It points out that it has both ecnomical effect and social effect to produce cast iron pipe with cement mortar lining with bitumen coating and this product is welcome by the market.

• 铸铁管内衬水泥外涂沥青是当前生产输水铸铁管最现实有效和经济的防腐方法,产品受到市场欢迎;生产水泥内衬铸铁管具有良好的经济效益和社会效益,切实可行。