4,4'-methylenebis(2,6-di-tert-butylphenol)

4,4'-methylenebis(2,6-di-tert-butylphenol) (CAS 118-82-1), sold under trade names Ionox 220 and Binox M and designated E702 in food-contact applications, is a hindered phenolic antioxidant.

It is used to protect polymers, lubricants, and elastomers from oxidative degradation during processing and service life. Its bisphenolic structure delivers primary antioxidant performance in demanding thermal and mechanical environments.

In lubricant formulations, it inhibits oxidation in industrial oils and metalworking fluids, extending fluid service intervals and protecting metal surfaces. Rubber and tire compounders incorporate it to prevent heat-induced degradation.

This occurs during vulcanization and in-service flexing. Coatings and adhesive formulators use it to stabilize resin systems against discoloration and viscosity drift during storage and cure cycles.

In plastics processing, it protects polyolefins and engineering resins during high-temperature extrusion and injection molding. This ensures the structural integrity and appearance of the final plastic components.

4,4'-methylenebis(2,6-di-tert-butylphenol) is supplied as a white to off-white crystalline powder. Technical and food-contact grades are available, with the specific designation relevant for buyers sourcing into food-packaging.

This applies to food-contact polymer applications where high purity is required. Standard packaging includes fiber drums and bags, with bulk quantities available for industrial procurement and large-scale manufacturing.