Polyurethane sandwich panel is one  type of building material witch using one side colored steel sheet or thick steel sheet as outer skin side, fireproof polyurethane foaming with noiseabsorbing , it is adhere to the outer steel and inner steel sheet. All panel are double skinned panels and injected between with high efficency Polyurethana foam insulation matarial witch give maximum thermal insulation and attenation to brek out sound.