In a chemical aggressive environment where pollution of the medium is not allowed, a standard gasket will not suffice. A PTFE envelope gasket is the better choice in these applications, since it exhibits high chemical and high pressure resistance. It consists of an envelope of PTFE with an inlay.

Materials

PTFE envelopes

PTFE envelope gaskets have the chemical resistance of PTFE, but the strength and resilience of the inlay material. They are mainly applied as flange gaskets in mild to severely corrosive environments. Since PTFE is an inert material, it may also be used in direct contact with food (FDA approval).

Vanéflon supplies standard off-the-shelf PTFE envelopes or custom made to your specifications. The envelopes are produced in any desired size or shape, even rectangular. There are several types available: straight U-envelope (for average to high pressure), rounded U-envelope (for more flexible inserts), C-envelope with diffusion stop (gasket with 3 mm thick diffusion stop), double U-envelope (for high pressure, applied in places where the medium may contact the upper side of the seal), V-envelope (for lower pressures, the inlay material is up to 2 mm thick).

Key properties 

  • Good chemical resistance
  • Wide temperature range. This depends on the envelope/inlay material
  • Good pressure resistance (depending on inlay material)

Applications

  • Flange gaskets in the chemical industry/process industry
  • Food industry

Materials

PTFE and PTFE compounds

The different Types of PTFE Envelopes

PTFE Envelope Type PF1

PTFE Envelope Type PF1

PTFE Envelope Type PF2

PTFE Envelope Type PF2

PTFE Envelope Type PF3

PTFE Envelope Type PF3

PTFE Envelope Type PF4

PTFE Envelope Type PF4

PTFE Envelope Type PF5

PTFE Envelope Type PF5

PTFE Envelope Type PF6

PTFE Envelope Type PF6

PTFE Envelope Type PF7

PTFE Envelope Type PF7

PTFE Envelope Type PF8

PTFE Envelope Type PF8

Product support

Sealing Solutions: PTFE envelope (3.35 MB)

Material selector

PTFE envelopes

PTFE envelope gaskets have the chemical resistance of PTFE, but the strength and resilience of the inlay material. They are mainly applied as flange gaskets in mild to severely corrosive environments. Since PTFE is an inert material, it may also be used in direct contact with food (FDA approval).

Vanéflon supplies standard off-the-shelf PTFE envelopes or custom made to your specifications. The envelopes are produced in any desired size or shape, even rectangular. There are several types available: straight U-envelope (for average to high pressure), rounded U-envelope (for more flexible inserts), C-envelope with diffusion stop (gasket with 3 mm thick diffusion stop), double U-envelope (for high pressure, applied in places where the medium may contact the upper side of the seal), V-envelope (for lower pressures, the inlay material is up to 2 mm thick).

Key properties 

  • Good chemical resistance
  • Wide temperature range. This depends on the envelope/inlay material
  • Good pressure resistance (depending on inlay material)

Applications

  • Flange gaskets in the chemical industry/process industry
  • Food industry

Materials

PTFE and PTFE compounds

The different Types of PTFE Envelopes

PTFE Envelope Type PF1

PTFE Envelope Type PF1

PTFE Envelope Type PF2

PTFE Envelope Type PF2

PTFE Envelope Type PF3

PTFE Envelope Type PF3

PTFE Envelope Type PF4

PTFE Envelope Type PF4

PTFE Envelope Type PF5

PTFE Envelope Type PF5

PTFE Envelope Type PF6

PTFE Envelope Type PF6

PTFE Envelope Type PF7

PTFE Envelope Type PF7

PTFE Envelope Type PF8

PTFE Envelope Type PF8