... gloss, precise construction,even character, nice stability, high strength and hardness, but also no rust, acid&alkali-proof, no magnetization, type ... granite can still retain even character, stable, high strength and hardness, and can keep high precision at heave duty. It is ... linear expansion,4.6×1-6℃ Water absorption 0.13% Shore hardness HS, more than 70。 Precision has 000. 00, 0, 1 ...