Reactive Black 5
Reactive Black 5 (CAS: 17095-24-8), with the molecular formula C26H21N5Na4O19S6 and a molecular weight of 991.82, is a reactive dye commonly known as Remazol Black B. This dyestuff is primarily employed in the textile industry for dyeing cotton and other cellulosic fibres. Its chemical structure allows for covalent bonding with the fibre, resulting in excellent wash fastness and vibrant black coloration. It is also recognised for its utility in certain biological staining applications.
- IUPAC
- Remazol Black B
- Synonyms
- Remazol Black B
Textile Dyeing
Reactive Black 5 is extensively used for dyeing cellulosic fibres such as cotton, rayon, and linen. It provides a deep black shade with good fastness properties due to its reactive nature, forming a covalent bond with the hydroxyl groups of cellulose.
Biological Staining
In laboratory settings, this dye finds application in cell biology, hematology, and histology as a staining agent. It is particularly useful for differentially staining cellular components and tissues, aiding in microscopic examination.
Research and Development
Its specific chromophoric and reactive properties make Reactive Black 5 a subject of interest in chemical research, particularly in areas involving dye chemistry and material science.
| Molecular weight | 991.82 |
|---|---|
| Empirical formula | C26H21N5Na4O19S6 |
| Melting point | >300 °C(lit.) |
Hazard statements
- H317May cause an allergic skin reaction
- H334May cause allergy or asthma symptoms if inhaled
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P280Wear protective gloves, clothing and eye/face protection
- P342
| Protective equipment | dust mask type N95 (US), Eyeshields, Faceshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 42/43 |
| Safety statements (S) | 22-36/37 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Absorption | λmax 597 nm |
|---|
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Reactive Black 5 used for?
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Reactive Black 5 is primarily used for dyeing cellulosic fibres like cotton and is also employed as a stain in cell biology, hematology, and histology.
What are the CAS number and formula for Reactive Black 5?
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The CAS number for Reactive Black 5 is 17095-24-8, and its molecular formula is C26H21N5Na4O19S6.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Reactive Black 5 as a technical or research-grade product. We do not represent this product as meeting USP, BP, or EP pharmacopoeial standards, and the specific assay is detailed on the Certificate of Analysis.
How should Reactive Black 5 be handled safely?
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Reactive Black 5 is classified as a sensitiser (H317, H334). Handle with appropriate personal protective equipment, including a dust mask (type N95 US recommended), eyeshields, face shields, and gloves. Avoid breathing dust and ensure adequate ventilation. In case of respiratory symptoms, seek medical attention (P342 + P311).
Is Reactive Black 5 a controlled substance?
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The provided data does not indicate that Reactive Black 5 is a controlled substance.
How is Reactive Black 5 shipped and exported by TSS?
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Tech Serve Solutions is a global supplier and exporter of fine chemicals, including Reactive Black 5. We adhere to all relevant shipping and export regulations for chemical products.
How can I request a quote or sample of Reactive Black 5?
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To request a quote or sample of Reactive Black 5, please contact our sales team through the channels provided on the Tech Serve Solutions website.
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