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What impact do inferior sealing gaskets have on products?
Published Time:
2021-01-26
What impact do inferior sealing gaskets have on products?
Currently, plastic sealing gaskets are used in steel, aluminum alloy, and plastic doors and windows, typically installed between the glass and the frame as a sealing material. Rubber and plastic sealing gaskets are usually made of modified polyvinyl chloride (PVC).
The performance of sealing gaskets significantly impacts the airtightness, water tightness, heat loss, and other crucial performance indicators of building doors and windows, as well as the structural integrity of the door and window units. Therefore, the national standard GB12002-89 "Plastic Door and Window Sealing Gaskets" was established early on to standardize the production and inspection of sealing gaskets.
However, in the current building materials market, the quality and pricing of rubber and plastic sealing gaskets for doors and windows are confusing. Expensive ones cost five to six thousand yuan per ton, while cheaper ones cost around six thousand yuan per ton. The price difference is nearly ten thousand yuan, and the quality difference is substantial, causing confusion. Many sealing gasket manufacturers claim their products meet the GB12002-89 national standard and can provide test reports certified by authoritative institutions.
Based on the rubber and plastic sealing gaskets from well-known manufacturers currently used in the industry and samples provided by related manufacturers, the results of the heating weight loss index in the hot air aging performance test are surprising: Out of more than 10 samples, none qualified unexpectedly. According to the GB12002-89 standard, the heating weight loss index for sealing gaskets in hot air aging performance should be ≤3. The actual test results for heating weight loss were 7.17-22.54%, far exceeding the national standard. This type of sealing gasket is formulated with a large amount of low-boiling-point plasticizers or plasticizer substitutes.
When these gaskets are new, their elasticity and softness are still very good. However, as time passes and more plasticizer evaporates, the elasticity and softness of the gasket will deteriorate, affecting the sealing performance of the doors and windows and the structural integrity of the door and window components.
Keywords:
Seal gasket
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