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Elastomeric materials are usually measured with either a Shore A Scale Durometer or an IRHD dead load system. These tests are designed for use with samples approximately 6mm thick, and a surface area sufficient to permit at least 3 test points 5mm apart and 13mm from the edge of the material.
Measuring Shore A – D, 0 and 00
The method for measuring Shore hardness’s is through a spring loaded indentation device, on which values are obtained as a function of the viscoelastic property of the material. The cone indenter extends 2.5mm from the base plate and is pressed onto the sample material, generating resistance against an 822g spring. Each 0.0254 mm of deflection of the indenter is shown as 1 degree Shore (A), therefore, the harder the material, the more the deflection, the higher the number.
Measuring IRHD (International Rubber Hardness Degrees)
The method for measuring IRHD hardness’s is through an instrument with a spherical indenter which indents the sample under a minor and major Load. The differential indentation depth is measured and tabulated to read directly in “IRHD” degrees. The displacement / IRHD degrees conversion table is published in ISO 48 : 1994. The standard shows three different combinations of Ball & Loadings, (N) Normal, (H) High and (L) Low.
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Shore 00 ASTM D 2240 |
Shore 0 ASTM D 2240 |
Shore A DIN 53505 |
Shore D DIN 53505 |
IRHD ASTM 1415 |
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|
100 |
58 |
100 |
|
|
|
95 |
46 |
95 |
|
|
|
90 |
39 |
90 |
|
|
|
85 |
33 |
85 |
|
98 |
84 |
80 |
29 |
80 |
|
97 |
79 |
75 |
25 |
74 |
|
95 |
75 |
70 |
22 |
68 |
|
94 |
72 |
65 |
19 |
64 |
|
93 |
69 |
60 |
16 |
62 |
|
91 |
65 |
55 |
14 |
54 |
|
90 |
61 |
50 |
12 |
49 |
|
88 |
57 |
45 |
10 |
44 |
|
86 |
53 |
40 |
8 |
39 |
|
83 |
48 |
35 |
7 |
35 |
|
80 |
42 |
30 |
6 |
28 |
|
76 |
35 |
25 |
|
|
|
70 |
28 |
20 |
|
|
|
63 |
21 |
15 |
|
|
|
55 |
14 |
10 |
|
|
|
45 |
8 |
5 |
|
|
|
Medium and Low Density Cellular Elastomers, Urethane Foam & Cork |
Solid and Cellular Elastomers |
Polyurethanes, PTFE rigid, Thermoplastic and Elastomeric, very hard |
Solid Elastomers |
You can download this chart by clicking here
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