... -150mm, 3.Duration of use 50years, 4.Rock wool density 120kg/m3 rock wool sandwich panel are with good quality,easy installation ... -proofing and damp-proofingThe panel has aluminum coated zinc board in exterior, and the plug in the panels connecting ... .Application:it is widly used as roofing material for steel structure plant, gym, Supermatet ,commercial and civilian facilities. Rock wool panel