Is the most chemically inert of the O-ring materials, it is a tough polymer possessing an incredible working temperature range.

PTFE is the most chemically inert of the O-ring materials, it is a tough polymer possessing an incredible working temperature range.

Key Uses: Seals for wide chemical exposure situations, with special emphasis on temperature extremes. Its outstanding tear resistance and abrasive resistance result in its slippery surface properties that make it advantageous for use in seals in moving systems such as mass spectrometer probes and valves.

Resistant to most chemicals including acids, bases, oils, steam and other chemicals PTFE is also very tough and abrasive resistant, even at elevated temperatures. Seals fabricated from this material feature outstanding weather resistance, high resistance to ozone, and high resistance to the degrading effects of exposure to such solvents as acetone, MEK, and xylene. Possessing average elastomer characteristics of 2,500 to 3,500 psi tensile strength, and 300% elongation, they are tough, impact resistant, low friction, non-twisting performers over an extremely wide temperature range.

General specifications (actual specifications may vary)
Standard Colour
  • White

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PTFE is hampered by very poor elastic memory at room, or low temperatures. This presents problems in O-ring installation, and requires extra care to be taken in control over O-ring I.D.

Because of its poor tear resistance, during O-ring installation particular care should be taken to avoid nicking or scratching, as imperfections will cause O-ring leakage. However the material is not easily compressed, and therefore may not seal as easily as some of the other polymers. Finally, the tendency of PTFE to cold flow over time, when used in gasket type applications, may require special material compounding (with fillers) to control such “creep” in critical sealing situations.

Please note: This Material Data Sheet section is to be used as a professional guide only. Eastern Seals (UK) Ltd may source their products from a variety of Quality Approved Suppliers and the data shown should not be relied upon by any purchaser without verification of material source.


Temp Range
Data Sheet
PTFE WHITE -100⁰C to +250⁰C A Conductive PTFE compound 1% by weight composition of Carbon Black. 99% free flowing granular PTFE, for auto Isostatic and general purpose compression moulding. Material meets the FDA regulation under code 21CFR 177.1550 and Euro Directive 10/2011/EC for material that may come into contact with food.


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