... , lightweight , anti-seismic,convenient construction, sound insulation and lower noise PU wall sandwich panel 1) Intruduction :"It is composed of three ... processing,2) the inter-layer is the rigid high-density PU foam thermal insulation layer with fire-retardant treatment , 3) the ... *380*16mm3, Package : 1.444sqm / pc 8pcs /carton exterior wall PU wall sandwich panel