NEN-EN-ISO 11127-4
Preparation of steel substrates before application of paints and related products - Test methods for non-metallic blast-cleaning abrasives - Part 4: Assessment of hardness by a glass slide test
| Organization: | NEN |
| Publication Date: | 1 September 1997 |
| Status: | inactive |
| Page Count: | 14 |
| ICS Code (Paint coating processes): | 87.020 |
scope:
The procedure includes examining a small quantity of the sample under the microscope and, if grains of different colours or diameter are present, selecting a few grains of each, placing the selected grains between two glass microscope slides and, whilst applying pressure, slowly moving one slide over the other with a reciprocating motion for 10 s, examining the glass surfaces for scratches. The object of the method is to assess whether the sample has a minimum hardness of 6 on Mohs' scale.
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