How to identify quartz stone quartz stone is good or bad four, the standard authentication quartz stone as identification standard quartz stone: 2, density: 2.37-2.5 3, temperature: can be temperature 300 ℃. It does not change color after using a stainless steel cup filled with boiling water 30 minutes into the table. Or with a lighted cigarette butt on the quartz stone quartz stone, not color. How to identify quartz stone quartz stone is good or bad four, the standard authentication of quartz as a standard quartz stone identification: 13, Brightness: use light meter to detect more than 60 degrees. 14, exterior appearance: perfectly clear not cloudy. Color uniformity. Flatness: within 3000㎜ ± 0.5 mm; thickness: 12 mm ± 0.5 mm plate, 15 mm plate ± 1 mm, 20 mm ± 1.5 mm plate. Quartz | Quartz Kai Sa | Kai Sa Building Materials (certified merchants) provided by the Dongguan City Kai Sa Building Materials Co., Ltd. Dongguan Kai Sa Building Materials Co. (www.kaisa-stone.com) is specialized in "stone, precast concrete," the business, the company adhering to the "honesty, hard service" concept, to provide you with the highest quality products and services . Welcome to inquire! Contact: Mr. Hu.