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Concentrate powder quality inspection method

May 17 2017 · ASTM test method D 3363 allows the use of pencils of known hardness to be moved over the surface of the test sample at a fixed angle and pressure to perform the test As you may well be aware pencils come in a hardness range with a ‘B’ pencil being the softest category and ‘H’ pencils being the hardest With good quality powder

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