Description

Acid Orange 7 is a synthetic anionic azo dye renowned for its vibrant orange hue and excellent dyeing properties. This high-performance colorant is essential for achieving consistent, durable coloration across a wide range of industrial substrates. It is a critical raw material for manufacturers in the textile, leather, paper, and ink industries seeking reliable and cost-effective dye solutions. The product is supplied under the identifier CAS NO 633-96-5.

Application

Acid Orange 7 is a versatile dye with primary applications in industries requiring strong, wash-fast coloration for protein-based and synthetic materials.

• Textile Dyeing: Primarily used for dyeing wool, silk, and nylon fibers, providing excellent color yield and levelness.
• Leather Coloring: Applied in the staining and finishing of leather goods, offering rich and uniform shades.
• Paper Industry: Used for coloring paper products, including specialty papers and packaging materials.
• Ink Manufacturing: Serves as a colorant in the formulation of inks for various printing applications.
• Biological Staining: Employed in histology and microscopy as a stain for tissue samples.
• Detergent & Soap Coloring: Used to impart color to household and industrial cleaning products.

Basic Information

Product Name	Acid Orange 7
CAS No.	633-96-5
Molecular Formula	C16H11N2NaO4S
Molecular Weight	350.32 g/mol
Synonyms	Acid Orange 7; Acid Orange II; C.I. 15510; Sodium 4-[(2-hydroxy-1-naphthyl)azo]benzenesulfonate; Orange II; Tropaeolin D; Wool Orange; Naphthalene Orange; Acid Leather Orange; EINECS 211-199-0
EINECS	211-199-0

Quality Control

Our Acid Orange 7 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. Quality is verified through comprehensive testing including spectrophotometric analysis for color strength and purity, as well as tests for insolubles and heavy metal content. We provide full traceability and Certificates of Analysis (COA) are available for every shipment to confirm compliance with agreed specifications.

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). Keep away from strong oxidizing agents and incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to standard
Assay (Color Strength)	≥ 95%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Shade	Matches reference standard

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