PTFE Envelope Gaskets
PTFE envelope gaskets are composite sealing solutions combining the superior chemical resistance of PTFE with the strength and resilience of a soft or metallic inlay, ideal for chemically aggressive and contamination-sensitive applications.
Overview
PTFE envelope gaskets are composite gaskets consisting of a PTFE outer envelope and an internal inlay. The PTFE layer provides excellent chemical resistance, while the inlay supplies mechanical strength, dimensional stability, and improved pressure resistance.
Design & Construction
- Outer envelope made of virgin or modified PTFE
- Internal inlay for strength and resilience
- Designed primarily for flange sealing applications
- Prevents direct contact between process media and inlay material
Inlay Materials
- Compressed non-asbestos fiber
- Elastomer-bound fiber
- Metallic inlays (upon request)
Key Properties
- Excellent chemical resistance due to PTFE envelope
- Wide operating temperature range (depending on envelope and inlay)
- Good pressure resistance supported by inlay material
- Low permeability and contamination-free sealing
Performance Characteristics
- Suitable for chemically aggressive media
- Provides reliable sealing under fluctuating operating conditions
- Maintains integrity where standard soft gaskets may fail
Applications
- Chemical and petrochemical industry
- Process industry
- Pharmaceutical production
- Food and beverage industry
- Systems where media contamination is not permitted
Food & Safety Compliance
- PTFE is physiologically inert
- Suitable for direct contact with food
- Complies with FDA requirements for food applications
Advantages
- Combines chemical resistance with mechanical strength
- Prevents process media contamination
- Wide compatibility with aggressive chemicals
- Long service life compared to conventional soft gaskets
Notes
- Maximum pressure and temperature depend on inlay selection
- Proper installation torque is essential to avoid PTFE cold flow
- Recommended for applications where standard gaskets are unsuitable
