P-Toluenesulfonic Acid
pTSA, Tosyl Acid
- CAS
- 104-15-4
- EC
- 203-180-0
- Sectors
- Coatings, Adhesives, Sealants & Elastomers, Plastics & Polymers
P-Toluenesulfonic Acid (CAS 104-15-4) is a strong organic acid supplied as a clear colorless to light yellow solution; it acts as an acid catalyst in esterification, polymerization and alkylation reactions and is used in resins and pharmaceuticals.
Typical Properties
| Molecular formula | C7H8O3S |
|---|---|
| Molecular weight | 172.2 g/mol |
| Appearance | Clear colorless to light yellow solution |
| Form | Solution |
| Color | Clear colorless to light yellow |
| Odor | pungent odor |
| Melting point | 106-107 °C |
| Boiling point | 140 °C @ Press: 20 Torr |
| Density | 1.24 g/cm³ |
| Water solubility | soluble |
| Flash point | 41 °C |
| GHS signal word | Warning · Corrosive, Irritant / harmful, Health hazard |
| HS code | 29163900 |
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.
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P-Toluenesulfonic Acid
Applications
Used as a catalyst in esterification, polymerization, and alkylation reactions. Also employed in pharmaceuticals and resins as an acid catalyst or dopant.
Safety & Risks
Corrosive and irritant; handle with gloves and avoid inhalation.
Packaging
Delivered in 25 kg bags or 200 kg drums. Store dry, cool, and tightly sealed.