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1. Organic Synthesis Reagent: Quaternary ammonium hydroxide is an organic base that can react with various acids to produce corresponding ammonium salts, such as tetramethyl ammonium fluoride, tetraethyl ammonium fluoride, tetrabutyl ammonium nitrate and other difficult to synthesize ammonium salts.

2. Surfactants: Long chain quaternary ammonium hydroxide can be used as surfactants.

3. Catalyst: As a catalyst for the synthesis of organic silicon, such as for the synthesis catalyst of methyl silicone oil, amino silicone oil, benzyl silicone oil, polymethyl silsesquioxane, organic silicon foam. Condensation catalyst for rubber antioxidant intermediates, tetramethyl ammonium hydroxide (TMAH) is especially used for this field. 

4. Template: Used as a template for the synthesis of zeolites and molecular sieves.

5. Analysis Field: When determining the composition of fatty acids using gas chromatography, quaternary ammonium hydroxide is used as a pre-treatment agent; Used as a supporting electrolyte in polarographic analysis; Quaternary ammonium hydroxide is a strong organic base that can be used as a titrant for organic acids, especially when avoiding metal ions and using non-aqueous solvents. 

6. Product Purification: Used as a ashless alkali to precipitate many metal elements. 

7. Developing Solution: High purity products of quaternary ammonium hydroxide, as important cationic photoresist imaging agents, are essential for manufacturing ultra large scale integrated circuits. After imaging, there are no trace amounts of conductive impurities left. 

8. Etching Agent: It has the advantages of high etching rate, good crystal orientation selectivity, and low toxicity. Currently, it is gradually replacing KOH and other etchants as the main etchant for micro three-dimensional structures in microelectromechanical system processes, and also serves as an etchant for printed circuit boards. 

9. Cleaning agent: Quaternary ammonium hydroxide can also be used as a cleaning agent in microelectronic chip manufacturing.