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SKF offers faster machining of seals in high grade polymers

06 March 2012

The latest series of standalone machine systems for the manufacture of precision machined seals from SKF is providing a fast service for the delivery of customised seals in exceptionally high grade polymers. These materials, which have all been developed by SKF, provide outstanding high-temperaturer and chemical resistance. They include PTFE, HNBR and FKM.

PTFE (polytetrafluoroethylene) is a thermoplastic polymer that offers superior chemical resistance to that of any other material used in conventional seals.  The operating temperature of PTFE extends from -70°C to +200°C and in some applications can reach +260°C.  The polymer has a smooth, dirt resistant surface, an extremely low coefficient of friction, with the ability to tolerate dry running, and offers greater resistance to wear and deformation than conventional seal materials.

HNBR (hydrogenated acrylonitrile butadiene rubber) is used to produce seals for applications where aliphatic hydrocarbons, such as propane or butane and mineral oils and greases, or sulfonated crude oils are present.  It is also ideal for use with many diluted acids, bases, salt solutions and even in high temperatures and glycol water mixtures.

FKM (fluoro-rubber) combines outstanding levels of resistance towards heat, chemicals, ageing and ozone, with minimal gas permeability.  The material has exceptionally good wear characteristics, even under harsh environmental conditions, and can withstand operating temperatures of up to +200°C.

Other high performance materials are available, such as FDA compliant elastomers and polyurethanes, along with expert application advice from the SKF regional centres.

 


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