Product sheet
Phthalic anhydride - Medium-temperature process

Corrosive in the presence of water, forming phthalic acid.

Solid at 20 ˚C (white flakes).

Faint, pungent odor.

Formula: C₈H₄O₃.

Molecular mass: 148.11 g/mol.

Melting temperature: 131 ˚C.

Boiling temperature: 284.5 ˚C.

Solid vapor pressure at 20 ˚C: 0.001 mbar.

Liquid vapour pressure at 150 ˚C: 23.6 mbar.

Solid density at 20 ˚C: 1.53 g/cm³.

Liquid density at 170 ˚C: 1.175 g/cm³.

Solubility in water :

• at 20 ˚C: hydrolysis to acid ;

• at 100 ˚C: 19 g per 100 g water.

Soluble in acetone, benzene, xylene, ethanol. Slow hydration in humid atmosphere.