Products

Extreme High Temperature Silicone

ElastaPro’s extreme high-temperature silicone is designed for applications that need higher temperature resistance than general purpose grade silicone can provide. This high-temperature material uses the latest in Heat Stabilizer Technology. It is easily die-cut and provides a superior gasket and sealing solution. Choose thicknesses from .010” to .500”, widths up to 60” wide, and various color and catalyst options. This advanced material is available as solid silicone sheet and uncured silicone compound.

55 to 60 Durometer Extreme High Temperature Silicone

Extreme high temperature silicone comes in the following durometer.

Key Characteristics

  • Extreme High & Low-Temperature Resistant -85ºF to +600ºF (Intermittent)
  • Excellent for Seals & Gaskets
  • Fabricated with high-quality and certified raw materials
  • UV / Ozone Resistant & Excellent Electrical Insulator
  • Cured Silicone Sheet is Non-Toxic & Chemically Inert
  • >750PSI TENSILE, >90% ELONGATION, AND >70 TEAR (after 168 hrs at 300C)

Material Properties

extreme high temperature silicone

What is Extreme High Temperature Silicone?

Extreme high temperature silicone is a specialized type of silicone rubber designed to maintain its physical and mechanical properties at exceptionally high temperatures—typically above 250°C (482°F) and up to 300°C (572°F) or more for short durations. Some grades, especially those reinforced with additives like fumed silica or ceramic fillers, can tolerate even higher intermittent temperatures, often reaching 315°C (600°F) or more.

Advantages

  • Thermal stability: Excellent resistance to heat degradation.

  • Flexibility: Remains elastomeric (rubbery) at high temperatures.

  • Chemical resistance: Withstands oils, solvents, and oxidation at elevated temps.

  • Low outgassing: Suitable for cleanroom and aerospace use.

  • Electrical insulation: Retains dielectric properties under heat stress.

Applications

  • Aerospace and aviation: Thermal insulation, engine gaskets, and fire barrier seals.

  • Automotive: Turbocharger hoses, high-temp seals, and engine bay components.

  • Industrial ovens and furnaces: Gaskets, seals, and thermal shielding.

  • Electronics: High-temp wire insulation and potting compounds.

How It Differs From Standard Silicone:

Property Standard Silicone Extreme High Temp Silicone
Max Continuous Temp ~200–250°C 250–300°C or higher
Additives Basic fillers Heat-resistant fillers or reinforcements
Cost Lower Higher due to enhanced formulation
Durability in Harsh Heat Moderate Excellent