Some of the stone under high temperature, chemical decomposition occurs. (1) Gypsum: decomposition at greater than 107 ℃. (2) limestone, marble: decomposition at greater than 910 ℃. (3) granite: at 600 ℃ due to uneven heating and cracked mineral composition. Sesame white board stock a large number of low-cost treatment to burn as follows: 300 * 600 * 2.5: 37 yuan / square, 300 * 600 * 50: 45 yuan / square. Curb: 800 yuan / cubic Order. Phone: 15836992808 road calculus http://www.nyzfsy.com