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General Description:
WA-8 is a flexible solid wave, asbestos based friction material made from yam, spun around brass wire, which contributes considerably to its strength.
WA-B has medium / high co-efficient of friction combined with moderate temperature and wear resistance.
WA-8 is available in roll form segments. Cones and special shapes can easily be cut from it. Being a flexible material, it is possible to form it to radius when fitting it. Forming can be made easier by placing the material in an oven at a temperature of not more than 100oC (212oF) until it has heated throughout to soften he imp regnant.
WA - 8 is designed solely for use under dry conditions (i.e. it is not suitable for use in oil).
WA - 8 can also be supplied with both surface ground.
Applications:
Industrial band and drum brake linings industrial band, plate and cone clutch lining (eg. cranes, lifts, excavates, winches, concrete mixters, drop hammers, mine widening appliances, underground houlages, tippers, oil well draw works, road rollers, sugar mill centrifuges)
Certain heavy road transport vehicles and tractors.
Technical Specifications:
Friction
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Mu for design purposes
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- 0.35
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Physical Properties
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Data based on standard test methods
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Specific gravity
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1.6 kgs / cm2
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Ult. tensile strength
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246 kgs / cm2 |
Ult. compressive strength
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630 kgs / cm2 |
Rivel holding capacity
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900 kgs / cm2 |
Recommended operating range
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Maximum temperature
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260oC
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Maximum continuous temperature
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125oC
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Note:
The continuous temperature quoted is for constant slip conditions. For intermittent applications, bulk temperature of 160oC are acceptable for long periods.
Recommended mating surface:
Good quality fine grained pearlitic cast iron. Cast steel is not suitable mating surface but forged or cold rolled steel with a brine ll hardness of 200 or more may be used.
Design value:
The co-efficient of friction design should be based upon the graph, the seventy of application and maximum anticipated operating temperature being taken into account. Normal engineering practice should be followed in applying an appropriate safety factor to torque requirement of brake / clutch unties.
Machining:
High speed steel tools are recommended for use with this material.
Size Range (Nominal):
Supplied in rolls of approximately 15 meters (50 ft) and thickness from 4.8mm (3/16") to 19mm 13/4") and width from 25.4mm.
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