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1. Brief:PU handmade sandwich panel is a structure made of three layers: low density polyurethane inserted in between two relatively thin skin layers.This composite panel setup allows to achieve excellent mechanical performance at minimal weight. The polyurethane sandwich panel can be used as a interior wall sandwich panels,exterior composite wall panels..etcPolyurethane hand made panel bond strength is not less than 0.09 MPa, sandwich board combustion performance achieve B1 level, flexural bearing capacity of sandwich board deflection for Lo / 200 (Lo), the distance between bearings, sandwich