Description

Phosphorous Acid Tris(2,6-Dinonylphenyl) Ester is a high-performance, sterically hindered organophosphite antioxidant widely used as a stabilizer in polymer processing. This compound is valued for its exceptional ability to prevent thermal and oxidative degradation, thereby extending the service life and maintaining the properties of sensitive materials. It is a critical additive for manufacturers in the plastics, synthetic rubber, and specialty chemical industries seeking to enhance product durability and performance under demanding conditions.

Application

• Polymer Stabilization: Primary function as a highly effective processing and long-term thermal stabilizer for polyolefins (PP, PE), engineering plastics, and synthetic elastomers.
• Synergistic Antioxidant Systems: Used in combination with primary phenolic antioxidants to provide superior protection against polymer degradation during high-temperature extrusion and molding.
• Color Retention: Helps prevent yellowing and discoloration in clear and pigmented polymer formulations, maintaining aesthetic quality.
• Hydroperoxide Decomposition: Acts as a secondary antioxidant by decomposing hydroperoxides formed during the auto-oxidation cycle, breaking the degradation chain reaction.
• Adhesives and Sealants: Imparts stability to hot-melt adhesives and reactive sealant systems, preventing viscosity drift and gelation.
• Lubricant and Fuel Additive: Serves as an antioxidant additive in advanced synthetic lubricants and industrial fuels to inhibit oxidation and sludge formation.

Basic Information

Product Name	Phosphorous Acid Tris(2,6-Dinonylphenyl) Ester
CAS No.	71302-73-3
Molecular Formula	C63H99O3P
Molecular Weight	935.43 g/mol
Synonyms	Tris(2,6-dinonylphenyl) phosphite; Phosphorous Acid Tris(2,6-Dinonylphenyl) Ester; Tris(2,6-dinonylphenyl) Phosphite; 2,6-Dinonylphenol Phosphite (3:1); Antioxidant TNPP (alternative naming); Sterically Hindered Phosphite; Organophosphite Antioxidant; Irgafos® TNPP (common trade name reference); Doverphos® S-686 (common trade name reference); Weston® TNPP (common trade name reference)
EINECS	Contact for details

Quality Control

Our production of Phosphorous Acid Tris(2,6-Dinonylphenyl) Ester adheres to stringent quality management protocols. Every batch is subjected to comprehensive analytical testing, including assay, color, and acidity control, to ensure consistency and performance reliability. Certificates of Analysis (COA) documenting purity and key physical-chemical parameters are available for all shipments. 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); keep the original container tightly sealed to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Color (APHA)	≤ 50
Assay (HPLC)	≥ 95.0%
Acidity (as H3PO4)	≤ 0.05%
Phosphorus Content	3.2 - 3.4%
Moisture (KF)	≤ 0.1%
Identification (IR)	Conforms

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