Description

Trimethylolpropane Phosphite is a specialized organophosphorus compound that serves as a highly effective intermediate and stabilizer. Its unique structure provides excellent performance as a chelating agent and antioxidant, making it critical for enhancing product durability and process efficiency. This chemical is essential for manufacturers in the polymer, lubricant, and specialty chemical industries seeking to improve the thermal and oxidative stability of their formulations.

Application

• Polymer Stabilizer: Acts as a secondary antioxidant and metal deactivator in polyolefins (e.g., PP, PE), PVC, and engineering plastics to prevent thermal degradation during processing and extend service life.
• Lubricant & Grease Additive: Used as an anti-wear and extreme pressure (EP) additive, as well as an antioxidant, in synthetic lubricants and industrial greases.
• Chemical Intermediate: Serves as a key building block for synthesizing more complex phosphite and phosphate esters, flame retardants, and specialty surfactants.
• Adhesive & Sealant Formulations: Imparts improved aging resistance and stability to polyurethane and other polymer-based adhesives and sealants.
• Synthetic Resin Modifier: Enhances the color stability and processing characteristics of alkyd, polyester, and other synthetic resins.

Basic Information

Product Name	Trimethylolpropane Phosphite
CAS No.	824-11-3
Molecular Formula	C12H27O6P
Molecular Weight	298.32 g/mol
Synonyms	2-Ethyl-2-[[(2-ethyl-2-hydroxybutoxy)hydroxyphosphinyl]oxy]methyl]-1,3-propanediol cyclic phosphite; TMP Phosphite; Tris(2-ethylhexyl) Phosphite (related); Phosphorous Acid, Cyclic 2-Ethyl-2-(hydroxymethyl)-1,3-propanediyl 2-Ethylhexyl Ester; Trimethylolpropane, Phosphite; 1,3-Propanediol, 2-Ethyl-2-(hydroxymethyl)-, Cyclic Phosphite with 2-Ethyl-1-hexanol; Antioxidant TMPP
EINECS	212-535-4

Quality Control

Our Trimethylolpropane Phosphite is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including assay, color, acidity, and moisture content determination, to ensure it meets precise specifications and delivers consistent performance. A Certificate of Analysis (COA) documenting these results is provided with each shipment to guarantee traceability and compliance.

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 should be kept under a dry inert atmosphere (e.g., nitrogen) after opening to prevent oxidation and hydrolysis. Keep away from strong oxidizers and bases.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Acidity (as H3PO4)	≤ 0.5%
Color (APHA)	≤ 100
Moisture (KF)	≤ 0.2%
Phosphorus Content	9.5 - 10.5%
Specific Gravity (20°C)	1.010 - 1.050

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