Description

2,2-Bis[4-[Bis(2,3-Dimethylphenoxy)Phosphinyloxy]Phenyl]Propane is a specialized organophosphorus compound, specifically a high-performance phosphite antioxidant. This product matters for its critical role in protecting polymers and synthetic materials from oxidative degradation, thereby extending their service life and maintaining their physical properties. It is primarily needed by manufacturers in the plastics, rubber, and specialty polymer industries who require advanced stabilization solutions for high-temperature processing and demanding end-use environments.

Application

• Primary antioxidant and stabilizer in engineering plastics such as polycarbonate (PC), polyesters (PET, PBT), and polyamides (nylons).
• Key additive for stabilizing synthetic rubbers and elastomers against heat and oxygen during processing and in final products.
• Used in high-performance polymer blends and composites to prevent chain scission and discoloration.
• Essential component in lubricant and grease formulations to enhance oxidative stability under severe operating conditions.
• Employed as a synergistic co-stabilizer in combination with hindered phenol antioxidants for enhanced performance.
• Applied in the stabilization of adhesives and sealants to ensure long-term durability.

Basic Information

Product Name	2,2-Bis[4-[Bis(2,3-Dimethylphenoxy)Phosphinyloxy]Phenyl]Propane
CAS No.	58377-68-7
Molecular Formula	C50H52O6P2
Molecular Weight	810.88 g/mol
Synonyms	Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite (common trade name reference); Pentaerythritol bis(2,4-di-tert-butylphenyl) phosphite; Antioxidant 626; Phosphite stabilizer 626; Bis(2,4-dicumylphenyl) pentaerythritol diphosphite (related analog); PEP-36; Ultranox 626; Doverphos S-9228; Hostanox PAR 24
EINECS	Contact for details

Quality Control

Our production of 2,2-Bis[4-[Bis(2,3-Dimethylphenoxy)Phosphinyloxy]Phenyl]Propane adheres to stringent quality management systems. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets the high standards required for polymer stabilization. Certificates of Analysis (COA) detailing all specifications are provided with each shipment to guarantee traceability and batch-to-batch consistency for our global B2B clients.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep the container tightly sealed to minimize exposure to atmospheric moisture. Store away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0 %
Melting Point	160 - 175 °C
Volatile Matter	≤ 0.5 %
Acidity (as H3PO4)	≤ 0.05 %

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