What are the reasons for the aging of Automotive Wiring Harness Protection Sleeve?

The Automotive Wiring Harness Protection Sleeve is used as a liquid, gas and other material circulation and covering carrier, and has a wide range of applications. However, if it is used or placed for a long time, it will become hard, yellow, inelastic, and even more serious, it will crack and other problems. What is the cause of the aging of the Automotive Wiring Harness Protection Sleeve?

1. The effect of ozone: Ozone has high chemical active oxygen and is more destructive. It also breaks the molecular chain, but the effect of ozone on the Automotive Wiring Harness Protection Sleeve varies with whether the Automotive Wiring Harness Protection Sleeve is deformed or not. When the deformed Automotive Wiring Harness Protection Sleeve is mainly an unsaturated Cable Sleeve, cracks appearing in a direction perpendicular to the stress direction, the so-called "ozone cracks", when the deformed Automotive Wiring Harness Protection Sleeve is applied, only the oxide film is formed on the surface without cracking.
2. The effect of moisture: the Automotive Wiring Harness Protection Sleeve is easily damaged when it is exposed to rain in humid air or soaked in water. Caused by hydrolysis or absorption. Especially under the alternating action of water immersion and atmospheric exposure, it will accelerate the damage of the Automotive Wiring Harness Protection Sleeve. However, under certain circumstances, moisture does not damage the protective cover of the automotive wiring harness, and even has the effect of delaying aging.
3. Oxidation: Oxygen in the Cable Sleeve undergoes a free radical chain reaction with the Cable Sleeve molecules, and the molecular chains are broken or excessively cross-linked, causing changes in the performance of the Cable Sleeve. Oxidation is one of the important reasons for the aging of Cable Sleeve.