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Style 7538

PTFE Gasket Material

This 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.  Cold flow is a problem associated with plain PTFE sheet


pH Range
0 - 14

Max. Pressure
798 psig (55 bar)

-350°F (-210°C) to +500°F (+260°C)

P x T Max.   PxT = PSI x °F (Bar x °C)
350,000 (12,000)
250,000 (8600)

It is suitable for chemically aggressive services works specially especially for flanges that require low bolt loads.  It is recommended for services with water, steam, hydrocarbons, hydrogen peroxide, solvents, refrigerants, cryogenic products, caustics and strong acids.

 Typical Physical Properties
Test Method Physical Property Style 7538
ASTM F 36A Compressibility Range @ 5000 psi

Recovery @ 5000 psi

Min. 30%


ASTM F 37A Sealability .12 ml/h
ASTM F38 Creep Relaxation 40%
ASTM 152 Tensile Strength 14 Mpa
ASTM D 792 Specific Gravity 1.70 g/cm3
DIN 3535 Sealability <.015 cm3/min
 ASTM tests are based on 1/32" sheet thickness and DIN test is based on 1/16" sheet thickness.
Gauge 1/16", 1/8"
Sheet Size 59" x 59"
Phelps Industrial Products, Inc., 6300 Washington Boulevard, Elkridge, Maryland 21075-5397