Molekula
Fast Red B Salt
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Fast Red B Salt is a diazo dye used in textile and paper dyeing, offering vibrant red coloration. It is a stabilized diazonium salt (2-methoxy-4-nitrobenzenediazonium naphthalene-1,5-disulfonate, Azoic Diazo Component 5) that couples with naphthol components in azoic dyeing and is also used in histochemical staining. CAS: 49735-71-9, Molecular Formula: C10H7O6S2·C7H6N3O3, Molecular Weight: 467.43 g/mol. Stored at ambient temperature. Signal word: Warning, with hazard statements H302, H315, H319, H335 and H351.
Molekula supplies Fast Red B Salt in 1 g and 10 g packs, from £534.00 inc. VAT. It is in stock for same-day dispatch. Every batch ships with a certificate of analysis, and safety data sheets are available in 6 languages. Larger quantities, up to multi-tonne, are quoted on request.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
In stock — same-day dispatch
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 g — £445.00 per pack ex VAT · £534.00 inc. VAT
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10 g — £2,620.00 per pack ex VAT · £3,144.00 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Yellow, tan or brown powder |
| Dye Content | ≥50% |
| Identification (IR) | Conforms to reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 32260403 |
| CAS Number | 49735-71-9 |
| Molecular Formula | C10H7O6S2·C7H6N3O3 |
| Molecular Weight | 467.43 |
| SMILES | COC1=C(C=CC(=C1)[N+](=O)[O-])[N+]#N.C1=CC2=C(C=CC=C2S(=O)(=O)[O-])C(=C1)S(=O)(=O)O |
| REACH Code | Y110 |
| HTS Code | 2927.00.3000 |
| Tariff Code | 2927000090 |
Safety & GHS
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Health Hazard
GHS07
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Serious Health Hazard
GHS08
Hazard statements
- H302 Harmful if swallowed
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
- H351 Suspected of causing cancer
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+P330+P331 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting
- P302+P352 IF ON SKIN: Wash with soap and water
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+P351+P338 IF IN EYES: Rinse continuously with water for several minutes. Remove contact lenses if present and easy to do, continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
No alternate names recorded for this product.
Frequently asked questions
What is Fast Red B Salt used for?
Fast Red B Salt is primarily used as a dye intermediate in the production of azo dyes for textiles and leather.
What is the chemical formula and molecular weight of Fast Red B Salt?
The formula is C10H7O6S2·C7H6N3O3 with a molecular weight of 467.43 g/mol.
How should Fast Red B Salt be stored?
It should be stored at ambient temperature, away from moisture and direct sunlight.
What specification does Molekula's Fast Red B Salt meet?
Molekula's Fast Red B Salt is a yellow, tan or brown powder with a dye content of at least 50%, and its IR identification conforms to the reference.
Can Molekula supply Fast Red B Salt in bulk?
Yes, Molekula can supply Fast Red B Salt in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with a Fast Red B Salt order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) upon request.
Where can I buy Fast Red B Salt?
Directly from Molekula, which lists Fast Red B Salt in 1 g and 10 g packs from £534.00 inc. VAT, with a certificate of analysis for every batch. Larger quantities are quoted on request. Molekula's offices: United Kingdom, France, Spain, Germany, Italy, United States and China.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.