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 可當 酸-觸媒反應如聚合、.酯化、.水解、脫水、轉酯化、烷基化等的催化劑。反應溫和，選擇性高，色澤佳。

2.油漆業可當.樹脂之硬化劑，例如：氨樹脂、環氧基樹脂和酚樹脂；木造傢俱漆之硬化劑。

3.染料工業，接著劑和特殊可塑劑中間體。

4.酯化反應中脫水作用之催化劑。

5.電鍍槽中之抗壓添加劑。

6.鑄造工業 酚醛樹脂、夫喃樹脂之硬化劑

7.其它如當酚烷基化觸媒。