... is produced diboride matrix material, and its metal welding, leather, precious stones, electronics, defense and scientific research departments have widely applied.We ... water solution indicating weak acidity. when heating to 70-100ºC, hydro-extracting gently to change into meta-boric acid; 150 ... -160ºC, as pyro-boric acid:300ºC, as boric anhydride(B2O3). 4.Packaging: ...