An antioxidant is a chemical additive used to prevent or slow the oxidation of materials, especially polymers, when exposed to air, heat, or other environmental factors.
In the commercial and industrial wire and cable industry, antioxidants are essential additives used in insulation and jacket materials, particularly in thermoplastics like PVC, polyethylene, and other polymers. Their primary role is to inhibit degradation caused by oxidation, which can occur due to prolonged exposure to oxygen, elevated temperatures, UV radiation, or mechanical stress.
Oxidation can lead to embrittlement, discoloration, cracking, and loss of flexibility in cable insulation over time. When oxidation is not controlled, it can compromise the performance, safety, and lifespan of cables used in critical infrastructure environments. By integrating antioxidants into the compound formulation during the manufacturing process, cable manufacturers can extend the durability and reliability of products used in demanding commercial and industrial settings.
Different types of antioxidants may be used depending on the expected exposure conditions. For example, primary antioxidants neutralize free radicals, while secondary antioxidants decompose hydroperoxides formed during polymer degradation. In many applications, both are used in tandem to ensure long-term material stability.
The use of antioxidants in polymers became more widespread in the mid-20th century as synthetic materials gained popularity in industrial applications. As polymer chemistry advanced, the need to stabilize materials against thermal and oxidative stress led to the development of various antioxidant formulations now commonly used in cable insulation compounds.