BUEHLER®

Load 25gf (0.025kgf)
Diagonal Knoop Hardness Number
(µm) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
104 32.9 32.8 32.8 32.7 32.6 32.6 32.5 32.5 32.4 32.3
105 32.3 32.2 32.1 32.1 32.0 32.0 31.9 31.8 31.8 31.7
106 31.7 31.6 31.5 31.5 31.4 31.4 31.3 31.2 31.2 31.1
107 31.1 31.0 31.0 30.9 30.8 30.8 30.7 30.7 30.6 30.6
108 30.5 30.4 30.4 30.3 30.3 30.2 30.2 30.1 30.1 30.0
109 29.9 29.9 29.8 29.8 29.7 29.7 29.6 29.6 29.5 29.5
110 29.4 29.3 29.3 29.2 29.2 29.1 29.1 29.0 29.0 28.9
111 28.9 28.8 28.8 28.7 28.7 28.6 28.6 28.5 28.5 28.4
112 28.4 28.3 28.3 28.2 28.2 28.1 28.1 28.0 28.0 27.9
113 27.9 27.8 27.8 27.7 27.7 27.6 27.6 27.5 27.5 27.4
114 27.4 27.3 27.3 27.2 27.2 27.1 27.1 27.0 27.0 26.9
115 26.9 26.9 26.8 26.8 26.7 26.7 26.6 26.6 26.5 26.5
116 26.4 26.4 26.3 26.3 26.3 26.2 26.2 26.1 26.1 26.0
117 26.0 25.9 25.9 25.9 25.8 25.8 25.7 25.7 25.6 25.6
118 25.5 25.5 25.5 25.4 25.4 25.3 25.3 25.2 25.2 25.2
119 25.1 25.1 25.0 25.0 25.0 24.9 24.9 24.8 24.8 24.7
120 24.7 24.7 24.6 24.6 24.5 24.5 24.5 24.4 24.4 24.3
121 24.3 24.3 24.2 24.2 24.1 24.1 24.1 24.0 24.0 23.9
122 23.9 23.9 23.8 23.8 23.7 23.7 23.7 23.6 23.6 23.6
123 23.5 23.5 23.4 23.4 23.4 23.3 23.3 23.2 23.2 23.2
124 23.1 23.1 23.1 23.0 23.0 23.0 22.9 22.9 22.8 22.8
125 22.8 22.7 22.7 22.7 22.6 22.6 22.6 22.5 22.5 22.4
126 22.4 22.4 22.3 22.3 22.3 22.2 22.2 22.2 22.1 22.1
127 22.1 22.0 22.0 22.0 21.9 21.9 21.8 21.8 21.8 21.7
128 21.7 21.7 21.6 21.6 21.6 21.5 21.5 21.5 21.4 21.4
129 21.4 21.3 21.3 21.3 21.2 21.2 21.2 21.1 21.1 21.1
130 21.1 21.0 21.0 21.0 20.9 20.9 20.9 20.8 20.8 20.8
131 20.7 20.7 20.7 20.6 20.6 20.6 20.5 20.5 20.5 20.4
132 20.4 20.4 20.4 20.3 20.3 20.3 20.2 20.2 20.2 20.1
133 20.1 20.1 20.1 20.0 20.0 20.0 19.9 19.9 19.9 19.8
134 19.8 19.8 19.8 19.7 19.7 19.7 19.6 19.6 19.6 19.5
135 19.5 19.5 19.5 19.4 19.4 19.4 19.3 19.3 19.3 19.3
136 19.2 19.2 19.2 19.1 19.1 19.1 19.1 19.0 19.0 19.0
137 19.0 18.9 18.9 18.9 18.8 18.8 18.8 18.8 18.7 18.7
138 18.7 18.7 18.6 18.6 18.6 18.5 18.5 18.5 18.5 18.4
139 18.4 18.4 18.4 18.3 18.3 18.3 18.3 18.2 18.2 18.2
140 18.2 18.1 18.1 18.1 18.0 18.0 18.0 18.0 17.9 17.9
141 17.9 17.9 17.8 17.8 17.8 17.8 17.7 17.7 17.7 17.7
142 17.6 17.6 17.6 17.6 17.5 17.5 17.5 17.5 17.4 17.4
143 17.4 17.4 17.3 17.3 17.3 17.3 17.3 17.2 17.2 17.2
144 17.2 17.1 17.1 17.1 17.1 17.0 17.0 17.0 17.0 16.9
145 16.9 16.9 16.9 16.9 16.8 16.8 16.8 16.8 16.7 16.7
146 16.7 16.7 16.6 16.6 16.6 16.6 16.6 16.5 16.5 16.5
147 16.5 16.4 16.4 16.4 16.4 16.4 16.3 16.3 16.3 16.3
148 16.2 16.2 16.2 16.2 16.2 16.1 16.1 16.1 16.1 16.0
149 16.0 16.0 16.0 16.0 15.9 15.9 15.9 15.9 15.9 15.8
7