Benzenesulfonic acid
CAS 98-11-3
EC 202-638-7
Formula C6H6O3S
MW 158.18 g/mol
Catalysts & Catalyst Precursors Textile, Leather & PaperCoatings, Adhesives, Sealants & ElastomersPrinting & Packaging pH Regulation & BufferingUV Protection & StabilizationCatalysisEmulsification & DispersionPreservation & Biocide
Description
Benzenesulfonic acid (CAS 98-11-3, EC 202-638-7, formula C6H6O3S) is a strong aromatic sulfonic acid also known by trade designations BW 70, 17-120A, and besylic acid. It carries no assigned E-code and is classified under HS code 29041000 within the organic acids category.
In textile and leather processing, benzenesulfonic acid acts as an acid catalyst to accelerate dye fixation and as a pH buffer to maintain bath conditions within precise ranges. In coatings and adhesive formulations, it functions as a surfactant precursor and UV stabilizer, improving emulsion stability and protecting polymer matrices from photodegradation.
This material is supplied as a damp crystalline solid or fused mass and falls under REACH registration requirements for EU market supply. Procurement teams should confirm grade specification, purity documentation, and SDS compliance prior to ordering, as available grades may vary by supplier and intended application sector.
In textile and leather processing, benzenesulfonic acid acts as an acid catalyst to accelerate dye fixation and as a pH buffer to maintain bath conditions within precise ranges. In coatings and adhesive formulations, it functions as a surfactant precursor and UV stabilizer, improving emulsion stability and protecting polymer matrices from photodegradation.
This material is supplied as a damp crystalline solid or fused mass and falls under REACH registration requirements for EU market supply. Procurement teams should confirm grade specification, purity documentation, and SDS compliance prior to ordering, as available grades may vary by supplier and intended application sector.
Physical Properties
| Melting Point | 65 °C |
| Boiling Point | 137°C |
| Density | 1.32 |
| Flash Point | >230 °F |
| Appearance | green solid |
| Color | Yellow to light brown |
| Form | Damp Crystalline Solid or Fused Mass |
| Water Solubility | soluble |
| Vapor Pressure | 69.8Pa at 20℃ |
| Refractive Index | 1.5151 (estimate) |
| pH | 2 (H2O, 20℃)(saturated solution) |
| Log P | 0.41 at 25℃ |
Safety & Handling (Learn More)
Danger GHS05 GHS07
H
H290H302H314H318
P
P234P260P264P270P280P316P317P321P330P363P390P405P406P501P264+P265P301+P317P304+P340P301+P330+P331P302+P361+P354P305+P354+P338
Trade & Regulatory
| HS Code | 29041000 |
| UN Number | 2583 |
| ADR Class | 8 |
| Packing Group | II |
| Storage Class | 8A - Combustible corrosive hazardous materials |
| WGK (Germany) | 1 |
Other Names
Benzenesulphonic acidBSABW 7017-120abesylicacidBesylic acidBenzensulfonic acid
Related Products
Raw Materials
Derivatives
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