Description

Tris(Nonylphenyl) Phosphite CAS NO 3050-88-2 is a high-performance organophosphite antioxidant widely used as a stabilizer in polymer processing. Its primary value lies in its ability to prevent thermal and oxidative degradation, thereby extending the service life and maintaining the color of finished polymeric materials. This compound is essential for manufacturers in the plastics, rubber, and synthetic fiber industries who require reliable protection against polymer chain scission and discoloration during high-temperature processing and long-term use.

Application

• Primary antioxidant and stabilizer for polyolefins (PP, PE) and other polymers.
• Protects synthetic rubbers and elastomers from heat aging.
• Used in the production of adhesives and sealants to enhance thermal stability.
• Stabilizer component in lubricant and grease formulations to prevent oxidation.
• Additive for PVC and other vinyl polymers to improve processing stability.
• Protective agent in polyurethane systems and synthetic fibers.
• Used as a synergist in combination with primary phenolic antioxidants for enhanced performance.
• Intermediate in the synthesis of other specialty phosphite compounds.

Basic Information

Product Name	Tris(Nonylphenyl) Phosphite
CAS No.	3050-88-2
Molecular Formula	C45H69O3P
Molecular Weight	689.00 g/mol
Synonyms	Tris(4-nonylphenyl) phosphite; Phosphorous acid, tris(4-nonylphenyl) ester; TNPP; Nonylphenyl phosphite (3:1); Tris(p-nonylphenyl) phosphite; Antioxidant TNPP; Irgafos TNPP; Polygard TNPP
EINECS	221-267-7

Quality Control

Our Tris(Nonylphenyl) Phosphite is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color, and performance. Certificates of Analysis (COA) documenting key parameters such as assay, acid value, and color are available upon request to support your quality assurance and regulatory compliance needs.

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) and easily oxidized; it is recommended to store under an inert atmosphere (e.g., nitrogen) after opening to maintain product integrity. Keep away from heat and incompatible materials.

Specification

Item	Specification
Appearance	Clear, pale yellow to amber viscous liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0 %
Acid Value	≤ 0.5 mg KOH/g
Color (Gardner)	≤ 3
Refractive Index (n20D)	1.525 - 1.535
Density (20°C)	0.97 - 0.99 g/cm³
Phosphorus Content	4.3 - 4.6 %

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