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Updated June 2026 · Reviewed by the Nanjing Wellt Chemicals technical team Irganox 1010 is the most widely used primary phenolic antioxidant in the plastics industry, and this guide explains exactly what it does, how much to use, and when to pair it with a co-stabilizer. A sterically hindered phenol with the CAS number 6683-19-8,

Ultranox™ 626 is a highly effective, versatile antioxidant utilized extensively in the plastics industry. This phosphite antioxidant, scientifically known as Bis (2,4-dicumylphenyl) pentaerythritol diphosphate, stands out due to its exceptional hydrolytic stability and low volatility. It finds wide-ranging applications, including in polyolefins, styrene polymers, engineering thermoplastics, and polyurethane fibers, among others. This guide will delve

Irgafos 168 (CAS 31570-04-4) is a phosphite secondary antioxidant, a processing stabilizer that protects molten plastic from heat damage during extrusion, molding, and recycling. Sold as Antioxidant 168 and under names such as Alkanox 240, it pairs with a primary phenolic antioxidant like Irganox 1010 to keep polyolefins from yellowing and losing strength. This guide