... NSF certificate 5.OEM FASA Stone(quartz stone) is synthesized with high purity acid-washed quartz stone(93%),high polymer material( ... unit to fix thickness,grind and polish.93% content of quartz stone ensures its hard and compact structure with excellent even ... ) is widely used for kitchen countertops, solid surface,quartz tile,quartz countertops,floor, wall, bathroom, windows, bars, furniture and so on ...