quality of the waterproof membrane is the old problem. In the previous checks, these two indicators have been to occupy a prominent position of nonconforming items. Such as September 2009 announced the results of national supervision and spot checks show that 167 companies nationwide production of 168 kinds of building

waterproofing membrane a total of 24 kinds of products failed, of which two indicators of substandard products there are 11, accounting for unqualified 45.8% of the product. Over the past decade, the state vigorously promote new building waterproof materials, constantly eliminated, limiting backward technology products. It is

reasonable to say that the quality of building waterproofing should be greatly improved, why the last sampling there are so many substandard products? China Film Industry Association expert Liu Zhi believes that the above problems, mainly because of strong market demand for production, small business illegal production, end users and