How to identify quartz stone quartz stone is good or bad two, relatively Beverly quartz stone quartz stone and abroad 1. Appearance: A, Gloss: Beverly quartz Dan Guangze degree above 60 degrees, Foreign quartz at about 45 degrees ; B, smoothness: Beverly Long quartz stone is not particularly smooth quartz plate, hand touch feeling hanging surface quartz countertops, quartz abroad quite smooth, silky characteristics such as quartz and quartz stone have this feature 5 reasons, smooth surface use non-toxic radiation quartz stone quartz stone, smooth and minimalist also marks residence quartz stone, dense non-porous material structure makes the bacteria can not hide, the material produced by the United States NSF certification, direct contact with food , completely non-toxic! Quartz structure | Kai Sa Building Materials (certified) | quartz provided by the Dongguan City Kai Sa Building Materials Co., Ltd. Dongguan Kai Sa Building Materials Co. (www.kaisa-stone.com) is Dongguan, sandstone leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Kai Sa leader in building materials with the staff warmly welcome all inquiries negotiations to create Kai Sa Building Materials better future.