Description

2-(1,1-Dimethylethyl)-6-Methyl-4-[3-[[2,4,8,10-Tetrakis(1,1-Dimethylethyl)Dibenzo[D,F][1,3,2]Dioxaphosphepin-6-Yl]Oxy]Propyl] Phenol is a high-performance, sterically hindered phenolic antioxidant with a phosphite moiety, designed for superior polymer stabilization. This compound matters because it provides exceptional long-term thermal stability and process protection by effectively scavenging free radicals and decomposing hydroperoxides. It is primarily needed by polymer manufacturers and compounders in industries such as plastics, elastomers, and synthetic fibers to extend product lifespan and maintain material properties under demanding conditions.

Application

• Primary and co-stabilizer in polyolefins (PP, HDPE, LDPE) for enhanced thermal aging resistance.
• Stabilization of engineering plastics and styrenic polymers against degradation during high-temperature processing.
• Critical additive in elastomer and rubber formulations to prevent cracking and maintain elasticity.
• Protection for adhesives, sealants, and coatings from oxidative degradation.
• Used in fiber and filament production to ensure color and strength stability.
• Component in masterbatch and concentrate formulations for consistent additive delivery.

Basic Information

Product Name	2-(1,1-Dimethylethyl)-6-Methyl-4-[3-[[2,4,8,10-Tetrakis(1,1-Dimethylethyl)Dibenzo[D,F][1,3,2]Dioxaphosphepin-6-Yl]Oxy]Propyl] Phenol
CAS No.	203255-81-6
Molecular Formula	C44H65O4P
Molecular Weight	689.0 g/mol
Synonyms	Phenol, 2-(1,1-dimethylethyl)-6-methyl-4-[3-[[2,4,8,10-tetrakis(1,1-dimethylethyl)dibenzo[d,f][1,3,2]dioxaphosphepin-6-yl]oxy]propyl]-; Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite blended phenolic antioxidant; Antioxidant 626; Irgafos 126; ADK STAB PEP-36; Songnox 6260; Phosphite/Phenolic blend antioxidant; High molecular weight hindered phosphite antioxidant.
EINECS	Contact for details

Quality Control

Our production of this antioxidant adheres to strict quality management systems, ensuring batch-to-batch consistency for critical polymer applications. Each lot is tested against comprehensive specifications for identity, purity, and performance characteristics. Certificates of Analysis (COA) documenting key parameters are available upon request to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is easily oxidized; for long-term storage, maintaining an inert atmosphere (e.g., under nitrogen) is recommended to preserve efficacy. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0 %
Melting Point	185 - 195 °C
Volatile Matter	≤ 0.5 %
Phosphorus Content	4.3 - 4.6 %
Solution Color (APHA)	≤ 50

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.