Molekula
Fast red TR salt hemi(zinc chloride) 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 TR salt hemi(zinc chloride) salt is a stabilized diazonium salt (4-chloro-2-methylbenzenediazonium, Azoic Diazo Component 11) primarily used in microscopy and histology as a chromogen for enzyme histochemistry and immunohistochemistry, particularly in fluorescence imaging and light microscopy. It couples with naphthol released by enzymes such as alkaline phosphatase or esterase, forming an insoluble red azo dye at the site of enzyme activity that enhances contrast and visibility under the light microscope. This product has a CAS number of 89453-69-0, a molecular formula of C14H12Cl6N4Zn, and a molecular weight of 514.4 g/mol. It must be stored at ambient conditions and carries a signal word of Danger due to its hazardous properties.
Molekula supplies Fast red TR salt hemi(zinc chloride) salt at >90% purity in 1 g packs, from £181.44 inc. VAT. It is made or sourced to order. 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
On backorder — expected to ship by 5 December 2026
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 — £151.20 per pack ex VAT · £181.44 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 | White/ beige powder |
| Identification | Conforms to reference |
| Assay | >90% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 |
| Packing Group | III |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 90026927 |
| CAS Number | 89453-69-0 |
| IUPAC Name | bis(4-chloro-2-methylbenzenediazonium);dichlorozinc;dichloride |
| Molecular Formula | C14H12Cl6N4Zn |
| Molecular Weight | 514.4 |
| Exact Mass | 511.8455 |
| SMILES | CC1=C(C=CC(=C1)Cl)[N+]#N.CC1=C(C=CC(=C1)Cl)[N+]#N.[Cl-].[Cl-].Cl[Zn]Cl |
| InChIKey | RIIVFDKBXXMYRL-UHFFFAOYSA-J |
| InChI | InChI=1S/2C7H6ClN2.4ClH.Zn/c2*1-5-4-6(8)2-3-7(5)10-9;;;;;/h2*2-4H,1H3;4*1H;/q2*+1;;;;;+2/p-4 |
| PubChem CID | 16212368 |
| UN Number | UN3621 |
| REACH Code | Y110 |
| HTS Code | 32129000 |
| Tariff Code | 3212900000 |
Safety & GHS
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Corrosive
GHS05
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Health Hazard
GHS07
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Hazardous to the Environment
GHS09
Hazard statements
- H302 Harmful if swallowed
- H314 Causes severe skin burns and eye damage
- H318 Causes serious eye damage
- H410 Very toxic to aquatic life with long lasting effects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P305+351+338 IF IN EYES: Rinse 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
- 4-chloro-2-methylbenzenediazonium;dichlorozinc;dichloride
- Fast red TR salt hemi(zinc chloride)
Frequently asked questions
What is Fast Red TR salt hemi(zinc chloride) used for?
Fast Red TR salt hemi(zinc chloride) is primarily used as a diazonium coupling chromogen in enzyme histochemistry and immunohistochemistry. It is not a dye in itself: it couples with naphthol compounds, such as those released by alkaline phosphatase or esterase activity, to form an insoluble red azo dye at the site of enzyme activity.
What is the molecular formula and molecular weight of Fast Red TR salt hemi(zinc chloride)?
The molecular formula is C₁₄H₁₂Cl₆N₄Zn, and the molecular weight is 514.4 g/mol.
What safety classification does Fast Red TR salt hemi(zinc chloride) have?
The product is classified with the signal word 'Danger' due to its hazardous properties.
How should Fast Red TR salt hemi(zinc chloride) be stored?
Store at ambient temperature in a cool, dry place, away from incompatible substances and moisture.
Does Molekula offer Fast Red TR salt hemi(zinc chloride) in bulk quantities?
Yes, Molekula can supply Fast Red TR salt hemi(zinc chloride) in bulk, with quantities tailored to your specific requirements.
What documentation comes with an order of Fast Red TR salt hemi(zinc chloride)?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and a product specification sheet.
Where can I buy Fast red TR salt hemi(zinc chloride) salt?
Directly from Molekula, which lists Fast red TR salt hemi(zinc chloride) salt in 1 g packs from £181.44 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.
Is Fast red TR salt hemi(zinc chloride) salt dangerous goods for shipping?
Yes. Fast red TR salt hemi(zinc chloride) salt ships as dangerous goods: UN3621, class 8, packing group III.
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.