Description

Phosphorous Acid Tris[2-[2-Hydroxy-3-(1,1-Dimethylethyl)-5-Methylbenzyl]-6-(1,1-Dimethylethyl)-4-Methylphenyl] Ester is a high-performance, sterically hindered phenolic phosphite antioxidant. This compound is engineered to provide exceptional stability to polymers and other materials by effectively scavenging free radicals and decomposing hydroperoxides. It is a critical additive for manufacturers seeking to enhance the longevity, color stability, and mechanical properties of their products under demanding thermal and oxidative conditions.

Application

• Polymer Stabilization: Primary application as a highly effective antioxidant and processing stabilizer for polyolefins (PP, PE), engineering plastics (ABS, PC, PA), and synthetic rubbers.
• Color Protection: Prevents yellowing and discoloration in sensitive polymers during high-temperature processing and long-term aging.
• Lubricant & Grease Additive: Used to extend the service life of industrial lubricants and greases by inhibiting oxidative degradation.
• Adhesive & Sealant Formulations: Enhances the thermal-oxidative stability of hot-melt adhesives and reactive sealant systems.
• Elastomer Protection: Improves the aging resistance of synthetic elastomers used in automotive and industrial components.
• Synergistic Blends: Often used in combination with primary phenolic antioxidants (e.g., hindered phenols) to create synergistic stabilization packages with superior performance.

Basic Information

Product Name	Phosphorous Acid Tris[2-[2-Hydroxy-3-(1,1-Dimethylethyl)-5-Methylbenzyl]-6-(1,1-Dimethylethyl)-4-Methylphenyl] Ester
CAS No.	31877-16-4
Molecular Formula	C78H105O6P
Molecular Weight	1169.61 g/mol
Synonyms	Tris(2,4-di-tert-butylphenyl) phosphite; Phosphorous acid tris(2,4-di-tert-butylphenyl) ester; Irgafos 168; Alkanox 240; Doverphos S-480; Ultranox 668; Antioxidant 168; Hostanox PAR 24; 2,4-Di-tert-butylphenyl phosphite (tris); AO-168; CAS 31570-04-4 (common mis-assignment for the commercial product).
EINECS	Contact for details

Quality Control

Our production of Phosphorous Acid Tris(2,4-di-tert-butylphenyl) Ester adheres to stringent quality management systems. Every batch is analyzed to ensure it meets precise specifications for purity, color, and hydrolytic stability. Certificates of Analysis (COA) detailing assay, melting point, solution color, and acid value are provided to guarantee consistency and performance for your critical applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); keep the original container tightly sealed to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 99.0 %
Melting Point	182 - 186 °C
Solution Color (APHA)	≤ 30
Acid Value	≤ 0.1 mg KOH/g
Volatile Matter	≤ 0.1 %

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