From the battery compartments of new energy vehicles to the interfaces of precision electronic equipment, from the doors and Windows of high-rise buildings to the sealing of food packaging, special sealing strips, with their diverse material properties and precise scene adaptability, have become the core components for ensuring the operation of equipment and the sealing of systems. Relying on the elastic advantages of rubber materials and modification technologies, they build a "protective barrier" in complex working conditions such as high and low temperatures, strong corrosion, and high cleanliness. The depth of their application and technical precision demonstrate the innovative vitality of the rubber and plastic products industry.
New energy vehicles: "Power Sealing Rings" Resistant to High and Low Temperatures
The sealing protection of battery packs in new energy vehicles places extreme demands on the material of rubber strips. Sealing strips made of hydrogenated nitrile butadiene rubber (HNBR) have become the "core guardians" of battery compartments due to their wide temperature resistance from -40℃ to 150℃ and excellent resistance to electrolyte (with a volume expansion rate of less than 8% in lithium battery electrolyte). It can closely adhere to the battery pack shell, effectively preventing the invasion of water vapor and dust, and at the same time resisting the corrosion caused by the leakage of electrolyte. In the motor system, its high-strength tear resistance can withstand the friction loss caused by high-speed operation. Combined with the bonding reinforcement technology of silane-modified polyether adhesive, it ensures that the power system still achieves IP67-level sealing protection under harsh road conditions, providing a guarantee for the safe driving range of the entire vehicle.
In the field of electronic information: High-cleanliness "precision protective clothing"
In precision electronic fields such as smart phones and chip manufacturing equipment, strict requirements are placed on the cleanliness and insulation of sealing strips. Fluorosilicone rubber (FVMQ) strips have become the preferred choice because they have passed the ISO 10993 biocompatibility certification and do not release volatile organic compounds (VOCs). In the dust-free pipelines of the chip packaging workshop, it can achieve micron-level sealing to prevent impurities from entering and affecting the chip yield. At the waterproof interface of the mobile phone, its excellent aging resistance (service life > 3 years in high-temperature and high-humidity environments) can resist the erosion of daily water stains, while maintaining good insulation performance and avoiding the risk of short circuits. Some high-end rubber strips also incorporate conductive particles, achieving both sealing and electromagnetic shielding functions, and are suitable for the signal protection requirements of 5G devices.
Building curtain wall: An "energy-saving barrier" against wind load
The sealing performance of high-rise building curtain walls is directly related to energy conservation and wind resistance safety. Ethylene propylene diene monomer (EPDM) modified rubber strips, with their outstanding weather resistance (outdoor ozone aging life > 10 years) and resistance to compression set (compression set rate < 15%), have become core components of curtain wall systems. It can adapt to the temperature difference changes in different regions, maintaining elasticity in the extremely cold of -50℃ or the extremely hot of 70℃, effectively blocking the invasion of outdoor wind and rain and heat conduction, and reducing the energy consumption of building air conditioning by more than 20%. In super high-rise buildings, reinforced EPDM rubber strips can also withstand the wind pressure impact of typhoons of up to level 12. Combined with multiple sealing structures, they form a stable "energy-saving protection line".
Food Packaging: A Safe and Non-toxic "Guardian of Freshness"
The sealing strips in the food packaging field are based on the core principle of "safety and non-toxicity". Thermoplastic elastomer (TPE) rubber strips are widely used in products such as food storage containers and sealed cans because they do not require vulcanization, are recyclable, and comply with the national food safety standard GB 4806.11-2022. Its excellent heat-sealing property can maintain a seal at 80℃ heating conditions, preventing food from absorbing flavors. Even in a low-temperature refrigeration environment, it will not lose its elasticity due to brittleness, effectively extending the shelf life of food. Some of the adhesive strips used for packaging complementary foods for infants and young children have also passed the heavy metal migration test to ensure safe use.
These special-shaped sealing strips, based on material innovation and oriented towards scene demands, play the role of "invisible guardians" in various industries. From the power safety of new energy vehicles to the precise protection of electronic equipment, from building energy conservation to food preservation, their technological upgrades not only promote the high-quality development of the rubber and plastic products industry, but also become the "micro cornerstone" supporting the efficient operation of multiple fields.
