... 2.ISO9001:2000,ISO14001:2004 Sand rock is a type of high quality natural rock without light pollution or radiation hazard ... %;C.goethite around 18%;D.miscellaneous over 10%Sand rock,sound insulation,moisture absorption,no weathering outside,no dissolving ... 's request2Thickness≥2mm3Usagefor walls,carved board,artistic vase,sculpture&fountain,style fireplace,Roman pillar,door and window frame,etc. ...