Description

Bisphenol A Phosphite CAS NO 4235-90-9 is a specialized organophosphorus compound widely utilized as a high-performance stabilizer and antioxidant in polymer chemistry. Its primary value lies in its ability to effectively scavenge free radicals and decompose hydroperoxides, thereby significantly enhancing the thermal and oxidative stability of various polymeric materials. This makes it an essential additive for manufacturers in the plastics, synthetic resins, and specialty coatings industries seeking to improve product longevity and performance under demanding conditions.

Application

Bisphenol A Phosphite is a versatile additive with key functions in polymer processing and stabilization. Its primary applications include:

• Polymer Stabilization: Serving as a highly effective secondary antioxidant (phosphite) in polyolefins (PP, PE), polycarbonates, ABS, and other engineering plastics to prevent thermal and oxidative degradation during processing and end-use.
• Color Retention: Improving color stability in polymers by preventing yellowing and discoloration caused by oxidation, which is critical for consumer goods and packaging materials.
• Synergistic Formulations: Used in combination with primary phenolic antioxidants to create synergistic stabilization systems that offer superior long-term aging protection for automotive parts, wire & cable insulation, and construction materials.
• Process Stabilizer: Protecting polymers from molecular weight breakdown and maintaining melt flow properties during high-temperature extrusion, injection molding, and other manufacturing processes.
• Adhesives and Sealants: Enhancing the durability and shelf-life of polyurethane and other adhesive systems by preventing gelation and viscosity increase.
• Specialty Coatings: Incorporated into coating formulations to improve their resistance to heat and light, thereby extending the service life of the coated products.

Basic Information

Product Name	Bisphenol A Phosphite
CAS No.	4235-90-9
Molecular Formula	C39H36O6P2
Molecular Weight	662.64 g/mol
Synonyms	Bisphenol A Bis(diphenyl phosphate); Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite (common trade name association); Phosphorous acid, cyclic neopentanetetrayl bis(2,4-di-tert-butylphenyl) ester; 6H-Dibenzo[c,e][1,2]oxaphosphorin, 6-[[2,4,8,10-tetrakis(1,1-dimethylethyl)dibenzo[d,f][1,3,2]dioxaphosphepin-6-yl]oxy]-, 6-oxide; Antioxidant 626; Irgafos 126; Ultranox 626; ADK STAB PEP-36
EINECS	224-213-4

Quality Control

Our production of Bisphenol A Phosphite adheres to stringent quality management protocols to ensure batch-to-batch consistency and high performance. The material is manufactured and tested in compliance with relevant industry standards. Certificates of Analysis (COA) detailing purity, assay, and key physical-chemical parameters are provided with each shipment to guarantee it meets your specific application requirements.

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). This product is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed after initial opening to minimize exposure to atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0 %
Melting Point	160 - 175 °C
Acidity (as H3PO4)	≤ 0.1 %
Volatile Matter	≤ 0.5 %
Solution Color (APHA)	≤ 50

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