The rubber products degrade during use by various factors such as oxygen, ozone, heat, light and dynamic fatigue. Degradation factors are various depending on the conditions of use, and there are a lot of degradation factors besides the above-mentioned. The reagents that are added to prevent degradation are called antioxidants. Degradation causes the phenomena such as physical properties degradation, hardening, softening and cracking, and then rubber products cannot maintain the function of the products. To prevent degradation by these various factors and to maintain the product-life cycle for a long term, addition of antioxidants is very important.
