C8H4O3
148.11 g/mol
Industrial ChemicalDanger
PHTHALIC ANHYDRIDE
CAS85-44-9EC201-607-5
Category
Industrial Chemical
Compound Class
Aromatic
Primary Use
Manufacture of artificial resins
Phthalic anhydride is a colorless to white lustrous solid with a mild distinctive odor, commonly used in the manufacture of artificial resins. It is toxic by inhalation or ingestion, irritates the skin, and forms a corrosive solution when mixed with water.
Manufacture of artificial resinsProduction of phthalates and benzoic acidSynthesis of synthetic indigo
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
ReferenceSame Category
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ReferenceSame Category
4'-(trans-4-Propylcyclohexyl)-3,4-difluorobiphenyl
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liquid crystal intermediate
Referencestereoisomer of
(²H₄)-2-Benzofuran-1,3-dione
CAS75935-32-9
research compound
Referencesame scaffold
4-Bromophthalic anhydride
CAS86-90-8
pharmaceutical intermediate
Referencesame scaffold
4-chlorophthalic anhydride
CAS118-45-6
Chemical intermediate for dyes and pigments
Referencesame scaffold
3-chlorophthalic anhydride
CAS117-21-5
pharmaceutical intermediate
Safety Reference
Danger
H302Harmful if swallowed
H315Causes skin irritation
H317May cause an allergic skin reaction
H318Causes serious eye damage
H334May cause allergy or asthma symptoms or breathing difficulties if inhaled
H335May cause respiratory irritation
H319Causes serious eye irritation
H336May cause drowsiness or dizziness
H372Causes damage to organs through prolonged or repeated exposure
H371May cause damage to organs
H361Suspected of damaging fertility or the unborn child
H402Harmful to aquatic life
Regulatory Compliance1
- CN Catalogue of Hazardous ChemicalsCNRegulation
Customs Tariff Classification
The international HS code for PHTHALIC ANHYDRIDE (CAS 85-44-9) is 2917.35.
HS code (international, 6-digit)
2917.35
EU CN code (8-digit)
2917 35 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
2-benzofuran-1,3-dione
InChIKey
LGRFSURHDFAFJT-UHFFFAOYSA-N
SMILES
C1=CC=C2C(=C1)C(=O)OC2=O
Synonyms (59)
- ESEN
- 1,3-Dioxophthalan
- 1,3-Isobenzofurandione
- 1,3-Phthalandione
- 2-Benzofuran-1,3-dione
- Anhydrid kyseliny ftalove
- Anhydride phtalique
- Anhydride phtalique [French]
- Anidride ftalica
- Anidride ftalica [Italian]
- Araldite HT 901
- Ftaalzuuranhydride
- Ftaalzuuranhydride [Dutch]
- Ftalanhydrid
- Ftalanhydrid [Czech]
- Ftalowy bezwodnik
- Ftalowy bezwodnik [Polish]
- Ht 901
- Isobenzofuran-1,3-dione
- PHTHALIC ANHYDRIDE
- Phthalandione
- Phthalanhydride
- Phthalic acid anhydride
- Phthalic anhydride (molten)
- Phthalsaeureanhydrid
- Phthalsaeureanhydrid [German]
- Retarder AK
- Retarder PD
- Retarder PX
- Retarder esen
- Sconoc 7
- Vulkalent B
- Vulkalent B/C
- Wiltrol P
- isobenzofurane-1,3-dione
- o-Phthalic acid anhydride
- o-phthalic anhydride
- ortho-phthalic acid anhydride
- phtalic anhydride
- pthalic anhydride
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