Specialized Items
PTFE Envelope Gasket — Standard and custom flange sizes
Envelope gaskets for trouble-free sealing from mild to severely corrosive service, ideal for alloy, standard steel and glass-lined flanges as well as plastic, ceramic and conical end glass pipe.
Technical specifications
| Dimensional availability | Standard and custom flange sizes |
|---|---|
| Tolerances | Envelope profile and thickness to approved drawing |
| Available grades | Virgin PTFE, 15% Glass-filled PTFE, 25% Glass-filled PTFE, 25% Carbon-filled PTFE, Bronze-filled PTFE |
| ASTM test references | ASTM D4894, ASTM D4745 |
Final dimensions, tolerances and material grade are confirmed against your drawing and service conditions.
Interactive product model
Buyer questions
Which grades are available for PTFE Envelope Gasket?
Virgin PTFE, 15% Glass-filled PTFE, 25% Glass-filled PTFE, 25% Carbon-filled PTFE, Bronze-filled PTFE are available subject to size, quantity and service requirements.
Can PTFE Envelope Gasket be manufactured to a drawing?
Yes. Envelope profile and thickness to approved drawing. Final tolerances are confirmed during quotation.
What is the continuous operating temperature of PTFE?
Virgin PTFE is commonly specified for continuous service from approximately -200°C to +260°C. Actual limits depend on load, pressure, filler grade and the process medium.
Selecting a filled grade? Read our PTFE vs Teflon engineering guide.