1.EPS PU rockwool ,metal. 2. cheap, economical building material 3.used for dorm, office, warehouse, fence, factory,workshop Esp heat insulation sandwich is a super-light-construction plates made of both the thickness 0..3-0.75mm,Coated steel plate taken as the surfacingmaterial an pressurized to be recombined in the continuous shaping machine with a hot hardening glue,light in the deadweight(1/ ...