Antioxidant 626, CAS No.: 26741-53-7
Antioxidant 626 is a high-performance organophosphite antioxidant chemically known as Bis(2,4-di-tert-butylphenyl) Pentaerythritol Diphosphite. It is also commercially known as Antioxidant 24, Ultranox 626, ADK Stab PEP 24 and Mark PEP 24.
Chemical Name: Bis(2,4-di-tert-butylphenyl) Pentaerythritol Diphosphite
CAS No.: 26741-53-7
Molecular Formula: C33H50O6P2
Molecular Weight: 604.70 g/mol
EC No.: 247-952-5
IUPAC Name: 3,9-Bis(2,4-di-tert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane
Main Synonyms: Antioxidant 626, Antioxidant 24, Ultranox 626, ADK Stab PEP 24, Mark PEP 24, Weston 626, PEP 24
Chemical Type: Organophosphite antioxidant

Appearance: White Powder
Acidity: ≤1.0
Melting point: 170 - 180ºC
Phosphorus content: 10.0 - 10.3%
Bulk density with gas filling: 30 (20℃, lbs/ft3)
Free 2,4-di-tert-butylphenol: ≤1.0
Antioxidant 626 has excellent processing stability and is suitable for various polymers and related applications, such as PE, PP, and ethylene-vinyl acetate copolymer. It can also be applied to engineering plastics, such as polystyrene homopolymers/copolymers, polyurethanes, elastomers, adhesives, and other organic substrates. It can effectively prevent degradation during compounding, pelletizing, processing, recycling, and other usage processes. Recommended addition amount: 0.05 - 0.15%.
25 kg kraft bags with PE inner bags.
6400MT/year.
Store in a cool, dry and well-ventilated area.
Keep the container tightly closed and protected from moisture.
Avoid prolonged exposure to direct sunlight, heat and humidity.
Hosea Chem® supplies Antioxidant 626, CAS 26741-53-7, for polymer stabilization, plastic processing, masterbatch, rubber, coatings and adhesive applications.
As a China manufacturer and supplier, Hosea Chem can support bulk orders, export packaging, product documentation and customized supply requirements for international customers.