Description

2,7-Naphthalenedisulfonic Acid, 4-[[4-[(4-Amino-1-Naphthalenyl) Azo]-1-Naphthalenyl]Azo]-, Disodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its value lies in its ability to impart a strong, stable color and serve as a versatile building block for synthesizing more complex dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking reliable intermediates for colorant production.

Application

• Primary Intermediate for Azo Dyes: Serves as a key precursor in the synthesis of acid dyes and direct dyes, particularly for coloring polyamide fibers like nylon and wool.
• Textile Dye Manufacturing: Used to produce dyes that offer good wash and light fastness on natural and synthetic fabrics.
• Ink and Pigment Production: Employed in the formulation of inks for writing, printing, and packaging, as well as in the creation of organic pigments.
• Research & Development: Utilized in chemical research labs for developing new chromophores and studying dye-sensitized processes.
• Specialty Chemical Synthesis: Acts as a functional intermediate for creating complex molecules used in analytical reagents or light-absorbing materials.

Basic Information

Item	Detail
Product Name	2,7-Naphthalenedisulfonic Acid, 4-[[4-[(4-Amino-1-Naphthalenyl) Azo]-1-Naphthalenyl]Azo]-, Disodium Salt
CAS No.	13011-56-8
Molecular Formula	C30H18N6Na2O6S2
Molecular Weight	668.61 g/mol
Synonyms	Direct Blue 2B; C.I. 22610; Direct Blue 2BN; 4-[[4-[(4-Amino-1-naphthyl)azo]-1-naphthyl]azo]-2,7-naphthalenedisulfonic acid disodium salt; Amanil Sky Blue FF; Azo Blue 2B; Benzo Sky Blue; Columbia Blue FF
EINECS	235-862-3

Quality Control

Our production of 2,7-Naphthalenedisulfonic Acid, 4-[[4-[(4-Amino-1-Naphthalenyl) Azo]-1-Naphthalenyl]Azo]-, Disodium Salt adheres to stringent quality protocols to ensure batch-to-batch consistency and high purity. Each lot is tested against rigorous in-house specifications, which include identity confirmation, assay, and impurity profiling. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. The material is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Dark blue to bluish-black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
Water Solubility	Freely soluble

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