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IRHD Hardness Tester For Testing Lab Workshop.
IRHD 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.
Amongst the various means for
the determination of rubber hardness the most important ones are the
Durometer and the IRHD Hardness Tester. While the first uses the
principle of indentation of a truncated cone in rubber under varying
loads acting through a spring, the second method uses a fixed dead load
acting on a hemispherical indenting tip. Whereas the first method
suffers from the disadvantage of permanent set getting developed in the
spring and thus affecting its accuracy, the second method, being based
on dead load principle, is free from this problem.
The IRHD Hardness Tester is
table model equipment suitable for reference testing of hardness of
rubber or similar polymers in the laboratory. It consists of a plunger
rod carrying a hardened hemispherical tip of the specified diameter at
its lower end. The rod is located within a cylindrical guide and is
constrained to move inside it. The base of the guide acts as the
pressure foot surrounding the point of indentation. Under normal
condition the pressure foot extends below the indenting tip, thus
preventing it from getting damaged. An indenting load is positioned over
the plunger rod without directly acting on it
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