Metallurgy Industry

1. It is used to produce hydrogen halide by reacting it with halide.
2. Phosphoric acid used as electrolyte in phosphoric acid fuel cells, oxy-hydrogen generators and Copper electro polishing.
3. It is used as a wet etching agent for making impressions on surface.
4. Most of the industries using iron and steel use phosphoric acid as a rust converter

Fertilizer Industry

1. It is used as intermediate for manufacturing many phosphatic fertilizers.

Food Industry

1. One of its applications is to acidify beverages and foods as an additive because of its low cost and mass production.
2. It provides tangy or sour taste to the processed food like various colas.