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
Why Choose 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.
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