PTFE Envelope Tri-Clamp Gaskets with Viton Filler

PTFE Envelope Tri-Clamp Gaskets are the only choice when needing
extreme chemical resistance and temperature range. These gaskets are
extremely unique in their construction because they have a Viton filler
for compressibility surrounded by an ‘Envelope’ of PTFE which creates a
unique combination of chemical resistance while providing an exceptional
sealing characteristic. Normal solid PTFE gaskets are very tough to
seal on their own and are usually not recommended in vacuum applications
due to the gasket being very rigid because PTFE is not very
compressible by itself.

Key Features:

  • Excellent resistance to almost all chemicals
  • Excellent Temperature Range
  • Excellent Cleanability due to PTFE (Teflon) Envelope
  • No Chemical Leaching 


Material PTFE(Teflon)/Viton Filler(FKM)
Color White/Black
Connection Type Tri-Clamp

Passes USP Class VI Cytotoxicity Testing and is suitable for high purity pharmaceutical grade applications.
PTFE is FDA 21, 177,1550 compliant and the FKM(Viton) inner cores are FDA CFR 21, 177.2600 compliant.

Thermal Properties:  
   -Low Temperature Range -100°F
   -Minimum Continous Use (Static) -65°F
   -Brittle Point -100°F
   -High Temperature Range +400°F
   -Maximum for Continous Use (Static) +400°F
Durometer or Hardness Range 75 Shore A
Abrasion Resistance Good
Tear Resistance Excellent
Compression Resistance Good

Chemical Compatibility:

Butane A – Excellent
Propane (liquified) A – Excellent
   -Amyl A – Excellent
   -Benzyl A – Excellent
   -Butyl A – Excellent
   -Diacetone A – Excellent
   -Ethyl A – Excellent
   -Hexyl A – Excellent
   -Isobutyl A – Excellent
   -Isopropyl A – Excellent
   -Methyl A – Excellent
   -Octyl A – Excellent
   -Propyl A – Excellent