防水材料的质量好坏，是能否搞好防水工程的基础。而目前国内的防水材料的品种、规格较多，产品质量各异，而目前国内的防水材料市场又比较混乱，不少劣质防水材料充斥市场，如将不合格的防水材料使用到防水工程上，必将严重降低防水工程质量。
The quality of waterproof materials is the basis of whether to do a good job in waterproof engineering. At present, there are many varieties and specifications of waterproof materials in China, and the product quality is different. At present, the domestic waterproof material market is relatively chaotic, and many low-quality waterproof materials flood the market. If unqualified waterproof materials are used in waterproof engineering, the quality of waterproof engineering will be seriously reduced.
以纸胎油毡和防水涂料质量情况来分析，可以看出：
By analyzing the quality of paper-based linoleum and waterproof coating, it can be seen that:
1.石油沥青纸胎油毡中的原纸质量下降。50年代的原纸中废旧布浆含量较多，并含有一定数量的粗毛，而现在多用废纸和草浆，使油毡的拉伸强度降低，延伸率减小，含水率增加，质量下降。
1. The quality of base paper in petroleum asphalt paper-based felt decreases. In the 1950s, the base paper contained a large amount of waste cloth pulp and a certain amount of coarse wool. Now, waste paper and straw pulp are mostly used, which reduces the tensile strength, elongation, moisture content and quality of linoleum.
2.原纸密实度增加，吸油率降低。浸油率由140％～160％下降到115％以上，由于沥青浸不透原纸，易造成油毡脱层、腐烂。
2. The compactness of base paper increases and the oil absorption rate decreases. The oil impregnation rate decreases from 140% ~ 160% to more than 115%. Because the asphalt cannot penetrate the base paper, it is easy to cause delamination and decay of the felt.
3.石油沥青质量不好。60年代以后，使用了含盖土网 防寒布 麻绳 油麻绳 麻刀 沥青麻绳 静压造型线 自动浇注机 铸铁拍门 钢制拍门 玻璃钢拍门蜡量、含硫量较多的国产石油沥青生产油毡，导致油毡老化性能差，易流淌和脆裂，且沥青中的石蜡具有迁移性，易使油毡防水层逐渐失去粘结力，造成防水层翘边、脱落。
3. The quality of petroleum asphalt is poor. After the 1960s, domestic petroleum asphalt with high wax and sulfur content was used to produce linoleum, resulting in poor aging performance, easy flow and embrittlement of linoleum, and the migration of paraffin in asphalt, which is easy to gradually lose the adhesion of linoleum waterproof layer, resulting in edge warping and falling off of waterproof layer.