SealSpec / Custom gaskets / PTFE
PTFE (solid, filled and expanded) gaskets
Custom-cut ptfe (solid, filled and expanded) gaskets (PTFE): where it works, where it fails, typical properties, and how to call it out on a drawing. Use the builder to spec your part in this material.
Typical properties
| Polymer | PTFE |
|---|---|
| Form | sheet |
| Service temperature | -450 to 500 °F |
| Firmness | Rigid sheet (expanded PTFE is conformable) |
| Common thicknesses (in) | .031, .062, .125, .187, .250 |
Typical ranges for the material family. Specific grades differ: confirm on the datasheet.
Strengths
- Near-universal chemical resistance
- Very wide temperature range
- Food/pharma grades
Watch out for
- Cold flow / creep under bolt load: filled or expanded grades reduce it
- Needs higher seating stress than rubber
Typical applications
- Chemical process flanges
- Pharma and food equipment
- Valves and pumps
Specs and standards to reference
- ASME B16.21 dimensions for flange gaskets
- FDA-compliant grades exist