Marble platform with high accuracy precision parameter American National Standards marble platform flatness tolerance according to: GB4987-85 Standard: 000 = 1 × (1 + d / 1000) um marble platform Dachang Series (8) 00 = 2 × ( 1 + d / 1000) um 0 级 = 4 × (1 + d / 1000) um 级 1 = 8 × (1 + d / 1000) um (d diagonal mm) (measured temperature is usually 21 ± 2 ℃ ) and the specific gravity of the marble flatness flatness tolerance edited by: GB4987-85 Standard: 00 = 2 × (1 + d / 1000) um 0 级 = 4 × (1 + d / 1000) um1 level = 8 × (1+ d / 1000) um (d diagonal mm) (measuring temperature is generally 21 ± 2 ℃ marble slab gravity: 2970-3070kg / m compressive strength: 245-254N / m linear expansion coefficient: 4.61 × 10-6 / ℃, water absorption: <0.13% Shore hardness:. Hs70 above Xiangyu Hardware Machinery, Jinan Green marble detection platform, Pinghu marble platform provided by Shenzhen Baoan District Songgang Xiangyu Hardware Machinery Firm Bao'an District of Shenzhen City Songgang Cheung. Yu Hardware Machinery Firm (www.xywj1818.wjw.cn) (www.xywj1818.wjw.cn/) is specialized in the "shelves, mold frame, gantry frame, table, table lines, tools, cabinets, tools, vehicles," the enterprise the company of "honesty, hard service" concept, to provide you with the highest quality products and services are welcome to inquire Contact:! Huang Yongdong.