Concord-Top Corp is a leading manufacturer of chemical raw material manufacturer of PTSA (P-Toluene Sulfonic Acid) 95％ in Taiwan for over 30 years. Our products are founded on excellent quality, competitive prices, short lead time, satisfactory services and constantly development. Moreover, we are ready for providing a good service and flexible response to meet our valuable customer requirements. PTSA ( Para-Toluene Sulfonic Acid ): 1. Used for acid-catalyst reaction such as estification, hydrolysis, dehydration, polymerization and alkylation as a catalyst. 2. As hardener of many resin systems, such as resoles, epoxies, amino-Plastics and furniture lacquers. 3. As intermediate of dye chemistry, adhesives and specialized plasticizers. 4. As a hardening agent of furan resin which is applied in foundry Industry (Sand Casting). 5. As an anti-stress additive for electroplating baths.