Soluble in water, alcohol, glycerol, ether and essential oil, the aqueous solution is weakly acidic. Widely used in glass (optical glass, acid-resistant glass, heat-resistant glass and glass fiber for insulating materials) industry, which can improve the heat resistance and transparency of glass products, improve the mechanical strength and shorten the melting time.
Extended data:
White powdery crystal or scaly shiny crystal with triclinic axis. Odorless, slightly sour, bitter with sweet. Contact with the skin has a greasy feeling. Exposure to air has not changed. Can volatilize with water vapor. When heated to 100 ~ 105℃, a water molecule is lost to form metaboric acid, which is converted into pyroboric acid when heated to 104 ~ 160℃ for a long time, and anhydrous substance is formed at higher temperature. The pH of 0. 1mol/L aqueous solution is 5. 1. 1g is soluble in 18ml cold water, 4ml boiling water, 18ml cold ethanol, 6ml boiling ethanol and 4ml glycerol.
Adding hydrochloric acid, citric acid and tartaric acid can increase the solubility in water. The relative density is 1.4347. Melting point 184℃ (decomposition). The boiling point is 300℃. The median lethal dose (oral) of rats was 5. 14G/kG. Irritating. Toxic, if taken orally, it will lead to death. The lowest lethal dose: adult 640mg/kg, skin 8.6g/kg, vein 29 mg/kg; Infants take 200mg/kg orally. The maximum allowable concentration in the air is 10mg/m3.