Plumbers are steadily switching from copper pipes to plastic ones; and the Chinese have found a way of substituting the metal with cheaper aluminium in air-conditioning units.
水管工们已逐渐用塑料管代替铜管，中国也已用更便宜的铝代替空调元件。
2
Used for the waterproof sealing on concrete wall panel slab ventilation pipes the light weight panel products window and doors of metal products asbestos boards gypsum board wood plastic etc.
用于混凝土墙板、板、风管道的防水密封，金属制品、棉板、膏板、料等轻型板材和门窗的防水、封。
3
Used for the waterproof sea ling on concrete wall panel slab ventilation pipes the light weight panel products window and doors of metal products asbestos boards gypsum board wood plastic etc.