1. EPDM rubber strip has good wear resistance and is also known as ethylene propylene diene monomer rubber strip. EPDM is the English abbreviation. This raw material can be regarded as artificial synthetic rubber. The main components are butadiene (CH2=CH2) and pe (CH2=CH-CH2). After the introduction of the third monomer, it becomes EPDM rubber strip, which can basically be said to be a saturated polymer.

2. Very good aging resistance. Even after three years of exposure to strong sunlight, no cracks were found.

3. Chemical resistance. It has strong resistance to various toxic compounds (such as acids and alkalis), and does not change much under long-term exposure.

4. Excellent impact elasticity and high rebound rate. Elasticity remains stable in low temperature environment (hardens at -57℃ and becomes brittle at -177℃.

5. Good resistance to high temperature aging. Generally, it can be used for a long time at 150°C, can withstand 200°C high temperature for intermittent application, and its physical properties are relatively slow.

6. Good insulation performance. The resistor is still excellent after being infiltrated into water.

7. EPDM rubber strips have excellent temperature resistance, which is the best among the original general rubbers. Good resistance to ozone aging (in the test, it cracked in 2450 hours in a substance containing 100PPM active oxygen; styrene-butadiene rubber had large cracks within 534 hours; chloroprene rubber had gaps within 46 hours).

2.. Dry goods sharing, one minute to take you to understand the classification of automotive sealing strips

Automobile seals Seals may seem like an inconspicuous component, but they play an important role in daily driving. The most common ones are the sealing strips of car doors and windows. What are the categories of car sealing strips? Let's take a brief look at them together.

1. Classify according to the name of the installation part (component) of the car sealing strip. The engine hood sealing strip can be divided into the front, side and rear; door frame sealing strip; front and rear windshield sealing strip; side window sealing strip; sunroof sealing strip; door head sealing strip; window guide groove sealing strip; inner and outer strips (water cut); trunk sealing strip; anti-noise sealing strip; dustproof strip, etc.

2. Classify according to the cross-sectional shape of the car sealing strip. It can be divided into solid products (round, square and flat cross-section), hollow products and metal-rubber composite products. Among them, metal-rubber composite sealing strips account for more than 60%. . The cross-sectional design of the rubber sealing strip is very important. First, 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 glass lifting, and too thin and too short will cause the glass to not be well guided and sealed, resulting in vibration, noise and rain leakage. Secondly, the shape and size of the bottom of the section are designed. There is a bulge in the steel groove part of the car window for assembling the guide groove. Therefore, the corresponding structure should be designed at the bottom of the guide groove section for easy installation, and the elasticity of the sealing strip itself can be attached to the steel guide groove to prevent it from falling out. It is the shape and size of the outer ring. In order to improve the appearance, the outer surface of the guide groove should fit closely with the car body.

3. Classification according to the sealing characteristics of the car sealing strip. It can be divided into sealing strips and through Use sealing strips. Among them, the weather sealing strip has a hollow sponge bubble tube, which has good heat preservation and moisture retention functions. Commonly used weather-resistant sealing strips include door frame sealing strips, trunk sealing strips, and engine cover sealing strips. Common sealing strips include front and rear windshield sealing strips, corner window sealing strips, internal and external strips, etc.

4. Classification by rubber composite structure. It can be divided into pure rubber sealing strips-composed of a single rubber; two composite sealing strips-composed of dense glue and foamed sponge glue, and the dense glue often contains axial metal skeleton materials; composite sealing strips-it consists of two dense glues (one of which is lightweight) and sponge glue, and usually contains metal skeletons and reinforcing fibers inside the dense glue. Four composite sealing strips, the cotton rubber (foam tube) surface is covered with a thin rubber protective layer, which further extends the service life of the seal.

5. Classification by material variety of automotive sealing strips. It can be divided into rubber sealing strips; plastic sealing strips; thermoplastic elastomer sealing strips.

6. Classification by surface treatment status of automotive sealing strips. After additional processing, some sealing strips can be classified as flocking sealing strips, coating sealing strips; sealing strips with fabric decoration

7. Classification by special functions. Some sealing strips have electronic intelligent functions, such as anti-pinch sealing strips.