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Product List for PTFE Components

PTFE & ENCAPSULATED 'O' RINGS

Material
Polytetrafluoroethylene (PTFE) is an almost chemically inert thermoplastic material which retains useful mechanical properties over a wide range of temperatures. These characteristics have caused PTFE to be used as a sealing material, particularly where lubrication problems exist.

In order to meet the demanding physical properties required, Crossley ‘O’ rings are manufactured from moulded stress-relieved virgin materials that are processed under strict controls to ensure they meet dimensional stability and conform to the highest standards.

Crossflon ‘O’ Rings Offer:

Exceptional chemical and corrosion resistance
Wide operating temperature (-100°C to +250°C)
Low Friction
Self-Lubricating
Non-stick

The unique combination of properties in Crossflon ‘O’ rings made from PTFE are not only superior to other sealing systems, but are also vital in many situations in which other ‘O’ rings made in other materials are not suitable.

Crossley Crossflon® Materials
It may be necessary in certain instances to taylor the basic properties of PTFE in order to improve the load bearing performance, thermal conductivity and wear rate. Each of these properties can be enhanced by the use of various fillers such as ceramics, carbon, graphite and molybdenum disulphide. It should be noted that in some instances the addition of certain fillers can reduce the coefficient of thermal expansion by up to 50%.

P.C.T.F.E (Polychlorotrifluoroethylene)
This material is closely related to PTFE but demonstrates better ductility at extremely low (cryogenic) temperatures. It is used widely in the aerospace industry.

T.V and T.S ‘O’ Rings
Crossley TV and TS ‘O’ ring seals combine the excellent qualities of fluoropolymer with Viton or Silicone Rubber. The elastomer core is totally encapsulated by a FEP outer jacket. This combination enables TV and TS ‘O’ ring seals to give the maximum protection against virtually all chemicals. TV and TS ‘O’ rings are ideal for those applications where improved compression set and greater compressive recovery are required.

TV and TS ‘O’ rings with a fluoroelastomer core and FEP jacket are resistant to most chemicals, and are particularly suitable for oils and solvents and have a temperature range of -40°C to +205°C.

TS ‘O’ rings have a silicone rubber core with a FEP jacket, and are particularly suitable for cryogenic applications and general chemicals. They exhibit slightly better resilliance under load, and have a temerature range of -73°C to +205°C.

Our technical sales department is available to advise on type and optimum material required for your application.

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