PTFE
Style 7538 - Glass Micro-Spheres Filled PTFE
Phelps Style 7538 gasket material is made with 100% Virgin PTFE and uses Hollow Glass Micro-Spheres as the filler. This PTFE sheet is manufactured by a unique process that structures the composition into fibers that overcome creep relaxation and/or cold flow. Style 7538 is ideal for chemically aggressive services works especially for sensitive flanges that require low bolt loads.
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Phelps Style 7538 is an excellent gasketing and sealing material
- Stress sensitive and fragile flanged joints
- Piping systems, glass apparatus flanges (medical and pharmaceutical)
- Irregular steel, metal alloy, ceramics or plastics flanges
- Glass & glass-lined flanges, and rubber-lined piping systems
ASTM F 36A
Compressibility Range @ 5000 psi: minimum 30%
Recovery @ 5000 psi: 30%
Sealability (ASTM F 37A): 0.12 ml/h
Creep Relaxation (ASTM F38): 40%
Sealability (DIN 3535): < 0.015cm3/min
Specific Gravity (ASTM D 79): 1.70 g/cm3
Meets ABS, FDA and USDA specifications: FDA 21CFR 177.1550)
Outstanding dimensional stability
Provides tight seal, and excellent bolt torque retention
Great for stress sensitive and fragile flanged joints that require low bolt loads
Highly Compressible layers conform to flange irregularities, especially on warped, pitted, or scratched flanges
Refrigerants (freon), cryogenic products
Hydrocarbons, solvents, caustics and strong acids
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