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Hardness table (conversion)

Shore 00
(ASTM D 2240)
Shore 0
(ASTM D 2240)
Shore A
(DIN 53505)
Shore D
(DIN 53505)
IRHD
(ASTM 1415)
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
62
21
15
55
14
10
45
8
5
(1)
(2)
(3)
(4)
(5)
1. Low and medium density cellular elastomers
2. Medium-density compact and cellular elastomers
3. Compact and cellular elastomers
4. Polyurethanes, Rigid PTFE, Very hard thermoplastics and elastomers
5. Compact elastomers

References:

Shore A / D - Determination of penetration hardness by means of a hardness tester (Shore hardness)
ISO 868 : 2003 specifies a method for determining the penetration hardness of plastics and ebonite by means of durometers of two types: type A is used for softer materials and type D for harder materials. The method allows measurement of either the initial indentation or the indentation after a specified period of time, or both.

IRHD (International rubber hardness graduation)
It is a method to characterize an elastomer by its resistance to penetration of an indenter of known geometry by a known force. The microtechnic is reproduced in irregular, flat, surfaces, and in cross sections as small as 1mm thick ( 0,4" ). The readings are similar, but not identical, to Shore model ( TM , Wilson - Shore Instruments)

ASTM D 1415
http://www.astm.org/Standards/D1415.htm

ASTM D 2240
http://www.astm.org/Standards/D2240.htm

DIN 53505
http://www.beuth.de/en/standard/din-53505/24622623

ISO 7619
http://www.iso.org/iso/catalogue_detail.htm?csnumber=50756

Understanding the "IRHD" and "Shore" methods used for rubber hardness measurement
http://www.wallaceinstruments.co.uk/sites/wallaceinstruments.co.uk/files/styles/thumbnail/public/paper2.pdf

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