Description

Trisundecyl Phosphite is a high-performance organophosphorus compound widely used as a stabilizer and antioxidant. Its primary value lies in its ability to effectively inhibit thermal and oxidative degradation in various polymer systems, thereby extending product lifespan and maintaining material integrity. This makes it an essential additive for manufacturers in the plastics, rubber, and lubricant industries seeking to enhance the durability and performance of their formulations.

Application

• Primary antioxidant and stabilizer in polyolefins (e.g., PP, PE) to prevent thermal degradation during processing.
• Key additive in synthetic lubricants and hydraulic fluids to improve oxidative stability and extend service life.
• Stabilizing agent for elastomers and synthetic rubbers against heat aging.
• Used in adhesive and sealant formulations to enhance long-term stability.
• Co-stabilizer in PVC and other halogenated polymer systems.
• Intermediate in the synthesis of other specialty phosphite antioxidants.

Basic Information

Product Name	Trisundecyl Phosphite
CAS No.	94133-78-5
Molecular Formula	C33H69O3P
Molecular Weight	544.9 g/mol
Synonyms	Tris(undecyl) Phosphite; Phosphorous Acid Tris(undecyl) Ester; Tris(n-undecyl) Phosphite; Undecyl Phosphite (Tris); Antioxidant TNPP Analog (C11); Tris(C11 alkyl) Phosphite; Stabilizer 1178 (common trade designation)
EINECS	Contact for details

Quality Control

Our Trisundecyl Phosphite is manufactured under strict quality management systems. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color, and acid value. A comprehensive Certificate of Analysis (COA) documenting these results is provided with each shipment to guarantee consistency and compliance with your formulation requirements.

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); containers must be kept tightly sealed to prevent contact with atmospheric moisture.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Acid Value	≤ 1.0 mg KOH/g
Color (APHA)	≤ 50
Moisture (KF)	≤ 0.1%
Refractive Index (n20D)	1.455 - 1.465
Density (20°C)	0.88 - 0.92 g/cm³

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