Description

Acid Orange 33 is a synthetic anionic dye belonging to the azo dye class, widely recognized for its vibrant orange hue and good lightfastness. This product is valued for its strong affinity to protein fibers like wool and silk, as well as its compatibility with polyamide, making it a critical component for achieving consistent and durable coloration. It is primarily utilized by manufacturers in the textile, leather, and paper industries seeking reliable and cost-effective dyeing solutions. Our supply of Acid Orange 33 CAS NO 6507-77-3 is backed by stringent quality control to ensure batch-to-batch consistency for industrial applications.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve bright orange shades with good wash and light fastness.
• Leather Coloring: Used in the dyeing of leather goods, providing rich and uniform color penetration.
• Paper Staining: Employed for coloring paper products, including specialty papers and packaging materials.
• Ink Formulation: A colorant component in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Polymer Coloring: Suitable for mass coloration of certain synthetic polymers and plastics.

Basic Information

Product Name	Acid Orange 33
CAS No.	6507-77-3
Molecular Formula	C₁₆H₁₁N₃Na₂O₈S₂
Molecular Weight	499.38 g/mol
Synonyms	Acid Orange R; C.I. Acid Orange 33; Acid Leather Orange R; Acid Fast Orange R; Acid Orange A; 6-Hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-2-naphthalenesulfonic acid disodium salt; Wool Orange R; Naphthalene Orange G
EINECS	229-408-2

Quality Control

Our Acid Orange 33 is manufactured under a strict quality management system to ensure it meets the high standards required for industrial dyeing processes. Every batch is tested for critical parameters including color strength, shade, solubility, and impurity profile to guarantee performance consistency. While produced to general industrial grade specifications, we can provide material with tailored purity levels upon request. A Certificate of Analysis (COA) detailing assay, physical properties, and conformance to specification is available for each shipment.

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 heat sources and incompatible materials. Due to its light-sensitive nature (store away from light), prolonged exposure to direct light should be avoided to prevent degradation.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to standard
Assay (Color Strength)	≥ 95% (Typical 98-102%)
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
pH (1% Solution)	6.0 - 8.0
Ash Content	≤ 30%
Heavy Metals (as Pb)	≤ 20 ppm

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