Description

o-Tolidine is a high-purity aromatic diamine compound, widely recognized as a critical chemical intermediate and reagent in industrial and analytical chemistry. Its primary commercial value lies in its ability to serve as a versatile precursor for dyes, pigments, and specialized polymers, as well as its historical use in colorimetric detection methods. This product is essential for manufacturers and R&D laboratories in the chemical synthesis, specialty materials, and diagnostic sectors seeking a reliable and consistent raw material.

Application

• Dye and Pigment Manufacturing: A key intermediate in the synthesis of azo dyes and organic pigments, imparting color and stability to textiles, inks, and plastics.
• Polymer and Resin Production: Used as a curing agent or chain extender in the manufacture of polyurethanes, epoxies, and other high-performance polymers.
• Analytical Chemistry Reagent: Historically employed as a sensitive chromogenic agent for the detection of chlorine, cyanide, and certain metals in water and environmental analysis.
• Chemical Synthesis Intermediate: Serves as a building block for more complex organic compounds in pharmaceutical and agrochemical research.
• Research & Development: Utilized in academic and industrial labs for developing new catalytic systems and functional materials.

Basic Information

Product Name	o-Tolidine
CAS No.	119-93-7
Molecular Formula	C14H16N2
Molecular Weight	212.29 g/mol
Synonyms	3,3'-Dimethylbenzidine; 4,4'-Diamino-3,3'-dimethylbiphenyl; o-Tolidin; Bianisidine; 3,3'-Dimethyl-4,4'-diaminobiphenyl; 3,3'-Dimethyl-[1,1'-biphenyl]-4,4'-diamine; Fast Dark Blue Base R; C.I. 37230
EINECS	204-358-0

Quality Control

Our o-Tolidine is produced under a stringent quality management system to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including identification, assay, and impurity profiling. A detailed Certificate of Analysis (COA) documenting purity, physical characteristics, and test results is provided with every shipment to support your quality assurance protocols.

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 heat, sparks, and open flame. Due to its light-sensitive nature, containers should be kept in the original packaging or an opaque secondary container until use.

Specification

Item	Specification
Appearance	White to light tan crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	129°C - 132°C
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%

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