Elastomers
PTFE Envelope Gasket
PTFE outer sheath with EPDM/NBR rubber insert for maximum chemical resistance.
Composite flange gasket combining the universal chemical inertness of a virgin PTFE outer envelope with the high resilience and recovery of an internal elastomeric or CNAF core. Ideal for glass-lined and plastic pipe flanges.
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Specifications
Technical profile
- Construction
- Machined or slit virgin PTFE envelope with insert core
- Core material
- EPDM rubber / NBR rubber / CNAF non-asbestos sheet
- Flange standard
- ANSI B16.21 Class 150/300, DIN PN10/16/25/40, JIS
- Pipe sizes
- 1/2 inch to 24 inch (DN15 to DN600)
- pH range
- pH 0 to 14 total chemical immunity (except molten alkali metals)
- Temperature
- -50 °C to +200 °C
- Bolt torque
- Low seating stress required — ideal for fragile glass-lined flanges
Specifications are typical and vary by variant. Share your duty conditions for an exact recommendation.
Key benefits
Why this product
- 100% protection of the resilient core from corrosive acids, halogens, and solvents
- Low bolt load seating prevents cracking of glass-lined reactors and FRP/PVDF flanges
- FDA compliant virgin PTFE surface prevents product contamination in pharma synthesis
- Reusable envelope design allows core replacement during scheduled piping inspections
Applications
Typical industries
ChemicalPharmaDye Manufacturing
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Need this ptfe envelope gasket for your line?
Share your duty conditions and drawings — our team responds with a technical recommendation and a firm quote.