意大利ETRY500型高速列车大量采用不同厚度和不同形状的酚醛塑料预制夹层板制做隔墙、车门、通过台、电话间、贮藏室的顶棚和一等客车的座椅支架。对这种预制件的设计和安全要求是外形需有圆角、凹缝无压条、重量轻、安全防火和机械强度高。这种预制件的外层为阻燃聚碳酸酯,内层为薄的铝合金板或二次热注聚碳酸酯壳,中间是用长玻璃纤维增强的泡沫酚醛塑料。塑料的注入是为了提高刚度和结构强度,满 Italy ETRY500 high-speed trains use a large number of different thickness and different shapes of phenolic plastic prefabricated sandwich panels made of partitions, doors, through the Taiwan, telephone booths, storerooms and first-class passenger car seat brackets. The design and safety requirements for such prefabricated parts are rounded, indentations, light weight, safe fire and high mechanical strength. The prefabricated outer layer is a flame-retardant polycarbonate, the inner layer is a thin aluminum alloy plate or a secondary thermoformed polycarbonate shell, and the middle is a foam phenolic reinforced with long glass fibers. Plastic injection is to increase stiffness and structural strength, full