Description

Tris(4-Dodecylphenyl) Phosphite is a high-molecular-weight organophosphite antioxidant widely used in polymer stabilization. This compound is valued for its exceptional ability to prevent thermal and oxidative degradation during the processing and long-term service of various polymeric materials. It is an essential additive for manufacturers in the plastics, rubber, and synthetic fiber industries seeking to enhance product durability and performance.

Application

• Primary antioxidant and stabilizer for polyolefins (PP, PE) and engineering plastics.
• Effective process stabilizer to prevent polymer degradation during high-temperature extrusion and molding.
• Used in the formulation of adhesives, sealants, and elastomers to improve aging resistance.
• Stabilizer component for synthetic fibers to maintain strength and color.
• Additive in lubricants and greases to inhibit oxidation and extend service life.
• Co-stabilizer in PVC formulations to synergize with other heat stabilizers.

Basic Information

Product Name	Tris(4-Dodecylphenyl) Phosphite
CAS No.	54076-72-1
Molecular Formula	C54H87O3P
Molecular Weight	839.24 g/mol
Synonyms	Tris(p-dodecylphenyl) phosphite; Phosphorous acid, tris(4-dodecylphenyl) ester; Tris(4-dodecylphenyl) phosphite; Antioxidant TNPP (related alkylated triphenyl phosphite type); TDPhP; Polygard (common trade name series); Weston TNPP; Tris(para-dodecylphenyl) phosphite
EINECS	258-941-1

Quality Control

Our Tris(4-Dodecylphenyl) Phosphite is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent purity, performance, and compliance with industry specifications. A Certificate of Analysis (COA) detailing key parameters is provided with each shipment to guarantee traceability and quality assurance for our global B2B clients.

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 easily oxidized; for long-term storage, maintaining an inert atmosphere (e.g., under nitrogen) is recommended to preserve efficacy. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Clear, pale yellow to amber viscous liquid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Acidity (as H3PO4)	≤ 0.1%
Color (Gardner)	≤ 5
Refractive Index (n20D)	1.480 - 1.500
Density (g/cm³ at 20°C)	0.92 - 0.98
Phosphorus Content	3.5 - 3.9%

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