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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
|
-
0.35
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Physical Properties
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Data
based on standard test methods
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Specific
gravity
|
1.6
kgs / cm2
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Ult.
tensile strength
|
246
kgs / cm2 |
Ult.
compressive strength
|
630
kgs / cm2 |
Rivel
holding capacity
|
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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