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Laboratory > Hardness and Scratch > Buchholz Hardness Tester | Elcometer 3095 >

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Buchholz Hardness Tester | Elcometer 3095

Measuring a coating's hardness using the indentation method, the Elcometer 3095 Buchholz Hardness Tester consists of a beveled disc indenting tool which is fitted into a stainless steel block exerting a constant test load of 500g (17.6oz).

The gauge is placed on to the coating for 30 seconds and the length of any subsequent indentation in the coating is measured using the graduated microscope. The result is expressed as units of Buchholz Indentation resistance using the scale printed in the operating instructions.

Measure of Buchholz Hardness
Indentation Depth		Indentation Resistance	Indentation Depth		Minimum coating thickness for which a measurement is valid
µm	mm		µm	mils	µm	mils
20	0.8	125	5	0.2	15	0.59
21	0.85	118	6	0.24	20	0.79
23	0.9	111	7	0.28	20	0.79
24	0.95	105	7	0.28	20	0.79
25	1.0	100	8	0.31	20	0.79
38	1.05	95	9	0.35	20	0.79
28	1.1	91	10	0.39	20	0.79
29	1.15	87	11	0.43	25	1
30	1.2	83	12	0.47	25	1
33	1.3	77	14	0.55	25	1
35	1.4	71	16	0.63	30	1.18
38	1.5	67	18	0.71	30	1.18
41	1.6	63	21	0.83	35	1.38
43	1.7	59	24	0.94	35	1.38