BY-1000g Pencil Hardness Tester's video
NBCHAOVIDEO144 plays · · 2018-12-11
PUSHEN BY-1000g Pencil Hardness Tester Load 1000g, Pencil Hardness Tester experiment, that is, use graphite pencils with different Hardness values to evaluate coating Hardness. Conform to standard GB/T 6739 ISO 15184
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