Description

O,o-Diisodecyl Hydrogen Dithiophosphate is a high-performance organophosphorus compound widely utilized as an extreme pressure (EP) additive and anti-wear agent. Its primary value lies in its ability to form protective tribofilms on metal surfaces, significantly reducing friction and wear under severe operating conditions. This makes it an essential component for formulators and manufacturers in the lubricant and metalworking fluid industries seeking to enhance equipment durability and performance.

Application

• As a key extreme pressure (EP) additive in industrial gear oils, hydraulic fluids, and compressor oils.
• As an anti-wear agent in metalworking fluids, including cutting oils, grinding fluids, and drawing compounds.
• As a multifunctional additive in lubricant formulations for heavy-duty machinery and automotive applications.
• As a corrosion inhibitor and friction modifier in specialty lubricants and greases.
• In the formulation of fire-resistant hydraulic fluids (e.g., phosphate ester-based fluids).
• As a synergistic component in additive packages containing zinc dialkyldithiophosphates (ZDDP) or other phosphorus/sulfur compounds.

Basic Information

Product Name	O,o-Diisodecyl Hydrogen Dithiophosphate
CAS No.	28631-44-9
Molecular Formula	C20H43O2PS2
Molecular Weight	410.64 g/mol
Synonyms	Diisodecyl Dithiophosphoric Acid; Dithiophosphoric Acid O,O-Diisodecyl Ester; Diisodecyl Hydrogen Dithiophosphate; Phosphorodithioic Acid O,O-Bis(8-methylnonyl) Ester; O,O-Diisodecyl Phosphorodithioate; Isodecyl Dithiophosphate; Additive T321 (related industrial designation).
EINECS	249-149-7

Quality Control

Our O,o-Diisodecyl Hydrogen Dithiophosphate is manufactured under a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure consistent composition, purity, and performance characteristics. A comprehensive Certificate of Analysis (COA) detailing assay, acidity, and key physical properties is provided with each shipment to guarantee it meets your specific formulation requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from heat sources and incompatible materials. Recommended storage temperature is between 15°C and 25°C. Keep container tightly sealed when not in use to minimize moisture absorption and oxidation.

Specification

Item	Specification
Appearance	Clear, pale yellow to amber liquid
Identification (IR)	Conforms
Assay (Titration)	≥ 95.0%
Acidity (as H3PO4)	≤ 0.5%
Water Content (KF)	≤ 0.2%
Specific Gravity (20°C)	0.92 - 0.96
Viscosity (40°C)	Report
Phosphorus Content	Report
Sulfur Content	Report

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