Description

Phosphorous Acid,Tris(1,1-Dimethylethyl) Ester is a sterically hindered organophosphorus compound, widely recognized for its role as a highly effective stabilizer and antioxidant in polymer chemistry. Its primary commercial value lies in its ability to prevent thermal and oxidative degradation, thereby extending the service life and maintaining the performance integrity of sensitive materials. This product is essential for manufacturers in the plastics, rubber, and specialty chemical industries who require advanced additive solutions for high-performance applications.

Application

• Polymer Stabilizer: Acts as a primary or secondary antioxidant and phosphite processing stabilizer for polyolefins (PP, PE), engineering plastics, and synthetic rubbers to prevent thermal degradation during processing and long-term use.
• Synergistic Additive Systems: Used in combination with phenolic antioxidants to create highly efficient stabilization packages that enhance color retention and mechanical property preservation.
• Intermediate for Specialty Chemicals: Serves as a key building block in the synthesis of more complex phosphite and phosphate derivatives used as ligands, flame retardants, or other functional additives.
• Lubricant and Fuel Additive: Employed as an antioxidant additive in advanced lubricant formulations and synthetic fuels to inhibit oxidation and sludge formation.
• Photoresist and Electronic Materials: Finds application in the formulation of advanced photoresists and other electronic chemicals where high purity and stability are critical.

Basic Information

Product Name	Phosphorous Acid,Tris(1,1-Dimethylethyl) Ester
CAS No.	15205-62-6
Molecular Formula	C12H27O3P
Molecular Weight	250.32 g/mol
Synonyms	Tris(tert-butyl) Phosphite; Tris(1,1-dimethylethyl) Phosphite; Tris-tert-butyl Phosphite; Tert-Butyl Phosphite (TBP); Phosphorous Acid Tri-tert-butyl Ester; 2-Methyl-2-propanol Phosphite (3:1); Antioxidant TBP; Hostanox PAR 24; Irgafos TNPP Alternative; Doverphos S-480
EINECS	239-254-2

Quality Control

Our production of Phosphorous Acid,Tris(1,1-Dimethylethyl) Ester adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed against rigorous internal specifications, which typically include assessment of assay, color, acidity, and specific impurity profiles. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance and regulatory compliance needs.

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 material is easily oxidized; for long-term storage, maintaining an inert atmosphere (nitrogen blanket) is recommended to preserve efficacy. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (GC or HPLC)	≥ 97.0%
Color (APHA)	≤ 50
Acidity (as H3PO3)	≤ 0.1%
Water Content (KF)	≤ 0.1%
Refractive Index (n20D)	1.435 - 1.445
Density (20°C)	0.92 - 0.96 g/cm³

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