous Thermal Service

Advanced platinum-cured and heat-stabilized silicone elastomers for continuous thermal service in automotive, aerospace, power electronics and industrial equipment.

Available as LSR, HCR and RTV systems. Heat-stabilizing additives limit oxidative hardening so seals and insulation retain elasticity, dielectric strength and dimensional stability under prolonged heat load.

Designed for liquid injection molding, extrusion, overmolding and automated gasket dispensing in high-volume production.

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Key Properties & Processing

Continuous Thermal Resistance

Continuous service from −50°C to +260°C; selected grades withstand intermittent exposure up to +315°C. Confirm limits under the actual load, pressure and atmosphere.

Electrical Insulation

Maintains dielectric strength in high-voltage connectors, power modules and sensor housings exposed to localized heat.

Elasticity & Compression Set

Low hardness change and compression set after prolonged thermal aging; typical validation includes 1,000 hours at 200°C.

Industrial Processing

LSR for precision molded gaskets and O-rings; HCR for tubing and profiles; RTV grades for form-in-place seals and bonding.

Technical Data

Property	Value / Description
Product Name	High-Temperature Silicone Elastomer
Synonyms	Heat-resistant silicone rubber, high-temperature LSR, heat-stabilized HCR.
Major Components	Heat-stabilized polydimethylsiloxane (PDMS); platinum-cured addition silicone, HCR or RTV system depending on grade.
CAS No	63148-62-9 (PDMS base) / 68083-19-2 (vinyl-functional silicone)
HS Code	3910000000 (Silicones in primary forms)
Compliance Options	UL 94 V-0, FDA 21 CFR 177.2600, REACH and RoHS grades are available. Compliance applies only to the specified grade.
Appearance	Translucent, white, grey, black or custom color
Viscosity	Grade dependent; formulations available for injection molding, extrusion, overmolding and robotic dispensing.
Service Temperature	−50°C to +260°C continuous; up to +315°C intermittent
Hardness Range	20–80 Shore A
Thermal Aging	Minimal weight loss and hardness change after 1,000 hours at 200°C; confirm with the selected grade data sheet.
Cure System	Platinum-cured addition silicone or heat-stabilized HCR
Mixing Ratio	Typical systems use 1:1 or 10:1 A:B ratios; follow the selected grade data sheet.
Packaging	20 kg pails or 200 kg drum sets
Storage	Store sealed at 10–25°C unless otherwise specified. Keep platinum-cure materials away from sulfur, amines, organotin compounds and contaminated tools.
Safety Information	Consult the SDS before use. Uncured and cured product classification, disposal and transport status depend on the selected grade and local regulations.

Manufacturing Best Practices

Control dosing, cure conditions and contamination to achieve stable high-temperature properties.

Dosing & Mixing

Maintain a strict 1:1 or 10:1 ratio. For large production, use automated MMD equipment to ensure homogeneous blending of the heat-stabilizing additives.

Cure Temperature

Use an initial cure temperature of 150°C–170°C to achieve full cross-linking density and maximum thermal stability.

Post-Curing

For applications exceeding 200°C, use a representative post-cure of 4 hours at 200°C to remove volatile siloxanes and stabilize mechanical properties.

Inhibition Risks (Platinum Catalyst Poisoning)

Avoid sulfur and tin residues, including latex gloves and condensation-cure silicone. Keep the material away from amines in epoxy adhesives and PCBA cleaning agents. Remove heavy-metal and other industrial contaminants from all mixing and molding equipment.

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Typical Applications

Typical uses include turbocharger and cooling-system seals, oven and autoclave gaskets, EV connector insulation, power-module sealing and aerospace engine-compartment components.

Selection Considerations

Select the grade from service temperature, compression set, steam or fluid exposure, dielectric requirements and required certification.

Issue: Premature hardening during prolonged heat exposure

Specify thermal-aging and compression-set limits at the actual operating temperature; do not select by maximum temperature alone.

Issue: Seal leakage after repeated thermal cycling

For continuous fuel or aggressive-oil immersion at elevated temperature, evaluate fluorosilicone (FVMQ).

Comparison: High-Temperature Silicone vs. Standard Materials

Feature	High-Temperature Silicone	Standard Silicone	Fluorosilicone (FVMQ)
Maximum Continuous Temperature	Up to 260°C	180°C–200°C	Up to 230°C
Thermal Aging	Low hardness change	May harden or crack	Good
Oil Resistance	Moderate	Poor	Exceptional
Typical Use	High-temperature sealing	General-purpose sealing	Fuel and oil exposure

Customer Case

Challenge: Autoclave seals became brittle and leaked after three months under repeated 134°C steam and 200°C dry-heat cycles.
Solution: A 60 Shore A, heat-stabilized platinum-cured silicone optimized for low compression set at 200°C.
Result: Service life increased from three months to over one year, with 1,500+ sterilization cycles and 60% lower downtime and service costs.

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FAQ – Troubleshooting

Q: Can high-temperature silicone withstand direct flame exposure?

A: While these silicones are stable up to 300°C, they are not intended for direct flame contact unless specifically formulated as Flame Retardant (UL 94-V0) grades; even then, they will eventually char if exposed to constant flame.

Q: Why does standard silicone turn brittle at high temperatures?

A: Standard silicone undergoes “oxidative cross-linking” when exposed to heat and oxygen, causing the polymer chains to harden; our high-temperature grades contain antioxidants and stabilizers to inhibit this process.

Q: Is high-temperature silicone resistant to engine oils and fuels?

A: High-temperature silicone has moderate oil resistance; however, for continuous immersion in fuels or aggressive oils at high heat, we recommend Fluorosilicone (FVMQ) for superior chemical resistance.

Q: What is the benefit of post-curing for high-heat applications?

A: Post-curing removes residual volatile siloxanes and completes the cross-linking process, which significantly improves the compression set and prevents part shrinkage or outgassing during high-temperature service.

Q: How do you achieve a 300°C intermittent rating?

A: We utilize high-purity siloxane polymers combined with specialized inorganic heat stabilizers (like iron oxide or cerium) that neutralize the free radicals generated at extreme temperatures.

Q: Is high-temperature silicone food-grade?

A: Yes, we offer specific grades that meet FDA 21 CFR 177.2600 and BfR XV requirements, making them suitable for high-heat food processing equipment and kitchenware.