... ,transportation and other industries. Ideal material for heat insulation and sound insulation of industrial facilities such as tank,boiler,flue ,heat ... -strength rock wool board :used for heat preservation,fireproofing and sound absorption for the building wall/roof, such as curtain wall , inner ... wool felt≤1Rock wool pipe≤3.5Hydrophobicity(%)>98Tally with GB5480 Sound Absorption Rock Wool Board