Description

Tris(Nonylphenyl) Phosphite CAS NO 26523-78-4 is a high-performance organophosphite antioxidant and stabilizer widely used in polymer processing. This compound is critical for preventing thermal and oxidative degradation, thereby extending the service life and maintaining the physical properties 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 under demanding conditions.

Application

• Primary antioxidant and stabilizer in polyolefins (PP, PE) and other polymers to prevent thermal degradation during processing.
• Effective color stabilizer in ABS, PVC, and engineering plastics, preventing yellowing and maintaining aesthetic quality.
• Used as a synergist in combination with primary phenolic antioxidants to enhance overall stabilization efficiency.
• Protects synthetic rubbers and elastomers from oxidative aging, preserving elasticity and mechanical strength.
• Applied in adhesive and sealant formulations to improve shelf-life and thermal stability.
• Functions as a process stabilizer in fiber production, protecting polymers during high-temperature extrusion and spinning.

Basic Information

Product Name	Tris(Nonylphenyl) Phosphite
CAS No.	26523-78-4
Molecular Formula	C45H69O3P
Molecular Weight	689.00 g/mol
Synonyms	Tris(4-nonylphenyl) phosphite; Phosphorous acid, tris(4-nonylphenyl) ester; TNPP; Nonylphenyl phosphite (tri); Tris(p-nonylphenyl) phosphite; Antioxidant TNPP; Polygard; CAS 26523-78-4
EINECS	247-759-6

Quality Control

Our Tris(Nonylphenyl) Phosphite is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing, including assay, color, and acidity determination, to ensure it meets precise specifications for use in sensitive polymer applications. Certificates of Analysis (COA) documenting purity and key physical-chemical parameters are available upon request to support your quality assurance protocols.

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 optimal quality and prevent degradation.

Specification

Item	Specification
Appearance	Clear, pale yellow to amber viscous liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0 %
Color (APHA)	≤ 150
Acidity (as H3PO4)	≤ 0.1 %
Refractive Index (n20D)	1.525 - 1.535
Density (20°C)	0.97 - 0.99 g/cm³

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