Molekula
Fluorescein disodium salt (soluble, 40-50% dye content)
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Fluorescein disodium salt is a bright yellow-orange fluorescent dye widely used in biological staining, flow cytometry, tracer studies, and ophthalmology for diagnostic imaging. It dissolves easily in water and emits green fluorescence under UV or blue light, making it ideal for marking fluids, detecting leaks, and research applications. This product has a CAS number of 518-47-8, a molecular formula of C20H10Na2O5, and a molecular weight of 376.28 g/mol. It contains 40–50% dye content, requires no special storage conditions (ambient), and carries no hazard classification. Molekula supplies Fluorescein disodium salt from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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 | Orange to Brown Powder |
| Solubility | Soluble in Water |
| Moisture | 00.000 - 10.000 %(m) |
| Wavelength of Max. Absorption | 488.000 - 491.000 nm |
| Specific absorption (E 1% in 10 mm cell) at λ max. | 840.000 - 1000.000 |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Flash Point | 218 °C |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 90025175 |
| CAS Number | 518-47-8 |
| IUPAC Name | disodium;2-(3-oxido-6-oxoxanthen-9-yl)benzoate |
| EC Number | 208-253-0 |
| Molecular Formula | C20H10Na2O5 |
| Molecular Weight | 376.28 |
| Exact Mass | 376.0324 |
| SMILES | C1=CC=C(C(=C1)C2=C3C=CC(=O)C=C3OC4=C2C=CC(=C4)[O-])C(=O)[O-].[Na+].[Na+] |
| InChIKey | NJDNXYGOVLYJHP-UHFFFAOYSA-L |
| InChI | InChI=1S/C20H12O5.2Na/c21-11-5-7-15-17(9-11)25-18-10-12(22)6-8-16(18)19(15)13-3-1-2-4-14(13)20(23)24;;/h1-10,21H,(H,23,24);;/q;2*+1/p-2 |
| PubChem CID | 10608 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 32129000 |
| Tariff Code | 3212900000 |
Safety & GHS
Precautionary statements
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P308+313 IF exposed or concerned: Get medical advice/attention
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.
Synonyms
- Ak-Fluor
- Fluorescein disodium salt
- Fluorescein, soluble
- Ki202
- Resorcinol phthalein sodium
- Sodium fluorescein
- Soluble fluorescein
- Uranin
- Uranine WSS
- Uranine Yellow
Frequently asked questions
What is fluorescein disodium salt commonly used for?
It is primarily used as a fluorescent dye in biological staining, ophthalmology (e.g., fluorescein angiography), and as a tracer in environmental and industrial applications.
What is the chemical formula and molecular weight of fluorescein disodium salt?
The formula is **C₂₀H₁₀Na₂O₅**, and the molecular weight is **376.28 g/mol** (for the 100% dye content form).
How should fluorescein disodium salt be stored?
Store at **ambient temperature** in a tightly sealed container, protected from light and moisture to maintain stability.
What grades or purities of fluorescein disodium salt does Molekula supply?
Molekula supplies it with a **40–50% dye content** (soluble grade), suitable for most industrial and research applications.
Can Molekula supply fluorescein disodium salt in bulk quantities?
Yes, we offer bulk packaging options—please contact our sales team for custom quantities and pricing.
What documentation comes with an order of fluorescein disodium salt?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and a product specification sheet.
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.