水分：
water content:
橡胶在潮湿空气淋雨或浸泡在水中时，容易破坏，这是因为橡胶中的水溶性物质和清水基团等成分被水抽提溶解。水解或吸收等原因引起的。特别是在水浸泡和大气曝露的交替作用下，会加速橡胶的破坏。但在某种情况下水分对橡胶则不起破坏作用，甚有延缓老化的作用。
Rubber is easy to be damaged when it is exposed to rain or soaked in water in humid air, because water-soluble substances and clear water groups in rubber are extracted and dissolved by water. Caused by hydrolysis or absorption. Especially under the alternating action of water immersion and atmospheric exposure, it will accelerate the damage of rubber. However, in some cases, moisture does not damage the rubber, and even delays aging.
热：
Heat:
提高温度可引起橡胶的热裂解或热交联。但热的基本作用还是活化作用。提高氧扩散速度以及活化氧化反应，来加快橡胶氧化反应速度，这是普遍存在的一种老化现象——热氧老化。
Increasing the temperature can cause thermal cracking or thermal crosslinking of rubber. But the basic function of heat is activation. Increasing the oxygen diffusion rate and activating the oxidation reaction to speed up the oxidation reaction of rubber is a common aging phenomenon - thermal oxygen aging.
光：
Light:
光波越短、能量越大。使橡胶损坏作用的是能量较高的紫外线。紫外线能直接引起橡胶分子链的断裂跟交联外，橡胶因为吸收光能而产生游离基，引发并加速氧化链反应过程。紫外线光起着加热的作用。光作用其另一特点（与热作用不同）是它主要在橡表面进生。含胶率高的试样，两面会出现网状裂纹，即所谓“光外层裂”。
The shorter the light wave, the greater the energy. What causes rubber damage is high-energy ultraviolet light. Ultraviolet light can directly cause the breaking and crosslinking of rubber molecular chain. In addition, rubber produces free radicals due to the absorption of light energy, which initiates and accelerates the oxidation chain reaction process. Ultraviolet light acts as heat. Another characteristic of light action (different from heat action) is that it mainly occurs on the surface of rubber. For the sample with high glue content, network cracks will appear on both sides, that is, the so-called "smooth outer layer crack".

氧：
Oxygen:
氧在橡胶中同橡胶分子发生游离基链锁反应，分子链发生断裂或过度交联，引起橡胶性能的改变。氧化作用是橡胶老化的重要原因之一。
Oxygen has a free radical chain reaction with rubber molecules in rubber, and the molecular chains are broken or over crosslinked, resulting in the change of rubber properties. Oxidation is one of the important causes of rubber aging.
臭氧：
Ozone:
臭氧的化学活性比氧高得多，破坏性更大，一样使分子链发生断裂，但臭氧对橡胶的作用情况随橡胶变形与否而不同。当作用于变形的橡胶（主要是不饱和橡胶）时，出现与应力作用方向垂直的裂纹，即所谓“臭氧龟裂”；作用于变形的橡胶时，仅表面生成氧化膜而不龟裂。
The chemical activity of ozone is much higher and more destructive than oxygen. It also breaks the molecular chain, but the effect of ozone on rubber varies with whether the rubber is deformed or not. When used as rubber for deformation (mainly unsaturated rubber), cracks perpendicular to the direction of stress action appear, that is, the so-called "ozone cracking"; When acting on deformed rubber, only oxide film is formed on the surface without cracking.
机械应力：
Mechanical stress:
输送带在机械应力反复作用下和托辊的不断摩擦过程，会使橡胶分子链断裂生成游离基，引发氧化链反应，形成力化学过程。机械断裂分子链和机械活化氧化过程。哪个能占优势，视其所处的条件而定。此外，在应力作用下容易引起臭氧龟裂。
The continuous friction process between the conveyor belt and the idler under the repeated action of mechanical stress will break the rubber molecular chain to form free radicals, trigger the oxidation chain reaction and form a mechanochemical process. Mechanical breaking of molecular chains and mechanically activated oxidation processes. Which can dominate depends on its conditions. In addition, it is easy to cause ozone cracking under stress.
还有一些其它方面的原因：对橡胶的作用因素还有化学介质、变价金属离子、高能辐射、电和生物等。
There are also some other reasons: chemical media, variable valence metal ions, high-energy radiation, electricity, biology and so on.
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