pencil hardness hardness

pencil hardness hardness, Total:3 items.

In the international standard classification, pencil hardness hardness involves: Paints and varnishes.

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, pencil hardness hardness

• GB/T 6739-1996 Determination of film hardness by pencil test
• GB/T 6739-2022 Paints and varnishes—Determination of film hardness by pencil test
• GB/T 6739-2006 Paints and varnishes-Determination of film hardness by pencil test

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