Phthalic anhydride
CAS 85-44-9C8H4O3148.11 g/mol
Phthalic anhydride is the cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. It has a role as an allergen. It is a cyclic dicarboxylic anhydride and a member of 2-benzofurans.
IUPAC: 2-benzofuran-1,3-dione
PubChem
Physical & Chemical Properties
| Melting Point | 267.4 °F (NTP, 1992) |
| Boiling Point | 563 °F at 760 mmHg (sublimes) (NTP, 1992) |
| Density | 1.2 at 275 °F 1.53 at 20 °C (solid) (USCG, 1999) - Denser than water; will sink |
| Solubility | Decomposes (NTP, 1992) |
| Flash Point | 305 °F (NTP, 1992) |
| Vapor Pressure | 0.0002 mmHg at 68 °F ; 0.001 mmHg at 86 °F (NTP, 1992) |
| Appearance | Phthalic anhydride appears as a colorless to white lustrous solid in the form of needles with a mild distinctive odor. Moderately toxic by inhalation or ingestion and a skin irritant. Melting point 64 °F Flash point 305 °F. Forms a corrosive solution when mixed with water. Used in the manufacture of materials such as artificial resins. |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
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HS Code(s): 2917
Data: UN Comtrade
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