Stainless Steel Filled PTFE has enhanced mechanical properties by the use of a 50% by weight (or 15% by volume) stainless steel powder filling.

The material is extremely hard wearing, has excellent strength and stability under extreme loads and elevated temperatures whilst still retaining the low coefficient of friction of conventional PTFE. It is an extremely versatile product and can be used on Steam and Thermal Fluid applications.

It is also an extremely good seat material for use in V-Ball type Flow Control Ball Valve applications due to its high resistance to wear. 


  • Extremely hard wearing
  • Excellent strength and stability under extreme loads and elevated temperatures
  • Lowers creep, cold flow and wear
  • Increased thermal and electrical conductivity


  • Very heavy

Typical Physical Properties of stainless Steel Filled PTFe


Test Method

Typical Values

Specific Gravity  ASTM D 4894 3.35 g/cm3 
Tensile Strength   ASTM D 4894  Min 22 MPa
Elongation   ASTM D 4894 Min 220% 
Shore D Hardness Needle 65 - 69 


Datasheet: Stainless Steel Filled PTFE
AF616 Stainless Steel Filled PTFE 252kb

The addition of Stainless Steel to PTFE gives better dimensional stability and lowers creep, cold flow and wear. It increases hardness and compressive strength whilst also increasing thermal and electrical conductivity.

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