Ammonium biborate, also known as ammonium borate, is an inorganic compound with the chemical formula NH4B5O8·4H2O. It is a white crystalline solid that is soluble in water and is weakly alkaline in solution. Ammonium biborate is a borate produced by the reaction of boric acid and ammonia, and is commonly used as a buffer, corrosion inhibitor, fertilizer, and flux in the glass and ceramic industries.

1. Trace element fertilizer: Ammonium biborate is an important boron fertilizer, boron is an essential trace element for plant growth, which is essential to promote flower bud differentiation, pollen germination and pollination process of plants. It is commonly used to fertilize crops such as canola, cotton, fruits, and vegetables to improve crop quality and increase yields.

2. Buffer: Ammonium biborate can be used as a buffer solution in chemical analysis to help maintain the pH stability of the solution, especially under the condition that the pH value is close to neutral.

3. Corrosion inhibitor: In metalworking and corrosion protection, ammonium biborate can be used as a corrosion inhibitor to slow down the corrosion rate of metals.

4. Flux: In the glass and ceramic industry, ammonium biborate can be used as a flux to reduce the melting temperature, improve the fluidity of the product and reduce bubbles.

5. Wood preservative: Ammonium biborate can also be used as a wood preservative to prevent wood decay and insect infestation.

6. Medicines and health products: Ammonium biborate, as a source of boron, can be used in the pharmaceutical industry and health products for the prevention and treatment of boron deficiency-related health problems.

7. Detergents and preservatives: Ammonium biborate can also be used in detergents and preservatives, especially in applications where microbial growth needs to be controlled.