The following international standards are used by the NG-1000 Micro Vickers and Knoop Hardness Tester: ISO 6507 and ASTM E-384.

For the three separate test force ranges for metallic materials, including hard metals and other cemented carbides, ISO 6507 specifies the Vickers hardness test technique. As a function of the test force, the Knoop indenter does not create an indentation that is geometrically equivalent. Under the same test conditions, the indentation depth for a Knoop indentation is shallower than for a Vickers indentation because of its rhombic shape. The Knoop indenter can therefore be particularly helpful for assessing thin coatings or hardness gradients on sectioned samples.

The accepted test procedure for determining a material’s Knoop and Vickers hardness is ASTM E384. Test loads normally vary from 100 to 500 grams but can be as low as 1 gram and as high as 1,000 grams. At all test forces, the Vickers indenter often creates an indentation that is geometrically comparable. The list of requirements that adhere to our A2LA and ISO accreditation is provided below.

• Knoop: 100, 500 HK
• Vickers: 100g, 300g, 500g, 1000g HV
• ASTM E384
• ASTM F606
• ASTM F606M

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