Boric acid, with the chemical formula H₃BO₃, is a white powdery crystal or a scaly lustrous crystal on a triclinic axis, with a smooth hand feeling and no odor. Dissolved in water, alcohol, glycerin, ethers and essential oils, the aqueous solution is weakly acidic. It is widely used in the glass (optical glass, acid-resistant glass, heat-resistant glass, glass fiber for insulating materials) industry, which can improve the heat resistance and transparency of glass products, increase the mechanical strength, and shorten the melting time.