... and non-porous. 1. Our quartz stone is synthesized with high purity acid-washed quartz stone(87-93%),high polymer material ... thickness,grind and polish.4. 87%-93% content of quartz stone(depend on colors) ensures its hard and compact structure ... penetration etc.6. Our quartz stone is widely used for quartz countertops, quartz tiles,quartz solid surface,man-made stone,floor, wall, bathroom, windows, ...