Description

Acid Red 18 is a synthetic, water-soluble azo dye belonging to the acid dye class, widely recognized for its bright red color. It is valued for its strong affinity for protein fibers like wool, silk, and nylon, providing vibrant and wash-fast coloration. This dye is essential for manufacturers in the textile, leather, and paper industries seeking reliable and cost-effective red colorants. Its consistent quality makes it suitable for applications requiring precise color matching and durability.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve bright red shades.
• Leather Finishing: Used for coloring leather goods, providing rich and uniform coloration.
• Paper Staining: Employed in the production of colored papers, tissues, and specialty packaging.
• Ink Formulation: A key component in the manufacture of inks for markers, stamp pads, and other specialty applications.
• Biological Staining: Utilized in histology and microscopy as a staining agent for tissue samples.
• Food Contact Material Coloring: For coloring materials that come into contact with food, where compliant grades are available.

Basic Information

Product Name	Acid Red 18
CAS No.	2611-82-7
Molecular Formula	C20H11N2Na3O10S3
Molecular Weight	604.48 g/mol
Synonyms	Acid Red 18; Food Red 7; C.I. 16255; Ponceau 4R; Cochineal Red A; New Coccine; E124; FD&C Red No. 4; 1-(4-Sulfo-1-naphthylazo)-2-naphthol-6,8-disulfonic acid trisodium salt
EINECS	220-036-2

Quality Control

Our Acid Red 18 is manufactured under a strict quality management system to ensure batch-to-batch consistency and purity. Quality is verified through comprehensive analytical testing, including spectrophotometric analysis, chromatography, and wet chemistry methods. We provide full traceability and Certificates of Analysis (COA) with each shipment, detailing key parameters such as color strength, purity, and impurity profiles. Our production adheres to relevant industry standards for colorants.

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 hygroscopic (moisture-sensitive); ensure the container is sealed after each use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Red to dark red powder or granules
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Assay (HPLC)	≥ 85%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.2%
Heavy Metals (as Pb)	≤ 20 ppm
Arsenic (As)	≤ 3 ppm
Subsidiary Dyes	≤ 2.0%
pH (1% Solution)	6.5 - 8.5

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