Used as a strong acid cation exchange resin in organic synthesis, particularly for catalyzing reactions such as esterification, hydrolysis, and dehydration due to its high acidity and stability. Commonly employed in the purification of sugars, amino acids, and antibiotics by removing cationic impurities. Also utilized in water treatment to soften water by removing calcium and magnesium ions. Its fine mesh size (100-200) makes it suitable for column chromatography where high resolution and efficient ion exchange are required. The hydrogen form allows direct use in acid-catalyzed reactions without prior activation.