Description

Diisobutyl Phosphite is an organophosphorus compound widely used as a versatile intermediate and stabilizer in industrial chemistry. Its primary value lies in its ability to act as an effective antioxidant and metal deactivator, protecting materials from degradation. This makes it a critical component for manufacturers in the polymer, lubricant, and specialty chemical industries seeking to enhance product longevity and performance under oxidative stress.

Application

• Primary use as an antioxidant and stabilizer in polymers and plastics, including PVC and polyolefins.
• Key intermediate in the synthesis of other organophosphorus compounds, such as phosphonates and phosphate esters.
• Effective metal deactivator and corrosion inhibitor in industrial lubricants and hydraulic fluids.
• Used as a reducing agent and catalyst ligand in various organic synthesis processes.
• Component in specialty formulations for flame retardants and epoxy resin curing agents.
• Stabilizing agent for adhesives, sealants, and synthetic rubbers to prevent premature aging.

Basic Information

Product Name	Diisobutyl Phosphite
CAS No.	1189-24-8
Molecular Formula	C8H19O3P
Molecular Weight	194.21 g/mol
Synonyms	Bis(2-methylpropyl) phosphite; Phosphorous acid, bis(2-methylpropyl) ester; Diisobutyl phosphonate (common name); DIOP; Isobutyl phosphite; 2-Methylpropyl phosphite; P,P-Bis(2-methylpropoxy)phosphinous acid
EINECS	214-719-6

Quality Control

Our Diisobutyl Phosphite is produced under a stringent quality management system to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including assay, identity confirmation, and impurity profiling. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee compliance with your technical requirements and industry standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area under an inert atmosphere (e.g., nitrogen) to prevent oxidation. Recommended storage temperature is between 15°C and 25°C. Keep away from heat, sparks, open flames, and strong oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms
Assay (GC)	≥ 98.0 %
Refractive Index (n20/D)	1.420 - 1.425
Density (20°C)	0.950 - 0.970 g/mL
Acidity (as H3PO4)	≤ 0.5 %
Water Content (KF)	≤ 0.1 %

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