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Full Description

This document specifies the Knoop hardness test method for metallic materials for test forces from 0,009 807 N to 19,613 N

This document specifies Knoop hardness tests for length of the long diagonal 0,020 mm. Using this method to determine the 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 in tip geometry.

The Knoop hardness test specified in this document is also applicable for metallic and other inorganic coatings including electrodeposited coatings, autocatalytic coatings, sprayed coatings and anodic coatings on aluminium. This document is applicable to measurements normal to the coated surface and to measurements on cross-sections, provided that the characteristics of the coating (smoothness, thickness, etc.) permit accurate readings of the diagonal of the indentation. This document is not applicable for coatings with thickness less than 0,007 mm when testing normal to the coating surface. This document is not applicable for coatings with thickness less than 0,020 mm when testing a cross-section of the coating. ISO 14577-1 can be used for the determination of hardness from smaller indentations.

A periodic verification method is specified for routine checking of the testing machine in service by the user.
 

Document History

  1. ISO 4545-1:2023

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    Metallic materials - Knoop hardness test - Part 1: Test method

    • Most Recent
  2. ISO 6507-1:2018


    Metallic materials - Vickers hardness test - Part 1: Test method

    • Historical Version
  3. ISO 4545-1:2017


    Metallic materials - Knoop hardness test - Part 1: Test method

    • Historical Version
  4. ISO 6507-1:2005


    Metallic materials - Vickers hardness test - Part 1: Test method

    • Historical Version
  5. ISO 4545-1:2005


    Metallic materials - Knoop hardness test - Part 1: Test method

    • Historical Version
  6. ISO 4516:2002


    Metallic and other inorganic coatings - Vickers and Knoop microhardness tests

    • Historical Version
  7. ISO 6507-1:1997


    Metallic materials - Vickers hardness test - Part 1: Test method

    • Historical Version
  8. ISO 4545:1993


    Metallic materials - Hardness test - Knoop test

    • Historical Version
  9. BS 427:1990


    Method for Vickers hardness test and for verification of Vickers hardness testing machines

    • Historical Version
  10. BS 427-2:1962


    Method for Vickers hardness test-Verification of the testing machine

    • Historical Version
  11. BS 427-1:1961


    Method for Vickers hardness test-Testing of metals

    • Historical Version