What is Shore hardness scale (Shore durometer)?

Shore durometer is typically used as a measure of hardness in some plastics. The two most common scales, using slightly different measurement systems, are type A and type D scales. Scale A finishes at 98º and scale D starts at 98º. The A scale is for softer and more flexible plastics, while the D scale is for harder, very rigid ones. Another scale used as a measure of hardness of plastics (especially rubber) is Passey-Jones scale (P&J). It is possible to determine hardness in Shore scale having data in P&J scale, and vice versa.

Passey-Jones hardness scale	Shore hardness scale
0	100
4	98
13	94
18	92
23	90
32	86
36	84
40	82
45	80
50	78
60	74
65	72
70	70
75	68
80	66
85	64
90	62
96	60
102	58
108	56
120	52
127	50
141	46
149	44
158	42
167	40
176	38
186	36
197	34
208	32
222	30
240	28
260	26

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