Envelope Seal Type III PTFE Gasket With Fillers

The PTFE Envelope Type III Tri-Clamp Gaskets offer two different inserts for your applications

A PTFE envelope gasket has the chemical resistance of PTFE and the elastomeric characteristics of EPDM or FKM Fluoroelastomer. The PTFE envelope gasket meets FDA and USP Class VI standards.

We suggest using the temperature range of the insert which would be
EPDM: -30ºF to 300ºF (-34ºC to 149ºC)
FKM: -30ºF to 400ºF (-34ºC to 204ºC)

Resources Additional Specs
Size Part# Gasket I.D. Gasket O.D. Bead Center
1/2″ A42MPGR-050-X 0.380 0.860 N/A
3/4″ A42MPGR-075-X 0.620 0.860 N/A
1″ A40MPGR-100-X 0.900 1.985 1.718
1-1/2″ A40MPGR-150-X 1.400 1.985 1.718
2″ A40MPGR-200-X 1.900 2.500 2.218
2-1/2″ A40MPGR-250-X 2.400 3.025 2.781
3″ A40MPGR-300-X 2.900 3.550 3.281
4″ A40MPGR-400-X 3.869 4.675 4.344
6″ A40MPGR-600-X 5.817 6.668 6.156
8″ A40MPGR-800-X 7.775 8.669 8.160
10″ A40MPGR-1000-X 9.771 10.664 10.140
12″ A40MPGR-1200-X 11.725 12.659 12.145
*X = Insert Material E = EPDM V = FKM FLUOROELASTOMER

Additional Specs

  • Buna N (40MPFU-XXX)
  • EPDM (40MPFE-XXX)
  • FKM Fluoroelastomer (40MPFSFY-XXX)
  • Platinum Silicone (40RXPX-F-XXX)
  • Tuf-Steel® (40MPG-TS-F-XXX) * on a custom basis
  • Metal Detectable/X-Ray Inspectable (Consult Factory)
  • Buna N (40MPU-XXX)
  • EPDM (40MPE-XXX)
  • FKM Fluorelastomer (40MPSFY-XXX)
  • Platinum Silicone (40RXPX-XXX)
  • PTFE (40MPG-XXX)
  • Tuf-Steel® (40MPG-TS-XXX)
  • Tuf-Flex® (A40MPGR-TF-XXX)
  • Detectomers® (40MATERIAL-XR-XXX)
*XXX=Size Designation
*Type II Flanged sizes 6″-12″(the P is replaced with O)
Please refer to the Part Numbering links on this page for complete part numbering details
Rubber Fab’s 1/2″-4″ Type II Flanged gaskets are:
  • FDA CFR 177.2600
  • FDA CFR 177.1550
  • U.S. Pharmacopeia Class VI Certification
  • ADI Free® (Animal Derived Ingredient Free) certified
  • Manufactured according to cGMP Guidelines
*Buna N is not USP Class VI or ADI Free
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