Sodium acid pyrophosphate (SAPP) has various industrial applications beyond its use as a food additive. Some of the industrial applications of sodium acid pyrophosphate include:

1. Water Treatment: SAPP is used in water treatment processes as a corrosion inhibitor and to prevent the formation of scale in water pipes and equipment.

2. Metal Cleaning: SAPP is used in metal cleaning formulations to remove rust, scale, and other contaminants from metal surfaces.

3. Electroplating: SAPP is used in electroplating processes to help improve the adhesion of metal coatings to substrates.

4. Textile Industry: SAPP is used in the textile industry as a dyeing assistant and as a catalyst in some textile processes.

5. Oil Industry: SAPP is used in the oil industry for drilling mud formulations to control viscosity and reduce fluid loss.

6. Pharmaceutical Industry: SAPP is used in certain pharmaceutical formulations as a buffering agent and to control the pH of medications.

7. Construction Industry: SAPP is used in the construction industry in cement and concrete formulations to improve workability and set time.

8. Paper Industry: SAPP is used in the paper industry as a dispersant for pigments and fillers in paper coatings and as a buffering agent in papermaking processes.

These are just a few examples of the industrial applications of sodium acid pyrophosphate. The compound’s properties make it versatile and useful in various industrial processes.