Widely used as an acid catalyst in organic synthesis, particularly in esterification, etherification, and dehydration reactions due to its strong acidity and good solubility in organic solvents. Commonly employed in the production of resins, dyes, and pharmaceuticals. Also used in the preparation of protecting groups in carbohydrate and peptide chemistry. Its solid form makes it easier to handle compared to liquid mineral acids, improving safety and dosing accuracy in industrial processes. Frequently utilized in polymer chemistry as a curing agent or cross-linking promoter in coatings and adhesives.