... -metal oxide. Specific gravity : 2.33 -2.45 When Boron powder and non-oxygen acid e.g. HF, HCl,etc. are ... is applied to atomic reactor. 2. In metallurgy industry, Boron powder can be smelted with metal to form metal boride at ... semiconductor and electric industry, after being carbonized at 2300, Boron powder can be used as cathode of ignition core in ignitron ...