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Fusion™ 665

Greene Tweed’s Fusion™ FKM 665 is a new generation, ultra-low-temperature, and chemical-resistant elastomer. It achieves outstanding low-temperature performance without compromising high-temperature performance.Fusion™ 665 is specifically formulated to meet and exceed the requirements of Aerospace Material Specification (AMS) 7379 and AMS-P-83461.

Before Fusion™ 665, elastomer material selection required trade-offs – optimal low-temperature performance meant sacrificing high-temperature operating range, chemical compatibility, or dynamic sealing performance. Fusion™ 665 was developed as a true -65°F (-53°C) FKM elastomer to overcome existing limitations of comparable materials:

Compression set at high temperatures is one of the leading causes of seal leakage, particularly when those seals are then required to operate at low temperatures. How Does Fusion™ 665 Compare to NBR?

Features and Benefits

  • Low-temperature FKM (-70°F/-57°C)
  • High-temperature capabilities (450°F/232°C)
  • Excellent chemical compatibility
  • Exceeds AMS 7379 and AMS-P-83461 specification requirements

Fusion™ 665 – A Variety of Products and Shapes

From simple o-rings to metal-bonded jackets, and all standard Greene Tweed seals, Fusion™ 665 is available in many different products and shapes.



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