1. EPDM rubber strip, also known as ethylene propylene diene monomer rubber strip, possesses excellent wear resistance. EPDM is its English abbreviation. This raw material can be considered as a synthetic rubber. Its main components are butadiene (CH2=CH2) and PE (CH2=CH-CH2). After introducing a third monomer, it becomes EPDM rubber strip, which can basically be described as a saturated high polymer.

2. It has excellent aging resistance. Even after being exposed to direct sunlight for three years, no cracks were found.

3. Chemical resistance. It exhibits strong resistance to various chemical compounds (such as acids and alkalis) and remains largely unchanged even after prolonged exposure.

4. Excellent impact elasticity and high resilience. The elasticity remains stable under low temperature conditions (it becomes hard at -57℃ and brittle at -177℃).

5. It exhibits good resistance to high-temperature aging. Generally, it can be used for long periods at 150°C, and can withstand intermittent applications at temperatures up to 200°C. Furthermore, its physical properties change relatively slowly.

6. Excellent insulation performance. The resistor remains excellent even after being immersed in water.

7. EPDM rubber strips exhibit excellent temperature resistance, which is the best among common rubbers. They also demonstrate good ozone aging resistance (in tests, they cracked after 2450 hours in a substance containing 100PPM active oxygen; styrene-butadiene rubber exhibited large cracks within 534 hours; and chloroprene rubber developed gaps within 46 hours).

2. Sharing valuable insights: A one-minute guide to understanding the classification of automotive weatherstrips

Automotive sealing strips, seemingly an unassuming component, play a crucial role in daily driving, with the most common being those for car doors and windows. What are the various classifications of automotive sealing strips? Let's briefly explore this together.

1. Classified by the name of the installation part (component) of the automotive sealing strip. The engine hood sealing strip can be further divided into front, side, and rear sections; door frame sealing strip; front and rear windshield sealing strip; side window sealing strip; sunroof sealing strip; door primary sealing strip; window guide channel sealing strip; inner and outer side strips (water cut); trunk sealing strip; noise-proof sealing strip; dust-proof strip, etc.

2. Classification by the cross-sectional shape of automotive sealing strips. They can be divided into solid products (round, square, and flat sections), hollow products, and metal-rubber composite products. Among them, metal-rubber composite sealing strips account for more than 60%. The cross-sectional design of rubber sealing strips is very important. Firstly, the shape and size of the sealing lip are designed. The sealing lips on both sides should contact the glass from both sides of the car window glass with the same and appropriate force. The length and thickness of the lip should be appropriate. Too thick and too long will cause excessive resistance to the glass lifting, while too thin and too short will lead to poor guidance and sealing of the glass, resulting in vibration, noise, and rain leakage. Secondly, the shape and size of the bottom of the cross-section are designed. The steel channel part of the car window has a protrusion for assembling the guide slot. Therefore, a corresponding structure should be designed at the bottom of the guide slot section to facilitate installation and allow the sealing strip to adhere to the steel guide slot by its own elasticity, preventing it from falling out. The shape and size of the outer ring are designed to improve the appearance. The outer surface of the guide slot should be closely fitted to the body of the car.

3. Classification based on the sealing characteristics of automotive sealing strips. These can be divided into specialized sealing strips and general-purpose sealing strips. Among them, weather-resistant sealing strips feature hollow sponge tubes, providing excellent heat and moisture retention. Commonly used weather-resistant sealing strips include door frame sealing strips, trunk sealing strips, and engine hood sealing strips. Common sealing strips include front and rear windshield sealing strips, corner window sealing strips, inner and outer strips, etc.

4. Classification by rubber compound structure. It can be divided into pure rubber sealing strips - composed of a single rubber; two composite sealing strips - composed of dense rubber and foamed sponge rubber, often containing axial metal skeleton materials inside the dense rubber; composite sealing strips - composed of two types of dense rubber (one of which is lightweight) and sponge rubber, usually containing metal skeletons and reinforcing fibers inside the dense rubber. Among the four types of composite sealing strips, cotton rubber (foam tube) is covered with a thin protective layer of rubber, further extending the service life of the sealing component.

5. Classified by the material types of automotive sealing strips, they can be divided into rubber sealing strips, plastic sealing strips, and thermoplastic elastomer sealing strips.

6. Classification based on the surface treatment status of automotive sealing strips. After additional processing, some sealing strips can be classified as flocked sealing strips, coated sealing strips, and sealing strips with fabric decoration

7. Special function classification. Some sealing strips have electronic intelligent functions, such as anti-pinch sealing strips.

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