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
Brand Name : STECH
HSN Code :
Dispacth time (Days) :
The images represent actual product though color of the image and product may slightly differ. HSN codes subject to change.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
