Description

2,5-Diamino-1,3-Benzenedisulfonic Acid is a key aromatic disulfonic acid derivative, serving as a versatile and critical intermediate in advanced organic synthesis. Its bifunctional nature, featuring both amino and sulfonic acid groups, makes it an essential building block for creating complex molecules with specific functional properties. This compound is primarily sought after by manufacturers in the dye and pigment, pharmaceutical, and specialty chemical industries for the production of high-value azo dyes, optical brighteners, and active pharmaceutical ingredients (APIs).

Application

• Dye & Pigment Intermediate: A crucial precursor for synthesizing high-performance azo dyes, acid dyes, and reactive dyes, providing excellent color fastness and solubility.
• Pharmaceutical Synthesis: Used as a building block in the manufacture of certain active pharmaceutical ingredients (APIs) and diagnostic agents.
• Optical Brightener Production: Serves as a key intermediate in the synthesis of stilbene-based optical brighteners used in paper, detergent, and textile industries.
• Corrosion Inhibitor Formulation: Incorporated into specialty chemical formulations designed to protect metals in industrial processes.
• Ligand for Metal Complexation: Utilized in research and industrial processes for metal chelation and catalysis due to its sulfonic acid groups.
• Polymer Modification: Acts as a monomer or additive to introduce sulfonic acid functionality into polymers, enhancing hydrophilicity or ionic character.

Basic Information

Item	Detail
Product Name	2,5-Diamino-1,3-Benzenedisulfonic Acid
CAS No.	6409-48-9
Molecular Formula	C6H8N2O6S2
Molecular Weight	268.27 g/mol
Synonyms	2,5-Diaminobenzene-1,3-disulfonic Acid; 1,3-Benzenedisulfonic acid, 2,5-diamino-; 2,5-Diaminobenzenedisulfonic Acid; 2,5-Diamino-m-benzenedisulfonic Acid; 2,5-Diaminoresorcinoldisulfonic Acid; DAS Acid (common industry name); 2,5-Diamino-1,3-disulfobenzene
EINECS	229-076-5

Quality Control

Every batch of our 2,5-Diamino-1,3-Benzenedisulfonic Acid is produced and tested under a strict quality management system. We ensure compliance with relevant industry standards through rigorous in-process and final product testing, including identity confirmation, purity assay, and impurity profiling. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee traceability and product consistency for your critical applications.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture. Keep away from incompatible materials such as strong acids and organic solvents.

Specification

Item	Specification
Appearance	Off-white to light brown crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual ≤ 0.5%, Total ≤ 1.5%

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