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Basic Red 51 (CAS 77061-58-6) is a synthetic cationic monoazo dye, renowned for its vibrant red color, excellent fiber affinity, and outstanding colorfastness. It is primarily used for dyeing acrylic fibers, delivering bright, intense red shades with good fastness. It is also applied in textiles (yarns, fabrics, and carpets), leather finishing, paper dyeing, and biological staining.
Soluble in water and ethanol with stable performance across applications, Basic Red 51 is a trusted choice for achieving intense, long-lasting coloration in industrial and personal care products. Proper handling is required due to its toxicity and regulatory restrictions.
| Items | Specifications | Results |
| Appearance | Red uniform powder or granules | Conforms |
| Strength of dyes | 200% | Conforms |
| Tone of dyes | Approximate | Conforms |
| Moisture of dyes | 3.6% | Conforms |
| Fineness of dyes | 10% （250um brush tailings） | Conforms |
| Insoluble in water | 0.1% | Conforms |
| Property | Details |
| Cas number | 77061-58-6 |
| Chemical Class | Monoazo dye (containing a -N=N- azo group) |
| Chemical Structure | Features a benzothiazole moiety linked to an azo group and a substituted phenyl ring |
| Mechanism | Positively charged dye molecules form ionic bonds with negatively charged sites on acrylic fibers |
| Purity | Strength of dyes:200% |
| Solubility | Soluble in water and ethanol, yielding a red to bluish-red solution |
| Application | Used for dyeing acrylic textiles, paper,leather finishing, and staining biological specimens. |
| Package details | 25kg/drum |
| Brand | Fortunachem |
Vibrant and long-lasting red coloration
Excellent fiber affinity for acrylic, nylon, and modified polyester fibers
Good lightfastness and washfastness
Soluble in water and ethanol, easy to handle in industrial processes
Classified as toxic and an irritant
Harmful if swallowed
Mutagenic and listed on the EU SVHC candidate list due to potential reproductive toxicity (Regulation (EC) No 1907/2006 – REACH)
Requires proper protective measures: gloves, goggles, and lab coats during handling
Store in a cool, dry place, away from direct sunlight and incompatible chemicals
Basic Red 51 is a bright red cationic azo dye essential for achieving intense, uniform coloration on acrylic fibers. Its high colorfastness and versatility make it ideal for textiles, leather, paper, and biological applications. Buyers should note safety precautions and regulatory restrictions to ensure safe use in industrial and personal care production.
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