Phthalic Anhydride
Phthalic Acid
- CAS
- 85-44-9
- EC
- 201-607-5
- Sectors
- Plastics & Polymers, Coatings, Adhesives, Sealants & Elastomers
Phthalic Anhydride (CAS 85-44-9), the cyclic anhydride of phthalic acid, is a white flaky crystalline solid supplied as a key intermediate for plasticizers, alkyd resins, dyes and pigments, and is also used in pharmaceuticals and flame retardants.
Typical Properties
| Molecular formula | C8H4O3 |
|---|---|
| Molecular weight | 148.12 g/mol |
| Form | Flaky Crystals |
| Color | White |
| Odor | Characteristic choking odor |
| Melting point | 130.8 °C |
| Boiling point | 295 °C |
| Density | 1.53 g/cm³ |
| Water solubility | 6 g/L (20 °C) |
| Flash point | 152 °C |
| pH | 2 (6g/l, H2O, 20°C) |
| GHS signal word | Danger · Corrosive, Irritant / harmful, Health hazard |
| HS code | 29173500 |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Phthalic Anhydride
Applications
Used in alkyd resins, PVC plasticizers (DOP, DBP), dyes, and pigments. Also applied in pharmaceuticals and flame retardants.
Safety & Risks
Irritating to eyes and respiratory tract; may cause sensitization. Avoid heating and dust accumulation.
Packaging
Supplied in 25 kg bags or molten in tank trucks. Store cool, dry, and sealed from moisture.