Description

Phosphoric Acid Phenylbis(2,4,6-Trimethylphenyl) Ester is a specialized organophosphorus compound, widely recognized as a highly effective secondary antioxidant and thermal stabilizer in polymer science. Its primary value lies in its ability to prevent polymer degradation during high-temperature processing, thereby extending material lifespan and maintaining critical physical properties. This product is essential for manufacturers in the plastics, synthetic rubber, and specialty adhesives industries who require reliable stabilization for sensitive polymeric materials.

Application

• Polymer Stabilization: Acts as a secondary antioxidant (phosphite) in polyolefins (PP, PE), engineering plastics (ABS, PC, PA), and synthetic rubbers to prevent thermal and oxidative degradation during processing and end-use.
• Color Retention Agent: Helps maintain polymer color and clarity by neutralizing pro-degradative metal catalyst residues and preventing yellowing in clear and pigmented formulations.
• Synergistic Blending: Used in combination with primary phenolic antioxidants (e.g., hindered phenols) to create highly efficient stabilization systems with superior performance.
• Hydroperoxide Decomposition: Functions as a hydroperoxide decomposer, interrupting the auto-oxidation cycle in polymers to enhance long-term thermal stability (LTS).
• Adhesive & Sealant Formulations: Imparts processing stability and prevents gel formation in hot-melt adhesives and reactive sealant systems.
• Lubricant & Fuel Additive Intermediate: Serves as a key synthetic intermediate for producing advanced anti-wear and antioxidant additives for lubricants and industrial fluids.

Basic Information

Product Name	Phosphoric Acid Phenylbis(2,4,6-Trimethylphenyl) Ester
CAS No.	73179-44-9
Molecular Formula	C30H31O4P
Molecular Weight	486.53 g/mol
Synonyms	Phenylbis(2,4,6-trimethylphenyl) Phosphite; Tris(2,4,6-trimethylphenyl) Phosphite (common misnomer); Phosphorous Acid, Phenyl Bis(2,4,6-trimethylphenyl) Ester; Phenyl Di(2,4,6-trimethylphenyl) Phosphite; Antioxidant 168 (commercial designation); Irgafos 168 (trade name); Tris(2,4-dimethylphenyl) Phosphite (related compound); TMPhP; Aromatic Phosphite Stabilizer.
EINECS	Contact for details

Quality Control

Our production of Phosphoric Acid Phenylbis(2,4,6-Trimethylphenyl) Ester adheres to stringent quality management protocols to ensure batch-to-batch consistency and high performance. Each lot is analyzed against rigorous internal specifications, which typically include assay (by HPLC), identification (IR), and key impurity profiles. Certificates of Analysis (COA) documenting purity, physical properties, and performance tests are available for every shipment. Our quality system 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 room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); containers must be kept sealed to prevent contact with atmospheric moisture, which can lead to hydrolysis. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or flakes
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0 %
Melting Point	175 - 185 °C
Acidity (as H3PO4)	≤ 0.1 %
Volatile Matter	≤ 0.5 %
Solution Color (APHA)	≤ 50

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