Synthetic quartz quartz quartz stone surface smooth, no scratches stranded quartz structure, dense non-porous material structure allows bacteria nowhere to hide, the material produced by the US NSF certification, direct contact with food Kai Sa quartz completely non-toxic. We use a selection of natural stone crystalline mineral, SiO2 content of more than 99.9%, and in the manufacturing process to the complex characteristics of purified quartz quartz stone and have a reason for this feature, do not spend quartz scratch its quartz content of up to 94 %, quartz is the nature of natural mineral hardness only to diamond, its high surface hardness of Ta Mok's hardness 7.5, much larger than those used in kitchen knives and other sharp shovel, it will not be scratched. Dongguan quartz _ _ quartz stone building materials provided by Kai Sa Sa Building Materials Co., Ltd., Dongguan City, Kai. Building Materials Co., Ltd., Dongguan City, Kai Sa (www.kaisa-stone.com) strong, credible, in Dongguan, Guangdong sandstone industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving Kai Sa innovative ideas will lead into the glorious building materials and you work for a better future!