Description

22Methylenebis46Ditertbutylphenyl2Ethylhexylphosphite is a high-performance organophosphite antioxidant widely used as a stabilizer in polymer processing. Its primary value lies in its exceptional ability to prevent thermal and oxidative degradation, thereby extending the service life and maintaining the properties of sensitive materials. This compound is essential for manufacturers in the plastics, synthetic rubber, and specialty chemical industries who require reliable protection for their products during high-temperature processing and long-term use.

Application

• Polymer Stabilization: Primary antioxidant and process stabilizer for polyolefins (PP, PE), polyamides, polyesters, and engineering plastics.
• Synthetic Rubber Production: Protects synthetic elastomers like SBR, BR, and NBR against thermal oxidation during compounding and vulcanization.
• Adhesive & Sealant Formulations: Enhances the shelf-life and thermal stability of hot-melt and reactive adhesive systems.
• Lubricant & Fuel Additive: Acts as an antioxidant in synthetic lubricants, greases, and industrial fuels to prevent sludge formation.
• Masterbatch & Compound Production: A key component in additive masterbatches for consistent and efficient dispersion in final polymer products.
• Color Protection: Helps prevent color change and yellowing in pigmented and clear polymer articles exposed to heat.

Basic Information

Product Name	22Methylenebis46Ditertbutylphenyl2Ethylhexylphosphite
CAS No.	126050-54-2
Molecular Formula	C41H69O3P
Molecular Weight	640.96 g/mol
Synonyms	Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite; Pentaerythritol bis(2,4-di-tert-butylphenyl) phosphite; Phosphite stabilizer 626; Antioxidant 626; Ultranox 626; Doverphos S-686; Irgafos 126; ADK STAB PEP-36; 2,4-Di-tert-butylphenyl pentaerythritol bis(phosphite); CAS 26741-53-7 (related isomer/closely named compound)
EINECS	Contact for details

Quality Control

Our production of 22Methylenebis46Ditertbutylphenyl2Ethylhexylphosphite adheres to stringent quality management protocols. Every batch is analyzed to ensure it meets precise specifications for purity, color, and hydrolytic stability, which are critical for consistent performance in demanding applications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with each shipment to guarantee traceability and compliance with your quality standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and 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 degradation. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or flakes
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0 %
Melting Point	160 - 180 °C
Acidity (as H3PO4)	≤ 0.1 %
Volatile Matter	≤ 0.5 %
Phosphorus Content	9.5 - 10.0 %
Solution Color (APHA)	≤ 50

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