Chen Yu Building Materials Technology Co., Ltd. of Guizhou, Guiyang City is located in Sha Chong Road. The main production and sale of the tunnel fire retardant paint, bridge deck waterproofing materials, perlite, vermiculite, wall insulation mortar. Eight hundred million total investment, the existing staff of 65. 4 of them full-time research staff, 12 people intermediate professional titles, hired a well-known experts and professors. Specializing in the development of high-tech materials, a professional production equipment and construction teams. DC-SD Tunnel 21mm thick fire-resistant coating in the coating, the fire resistance of 3.0h, the bond strength 0.3Mpa, GA 98-2005 prestressed concrete floor above the fire-resistant coating 0.1Mpa requirements.