Tri-Clamp Envelope Gaskets – Type 3 (A40MP)
- Creates a reliable, leak-proof seal between Tri-Clamp flanges
- Good chemical resistance with very low swelling and loss of physical properties
- Maintains inner diameter without repeated tightening
- Great choice for clean-in-place systems
- Compound Selection Guide
Tri-Clamp Envelope Gaskets - Type III (A40MP)
An envelope gasket is a multi-layer seal comprised of an outer gasket shell with an inner core. This layered format prevents the core from contacting the process medium. These gaskets provide the benefits of the core materials, like strength, stability, and elasticity coupled with the chemical resistance characteristics of PTFE.
Rubber Fab’s Tuf-Flex® PTFE is specifically designed to meet critical requirements in pharmaceutical, biotechnology, ultrapure water, WFI (water-for-injection).
Orca™, Newman Sanitary Gasket’s Encapsulated Gasket is made from our proprietary 2107 EPDM that has been chemically bonded to a thin layer of PTFE, encapsulating the EPDM. This combination of materials gives the gasket the chemical resistance of PTFE while greatly reducing the traditional problems associated with PTFE/Teflon® hygienic seals.
Because Tuf-Flex® will not impart taste or odor, Tuf-Flex® is your ideal gasket for the Food & Beverage Industry!
If you would like a copy of a gaskets certificate, please ask for them at the time of order. Certificates are specific per lot of gaskets. Much like a heat number for fittings, gaskets have what is called a lot number. We don’t log these numbers at the time of order but we do include them on the packaging if you need the certificate after receiving them.
Please see Compound Selection Guide for compatibility information.
Tri-Clamp Gasket Sizes & Dimensions
| Sanitary Size | A | B | C | D |
| 1/2" | .875 | .4375 | NA | |
| 3/4" | .875 | .6250 | NA | |
| 1" | 1.984" | .900" | 1.718" | 0.203" |
| 1 1/2" | 1.984" | 1.400" | 1.718" | 0.203" |
| 2" | 2.515" | 1.900" | 2.218" | 0.203" |
| 2 1/2" | 3.050" | 2.400" | 2.781" | 0.203" |
| 3" | 3.579" | 2.900" | 3.281" | 0.203" |
| 4" | 4.682" | 3.869" | 4.344" | 0.203" |
| 6" | 6.570" | 5.813" | 6.176" | 0.203" |
| 8" | 8.570" | 7.813" | 8.165" | 0.238" |
| 10" | 10.570" | 9.813" | 10.156" | 0.238" |
| 12" | 12.570" | 11.813" | 12.151" | 0.238" |
Tri-Clamp Gasket Comparison Guide
| Gasket | Temperature Range | Recommended Usage | Not Recommended | Industry | Certification Approval |
|---|---|---|---|---|---|
| Buna (Nitrile) | Standard: -35°F to 250°F (-37°C to 121°C) | Water, Oils, Fuels | Ketones, Strong Acids, Sunlight, Ozone, Weathering | Food & Beverage | FDA Approved |
| EPDM (Ethylene Propylene) | Standard: -65°F to 300°F (-54°C to 149°C) | Sunlight, Weathering, Hot Water, Steam, Select Acids/Bases, Alcohols | Oils, Fuels | Bio-Pharmaceutical, Food & Beverage, Drinking Water | USP Class VI Tested |
| PTFE (Teflon®) | Standard: -100°F to 450°F (-74°C to 232°C) | Chemical, Heat, Pressure Applications | Stretching, Elasticity | Chemical Processing | USP Class VI Tested |
| FKM (Viton®) | Standard: -15°F to 437°F (-26°C to 222°C) | Vacuum, Most Acids / Chemicals, Oils, Fuels | Ketones, Ammonia, Hot Water / Steam | Chemical Processing | USP Class VI Tested |
How to Measure Tri-Clamp Fittings
Tri-Clamp Fittings and Gasket Sizing Guide
| Sanitary Size |
Flange OD (?) |
Tube ID (?) |
Tube OD (?) |
|---|---|---|---|
| 1/2″ | 0.984 | 0.370 | 0.500 |
| 3/4″ | 0.984 | 0.620 | 0.750 |
| 1″ | 1.984 | 0.870 | 1.000 |
| 1 1/2″ | 1.984 | 1.370 | 1.500 |
| 2″ | 2.516 | 1.870 | 2.000 |
| 2 1/2″ | 3.047 | 2.370 | 2.500 |
| 3″ | 3.579 | 2.870 | 3.000 |
| 4″ | 4.682 | 3.834 | 4.000 |
| 6″ | 6.562 | 5.782 | 6.000 |
| 8″ | 8.602 | 7.782 | 8.000 |
| 10″ | 10.570 | 9.782 | 10.000 |
| 12″ | 12.570 | 11.760 | 12.000 |
Looking for even more information on Tri-Clamp fittings?
We have everything you need. Read "The Ultimate Guide to Tri-Clamp Fittings"
Additional information
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What is the Pressure rating for PTFE envelope EPDM gasket ?
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Q What is the Pressure rating for PTFE envelope EPDM gasket ?A Gaskets do not have a pressure rating associated with them. The tri-clamps that hold the gaskets and ferrules together do, however. For more information, please see our Tri-Clamp Fittings Burst Pressure and Temperature Ratings Guide.