Compression strength,245-254kg/mm2 Flexible grinding capacity,1.27-1.47N/mm2 INSTRUCTIONS FOR GRANITE SURFACE PLATEA. Description of granite surface Adopting high quality “Jinan Qing” natrual mateirial of granite, granite surface plate is manufactured by mechanical processing and manual lapping. It dosen't only own the advantages of black gloss, precise construction,even character, nice stability ...