With excellent sealing performance, flame retardant sealing strip has quickly occupied the market in recent years and become a widely promoted building material product. Its excellent sealing performance is inseparable from the reputation of the sealing strip. Doors and windows shall be movable, and gaps shall be reserved at both sides and bottom of doors and windows. Only in this way can it be opened and closed easily. However, this gap may introduce noise and dust into the room, affect indoor insulation and cause energy waste.

The commonly used flame retardant sealing strip in China is made of NBR and PVC. It has not only the ozone resistance of PVC, but also the oil resistance and cross resistance of NBR. Good physical and mechanical properties. Its main raw material PVC has rich sources, low price and wide application. Through different processing methods, the sealing strip can be divided into silicified sealing strip and non silicified sealing strip.

Since the flame-retardant sealing strip is welded as a whole and cannot be replaced after the seal is damaged, the service life of the seal directly affects the overall service life of doors and windows. According to the above analysis, the seal with silicon interlayer and fender on both sides has much better performance and service life than the low-level seal, but the price is higher than the low-level seal.

Although the sealing strip only accounts for 2% of the cost of the whole plastic window, 90% of domestic enterprises do not use high-quality sealing due to the fierce competition in the plastic window industry. At present, in the domestic door and window sealing material market, plasticized PVC sealing accounts for 90%, and the market share of modified high degree of polymerization PVC and thermoplastic elastomer recommended by relevant industry departments is very low.