Description

6,6'-[1,6-Hexanediylbis(Oxy)]Bis[2,4,8,10-Tetrakis(1,1-Dimethylethyl)Dibenzo[D,F][1,3,2]Dioxaphosphepin] is a high-performance, sterically hindered organophosphite antioxidant, widely recognized for its exceptional efficacy in stabilizing polymers against thermal and oxidative degradation. This compound is critical for manufacturers seeking to extend the service life and maintain the mechanical properties of sensitive materials during high-temperature processing and long-term use. It is an essential additive for producers in the plastics, synthetic fiber, and specialty polymer industries who require reliable protection against color formation and chain scission.

Application

• Polymer Stabilization: Primary application as a highly effective processing and long-term thermal stabilizer for polyolefins (PP, PE), polyamides, polyesters, and engineering plastics.
• Synergistic Systems: Used in combination with primary antioxidants (e.g., hindered phenols) to create robust stabilization packages that offer superior protection during extrusion, injection molding, and other melt-processing operations.
• Color Protection: Particularly valued in applications where preventing yellowing and maintaining color clarity is critical, such as in clear packaging films and fibers.
• High-Temperature Processing: Provides essential stabilization for polymers processed at elevated temperatures, preventing molecular weight breakdown and maintaining melt viscosity.
• Adhesives and Elastomers: Employed to enhance the aging resistance of hot-melt adhesives, synthetic rubbers, and other elastomeric materials.
• Masterbatch Production: A key active component in antioxidant and stabilizer concentrate masterbatches for simplified and uniform dispersion in final polymer compounds.

Basic Information

Product Name	6,6'-[1,6-Hexanediylbis(Oxy)]Bis[2,4,8,10-Tetrakis(1,1-Dimethylethyl)Dibenzo[D,F][1,3,2]Dioxaphosphepin]
CAS No.	71519-97-6
Molecular Formula	C68H104O6P2
Molecular Weight	1087.48 g/mol
Synonyms	Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite; Pentaerythritol bis(2,4-di-tert-butylphenyl) phosphite; Bis(2,4-ditert-butylphenyl)pentaerythritol diphosphite; Ultranox 626; Doverphos S-686; Phosphite Antioxidant 626; Ethanox 398; PEP-36; ADK STAB PEP-36; Irgafos 126; Antioxidant 626
EINECS	Contact for details

Quality Control

Every batch of our organophosphite antioxidant is manufactured and tested under a strict quality management system. We ensure compliance with relevant industry standards and customer-specific requirements. Comprehensive testing includes assay, identification, and impurity profiling to guarantee high purity and consistent performance. A detailed Certificate of Analysis (COA) is provided with each shipment, documenting all critical quality parameters.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); containers must be kept tightly sealed when not in use to prevent degradation from atmospheric moisture. 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	160 - 180 °C
Acidity (as H3PO4)	≤ 0.1 %
Volatile Matter	≤ 0.5 %
Phosphorus Content	5.6 - 5.9 %

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