Description

Bis(2,4,6-Tri-Ter-Butylphenyl)Pentaerythritol-Di-Phosphite is a high-performance organophosphite antioxidant widely used as a stabilizer in polymer processing. This compound is critical for preventing thermal and oxidative degradation, thereby extending the service life and maintaining the color and mechanical properties of sensitive materials. It is an essential additive for manufacturers in the plastics, synthetic fiber, and elastomer industries who require reliable protection against polymer chain scission and discoloration during high-temperature processing.

Application

This phosphite antioxidant is utilized across various high-value polymer applications where stability is paramount:

• Polyolefin Stabilization: Primary application in protecting polypropylene (PP) and polyethylene (PE) from thermal oxidation during extrusion and molding.
• Engineering Plastics: Used in styrenics (e.g., ABS, HIPS), polycarbonate blends, and polyamides to prevent yellowing and maintain molecular weight.
• Synthetic Fibers: Incorporated into fiber-grade polymers to ensure stability during melt-spinning processes.
• Elastomers and Adhesives: Protects synthetic rubbers and hot-melt adhesives from degradation, preserving elasticity and tack.
• Masterbatch Production: A key component in antioxidant and stabilizer concentrate formulations for simplified dosing.
• Food Contact Materials: Suitable for use in compliant polymer formulations where regulatory approvals are met.
• Recycled Polymers: Effective in stabilizing post-consumer and post-industrial recycled resin streams during reprocessing.

Basic Information

Product Name	Bis(2,4,6-Tri-Ter-Butylphenyl)Pentaerythritol-Di-Phosphite
CAS No.	126505-35-9
Molecular Formula	C57H84O6P2
Molecular Weight	903.22 g/mol
Synonyms	Pentaerythritol Bis(2,4,6-tri-tert-butylphenyl) Phosphite; Bis(2,4,6-Tri-tert-butylphenyl) Pentaerythritol Diphosphite; Pentaerythrityl Tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl) Propionate Phosphite Analog; Antioxidant 626 (common industry designation); Ultranox 626; Irgafos 126; Phosphite Stabilizer 626; 3,9-Bis(2,4-di-tert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane
EINECS	Contact for details

Quality Control

Our production of Bis(2,4,6-Tri-Ter-Butylphenyl)Pentaerythritol-Di-Phosphite adheres to stringent quality management systems. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, performance, and consistency. Certificates of Analysis (COA) documenting key parameters such as assay, melting point, and solution color are available upon request. Our quality commitment supports compliance with relevant global standards for polymer additives.

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) and easily oxidized; therefore, containers must be kept tightly sealed under an inert atmosphere (e.g., nitrogen) after opening to prevent moisture uptake and degradation. Keep away from heat and incompatible materials.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0 %
Melting Point	175 - 185 °C
Solution Color (APHA)	≤ 50
Acidity (as H3PO4)	≤ 0.05 %
Volatile Matter	≤ 0.5 %
Phosphorus Content	6.7 - 7.0 %

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