5-Mercapto-1-methyltetrazole (MMT) is primarily used as a corrosion inhibitor in various industrial applications. It is particularly effective in protecting metal surfaces, especially copper and its alloys, from corrosion in environments such as cooling water systems and boiler feedwater. MMT forms a protective layer on the metal surface, preventing the interaction of corrosive agents with the metal.

In the pharmaceutical industry, MMT is utilized as a key intermediate in the synthesis of certain drugs, particularly those with antimicrobial properties. Its chemical structure allows it to act as a building block for more complex molecules that are active against a range of pathogens.

Additionally, MMT finds application in the field of photography as an additive in developing solutions. It helps to enhance the stability and quality of photographic images by controlling the development process and preventing unwanted side reactions.

In the realm of organic synthesis, MMT is employed as a reagent for the introduction of the tetrazole ring into various compounds. This is particularly useful in the development of new materials and chemicals with specific desired properties.

Overall, the versatility of 5-Mercapto-1-methyltetrazole makes it a valuable compound in multiple industries, contributing to advancements in corrosion protection, pharmaceuticals, photography, and chemical synthesis.