Description

6,6'-[1,6-Hexanediylbis(Oxy)]Bis[4,8-Bis(1,1-Dimethylethyl)-2,10-Dimethyl-12H-Dibenzo[D,G][1,3,2]Dioxaphosphocin] is a high-performance, sterically hindered phenolic phosphite antioxidant. This compound matters because it provides exceptional long-term thermal stability and color retention for polymers by effectively scavenging free radicals and decomposing hydroperoxides. It is primarily needed by manufacturers in the polymer and plastics industries to protect sensitive materials during high-temperature processing and extend the service life of finished products.

Application

• Primary antioxidant and stabilizer in polyolefins (PP, HDPE, LDPE) and engineering plastics.
• Enhances melt flow stability and prevents yellowing during extrusion and injection molding processes.
• Used in polymer masterbatches and concentrates for consistent additive dispersion.
• Critical for stabilizing adhesives, sealants, and elastomers against thermal-oxidative degradation.
• Protects synthetic fibers during high-temperature spinning and drawing operations.
• Employed in food-grade polymer packaging formulations where regulatory compliance is required.
• Improves the longevity of wire and cable insulation materials.

Basic Information

Product Name	6,6'-[1,6-Hexanediylbis(Oxy)]Bis[4,8-Bis(1,1-Dimethylethyl)-2,10-Dimethyl-12H-Dibenzo[D,G][1,3,2]Dioxaphosphocin]
CAS No.	68938-93-2
Molecular Formula	C52H72O6P2
Molecular Weight	855.07 g/mol
Synonyms	Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite; Ultranox 626; Doverphos S-686; Phosphite antioxidant 626; Pentaerythritol bis(2,4-di-tert-butylphenyl) phosphite; Antioxidant 626; Ethanox 398; Hostanox PAR 626
EINECS	Contact for details

Quality Control

Our production of this phosphite antioxidant adheres to strict quality management systems. Every batch is tested to ensure it meets precise specifications for purity and performance. Certificates of Analysis (COA) documenting key parameters such as assay, melting point, and solution color are available upon request to support your quality assurance protocols.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after initial opening to prevent moisture absorption, which can affect product performance.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0 %
Melting Point	165 - 175 °C
Acidity (as H3PO4)	≤ 0.10 %
Volatile Matter	≤ 0.50 %
Solution Color (APHA)	≤ 50

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