Composition & material selection
Unfilled PTFE for chemical-contact and electrical-insulation components. Review creep, sustained loading and purity documentation before selecting the grade.
Grade characteristics
Use the complete material designation and service conditions when evaluating a compound.
| Composition | Unfilled PTFE; identify any pigment or additive |
|---|---|
| Selection priority | Chemical contact, electrical insulation or clean material path |
| Mechanical consideration | Creep and deformation under sustained load |
| Sliding consideration | Wear evaluated against motion and counterface |
| Documentation | Grade and use-specific material requirements |
Virgin PTFE keeps functional fillers out of the compound. It is a useful starting point when electrical isolation or contact with process media matters more than increasing load capacity.
Unfilled does not mean every supplied form has identical properties. Resin selection and stock manufacturing affect the component, so specify the grade and form alongside the part drawing.
A compressed washer, seal or spacer can change dimension over time. The supporting surfaces and applied load are part of the selection, especially where a maintained gap or seal contact is critical.
For a sliding component, evaluate wear under the actual load and motion. If wear or deformation limits the design, compare a filled compound rather than relying only on PTFE low-friction behavior.
Specific answers
No. Food-contact suitability and documentation relate to the supplied grade and intended use conditions.
It depends on the duty. Unfilled material avoids filler-related changes, while a specified filled grade can address mechanical or sliding requirements.
Select by composition
Describe why unfilled PTFE is required, the component geometry, media, temperature and loading. Include purity, electrical or contact documentation requirements.
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