The A1 non combustible tunnel fireproof board produced by Shijiazhuang Chenxing Industrial Co., Ltd. is made of natural mineral vermiculite, which is expanded at high temperature, added with high-temperature adhesive, and pressed into a board. The expanded vermiculite itself is an insulation, fireproof, and thermal insulation material. The thinnest can reach 12MM, the thickest can reach 60MM, the widest can reach 1000MM, the longest can reach 2000MM, and densities ranging from 450-900KG/cm3 can be produced. This board has a certain strength and can meet the requirements of punching and slotting.
For example, the room temperature compressive strength of 50MM is 4.23MPa, the density is 679KG/cm3, the heating permanent line change is -12.4%, the thermal conductivity of the hot surface at 200 ℃ is 0.100 W/(m · K), the thermal conductivity of the hot surface at 400 ℃ is 0.135W/(m · K), the thermal conductivity of the hot surface at 600 ℃ is 0.154 W/(m · K), the thermal conductivity of the hot surface at 800 ℃ is 0.162W/(m · K), and the fire resistance is 1150 ℃.
