Oscillating Disc Rheometer
Moving Die Rheometer
Mooney Viscometer
Abrasion Testing Machine
Bond Peel Adhesion Test
Compression Set Device
Impact Tester
Shore Hardness Tester
Hardness Tester(IRHD)
Specific Gravity Balance
Spring Testing Machine
Tearing Strength Tester
Thickness Testing
Resilience Tester
Coeffecient of Friction Tester
Spark Tester
Salt Spray Corrosion Chamber
Demattia Flex Tester
Ross Flex Tester
Specimen Cutting Press
Specimen Cutting Dies
A measure of the indentation resistance of elastomeric or rubber materials based on the depth of penetration of a ball indentor. An initial contact force is applied to an indentor and the penetration is set to zero. The force is increased to a specified total load and the depth of penetration is measured. The IRHD value is related to the depth of indentor penetration. For highly elastic materials, IRHD and Shore A are comparable. An IRHD value of 0 represents a material with an Young's Modulus of zero and an IRHD value of 100 represents a material with an infinite Young's Modulus. The relationship between the depth of penetration (hardness) and the IRHD number is based on: F/E=0.0038r0.65*D1.35



where:
F is the indentation force in Newtons,
E is the Young's Modulus in MPa,
r is the indentor ball radius in mm, and
D is the depth of penetration in mm.

Test Ball Diameter (mm) Contact Force
(N)
Total Force
(N)
Thickness
(mm)
IRHD Range
 N (Normal) 2.5 0.3 5.7 4 30 to 95
 H (High-Hardness) 1.0 0.3 5.7 4 85 to 100
 L (Low-Hardness) 5.0 0.3 5.7 6 10 to 35
 M (Micro) 0.395 0.0083 0.153 4 30 to 95
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