Description

4,4'-Dihydrazinostilbene-2,2'-Disulphonic Acid is a high-purity, reactive organic intermediate characterized by its dihydrazine and disulfonic acid functional groups. This compound matters for its role as a critical building block in the synthesis of complex molecules, particularly optical brighteners and fluorescent whitening agents (FWAs). It is essential for manufacturers in the textile, paper, and detergent industries seeking to enhance product brightness and whiteness. Its consistent quality and reactivity make it a key component for producing high-performance additives.

Application

• Primary intermediate in the synthesis of triazine-stilbene type Optical Brightening Agents (OBAs) and Fluorescent Whitening Agents (FWAs).
• Key raw material for whitening agents used in detergent formulations and laundry care products.
• Manufacturing of brightening agents for the paper and pulp industry to achieve high-grade whiteness.
• Production of additives for textile finishing to improve the brightness of synthetic fibers like polyester and nylon.
• Used in research and development of specialty dyes and pigments.
• Potential intermediate for pharmaceutical and agrochemical active ingredient synthesis.

Basic Information

Product Name	4,4'-Dihydrazinostilbene-2,2'-Disulphonic Acid
CAS No.	26092-49-9
Molecular Formula	C₁₄H₁₆N₄O₆S₂
Molecular Weight	392.43 g/mol
Synonyms	DAS; DSD Acid Dihydrazide; 4,4'-Diaminostilbene-2,2'-disulfonic acid dihydrazide; Dihydrazinostilbenedisulfonic Acid; 2,2'-(1,2-Ethenediyl)bis[5-hydrazinylbenzenesulfonic acid]; 4,4'-Bis(hydrazino)-2,2'-stilbenedisulfonic acid; DSD Dihydrazide; Optical Brightener Intermediate OB-1
EINECS	Contact for details

Quality Control

Our 4,4'-Dihydrazinostilbene-2,2'-Disulphonic Acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting industry specifications. We provide comprehensive Certificates of Analysis (COA) with each shipment to guarantee traceability and batch-to-batch consistency, supporting your quality assurance and regulatory compliance needs.

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 and easily oxidized nature, the container must be kept tightly sealed under an inert atmosphere after opening to prevent moisture absorption and degradation. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Yellow to light brown crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 2.0%

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