Currently, the common door and window sealing strips on the market are mainly used in plastic steel doors and windows, aluminum alloy doors and windows, wooden doors and windows, and other architectural decorative doors and windows. There are three common materials, namely EPDM, silicone rubber, and PVC.

In the door and window industry, there has always been a controversy over which material is better for sealing strips. Although the investment in door and window sealing strips is small, their role cannot be ignored. Sealing strips not only need to be waterproof, dustproof, and windproof, but also energy-saving, heat-retaining, and soundproof.

Whether it's good or not, and which one is better, is a matter of subjective opinion. All three raw materials have their respective advantages. However, factors such as the manufacturer of the door and window sealing strips, the content of raw materials, and production technology must also be considered. In addition, the performance requirements of the application scenarios are also important.

Ethylene-propylene-diene monomer (EPDM) rubber is a copolymer of ethylene, propylene, and a small amount of a third non-conjugated diene monomer. Its international name is ethylene propylene diene monomer or EPDM.

EPDM is a hard rubber with excellent properties in rubber. It is anti-aging, anti-corrosive, and resistant to ozone. It does not shrink at low temperatures, is relatively stable, and can be used continuously for more than ten years without changing its quality.

EPDM sealing strips are formed in one step using microwave vulcanization technology. They boast a smooth and aesthetically pleasing surface, excellent elasticity and resistance to compression deformation, weathering and aging resistance, and good stability. They are resistant to deformation in high-temperature environments and do not shrink in low-temperature environments. It can be said that they are not only heat-resistant but also cold-resistant. They can be used in environments ranging from -50 to 135°C.

Silicone rubber refers to rubber whose main chain is composed of alternating silicon and oxygen atoms, with silicon atoms typically connected to two organic groups. Ordinary silicone rubber is mainly composed of siloxane linkages containing methyl groups and a small amount of vinyl groups. The introduction of phenyl groups can improve the high and low temperature resistance of silicone rubber, while the introduction of trifluoropropyl and cyano groups can enhance the temperature resistance and oil resistance of silicone rubber.

Silicone rubber exhibits excellent low-temperature resistance, typically operating at -55°C. Upon the introduction of phenyl groups, its temperature tolerance can reach -73°C. Silicone rubber also demonstrates remarkable heat resistance. It can operate for extended periods at 180°C and withstand temperatures slightly above 200°C for weeks or longer, while still maintaining its elasticity, and can instantly withstand temperatures exceeding 300°C.

Silicone rubber has good air permeability, and its oxygen transmission rate is the highest among synthetic polymers.

The main raw material of silicone sealing strips is silicone rubber, which endows them with excellent insulation properties, resistance to high and low temperatures, good resilience, and most importantly, no odor.

Silicone rubber sealing strips are not only aesthetically pleasing and colorful, with a soft feel and remarkable elasticity when stretched, but they also exhibit characteristics such as aging resistance, compressive strength, and water penetration resistance. Furthermore, they demonstrate excellent performance in energy conservation and environmental protection, sound insulation and noise reduction, and UV resistance. They can effectively address the issue of reduced sealing performance in wooden doors caused by subsidence during long-term use.

Some unscrupulous manufacturers produce inferior silicone sealing strips with low glue content. Such strips have poor gloss and will deteriorate within a few years.

The main component of PVC sealing strips is polyvinyl chloride, with the addition of plasticizers and other ingredients to enhance its heat resistance, toughness, ductility, etc. PVC sealing strips are easy to mold, recyclable, and reusable.

PVC sealing strips are arguably the least recommended among the three. Due to the high temperature environment in summer, they tend to soften, causing oil on the surface of the sealing strips to precipitate, get dusty, turn yellow (oil tends to attract dirt), and leak; in winter, they become hard and brittle, and their sealing performance is poor. However, they still have one advantage: they are inexpensive.

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