Description

Acid Red 251 is a synthetic organic dye belonging to the azo chemical class, known for its vibrant red color and good fastness properties. This high-performance colorant is valued for its ability to provide consistent, intense coloration in demanding industrial applications. It is primarily utilized by manufacturers in the textile, leather, and specialty ink industries seeking reliable and durable red shades.

Application

• Textile Dyeing: Used for dyeing nylon, wool, and silk fibers, offering good wash and light fastness.
• Leather Finishing: Applied in the coloration of leather goods, providing rich and uniform red tones.
• Ink Manufacturing: Serves as a colorant for specialty inks, including those for packaging and security printing.
• Paper Staining: Employed for tinting high-grade papers and decorative paper products.
• Plastics and Polymers: Used to color certain types of plastics where compatible with the polymer matrix.
• Biological Staining: May find application as a histological stain in laboratory settings.

Basic Information

Product Name	Acid Red 251
CAS No.	61724-39-8
Molecular Formula	C22H14N4Na2O7S2
Molecular Weight	556.48 g/mol
Synonyms	Acid Red 251; C.I. Acid Red 251; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-, disodium salt; Acid Leather Red G; Nylosan Red F-3GL; Telon Red F3GL; Supranol Red GW; Lanasyn Red F-3GL
EINECS	Contact for details

Quality Control

Our Acid Red 251 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against rigorous internal specifications for color strength, purity, and solubility. A comprehensive Certificate of Analysis (COA) detailing assay, shade, and impurity profiles is provided with every shipment to support your quality assurance protocols.

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). This product is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture, which may affect performance.

Specification

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

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