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CAS: 65140-91-2

Multifunctional phenolic primary antioxidant for processing and long-term thermal stabilization


AO-1425 is a phosphorous-containing high molecular weight phenolic antioxidant. It is a non-discolouring stabilizer for organic substrates such and protects these substrates against thermo-oxidative degradation. AO-1425 is odourless, light-stable and has good colour retention. It has excellent compatibility with most substrates and high resistance to extraction.

Chemical name:

Calcium diethyl bis[[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]phosphonate]


calcium bis[ethyl (3,5-di-tert-butyl-4-hydroxybenzyl)phosphonate]

Molecular formula:


Molecular weight:

695 g/mol

CAS number:


EC number:



AO-1425 imparts processing and good long-term thermal stability to polyolefins. AO-1425 is also an effective stabilizer for polyesters, crosslinked elastomers (e. g. NBR), specialty adhesives, natural and synthetic tackifier resins. AO-1425 is used as esterification catalyst for the preparation of rosin esters.

Common applications

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