Fluorescein
Also known as: 2-(6-Hydroxy-3-oxo-3H-xanthen-9-yl)benzoic acid, Solvent Yellow 94, C.I. 45350:1, D&C Yellow No. 7, Resorcinolphthalein, 3',6'-Dihydroxyspiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one, Acid Yellow 73 (free acid)
Fluorescein (CAS 2321-07-5) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C20H12O5 and a molecular weight of 332.306 g/mol. Key properties include a melting point of 320 °C(lit.), a boiling point of 620.8±55.0 °C at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 232.6±25.0 °C. It is classified under GHS with signal word Warning and hazard statements H319 — Causes serious eye irritation. It is listed by 1 supplier; request a quote for pricing. Record last updated Aug 21, 2026.
- CAS No.
- 2321-07-5
- Jingsj CID
- J-47964-1
- Molecular Formula
- C20H12O5
- Molecular Weight
- 332.306 g/mol
- Category
- Organic Compounds
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
Made to Order | - | - | CN China |
Physicochemical Properties
| Melting Point | 320 °C(lit.) |
|---|---|
| Boiling Point | 620.8±55.0 °C at 760 mmHg |
| Density | 1.6±0.1 g/cm3 |
| Flash Point | 232.6±25.0 °C |
| Exact Mass | 332.068481 |
| PSA | 87.74000 |
| LogP | 2.98 |
| Vapor Pressure | 0.0±1.9 mmHg at 25°C |
| Refractive Index | 1.792 |
| Additional Property | insoluble |
GHS Safety & Compliance
- H319 — Causes serious eye irritation
Activity & Biological Data
| Additional Information | [1]. R Sjöback, et al. Absorption and fluorescence properties of fluorescein. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy |
|---|
Customs & Trade Information
| HS Code | 2932999099 |
|---|---|
| Summary | 2932999099. other heterocyclic compounds with oxygen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of Fluorescein?
The CAS number of Fluorescein is 2321-07-5.
What are the molecular formula and molecular weight of Fluorescein?
Fluorescein has molecular formula C20H12O5 and molecular weight 332.306 g/mol.
Which suppliers offer Fluorescein?
1 supplier(s) listed; request a quote for pricing.
Is Fluorescein hazardous?
Fluorescein has GHS signal word Warning and hazard statements H319 — Causes serious eye irritation.
What are the upstream and downstream products of Fluorescein?
For Fluorescein, Upstream Products: Fluorescein Diacetate, Phthalic anhydride, Resorcinol; Downstream Products: Fluorescein isothiocyanate isomer I, 3',6'-Dimethoxyfluoran, 4',5'-Dinitrofluorescein.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Fluorescein (CAS 2321-07-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-47964-1 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.