PTA (Purified Terephthalic Acid)


C00H - C6H4 - C00H


A white crystalline powder with a slight acidic odor. It is mildly irritating to the eyes, skin and respiratory tract.


Molecular weightg/mol166.13
Melting point°Csublimes at 402°C
Vapor densityat 20°C (air = 1.0)5.74
Vapor pressureat 20°C< 0.00013
pH1% dilution2.16
CAS number100-21-0
IUPAC nameTerephthalic acid


ParameterUnitQuantityTest Method
Aciditymg of KOH/gm675 ± 2MA-863
Moisturewt %0.2 max.MA-1015
Ashppm7 max.MA-696
4-Carboxybenzaldehydeppm25 max.MA-1262
ColorAPHA (in N-N-Dimethyl From Amide Solution), HU10 max.MA-998
Ironppm0.5 max.MA-1256
Para Toluic Acidppm150 max.MA-667
Total metals Fe, Mn, Co, Cr, Ni, Mo, Tippm2 max.MA-1302
Δ Y10 max.MA-60

Hazards and safety

The material is moderately discomforting to the gastrointestinal tract and may be harmful if swallowed in large quantity.

Flash point°C260
Ignition point°C496


PTA is mainly used in the production of polyester products, including polyethylene terphthalate (PET), follows reaction with glycol, reagent for alkali in wool and an additive to poultry feeds.

Storage and handling

Multi ply paper bag with sealed plastic liner or heavy gauge plastic bag. Check that all containers are clearly labeled and free from leaks.

- Big-bags of 1000kg (20MT per 20ft container).
- Big-bags of 1100kg (22MT per 20ft container).
- Bulk container (up to 25MT per 20ft container).