Description

Sulfanilic Acid CAS NO 121-57-3 is a versatile organic compound, primarily known as an important intermediate in the synthesis of azo dyes and pigments. Its significance lies in its dual functionality, containing both an aromatic amine and a sulfonic acid group, which makes it a key building block for colorants and other fine chemicals. This product is essential for manufacturers in the dye and pigment industry, as well as for laboratories and chemical synthesis operations requiring a high-purity aromatic sulfonic acid.

Application

• Azo Dye & Pigment Manufacturing: Serves as a crucial diazo component for producing a wide range of orange, red, and brown dyes for textiles, leather, and paper.
• Chemical Synthesis Intermediate: Used in the production of sulfa drugs, optical brighteners, and other specialty organic compounds.
• Analytical Reagent: Employed in analytical chemistry, notably in the Griess test for the detection of nitrites.
• Corrosion Inhibitor Formulation: Acts as a component in certain industrial corrosion inhibitor blends.
• Photographic Chemical: Used in some photographic development processes.
• Research & Development: A standard reagent in organic chemistry research and pharmaceutical development labs.

Basic Information

Product Name	Sulfanilic Acid
CAS No.	121-57-3
Molecular Formula	C6H7NO3S
Molecular Weight	173.19 g/mol
Synonyms	4-Aminobenzenesulfonic Acid; Aniline-4-sulfonic Acid; p-Aminobenzenesulfonic Acid; Sulphanilic Acid; 4-Sulfoaniline; Benzenesulfonic acid, 4-amino-; Para-aminobenzenesulfonic acid
EINECS	204-482-5

Quality Control

Our Sulfanilic Acid is produced and tested under a stringent quality management system to ensure batch-to-batch consistency and high purity. We provide comprehensive quality documentation, including detailed Certificates of Analysis (COA) for each lot, which verify key parameters such as assay, moisture content, and impurity levels. Our quality commitment aligns with industrial and reagent-grade standards to meet the specific needs of our B2B clients.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents and strong bases.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (Titration)	≥ 98.0 %
Loss on Drying	≤ 0.5 %
Residue on Ignition (Sulfated Ash)	≤ 0.1 %
Heavy Metals (as Pb)	≤ 20 ppm

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