Description

4-[[4-[(4-Amino-1-Naphtyl)Azo]-6-Sulfo-1-Naphtyl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt is a high-purity, water-soluble disazo dye intermediate of significant industrial importance. This compound is valued for its ability to impart strong, stable coloration and is a critical precursor in the synthesis of specialized dyes and pigments. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries seeking reliable and consistent raw materials for high-performance colorant production.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a key building block in the synthesis of complex, high-molecular-weight disazo dyes, particularly for textile applications requiring deep shades and good fastness properties.
• Textile Dye Manufacturing: Used in the production of dyes for coloring natural and synthetic fibers, including cotton, wool, and nylon, where its sulfonic acid groups ensure good water solubility and fiber affinity.
• Inkjet and Printing Ink Formulations: Employed in the manufacture of colorants for inks where precise color strength and stability are critical for print quality and longevity.
• Specialty Chemical Synthesis: Acts as a functional intermediate in organic synthesis for research and development of novel chromophores and light-absorbing materials.
• Laboratory Reagent & Analytical Standard: Supplied as a high-purity standard for analytical testing, quality control, and research purposes in chemical laboratories.

Basic Information

Item	Details
Product Name	4-[[4-[(4-Amino-1-Naphtyl)Azo]-6-Sulfo-1-Naphtyl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt
CAS No.	6548-25-0
Molecular Formula	C30H20N6Na2O6S2
Molecular Weight	678.62 g/mol
Synonyms	Direct Black 38 (disodium salt); C.I. 30235; Direct Deep Black EW; 4-[[4-[(4-Amino-1-naphthyl)azo]-6-sulfo-1-naphthyl]azo]-1-naphthalenesulfonic acid disodium salt; 1,5-Naphthalenedisulfonic acid, 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[4-amino-, disodium salt; Benzo Fast Black G; Direct Black A; Pontamine Black E
EINECS	229-476-2

Quality Control

Our production of 4-[[4-[(4-Amino-1-Naphtyl)Azo]-6-Sulfo-1-Naphtyl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt adheres to stringent quality management protocols to ensure batch-to-batch consistency and purity. Every lot is analyzed against comprehensive specifications, including identity confirmation, assay, and impurity profiling. Certificates of Analysis (COA) documenting these results are provided to guarantee the material meets the technical requirements for your specific application.

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 light-sensitive (store away from light) and hygroscopic (moisture-sensitive); prolonged exposure to air, moisture, or direct light should be avoided to maintain stability and purity.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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