Description

Sodium 4,4'-Diaminostilbene-2,2'-Disulphonate is a high-purity, water-soluble organic intermediate with significant industrial importance. Its core value lies in its role as a key building block for the synthesis of optical brighteners, fluorescent whitening agents, and specialized dyes. This compound is essential for manufacturers in the textile, paper, detergent, and plastics industries seeking to enhance product whiteness and brightness. We supply this critical intermediate with a focus on consistent quality and reliable global supply chains.

Application

• Primary raw material for the synthesis of Fluorescent Whitening Agents (FWAs) and Optical Brightening Agents (OBAs).
• Key intermediate in the production of triazine-stilbene type brighteners for paper and detergent applications.
• Building block for brighteners used in the textile industry, particularly for cotton and synthetic fibers.
• Precursor for specialty dyes and photo-sensitive materials.
• Used in research and development of advanced organic luminescent compounds.
• Intermediate for chemicals used in the plastics and polymer industry to improve visual appeal.

Basic Information

Product Name	Sodium 4,4'-Diaminostilbene-2,2'-Disulphonate
CAS No.	25394-13-2
Molecular Formula	C14H12N2Na2O6S2
Molecular Weight	438.36 g/mol
Synonyms	4,4'-Diaminostilbene-2,2'-disulfonic acid disodium salt; DAS; Sodium DAS; Disodium 4,4'-diaminostilbene-2,2'-disulfonate; 4,4'-Diamino-2,2'-stilbenedisulfonic acid disodium salt; Tinopal DMS; Fluorescent Brightener DMS; Blankophor DMS; CAS 25394-13-2
EINECS	246-941-8

Quality Control

Our Sodium 4,4'-Diaminostilbene-2,2'-Disulphonate is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color, and solubility. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay, moisture content, and impurity profiles. Our quality commitment ensures batch-to-batch consistency for your critical synthesis processes.

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 after opening to prevent absorption of atmospheric moisture. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to light yellow powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Moisture (KF)	≤ 2.0%
Solubility (in Water)	Clear, yellow solution
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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