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聚氨酯预制直埋保温钢管防水防腐耐老化
聚氨酯保温管防水、防腐、耐老化：由于聚氨酯泡沫的密闭孔隙率在92%以上，采用聚氨酯泡沫作为直埋管道的保温层，不仅可以保温，而且能有效地防止水、湿气等腐蚀性液体和气体的浸润
直埋式预制保温管聚氨酯预制直埋保温管聚氨酯泡沫塑料预制直埋管55/263
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