Many substances have their hardness values, so what is the surface hardness value of acrylic board? What's the hardness of it? Generally speaking, it is expressed with H value, generally refers to its surface resistance to scratch, the surface of the ordinary acrylic plate can only reach about HB~1H, through the surface hardening of the acrylic plate can be promoted to 4H~6H. The higher the H value, the higher the surface hardness of the object. If we commonly use the Chinese pencil, it will be labeled with 4B and 5B according to the hardness of the pen core.
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