13
Usually, test 5 times on each measure area of sample. The data dispersion should not be more than
mean value±15HL
；
The distance between any two indentations or from the center of any indentation to the edge of tested
sample should conform to the regulation of table 6
；
Table
6
Distance between any two
indentations
（
mm
）
Indentation to the edge of tested
sample
（
mm
）
≥
3
≥
5
For special material, if accurate conversion from the Leeb hardness into other hardness method is
wanted, contrastive test must be done to get conversion relations. Use inspected qualified Leeb hardness tester
and corresponding other hardness tester to test at same sample respectively. For each hardness value, measure 5
Leeb hardness values. using Leeb hardness arithmetic average value and corresponding hardness method
average value as correlative value to make individual hardness contrastive curve
，see
figure 3.
