WESTCO™ AO-626 Bis (2,4’-di-tert-butylphenyl)pentaerythritol Diphosphite CAS# 26741-53-7

WESTCO™ AO-626 is a highly effective antioxidant giving excellent protection to melt flow and color during thermal processing.   It can be used in a variety of polymers, including polyolefins, polycarbonates, polyesters and styrenics.  It is often used with hindered phenols, like AO-1010 or AO-1076 for synergistic performance.  It may also be used with UV absorbers or hindered light stabilizers for optimal performance.

Packaging : 25 kg cardboard box or drum


Appearance: White powder

95% Min.

*Melting Point

160 – 180°C


1.0% Max.

*Acid Number

1.0 mg KOH/g Max.

1,1’,1”- Nirilotris-2-propanol

1.0% Max.

*Actual tech data / technical data values reported on Certificate of Analysis

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      • 60 S. Seiberling Street
      • Akron, OH 44305

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