Ammonium biborate tetrahydrate is primarily used in the manufacturing of fire retardants, where it helps to reduce the flammability of materials such as textiles, wood, and plastics. It is also employed in the production of specialty glasses and ceramics, enhancing their thermal and chemical resistance. In the agricultural sector, it serves as a micronutrient fertilizer, providing essential boron to plants for healthy growth. Additionally, it finds application in metal surface treatment processes, where it acts as a flux to remove oxides and improve the quality of metal coatings. Its buffering properties make it useful in certain chemical formulations to maintain stable pH levels.