2004年5月,海关总署和国家发改委正式对轮胎加工贸易天然橡胶的单耗标准(以下简称轮胎单耗标准)进行修订。修订力度很大,一是进一步细分了轮胎种类,二是各种轮胎种类的含胶率和工艺损耗率都大幅度下降,其中下降幅度最大的是轿车半钢丝子午线轮胎,含胶率由原来的56％调低到35％。 In May 2004, the General Administration of Customs and the National Development and Reform Commission formally revised the standard for the consumption of natural rubber for tire processing trade (hereinafter referred to as tire consumption standard). The revision efforts are very large. First, the types of tires have been further subdivided. Second, the rate of rubber and process wear of various types of tires has dropped significantly. The largest decline has been in passenger car semi-wire radial tires. The 56% was lowered to 35%.