PTFE Envelope Gasket with FKM – Unflanged Tri-Clamp Seal

PTFE Envelope Gasket with FKM – Unflanged Tri-Clamp® Seal

Premium sanitary gasket combining chemical versatility and sealing memory for demanding process applications.

Lab Gear’s PTFE Envelope Gasket with FKM Filler merges the inert chemical resistance of PTFE with the flexibility, memory, and high-temperature performance of FKM elastomer. This hybrid design prevents product contamination, reduces service interruptions, and minimizes clean-up costs compared to using elastomer-only seals.

Unlike standard PTFE gaskets, the envelope construction offers better sealing performance in cases of slight ferrule misalignment—making it a reliable choice for sanitary processing lines where precision and purity are critical.

Available Sizes

• 1/2″

• 3/4″

• 1″

• 1-1/2″

• 2″

• 2-1/2″

• 3″

• 4″

• 6″

Key Benefits

• Chemical Compatibility – PTFE resists a wide range of aggressive chemicals.

• Secure, Long-Lasting Seal – FKM provides excellent memory and durability.

• Temperature Rated – Operates from -30°F to 400°F.

• Sanitary Process Ready – Ideal for food, beverage, pharmaceutical, cannabis, and chemical applications.

• Easy Identification – Color code: one white dot, one yellow dot.

Compliance & Standards

• FDA CFR 21, 177.1550 / 177.2600

• U.S. Pharmacopeia Class VI Certification

• ADI Free® (Animal Derived Ingredient Free)

• Current Good Manufacturing Practices (cGMP)

Storage Recommendations

• Shelf Life: 10 years from cure date

• Store in original packaging in a clean, dry warehouse

• Avoid direct sunlight

• Keep more than 6 ft from electric motors

• Maintain temperature between 65°F and 85°F

Pro Tip: While these gaskets significantly reduce creep, cold flow, and leaks compared to pure PTFE seals, these effects may develop over time. For the ultimate long-term solution, consider Rubber Fab’s Tuf-Flex® Gaskets with a fully bonded construction for an exceptionally pure, flexible, and durable seal.