Seal is now more common among our lives a product, and the choice of high-quality sealing strips are very important for everyone, so how to choose quality seal it.
  Seal performance will for important performance indicators and the firm level airtight, watertight, heat loss and other vehicles, car doors and windows have a greater impact. Therefore, China has long developed a GB12002-89 "car with a sealing strip" the national standard. To regulate the production and inspection seal. 
   However, the building materials market automotive quality and price rubber sealing strip is very confusing. Expensive fifteen thousand, six thousand yuan a ton, cheap only six thousand dollars a ton. Nearly million price difference, quality varies greatly, as people know what to do. Many seal manufacturers are saying the product is the implementation of GB12002-89 national standards and can issue authorities detected qualified test reports. Based on the detection of well-known manufacturers in the industry we are currently using the rubber seal, and seal the manufacturers sent samples were heated weightlessness indicator results of its hot air aging properties of the project surprising: more than 10 samples, Actually no one is qualified. 
  According to GB12002-89 standards, seal hot air heat aging performance of the project in weightlessness indicators should ≤3%. The heating weight loss of actual test results: 7.17% - 22.54%. Far beyond the scope of national standards. 
  Such a seal, in the formula by adding a large number of low-boiling plasticizer or plasticizer substitutes. Such a seal when new, elasticity, softness are still very good. However, over time, when more volatile plasticizer, seal elasticity, softness variation, ranging from the impact the sealing performance of doors and windows, while also affect the degree of solid doors and windows assembly.
  In order to better play the role of the seal, so that customers really appreciate the sealing strips to bring help, as seal manufacturers should produce truly qualified seal.