Description

Acid Orange 3 is a synthetic monoazo acid dye widely used for its vibrant color and good fastness properties. This dye is valued for its ability to impart a bright orange hue to protein-based fibers like wool, silk, and nylon, as well as for coloring leather and paper. It is an essential component for manufacturers in the textile, leather finishing, and specialty paper industries seeking reliable and consistent colorants. The compound is identified by CAS No. 6373-74-6.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve bright orange shades.
• Leather Coloring: Used in the finishing process to color leather goods, providing good penetration and color uniformity.
• Paper Staining: Employed for coloring paper products, including specialty papers and packaging materials.
• Biological Staining: Can be used as a histological stain in laboratory settings for microscopic analysis.
• Ink Formulation: A colorant component in the manufacture of certain inks and toners.
• Wood Staining: Applied for decorative coloring of wood and related materials.

Basic Information

Item	Detail
Product Name	Acid Orange 3
CAS No.	6373-74-6
Molecular Formula	C12H9N2NaO4S
Molecular Weight	300.26 g/mol
Synonyms	Acid Orange 3; C.I. Acid Orange 3; C.I. 10385; Tropaeolin O; Orange II; Acid Orange GG; Sodium 4-[(2,4-dihydroxyphenyl)azo]benzenesulfonate; 4-[(2,4-Dihydroxyphenyl)azo]benzenesulfonic acid sodium salt
EINECS	228-925-0

Quality Control

Our Acid Orange 3 is manufactured under strict quality control protocols to ensure batch-to-batch consistency and high purity. Quality is verified through a series of analytical tests including identification, assay, and impurity profiling. A Certificate of Analysis (COA) detailing specific results for each parameter is provided with every shipment to guarantee compliance with your 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 incompatible materials. This product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Loss on Drying	Max. 5.0%
Water Solubility	Freely soluble
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	Max. 20 ppm

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