Mineral PTFE

Mineral-filled PTFE materials are usually referring to mica-filled PTFE compounds. However, there are other mineral fillers added to PTFE compounds to produce special applications.

  • Calcium fluoride (CaF2) can replace glass in end-uses where glass is attacked by chemicals.
  • Alumina (Al2O3) is an excellent electrical insulator, which also improves the mechanical properties of the compound for use in high voltage components.
  • Mica (Phyllosilicate) has a plate-like structure and its particles tend to orient themselves perpendicularly to the molding direction. This results in a significant reduction in shrinkage and the coefficient of thermal expansion in the direction of orientation. However, the physical properties of the compounds are severely lowered; therefore, mica compounds are recommended for compressive applications only.

PBY Material Codes:

PB10508 - 15% Mineral Filled PTFE

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Mineral PTFE Spec. Summary 

Property Test Method Units 15 MINERAL
Color - - White
Specific Gravity ASTM D792 - 2.21 - 2.28
Hardness Shore D ASTM D2240 - 57-67
Tensile Strength, min. ASTM D4745 PSI [MPa] 2,400 [16.5]
Elongation at Break, min. ASTM D4745 % 250
Second Melt Peak Temp. ASTM D3418 °F [°C] 621 [327]
Glass Transition Temp. ASTM D3418 °F [°C] -143 [-97]; 246 [119]

Material Available In:

Mineral PTFE Rods

Mineral PTFE Tubes

Mineral PTFE Sheets

Mineral PTFE Material

  • Mineral-Filled PTFE is FDA Compliant

  • Self-Lubricating

  • Maintains performance at +450° temperatures

  • Compatible with a wide range of mating surfaces

Typical Applications for
Mineral PTFE Plastics

  • Corrosion-resistant lining of steel parts

  • Valves and pipes

  • Gaskets requiring low deformation under load

Mineral PTFE Requirements



Mineral PTFE Material
Data Sheet Downloads

PB10508 - Material Data Sheet


  • Wypych, George. Handbook of Polymers. 2nd Ed., ChemTec/Publishing, 2016.
  • Ebnesjjad, Sina. Fluoroplastics Vol1 & Vol2. 2nd Ed., Elsevier Inc., 2015.
  • Aerospace Materials Specifications for PTFE materials (AMS3678)
  • American Society for Testing and Materials (ASTM) Standards