Phthalic anhydride
Also known as: 1,3-DIHYDRO-IMIDAZOL-2-ONE, 1,3-dihydro-2H-imidazol-2-one, 1,3-dihydro-2h-imidazol-2-on, 1,3-dihydroimidazolone, 1,3-dihydroisobenzofuran-1,3-dione, 1,3-isobenzofurandione, 1H-imidazol-2(3H)-one, 2(3H)-Oxo-1H-imidazole, 2,3-DIHYDRO-IMIDAZOL-2-ONE, 2,3-Dihydroimidazole-2-one, 2,3-dihydro-1H-imidazol-2-one, 2-hydroxyimidazole, 4-imidazolin-2-one, EINECS 201-607-5, MFCD00005918, isobenzofuran-1,3-dione, o-Phthalic acid anhydride, phthalic anhydride, phthallic anhydride, sd8591
Phthalic anhydride (CAS 85-44-9) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C8H4O3 and a molecular weight of 148.116 g/mol. Key properties include a melting point of 129-132 ºC, a boiling point of 284 ºC, a density of 1.4±0.1 g/cm3 and a flash point of 152 ºC. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H317 — May cause an allergic skin reaction. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 85-44-9
- Jingsj CID
- J-28541-0
- Molecular Formula
- C8H4O3
- Molecular Weight
- 148.116 g/mol
- Category
- Aromatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 129-132 ºC |
|---|---|
| Boiling Point | 284 ºC |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 152 ºC |
| Exact Mass | 148.016037 |
| PSA | 43.37000 |
| LogP | 1.60 |
| Additional Property | 5.1 (vs air) |
| Vapor Pressure | 0.0±0.6 mmHg at 25°C |
| Refractive Index | 1.613 |
| Additional Property | 6 g/L (20 ºC) |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H317 — May cause an allergic skin reaction
- H318 — Causes serious eye damage
- H334 — May cause allergy or asthma symptoms if inhaled
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2917350000 |
|---|---|
| Summary | HS:2917350000 isobenzofuran-1,3-dione VAT:17.0% Tax rebate rate:9.0% Supervision conditions:AB MFN tariff:6.5% General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Phthalic anhydride?
The CAS number of Phthalic anhydride is 85-44-9.
What are the molecular formula and molecular weight of Phthalic anhydride?
Phthalic anhydride has molecular formula C8H4O3 and molecular weight 148.116 g/mol.
Is Phthalic anhydride hazardous?
Phthalic anhydride has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H317 — May cause an allergic skin reaction.
What are the upstream and downstream products of Phthalic anhydride?
For Phthalic anhydride, Upstream Products: o-xylene, Phthalan, Phthalic acid; Downstream Products: 2-Ethylanthraquinone.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Phthalic anhydride (CAS 85-44-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-28541-0 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.