Description

C.I. Acid Red 403 is a synthetic, water-soluble acid dye belonging to the azo chemical class. This high-purity colorant is valued for its strong, vibrant red hue and excellent fastness properties in demanding applications. It is primarily utilized by manufacturers in the textile, leather, and specialty ink industries seeking reliable and consistent coloration.

Application

• Primary dyeing and printing of polyamide (nylon) fibers and textiles.
• Coloration of leather goods, providing rich, even shades.
• Manufacturing of inks for ballpoint pens, stamp pads, and other specialty writing instruments.
• Production of colored paper and paper products.
• As a colorant for certain types of wood stains and coatings.
• Potential use in the coloration of soaps and detergents (subject to regional regulatory approval).

Basic Information

Product Name	C.I. Acid Red 403
CAS No.	77907-19-8
Molecular Formula	C22H14N4Na2O7S2
Molecular Weight	556.48 g/mol
Synonyms	Acid Red 403; C.I. 17905; Acid Leather Red G; Nylosan Red F-3GL; Telon Red F-3GL; Acid Fast Red A; Amido Naphthol Red G; Sodium 4-hydroxy-3-[(2-methoxyphenyl)azo]naphthalene-1-sulphonate
EINECS	Contact for details

Quality Control

Our production of C.I. Acid Red 403 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Each lot is analyzed for critical parameters including color strength, shade, solubility, and impurity profile. Certificates of Analysis (COA) documenting these results are available upon request to support your quality assurance processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. The product is light-sensitive and should be stored away from direct light exposure.

Specification

Item	Specification
Appearance	Red to dark red powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Solubility	Clear solution at 1%
Ash Content	≤ 1.0%

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