Currently, plastic gaskets are used for steel, aluminum, and plastic windows and doors, and are usually used to install sealing materials between the glass and the windows and doors. Rubber and plastic gaskets are usually made of modified polyvinyl chloride material.
The performance of the gasket greatly affects the air tightness, water tightness, heat loss and other important performance indicators of the building's windows and doors as well as the solidity of the windows and doors. Therefore, the national standard GB12002-89 "Plastic Door and Window Gasket" was established early. In order to regulate the production and inspection of gaskets.
However, in the current construction materials market, the quality and price of rubber and plastic gaskets for doors and windows are confusing. The expensive ones are five to six thousand dollars per ton, while the cheap ones are six thousand dollars per ton. The price difference of nearly ten thousand dollars and the huge difference in quality is confusing. Many gasket manufacturers claim that their products meet the GB12002-89 national standard and can issue test reports recognized by authoritative agencies.
According to current samples of rubber and plastic gaskets from well-known manufacturers used in the industry and gaskets sent by relevant manufacturers, the results of the heating weight loss index in the hot air aging performance program were surprising: more than 10 samples , surprisingly, were not qualified. According to GB12002-89 standard, the heating weight loss index in hot air aging performance of gaskets should be ≤ 3. The actual test results for heating weight loss were: 7.17-22.54% far beyond the range of the national standard. This type of gasket is formulated from a large number of low boiling point plasticizers or plasticizer substitutes.
When this gasket was new, its flexibility and softness remained very good. However, over time, as the plasticizer evaporates more, the elasticity and flexibility of the gasket will deteriorate, which will affect the sealing performance of the window or door and the solidity of the window or door assembly.