Mineral-filled PTFE materials are usually referring to mica-filled PTFE compounds. However, there are other mineral fillers added to PTFE compounds to produce specially 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, physical properties of the compounds are severely lowered; therefore, mica compounds are recommended for compressive applications only.
PBY Material Codes:
PB10500M - 10% Mineral Filled PTFE
PB10508T - 15% Mineral Filled PTFE
PB10509T - 5% Moly 10% Mineral Filled PTFE
PB10510W - 25% Calcium Fluoride Filled PTFE
Mineral PTFE Properties:
Mineral-Filled PTFE is FDA Compliant
Maintains peformance at +450° temperatures
Compatibile with a wide range of mating surfaces
Corrosion-resistant lining of steel parts
Valves and pipes
Gaskets requiring low deformation under load