... Polyurethane foaming with fire-retardant treatment, and the back material is fiber foil paper.Product FeaturesSince Tenghui Siding itself ... , water-proof and fire-retardant, lightweight anti-seismic, convenient construction, sound insulation and lower noise, environment friendly, and lasting ... : 16 mmWidth: 375 / 385 mmLength: 3800 – 4000 mm construction material---Small Brick Series