Description

7-[3-Methoxy-4-(Sulfomethylamino)Phenylazo]-1,3-Naphthalenedisulfonic Acid is a specialized azo dye intermediate characterized by its multiple sulfonic acid groups, which impart excellent water solubility and substantivity. This compound matters as a critical building block for synthesizing high-value, colorfast dyes and pigments used in demanding industrial applications. It is primarily needed by manufacturers in the textile, ink, and specialty chemical sectors seeking to produce vibrant, stable colors with enhanced performance properties.

Application

• Key intermediate for the synthesis of acid dyes and direct dyes used in textile coloring, particularly for nylon, silk, and wool.
• Precursor for manufacturing reactive dyes, offering strong covalent bonds with cellulose fibers like cotton for superior wash-fastness.
• Used in the production of pigments and lake colors for inks, coatings, and plastics, where water solubility of the intermediate is advantageous.
• Potential starting material for biological stains and diagnostic dyes in life sciences due to its azo chromophore structure.
• Intermediate in the synthesis of functional dyes for non-textile applications such as lasers, optical data storage, or solar cells.
• Research and development chemical for novel colorants and photoactive materials in academic and industrial laboratories.

Basic Information

Product Name	7-[3-Methoxy-4-(Sulfomethylamino)Phenylazo]-1,3-Naphthalenedisulfonic Acid
CAS No.	115811-26-2
Molecular Formula	C₁₈H₁₇N₃O₈S₂
Molecular Weight	467.47 g/mol
Synonyms	7-[3-Methoxy-4-(Sulfomethylamino)phenylazo]naphthalene-1,3-disulfonic Acid; 1,3-Naphthalenedisulfonic acid, 7-[2-[4-[(sulfomethyl)amino]-3-methoxyphenyl]diazenyl]-; Azo dye intermediate 115811-26-2; 4-[(Sulfomethyl)amino]-3-methoxyazobenzene-2',4'-disulfonic acid; 3-Methoxy-4-(sulfomethylamino)azobenzene-2,4'-disulfonic acid; Acid Black 210 intermediate; C.I. 28440 intermediate (related).
EINECS	Contact for details

Quality Control

Our production of 7-[3-Methoxy-4-(Sulfomethylamino)Phenylazo]-1,3-Naphthalenedisulfonic Acid adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing to ensure consistency, purity, and compliance with customer specifications. Certificates of Analysis (COA) documenting key parameters such as assay, impurity profile, and physical properties are available upon request 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 a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product stability and handling properties.

Specification

Item	Specification
Appearance	Dark brown to reddish-brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
pH (1% Solution)	2.0 - 4.0
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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