Description

Tris-(Dipropyleneglycol)-Phosphite is a high-performance organophosphite antioxidant and stabilizer. This compound is critical for protecting polymers and other sensitive materials from oxidative degradation and thermal breakdown during processing and long-term use. It is an essential additive for manufacturers in the plastics, synthetic fiber, and specialty chemical industries seeking to enhance product durability and performance.

Application

• Primary antioxidant and process stabilizer for polyolefins (PP, PE) and engineering plastics.
• Synergistic co-stabilizer in combination with phenolic antioxidants to extend polymer service life.
• Color and melt flow stabilizer during the high-temperature processing of polymers.
• Stabilizer component in synthetic lubricants and hydraulic fluids to prevent oxidation.
• Intermediate for the synthesis of more complex phosphite-based specialty chemicals.
• Additive in adhesive and sealant formulations to improve thermal aging resistance.

Basic Information

Product Name	Tris-(Dipropyleneglycol)-Phosphite
CAS No.	26259-91-6
Molecular Formula	C21H45O9P
Molecular Weight	472.55 g/mol
Synonyms	Tris(dipropylene glycol) phosphite; Phosphorous acid, tris(2-(2-hydroxypropoxy)propyl) ester; Tris(2-(2-hydroxypropoxy)propyl) phosphite; Dipropylene glycol phosphite; Antioxidant TNPP analog; Polymeric phosphite stabilizer; Oligomeric phosphite
EINECS	247-530-6

Quality Control

Our Tris-(Dipropyleneglycol)-Phosphite is manufactured under a stringent quality management system. Each batch is analyzed to ensure it meets precise chemical and physical specifications, including assay, color, acidity, and refractive index. Certificates of Analysis (COA) documenting full compliance are provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizers and moisture. Under these conditions, the product remains stable for extended periods.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Acidity (as H3PO4)	≤ 0.1%
Color (APHA)	≤ 50
Refractive Index (n20D)	1.455 - 1.465
Density (20°C)	1.10 - 1.15 g/cm³
Water Content (KF)	≤ 0.1%

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