Description

5-Amino-1-Naphthalenesulfonic Acid is a key aromatic sulfonic acid derivative, also known as Laurent's Acid, serving as a vital intermediate in the synthesis of complex organic molecules. Its primary commercial value lies in its role as a versatile coupling component and diazo component for the production of high-value azo dyes and pigments. This compound is essential for manufacturers in the dye and pigment industry, as well as for research institutions developing specialized optical materials and analytical reagents. Its consistent quality and reliable supply are critical for ensuring batch-to-batch reproducibility in downstream synthesis processes.

Application

• Primary intermediate for the synthesis of azo dyes and pigments, imparting specific color properties.
• Coupling agent in the production of dyes for textiles, leather, and paper.
• Key starting material for manufacturing specialized pigments used in inks and coatings.
• Precursor in organic synthesis for creating more complex sulfonated aromatic compounds.
• Used in research and development of fluorescent markers and optical brightening agents.
• Potential intermediate in the synthesis of certain pharmaceuticals and agrochemicals.

Basic Information

Product Name	5-Amino-1-Naphthalenesulfonic Acid
CAS No.	84-89-9
Molecular Formula	C10H9NO3S
Molecular Weight	223.25 g/mol
Synonyms	Laurent's Acid; 1-Naphthylamine-5-sulfonic Acid; 5-Amino-1-naphthalenesulfonic acid; 1-Aminonaphthalene-5-sulfonic Acid; 5-Amino-1-naphthalenesulphonic acid; 1-Naphthalenesulfonic acid, 5-amino-; 5-Amino-1-naphthalenesulfonate
EINECS	201-571-3

Quality Control

Our 5-Amino-1-Naphthalenesulfonic Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards and consistent specifications suitable for industrial synthesis. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles 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, and well-ventilated place at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality.

Specification

Item	Specification
Appearance	Off-white to light gray powder or crystals
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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