Rock wool sandwich polyurethane seal on both sides give full play to the unique properties of rock wool core material in fire protection, thermal insulation, acoustic insulation and other aspects have a significant effect; while retaining polyurethane plastic, airtight, high-strength, non-absorbent advantages. The advent of this material is a revolutionary building works changing rock wool composite board construction, making the polyurethane, the advantages of rock wool have been fully converged, reject the existence of the shortcomings of traditional sheet. In a sense, rock wool composite panels installation, rock wool sandwich panel Polyurethane bilateral seal can not be compared with ordinary wool sandwich. Sandwich panels is currently in a common building material products, not only can be a good fire-retardant insulation and environmentally efficient. Color steel sandwich panel has two layers of metal panels and middle polymer insulation core repression. It has the ease of installation, light weight and environmentally efficient. And closed-cell molecular structure filling system can prevent moisture condensation.