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Properties - Abrasion/Coefficient of Friction/Electrical Properties
Resistance to wear may be a very important property
in many applications. Standard test methods use a uniform abrading material and
application. Abrasion is a measure of the amount of material lost in these
ISO 4649 (ISO), 5470 (Taber)
ASTM D394 (Du Pont), D1630 (NBS),
D2228 (Pico), D3389 (Taber)
of Friction: The coefficient of
friction is the ratio of the frictional force between two bodies, parallel to
the contact surface, to that of the force normal to the contact surface.
Breakaway friction is the threshold friction coefficient as motion begins, and
running friction is the steady-state friction coefficient as motion continues.
Resistivity: The measure of
electrical resistance through a volume of elastomer. This property is useful in
predicting conductive or antistatic behavior.
Dielectric Constant (Permittivity):
The ratio of the capacitance of a capacitor filled with the elastomer to that of
the same capacitor having only vacuum as the dielectric.
Dielectric Strength: The measure
of the ability of an elastomer to resist current flow when a voltage is applied.