Direct Red 28 (Congo Red) | CAS 573-58-0 Manufacturer & Supplier in China

Product Overview

Direct Red 28 (CAS 573-58-0), commonly known as Congo Red, is a secondary diazo dye. As a leading China manufacturer and supplier in the Dyes and Indicators sector, Conscientia Industrial provides high-quality Direct Red 28 with excellent affinity for cellulose fibers. Beyond its traditional role in the textile industry, it is widely utilized as a pH indicator (turning from blue to red between pH 3.0 and 5.2) and as a vital diagnostic stain in histology and laboratory R&D for detecting amyloidosis.

Technical Specifications

• Product Name: Direct Red 28

• Synonyms: Congo Red

• CAS Number: 573-58-0

• Quality Standard: In-House / Industrial Grade

• Purity (Dye Content): ≥80% (or as per customer requirement)

• Molecular Formula: C32H22N6Na2O6S2

• Molecular Weight: 696.66

• Appearance: Reddish-brown powder

• Solubility: Soluble in water and ethanol

• pH Range: 3.0 (Blue) - 5.2 (Red)

• Country of Origin: China

• Pricing: Competitive price based on quantity

• Currency: USD

• Chemical Structure:

Why Partner with Conscientia Industrial

• Dye Synthesis Expertise: Specialized in the production of high-affinity diazo dyes for industrial and laboratory applications.

• Advanced Quality Control: Every batch is tested for color intensity, solubility, and pH transition accuracy to ensure consistent performance.

• Documentation and Compliance: We provide comprehensive technical dossiers, including Certificate of Analysis (COA), MSDS, and safety data sheets.

• Reliable Industrial Supply: Robust production capacity in China to support bulk textile manufacturing and specialized laboratory needs.

• As a leading China manufacturer, we provide Direct Red 28 CAS 573-58-0 with factory-direct pricing.

Packaging & Storage

• Standard Packaging: 25kg drum, 25kg bag, or small glass bottles for laboratory use.

• Storage Conditions: Store in a cool, dry, and well-ventilated area. Keep the container tightly sealed and away from strong oxidizing agents.

• Safety Handling: Handle with care as it is a diazo compound; intended for professional industrial and laboratory use only.

• Our logistics team ensures safe delivery of Direct Red 28 CAS 573-58-0 by courier / air / sea.

Request a Quote & COA for Direct Red 28 CAS 573-58-0 Today.