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Modified PTFE Gasket Sheet25% Glass Fiber - Style No: TFFG

Modified PTFE is a gasket material with a virgin PTFE base to which a substance is added during manufacture to improve the sealing characteristics of PTFE. This "filler" usually is glass or graphite particles although ceramics has sometimes been used. The resulting gasket material is strong, yet highly compressible with very good, though not universal, chemical resistance.

PTFE is reinforced with glass fibres, the percentage varying between 5 and 40%. The added glass fibre improves the wear properties and, to a minor degree, also the deformation strength under load while leaving substantially unchanged the electrical and chemical characteristics. Glass itself, has a rather poor resistance against alkalis and is easily attacked by hydrofluoric acid. The coefficient of friction is slightly increased and for this reason, graphite is sometimes added to compensate this side effect.


Modified PTFE Sheet Data Sheet- Glass Fiber

Color

Off white

Composition

PTFE with Glass

Temperature

from -260°C to + 260°C

Pressure Max bar

83

Sealability ASTM Fuel A ml/hr
(ASTM F37B)3

0.3

Compressibility Range
(ASTM F36) %

10-20

Recovery %
(ASTM F36)

>45

Tensile Strength
(ASTM D1708)(N/mm2)

14

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