Terephthalic acid
CAS 100-21-0C8H6O4166.13 g/mol
Terephthalic acid is a benzenedicarboxylic acid carrying carboxy groups at positions 1 and 4. One of three possible isomers of benzenedicarboxylic acid, the others being phthalic and isophthalic acids. It is a conjugate acid of a terephthalate(1-).
IUPAC: terephthalic acid
PubChem
Physical & Chemical Properties
| Melting Point | Sublimes (NTP, 1992) |
| Boiling Point | greater than 572 °F at 760 mmHg (sublimes without melting) (NTP, 1992) |
| Density | 1.51 (NTP, 1992) - Denser than water; will sink |
| Solubility | Insoluble (NTP, 1992) |
| Flash Point | 260 °C |
| Vapor Pressure | 0.0000092 [mmHg] |
| Appearance | Terephthalic acid is a white powder. (NTP, 1992) |
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
No trade flow data available for this chemical.
HS Code(s): 2917
Data: UN Comtrade
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