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Description
A high performance material based on Aflas® tetrafluoroethylene/propylene (FEPM) from Asahi Glass. The unique combination of Walkersele® and Aflas® provides long-term protection for bearings that operate in highly aggressive chemical environments with steam.
Walkersele Aflas® has been developed by James Walker Technology Centre in liaison with a major manufacturer of pulp and paper plant. It solves the problem of bearing protection on dewatering presses (pulp washers) used in chemical pulping lines.
Special features
Walkersele Aflas® uses James Walker's high performance Aflas®-based AF90LS compound that provides:
Typical applications
Radial lip seals for bearing protection on chemical pulping lines and other processes where the combination of aggressive bleaching agents plus high temperature water and steam produce an environment where other elastomers cannot survive for long. (Note: In such environments, seals moulded in standard nitrile NBR or fluoroelastomer FKM suffer an unacceptable level of elastomer volume swell caused by chemical and physical interactions.)
Media compatibility
Excellent resistance to aggressive bleaching agents (particularly chlorine-free types) and high-temperature water/steam, as well as strong acids, oils, lubricants and some fuels, weathering and ozone.
Seal construction
Rigid back of fibre-reinforced Aflas®, with flexible Aflas® sealing lip. A modified Walkersele® D1 design is used for pulping line duties - this features:
Walkersele Aflas® is also manufactured in D6 and D7 designs for duties beyond chemical pulping lines. All designs suit housings fitted with retaining plates.
Moulding capability
Aflas® compounds are restricted mainly to highly specialised duties as they are exceptionally challenging to mould accurately in complex sections for rotary seals. We have overcome these problems.
Years of process engineering refinement with Aflas® compounds have enabled us to perfect a unique moulding technique for Walkersele Aflas® production - without the addition of other polymers to aid processing.
How supplied
Walkersele Aflas® seals are manufactured to order.
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