So, polystyrene foamed plastic and polyurethane hard foam to the flame retardant function to ensure the whole system how much the fire prevention safety?
那么，聚苯乙烯泡沫塑料和聚氨酯硬质泡沫材料的阻燃机能达到何等程度才能保证整个体系的防火安全？
2
The result showed the flame retardant PU foam had good fire retardancy, and the optimum addition content of V6 was 20%.
实验发现，阻燃剂V6对聚氨酯泡沫塑料有较好的阻燃效果，最佳添加量为20%。
3
Physical properties like mechanical, fireretardant and aging properties et al and applications of rigid polyurethane foam are reviewed.