... almost all metal, metal oxide and non-metal oxide. Specific gravity : 2.33 -2.45 When Boron powder and ... , HCl,etc. are in stable condistion at temperature of boiling point. If temperature is lower than 500, ... phyiscal character, such metal boride can take place of preciouse and scared metal, also cost can be saved ... , Boron powder can be used as cathode of ignition core in ignitron. It is also raw ...