... rock wool insulation color steel sandwich panel is the main raw material in the basalt and other natural ore, high temperature melt ... processing made. It’s the most similar (sandwich panel series) in refractory performance of a new type of fire protection board ... board fire resistance rating of 0/1 the (fire graded in turn divided into 0, 1, 2, 3, 4, 5).Ⅲ Application ...