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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
 
 
Medium and low density cell elastomers
Medium density cellular and compact elastomers
Compact and cellular elastomers
Polyurethanes, PTFE rigid, thermoplastic and elastomeric very hard
Compact elastomers

References:

Shore A/D - Determination of indentation hardness by means of a durometer (Shore hardness) ISO 868:2003 specifies a method for the determination of the indentation 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 permits measurement either of the initial indentation or of the indentation after a specified period of time, or both.

IRHD (International Rubber Hardness Degrees)
Is a method to characterize an elastomer by its resistance to penetration of a known geometry indenter by a known force. The microtechnique is reproduced on irregular, as well as flat, surfaces, and on cross sections as small as 1mm in thickness (.4"). The readings are similar, but not identical, to Shore (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 in Rubber Hardness Testing
http://www.wallaceinstruments.co.uk/sites/wallaceinstruments.co.uk/files/styles/thumbnail/public/paper2.pdf

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