2,2'-Methylenebis(6-tert-butyl-4-methylphenol)

2,2'-Methylenebis(6-tert-butyl-4-methylphenol) (CAS 119-47-1) is a bisphenolic antioxidant commercially known under trade names including CAO 5, AO 2246, Advastab 405, and Bisalkofen BP. It carries EC number 204-327-1 and is classified under HS code 29072900. No E-code designation applies to this substance.

In rubber compounding, it inhibits oxidative chain scission during processing and service by donating hydrogen atoms to peroxy radicals, slowing polymer degradation. In lubricant formulations, the same mechanism extends fluid service life under thermal stress. It also functions as a secondary stabilizer in polyolefin and elastomer systems, complementing phosphite co-stabilizers.

This material is supplied as a white to off-white solid and is subject to REACH registration requirements for EU market access. Procurement teams should confirm supplier SDS documentation and purity specifications prior to sourcing. Standard industrial packaging formats apply; consult your supplier for available lot sizes and documentation.