Description

2,7-Naphthalenedisulfonic Acid Disodium Salt is a high-purity, water-soluble aromatic sulfonate salt valued for its role as a key intermediate and functional additive in advanced chemical synthesis. Its disulfonic acid structure provides excellent solubility and ionic character, making it a versatile building block for dyes, optical brighteners, and specialty polymers. This product is essential for manufacturers and R&D laboratories in the dye, textile, photographic, and fine chemical industries seeking reliable quality and consistent performance.

Application

• Dye and Pigment Intermediate: A crucial precursor in the synthesis of acid dyes, direct dyes, and fluorescent brightening agents (FBAs) for textiles and paper.
• Optical Brightener Production: Serves as a core starting material for manufacturing stilbene-based optical brighteners used in detergents, plastics, and coatings.
• Chemical Synthesis: Acts as a sulfonation agent and anionic moiety introducer in organic synthesis for pharmaceuticals and specialty chemicals.
• Electroplating Additive: Used in electroplating baths as a brightener and leveling agent to improve metal deposit quality.
• Photographic Chemicals: Employed in the formulation of certain photographic developers and sensitizers.
• Research & Development: Utilized in academic and industrial R&D for studying sulfonation reactions and developing new functional materials.

Basic Information

Product Name	2,7-Naphthalenedisulfonic Acid Disodium Salt
CAS No.	1655-35-2
Molecular Formula	C10H6Na2O6S2
Molecular Weight	332.24 g/mol
Synonyms	2,7-Naphthalenedisulfonic Acid Sodium Salt; Disodium 2,7-Naphthalenedisulfonate; 2,7-NDS Disodium Salt; Acid Yellow 76 Intermediate; Naphthalene-2,7-disulfonic Acid Disodium Salt; C.I. 23850; 2,7-NDSA Disodium Salt
EINECS	216-759-1

Quality Control

Our 2,7-Naphthalenedisulfonic Acid Disodium Salt is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, identity, and consistency. A detailed Certificate of Analysis (COA) is provided with every shipment, documenting key parameters such as assay, impurity profile, and physical properties to support your quality assurance protocols.

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). This material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
pH (5% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Freely soluble in water

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