Description

Acid Red 186 is a synthetic, water-soluble azo dye belonging to the acid dye class, valued for its bright red color and good fastness properties. Its primary commercial value lies in its excellent affinity for protein fibers like wool, silk, and nylon, as well as its utility in coloring various industrial materials. This dye is essential for manufacturers in the textile, leather, and paper industries seeking vibrant and durable red shades. Acid Red 186 CAS NO 52677-44-8 is also utilized in specialized applications such as inks and biological staining.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, nylon, and modified acrylic fibers to achieve bright red hues with good wash and light fastness.
• Leather Coloring: Used in the dyeing of leather goods, providing rich, penetrating color for products like upholstery, footwear, and accessories.
• Paper Staining: Employed in the production of colored papers, specialty packaging, and decorative paper products.
• Ink Formulation: A colorant for inks used in ballpoint pens, stamp pads, and other writing or marking fluids.
• Biological Stains: Finds use in laboratory settings as a histological stain for microscopic analysis of tissue samples.
• Polymer Coloring: Can be incorporated into certain plastics and resins during manufacturing to impart color.

Basic Information

Product Name	Acid Red 186
CAS No.	52677-44-8
Molecular Formula	C26H21N5Na2O8S2
Molecular Weight	649.57 g/mol
Synonyms	Acid Brilliant Red 3B; C.I. Acid Red 186; Lissamine Red 3B; Nylosan Red E-BL; Acid Leather Red 3B; 1,3-Naphthalenedisulfonic acid, 7-[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-1-hydroxy-, disodium salt; Amido Naphthol Red 3B
EINECS	258-111-4

Quality Control

Our Acid Red 186 is produced under a strict quality management system to ensure batch-to-batch consistency and performance. Each lot undergoes comprehensive testing, including spectrophotometric analysis for color strength and purity, assessment of insolubles, and verification of key physical properties. A Certificate of Analysis (COA) detailing these results is provided with every shipment to guarantee compliance with your technical requirements.

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); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insolubles	≤ 0.5%
pH (1% Solution)	6.0 - 8.0
Shade	Conforms to standard

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