Description

Trinonyl Phosphite is a high-purity organophosphorus compound widely used as a critical performance additive. Its primary function is to act as a highly effective stabilizer and antioxidant, protecting materials from degradation caused by heat, light, and oxidation. This makes it an essential component for manufacturers in the polymer, lubricant, and specialty chemical industries seeking to enhance product longevity and performance under demanding conditions.

Application

• Polymer Stabilizer: A key antioxidant and secondary stabilizer in polyolefins (e.g., PP, PE), PVC, and other polymers to prevent thermal and oxidative degradation during processing and end-use.
• Lubricant & Grease Additive: Functions as an anti-wear agent and antioxidant in synthetic and mineral-based lubricating oils and greases, extending service life and protecting machinery.
• Synergistic Antioxidant: Used in combination with primary phenolic antioxidants (e.g., BHT, Irganox) in plastics and elastomers to provide enhanced stabilization efficiency.
• Chemical Intermediate: Serves as a reactant in the synthesis of other organophosphorus compounds, including more complex phosphite and phosphate esters.
• Fuel & Oil Stabilizer: Helps inhibit gum and varnish formation in fuels and industrial oils by neutralizing peroxides and other oxidative species.
• Adhesive & Sealant Formulation: Improves the thermal aging resistance of adhesives, sealants, and caulks, maintaining flexibility and bond strength.

Basic Information

Product Name	Trinonyl Phosphite
CAS No.	2549-63-5
Molecular Formula	C27H57O3P
Molecular Weight	460.71 g/mol
Synonyms	Phosphorous Acid, Trinonyl Ester; Tris(nonyl) Phosphite; TNPP (commonly used abbreviation); TNP; Tris(nonylphenyl) Phosphite (related, but distinct compound); Nonyl Phosphite (Tris); Antioxidant TNPP; Stabilizer TNPP; CAS 2549-63-5
EINECS	219-840-8

Quality Control

Our Trinonyl Phosphite is manufactured under strict quality management systems to ensure batch-to-batch consistency and high performance. Each lot is accompanied by a comprehensive Certificate of Analysis (COA) detailing key parameters such as assay, color, acidity, and refractive index. We adhere to relevant industry standards and our quality protocols are designed to meet the stringent requirements of our global B2B partners in the polymer and lubricant sectors.

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) for long-term preservation and to minimize contact with air during use.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (Titration)	≥ 95.0%
Acidity (as H3PO4)	≤ 0.1%
Color (APHA)	≤ 50
Refractive Index (n20/D)	1.4780 - 1.4820
Density (20°C)	0.980 - 0.990 g/mL
Moisture (KF)	≤ 0.1%

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