After two kinds of flame retardant TCEP and DMMP complex with different proportions, better than a single flame retardant, when TCEP: DMMP = 1: 2 (mass ratio), oxygen index of the foam at the same time to meet the ultra-high molecular polyethylene manufacturers, other physical properties are better. Adjusting the isocyanate index of 3, plus three polymerization catalyst, the obtained flame retardant polyurethane foam of oxygen index of 32, to GB 8624-1997 "burning of construction materials classification method performance in" BI class (flame retardant grade) under the . Robust: surfaces using high-quality color-coated steel, the core material with high quality rock wool, glass wool, hydrophobic rate, fire cotton rotated 90 degrees so that the cotton fibers and the board into a vertical state, enhanced compression tension more than 50% strength; high density core material enables better thermal performance (rock wool core material density ≥120kg / m, wool density ≥64 kg / m) ultra-high polyethylene sheet, superb strength polymer polyethylene board manufacturers, lasting solid. Facade appearance: screw hidden node design Supply of high polyethylene plate, rich variety of hidden nail design, board flatness, paint coating color, color of lasting, can meet the needs of different shapes.