... sandwich board 1.Screw concealed 2.High wave for good draining 3.Four wave make fastness perfect 4.Low cost and economical sandwich ... high durability, and weather fastness, etc.2. The sandwich panel has excellent insulating performance: heat insulation, sound ... EPS sandwich panels, Wiskind also offers rock wool sandwich panels, glass wool sandwich panels, PU sandwich panels, honeycomb sandwich panels. ...