Description

Tri-o-Tolyl Phosphite is a versatile organophosphorus compound widely used as a stabilizer and antioxidant in polymer chemistry. Its primary value lies in its ability to inhibit oxidative degradation and thermal breakdown, thereby extending the service life of sensitive materials. This product is essential for manufacturers in the plastics, rubber, and specialty chemical industries seeking to enhance the durability and performance of their formulations.

Application

• Polymer Stabilizer: Acts as a highly effective antioxidant and processing stabilizer for polyolefins (e.g., PP, PE), PVC, and synthetic rubbers, preventing discoloration and maintaining mechanical properties.
• Synergistic Additive: Used in combination with primary antioxidants (e.g., hindered phenols) to provide superior protection against thermal and oxidative stress in polymer systems.
• Intermediate for Chemical Synthesis: Serves as a key reagent in the preparation of other organophosphorus compounds, including phosphonates and metal complexing agents.
• Lubricant & Fuel Additive: Employed as an anti-wear agent and oxidation inhibitor in advanced lubricant formulations and specialty fuels.
• Epoxy Resin Modifier: Enhances the thermal stability and flame-retardant properties of epoxy resins and other thermosetting plastics.

Basic Information

Product Name	Tri-o-Tolyl Phosphite
CAS No.	26220-80-4
Molecular Formula	C21H21O3P
Molecular Weight	352.37 g/mol
Synonyms	Tris(2-methylphenyl) phosphite; Phosphorous acid, tris(2-methylphenyl) ester; o-Tolyl phosphite; TOF; TOTP; Tris(o-tolyl) phosphite; Antioxidant TOTP; Stabilizer TOTP
EINECS	247-506-3

Quality Control

Our Tri-o-Tolyl Phosphite is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets the high-purity standards required for industrial applications. A detailed Certificate of Analysis (COA) is provided with each shipment, confirming specifications for identity, purity, and key physical parameters.

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

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0 %
Acidity (as H3PO4)	≤ 0.1 %
Water Content (KF)	≤ 0.1 %
Refractive Index (n20D)	1.585 - 1.595
Density (20°C)	1.10 - 1.15 g/cm³

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