Description

4-Hydroxy-5-[(2-Hydroxynaphthyl)Azo]-3-[(2-Hydroxy-3-Nitro-5-Sulphophenyl)Azo]Naphthalene-2,7-Disulphonic Acid is a high-purity, complex disazo dye intermediate essential for producing vibrant and stable colorants. Its value lies in its ability to impart specific, durable shades, particularly in demanding technical applications where color fastness and chemical stability are critical. This product is primarily needed by manufacturers in the textile, leather, and specialty ink industries seeking to formulate high-performance dyes and pigments.

Application

• Textile Dyeing: A key intermediate for synthesizing acid dyes and direct dyes used on wool, silk, nylon, and other polyamide fibers.
• Leather Coloring: Used in the production of dyes for coloring leather goods, offering good penetration and fastness properties.
• Specialty Inks: Serves as a precursor for pigments in high-performance inks, including those for security printing and packaging.
• Paper Dyeing: Employed in the manufacture of dyes for coloring paper products where specific color tones are required.
• Research & Development: Used as a standard or building block in chemical research for developing new chromophores and functional dyes.
• Functional Dyes: Potential intermediate for dyes used in non-textile applications such as sensors or light-absorbing materials.

Basic Information

Product Name	4-Hydroxy-5-[(2-Hydroxynaphthyl)Azo]-3-[(2-Hydroxy-3-Nitro-5-Sulphophenyl)Azo]Naphthalene-2,7-Disulphonic Acid
CAS No.	61670-11-9
Molecular Formula	C₂₆H₁₆N₄O₁₂S₂
Molecular Weight	640.56 g/mol
Synonyms	C.I. Acid Black 132; Acid Black 132; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-5-[(2-hydroxy-1-naphthalenyl)azo]-3-[(2-hydroxy-3-nitro-5-sulfophenyl)azo]-; C.I. 15711; Disazo dye intermediate; 4-Hydroxy-5-(2-hydroxynaphthylazo)-3-(2-hydroxy-3-nitro-5-sulfophenylazo)naphthalene-2,7-disulfonic acid; Black 132 (Acid)
EINECS	Contact for details

Quality Control

Our 4-Hydroxy-5-[(2-Hydroxynaphthyl)Azo]-3-[(2-Hydroxy-3-Nitro-5-Sulphophenyl)Azo]Naphthalene-2,7-Disulphonic Acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity, identity, and performance as a dye intermediate. Certificates of Analysis (COA) detailing key specifications such as assay, impurity profile, and color strength are available upon request 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 product is hygroscopic (moisture-sensitive) and light-sensitive; therefore, containers must be kept tightly sealed after opening to minimize exposure to atmospheric moisture and light, which can affect product stability.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Sulfated Ash	≤ 1.0%
Solubility (Water)	Soluble, clear solution

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