Thermosil Heat-Resistant Silicone Sealants for Jet Engines
Proven void-free performance. Certified to OEM specs by our Nadcap and ANAB accredited in-house lab.

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 turbines. T7000 meets the specifications of leading OEMs 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, professional finish.

Thermosil T7000 meets the following OEM specifications:
  • Pratt & Whitney PWA 407
  • GE Aviation A15F18A1/B1
  • Honeywell EMS53163 Type 1 & 2

​Thermosil T7000 is available in a 2.74 kg A/B kit, or in pre-measured void-free component injection cartridges.

Thermosil 7005 
Ready-to-use Abradable Sealant

Thermosil 7005 is a one-part, low-density, heat-resistant silicone sealant that forms an abradable air seal for high-speed compressor blades in jet aircraft engines. Providing outstanding performance and reliability, while speeding throughput in manufacturing and maintenance applications, Thermosil 7005 offers:
  • A one-part formula that is ready-to-use, right from the container; no mixing or degassing required
  • Optimum elasticity and sealing at operating temperatures up to 550˚ F
  • A securely cross-linked glass-polymer matrix for maximum durability
  • No glass agglomerates that can clog down-stream turbine vane cooling holes
  • Self-leveling characteristics for a uniform finish in deep-section applications
  • Safe; no hazardous chemicals or materials (based on environmental risk assessment)
Thermosil 7005 offers sealing solutions for applications where a low density, flexible, machinable, heat-resistant sealant is required. It is available in dispensing gun cartridges and a range of custom packaging options to meet customer-specific applications.

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 component injection cartridges.

From engine manufacturing to MRO, you can count on Thermosil sealants in the plant, in the air, and on the bottom line.

Get Thermosil certified to your specifications
FMi Chemical's ISO 9001:2015 and AS9100D quality certifications, and our in-house Nadcap and ANAB accredited laboratory, ensure that Thermosil products will meet your quality and engineering specifications. Thermosil products are fully tested, certified, batch traceable materials.

High quality is our only standard
Thermosil products contain the highest quality ingredients available. Proprietary manufacturing processes and strict quality controls are employed to ensure consistent, reliable product performance.

Available on time and ready to work, saving you money
FMi Chemical offers short lead times so your Thermosil products will be available when you need them. Custom packaging ensures products are ready to work when they arrive, speeding production. And free support for recertification programs to extend product shelf life (if OEM approved) helps control inventory costs.
To view and download technical data sheets for any of the products on this page, please click here.