... : good fire-resistance, noise-absorbing 2.fire resistance rating: A Rock Wool Composite panelSpecification:1. External / Internal steel panel: Thickness: 0.4mm ... , stainless steel with brushed, mirrored, PVC film2. Core material: Type: Rock wool. Density: 120-150 kg/m3 Thickness: 40 mm-250 mm3 ... , Shanghai, ChinaTel: 86-021-37829166Fax: 86-021-37829177Mbl:86-13671913456 Rock Wool Composite panel