Specialized Items
PTFE Envelope Gaskets
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.
Applications & selection
Typical uses
- Glass-lined flange sealing
- Corrosive media sealing
- Glass pipe joints
Industries: Chemical, Pharmaceutical, Dyes & intermediates.
Selecting the right construction
Provide flange dimensions, envelope profile and insert requirements. The envelope, core and flange loading must be assessed together for the intended medium.
Chemical resistance depends on the polymer, fillers, inserts and process conditions. Confirm the exact medium and concentration; general PTFE properties do not establish a complete assembly's service rating.
Interactive product model
Buyer questions
Where are ptfe envelope gaskets used?
Glass-lined flange sealing, Corrosive media sealing, Glass pipe joints. Typical sectors include Chemical, Pharmaceutical, Dyes & intermediates; suitability depends on the actual service conditions.
What sizes can I request for ptfe envelope gaskets?
Standard and custom flange sizes. Final dimensions and tolerances are agreed during quotation.
What should I specify when ordering ptfe envelope gaskets?
Provide flange dimensions, envelope profile and insert requirements. The envelope, core and flange loading must be assessed together for the intended medium.
How is material suitability confirmed for specialized items?
Submit the exact medium, concentration, temperature, pressure and mechanical duty. Grade availability and compatibility are confirmed for the specific construction; an ASTM reference is not a product certification.
Selecting a filled grade? Read our PTFE vs Teflon engineering guide.
Related products
Request a quotation
Include quantity, dimensions or a drawing, required material and the operating medium. Add concentration, temperature, pressure and motion or shaft speed where relevant. Final grade, inspection requirements and service limits are confirmed during quotation.
Request Quote for PTFE Envelope Gaskets