Description

1,1'-Dimethyl-2,2'-Oxydiethylene Bis(Diphenyl Phosphite) is a specialized organophosphorus compound widely recognized as a high-performance secondary antioxidant and process stabilizer. Its primary value lies in its ability to effectively decompose hydroperoxides, thereby preventing polymer degradation and extending material lifespan during high-temperature processing and end-use. This phosphite antioxidant is essential for manufacturers in the plastics, synthetic rubber, and specialty polymer industries who require enhanced thermal stability and color retention in their finished products.

Application

• Polymer Stabilization: Acts as a secondary antioxidant in polyolefins (PP, PE), engineering plastics (ABS, PC, PA), and synthetic rubbers to prevent thermal and oxidative degradation.
• Processing Aid: Used as a melt flow stabilizer during extrusion, injection molding, and other high-temperature polymer processing operations to maintain polymer integrity.
• Color Stabilizer: Helps prevent yellowing and discoloration in polymers, particularly in clear and light-colored applications, by scavenging peroxide radicals.
• Synergistic Formulations: Employed in combination with primary phenolic antioxidants (e.g., hindered phenols) to create synergistic stabilization systems with superior long-term performance.
• Adhesives & Sealants: Enhances the thermal aging resistance of hot-melt adhesives, polyurethane systems, and other polymeric sealants.
• Lubricant & Fuel Additive: Serves as an antioxidant additive in synthetic lubricants, greases, and industrial fuels to inhibit oxidation and sludge formation.

Basic Information

Product Name	1,1'-Dimethyl-2,2'-Oxydiethylene Bis(Diphenyl Phosphite)
CAS No.	57077-45-9
Molecular Formula	C30H32O7P2
Molecular Weight	566.52 g/mol
Synonyms	Bis(2,2-dimethyl-1,3-propanediyl) Bis(diphenyl phosphite); 2,2-Dimethyl-1,3-propanediyl Bis(diphenyl phosphite); Diphenyl Phosphite of 2,2-Dimethyl-1,3-propanediol; Antioxidant 626; Weston 626; Ultranox 626; Phosphite Stabilizer 626; 1,3-Propanediol, 2,2-dimethyl-, bis(diphenyl phosphite)
EINECS	Contact for details

Quality Control

Our production of 1,1'-Dimethyl-2,2'-Oxydiethylene Bis(Diphenyl Phosphite) adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. The manufacturing process is controlled under a quality system compliant with ISO standards. Each batch is analyzed using advanced techniques including HPLC, GC, and 31P NMR to verify identity, assay, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing all specification results is provided with every shipment.

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); containers must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can lead to hydrolysis. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White crystalline powder or flakes
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0 %
Melting Point	165 - 175 °C
Acidity (as H3PO4)	≤ 0.1 %
Volatile Matter	≤ 0.5 %
Phosphorus Content	10.8 - 11.2 %
Color (APHA)	≤ 50

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