The difference between the quality of the sealing strip
Jul 26,2024
Plastic sealing strips are currently the sealing material used to seal between the glass and the frame of the door and window. Rubber and plastic sealing strips are usually made of modified polyvinyl chloride materials.
The performance of the seals greatly affects the air tightness, water tightness, heat loss and other important performance indicators of the doors and windows of the building, and the firmness of the doors and windows. For this reason, the country formulated the national standard GB12002-89 "Sealing Strips for Plastic Doors and Windows" very early. To standardize the production and inspection of sealing strips.
However, the quality and price of rubber and plastic sealing strips for doors and windows in the current building materials market are very confusing. The expensive one is fifteen to six thousand yuan per ton, and the cheap one is only six thousand yuan per ton. The price difference is nearly 10,000 yuan, and the quality difference is huge, making people confused. Many sealing strip manufacturers claim that their products are in compliance with the GB12002-89 national standard and can issue test reports qualified by the authority. According to our Xingtai Zhongxin Sealing Strip Co., Ltd.'s testing of the rubber and plastic sealing strips of well-known manufacturers currently in use in the industry, and the sealing strip samples sent by related manufacturers, the results of the heating weight loss index in the hot air aging performance project are impressive Surprised: There are more than 10 samples, but none of them are qualified.
According to the GB12002-89 standard, the heating weight loss index in the hot air aging performance of the sealing strip should be ≤3%. The actual heating weight loss is: 7.17% to 22.54%. Far beyond the scope of national standards.
Such sealing strips are formulated with a large amount of low-boiling plasticizers or plasticizer substitutes. When this kind of sealing strip is new, its elasticity and softness are still very good. However, when the plasticizer volatilizes over a long period of time, the elasticity and flexibility of the sealing strip will become poor, which will affect the sealing performance of doors and windows, and the firmness of the assembly of doors and windows.
In addition, the sealing strip with too high plasticizer content will also migrate to the PVC profile in contact with it during use. Cause local coloring and swelling of the frame fan profile. Namely: On the sealing surface of the profile that is in contact with the sealing strip, there appears a dark stain that is different in width and cannot be wiped off or washed off, which forms a strong contrast with the white profile body, which greatly affects the appearance. Because of the migration of plasticizer, the stains are partially raised. (Since the part of the sliding door and window contacting the profile is not exposed, local coloring and swelling of the profile are not observed under normal circumstances. When the flat door and window are open, the sealing strip is out of contact with the corresponding profile, and the profile is partially colored and The swelling phenomenon is fully 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, it will have an extremely bad impact on the image of plastic doors and windows.
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