... absorption anti-corrosion, fungi,rot,chemical FRP as skin panel on both sides, PP honeycomb as core. They are ... panel are light weight, high stiffness, sound damping, fire-retardnat,quakeproof, insulation, environmental friendly. They are applicable to the apartments and external ... to above. Commonly in practice composite panel thickness from 15mm to 40mm. Sandwich panel is widely applied in Marine as ...