Description

Tris(Methylphenyl) Phosphite is a versatile organophosphorus compound widely used as a high-performance stabilizer and antioxidant in polymer systems. Its primary value lies in its ability to effectively inhibit thermal and oxidative degradation, thereby extending the service life and maintaining the properties of sensitive materials. This product is essential for manufacturers in the plastics, rubber, and specialty chemical industries seeking to enhance the durability and color stability of their formulations.

Application

• Polymer Stabilization: Acts as a highly effective secondary antioxidant and phosphite processing stabilizer for polyolefins (PP, PE), PVC, engineering plastics, and synthetic rubbers.
• Color Retention: Prevents yellowing and discoloration in polymers during high-temperature processing and long-term aging, crucial for consumer goods and packaging.
• Synergistic Formulations: Used in combination with primary phenolic antioxidants to provide superior stabilization, improving cost-performance ratios in stabilizer packages.
• Adhesives and Sealants: Enhances the thermal stability and weatherability of adhesive resins and sealant formulations.
• Lubricant and Fuel Additive: Serves as an antioxidant additive in synthetic lubricants, greases, and industrial fuels to prevent sludge formation.
• Intermediate for Synthesis: Utilized as a key reagent or intermediate in the synthesis of more complex organophosphorus compounds for specialized applications.

Basic Information

Product Name	Tris(Methylphenyl) Phosphite
CAS No.	25586-42-9
Molecular Formula	C21H21O3P
Molecular Weight	352.36 g/mol
Synonyms	Tris(o-tolyl) phosphite; Phosphorous acid, tris(2-methylphenyl) ester; Tris(2-methylphenyl) phosphite; Tris(o-methylphenyl) phosphite; TOMP; o-Tolyl phosphite; Antioxidant TOM; Stabilizer TOM; Tris(2-tolyl) phosphite
EINECS	247-096-1

Quality Control

Our Tris(Methylphenyl) Phosphite is manufactured under a stringent quality management system to ensure batch-to-batch consistency and high purity. Each lot is subjected to comprehensive analytical testing, including assay, color, and specific gravity, to meet exacting industry specifications. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee compliance with your technical requirements.

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 product is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent contact with atmospheric moisture, which can lead to hydrolysis and degradation of the product.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0 %
Color (APHA)	≤ 50
Specific Gravity (20°C)	1.10 - 1.15
Refractive Index (n20D)	1.570 - 1.580
Acidity (as H3PO4)	≤ 0.05 %
Water Content (KF)	≤ 0.1 %

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