Metallic materials. Knoop hardness test - Test method1 Scope This document specifies the Knoop hardness test method for metallic materials for test forces from 0,009 807 N to 19,613 N. The Knoop hardness test is specified in this document for lengths of indentation diagonals 0,020 mm. Using this method to determine Knoop hardness from smaller indentations is outside the scope of this document as results would suffer from large uncertainties due to the limitations of optical measurement and imperfections

BS EN IEC 60268‑21 is the 21st part of the BS EN IEC 60268 multi-series that focuses on sound system equipment

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