Thermosil Heat-Resistant Silicone Sealants for Jet Engines
Reliable, proven performance. Available for fast delivery. Choose Thermosil... Because you do have a choice.

Thermosil T7000 Abradable Air Seal

Thermosil T7000 is a two-part, low-density silicone sealant used to create an abradable air seal for high-speed compressor blades in jet engines. T7000 meets Pratt & Whitney specification PWA 407 and is primarily used in operating environments with temperatures up to 525˚F (274˚C). Here are some more performance-proven features:

  • High-compression glass microspheres and a proprietary microsphere surface treatment produce a securely cross-linked glass-polymer matrix that will not degrade during aggressive mixing or application, ensuring consistent hardness and durability throughout the product life cycle.
  • High-instensity microsphere processing eliminates glass agglomerates that can clog turbine vane cooling holes and cause premature erosion and seal failure.
  • T7000 offers outstanding adhesion during application. Cured material will not adhere to turbine blade tips.
  • T7000 is low-viscosity and easily degassed for efficient application. It offers a working life of over 24 hours and is fully machinable when cured. Plus, its consistent black color provides a great looking finish.
  • Thermosil T7000 is available in a 2.74 kg A/B kit, or in pre-measured void-free A/B component injection cartridges.

Thermosil 4000 Potting and Damping Compound

Thermosil 4000 is a thixotropic, two-part silicone sealant that is applied as a potting compound for low-pressure compressor stator vanes in jet aircraft engines. Its superior elastic properties also allow it to function as a damping compound to minimize vane vibration and stress. Thermosil 4000 excels in ease of application and applied performance.

  • Minimal heat increase during machine mixing allows users to extrude 100% of the cartridge contents for maximum efficiency.
  • Fast extrusion rates for easy application, with excellent adhesion and flow-resistance.
  • Meets Pratt & Whitney specification PWA 404-2 and is primarily used in operating environments with temperatures up to 350˚F (177˚C).
  • Smooth, glossy black finish produces cosmetically superior fillets.
  • Thermosil 4000 is available in pre-measured void-free A/B component injection cartridges.

Thermosil sealants deliver consistent application, adhesion, hardness, durability, heat-resistance and appearance. Add to this FMi Chemical's dedicated customer support, short lead times, fast delivery, and competitive pricing, and you have access to products and a supplier that deliver consistent performance on all levels.