The basis of measurement of hardness with durometer is that pressed plate ( indentation plate ) of durometer held with both hands is vertically pressed from the top in a fixed velocity on the flat plate of tested material set on a flat table and immediately after that, indicated maximum figure is read. That figure shows “hardness”.
Basic condition for measurement as standard is ruled in common with as below.
1.As to measuring position, it is to be inside from the edge of tested material by 12mm and above. The distance is to be away by 6mm and above.
2.Thickness of tested material is normally 6mm and above . Type E is 10mm and above.
3.Hardness is to be the middle of 5 points or its average.
4.In case measured result is 50°by Type A, “A50” is indicated.
5.Test condition : temperature 23+- 2 humidity 50 +-5%.
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