Description

Tri(Mixedmono-Anddinonylphenyl)Phosphite CAS NO 58968-53-9 is a high-performance organophosphite antioxidant and stabilizer widely used in polymer processing. Its primary value lies in its ability to effectively prevent thermal and oxidative degradation, thereby extending the service life and maintaining the color and mechanical properties of sensitive materials. This product is essential for manufacturers in the plastics, rubber, and synthetic fiber industries who require reliable stabilization against processing and environmental stresses.

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 discoloration.
• Used as a synergistic co-stabilizer in combination with primary phenolic antioxidants to enhance overall stabilization performance.
• Protects synthetic rubbers and elastomers from oxidative aging, preserving elasticity and tensile strength.
• Applied in adhesive and sealant formulations to improve shelf-life and long-term durability.
• Functions as a process stabilizer in fiber production, maintaining polymer integrity during high-temperature extrusion.

Basic Information

Product Name	Tri(Mixedmono-Anddinonylphenyl)Phosphite
CAS No.	58968-53-9
Molecular Formula	C45H69O3P
Molecular Weight	689.0 g/mol (approx.)
Synonyms	Tris(nonylphenyl) phosphite (mixed isomers); Phosphorous acid, tris(mixed mono- and dinonylphenyl) ester; TNPP; Tris(nonylphenyl) phosphite; Antioxidant TNPP; Polygard; Nonylphenyl phosphite (tri-); Stabilizer TNPP
EINECS	261-516-5

Quality Control

Our Tri(Mixedmono-Anddinonylphenyl)Phosphite is manufactured under a stringent quality management system. Each batch undergoes comprehensive analytical testing, including assay, color, and acidity determination, to ensure it meets precise specifications for use as a polymer stabilizer. A Certificate of Analysis (COA) documenting purity and key physical-chemical parameters is provided with every shipment to guarantee traceability and compliance.

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); containers must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Clear, pale yellow to amber viscous liquid
Identification (IR)	Conforms to standard
Assay (Titration)	≥ 95.0 %
Acidity (as H3PO4)	≤ 0.1 %
Color (Gardner)	≤ 3
Refractive Index (n20/D)	1.525 - 1.535
Density (20°C)	0.980 - 0.995 g/mL
Moisture (Karl Fischer)	≤ 0.1 %

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