1.natural,non-deformable,non-asbestos 2.The fireproof grade is A 3.high bending/compressive strength 4.Xinjiang vermiculite. 1100degree Vermiculite slabs in fireplace characteristics: 1. The fireproofing grade is A grade, under the circumstances of 1000 centigrade degrees after one hour. 2. When the vermiculite board(brick) face to fire or high temperature circumstance, it is non-deformable. 3. ...