Description

Tris(Dodecylphenyl) Phosphite is a high-performance organophosphite antioxidant and stabilizer widely used in polymer processing. Its primary value lies in its ability to effectively inhibit thermal and oxidative degradation, thereby extending the service life and maintaining the color stability of various polymeric materials. This compound is essential for manufacturers in the plastics, rubber, and synthetic fiber industries seeking to enhance the durability and performance of their products under demanding conditions.

Application

• Primary antioxidant and processing stabilizer for polyolefins (PP, PE) to prevent degradation during high-temperature extrusion and molding.
• Effective color stabilizer in engineering plastics and synthetic fibers, preventing yellowing and maintaining aesthetic quality.
• Used as a synergistic co-stabilizer in combination with primary phenolic antioxidants to enhance overall stabilization performance in polymer formulations.
• Applied in the stabilization of adhesives, sealants, and elastomers to improve their resistance to heat and oxygen exposure.
• Functions as a chelating agent for trace metal deactivation in polymer systems, which can catalyze degradation reactions.

Basic Information

Product Name	Tris(Dodecylphenyl) Phosphite
CAS No.	25376-41-4
Molecular Formula	C54H87O3P
Molecular Weight	839.24 g/mol
Synonyms	Tris(nonylphenyl) phosphite (mixed isomers); Phosphorous acid, tris(nonylphenyl) ester; TNPP; Tris(mono- and di-nonylphenyl) phosphite; Tris(nonylphenyl) phosphite (TNPP); Antioxidant TNPP; Polygard; Nonylphenyl phosphite (3:1); Doverphos 4
EINECS	246-901-7

Quality Control

Our Tris(Dodecylphenyl) Phosphite is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, color, and performance. Certificates of Analysis (COA) detailing assay, acidity, and other critical parameters are provided to guarantee batch-to-batch consistency and compliance with customer requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and easily oxidized; it is recommended to store under an inert atmosphere (e.g., nitrogen) after opening to maintain product integrity.

Specification

Item	Specification
Appearance	Clear, pale yellow to amber viscous liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Acidity (as H3PO4)	≤ 0.1 %
Color (APHA)	≤ 100
Refractive Index (n20D)	1.525 - 1.535
Density (20°C)	0.97 - 0.99 g/cm³
Phosphorus Content	3.6 - 3.9 %

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