The difference between the quality of the sealing strip

The performance of the sealing strip greatly affects the air tightness, water tightness, heat loss and other important performance indicators of doors and windows of building doors and windows, as well as the firmness of doors and windows.To this end, the state has long formulated the national standard GB12002-89 "Sealing Strips for Plastic Doors and Windows".To standardize the production and inspection of sealing strips.

However, the quality and price of rubber-plastic sealing strips for doors and windows in the current building materials market are very confusing.The expensive ones are 15,000 or 6,000 yuan per ton, while the cheaper ones are only 6,000 yuan per ton.The price difference is nearly 10,000 yuan, and the quality difference is very large, which makes people at a loss.Many sealing strip manufacturers say that their products implement GB12002-89 national standards and can issue test reports that are qualified by authoritative institutions.According to the testing of rubber and plastic sealing strips from well-known manufacturers currently in use in the industry by our sealing strip Co., Ltd., as well as samples of sealing strips sent by relevant manufacturers, the results of the heating weightlessness index in the hot air aging performance project are surprising: there are more than 10 samples, but none of them are qualified.

In accordance with the provisions of the GB12002-89 standard, the heating weightlessness index in the hot air aging performance project of the sealing strip should be ≤3%.The heating weightlessness of the actual test results is: 7.17%~22.54%.It is far beyond the scope of national standards.

For such sealing strips, a large number of low-boiling plasticizers or substitutes for plasticizers are added to the formula.When such a sealing strip is new, its elasticity and softness are still very good.However, over time, the plasticizer evaporates for a long time, and the elasticity and softness of the sealing strip deteriorates. Lightness affects the sealing performance of doors and windows, and heavyness affects the firmness of door and window assembly.

In addition, sealing strips with excessive plasticizer content will migrate from the plasticizer to the polyvinyl chloride profile in contact with it during use.It causes local coloring and swelling of the frame fan profile.That is: on the sealing surface of the profile in contact with the sealing strip, there is a dark color spot of varying width and width that cannot be wiped off or washed off, which forms a strong contrast with the white profile body, which greatly affects the aesthetics.At the color trace, it is partially raised due to the migration of plasticizers.(Sliding doors and windows are not exposed due to the contact between the sealing strip and the profile, and the local coloring and swelling of the profile are generally not observed under normal circumstances.When the casement doors and windows are in the open state, the sealing strip is out of contact with the corresponding profile, and the local coloring and swelling of the profile are exposed.) Although the partial coloring and swelling of the profile will not cause serious consequences of the failure of the frame and fan profile, it seriously affects the appearance of plastic doors and windows.This is a defect after all, after all, it will have an extremely bad impact on the image of plastic doors and windows.