1.PTSA is used for acid-catalyst reaction such as estification、hydrolysis、dehydration、polymerizationand 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.

1.PTSA 可当 酸-触媒反应如聚合、.酯化、.水解、脱水、转酯化、烷基化等的催化剂。反应温和，选择性高，色泽佳。

2.油漆业可当.树脂之硬化剂，例如：氨树脂、环氧基树脂和酚树脂；木造家俱漆之硬化剂。

3.染料工业，接着剂和特殊可塑剂中间体。

4.酯化反应中脱水作用之催化剂。

5.电镀槽中之抗压添加剂。

6.铸造工业 酚醛树脂、夫喃树脂之硬化剂

7.其它如当酚烷基化触媒。