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Shore A Hardness Tester For Testing Lab Workshop.
Shore A Hardness Tester -
Hardness is one of the most important properties which
determine the suitability of any rubber component for its intended end
use. Incorrect hardness may defeat the basic purpose for which the
component is designed. Thus accurate and reliable determination of
hardness is of extreme importance in rubber field.
The Shore A Hardness Tester, also called as Durometer,
is the most commonly used instrument for measurement of hardness of any
rubber component. It is based on the measurement of depth of
indentation of an indentor of specified shape being forced into the
material under a specified pressure. This test method is an empirical
method intended primarily for control purposes. No simple relationship
exists between hardness determined by this test method and any
fundamental property of the material being tested.
The durometer consists essentially of the following components:
A pressure foot having a hole of 2.5 to 3.2 mm diameter centered at
least 6 mm from any edge of the foot,
An indentor made of hardened steel having a diameter between 1.15 and
1.40 mm, with a tip in shape of a truncated cone of 35° included angle
and a flat surface of 0.79 mm diameter,
A
dial on which the amount of extension of the tip of indentor may be
read in terms of graduations ranging from zero for full extension of
2.46 to 2.54 mm, to 100 for zero extension, obtained by placing the
pressure foot and indentor in firm contact with a flat piece of glass.
A calibrated spring for applying the specified force to the indentor.
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