Hazard Xn: Harmful;F: Flammable;
Risk R11
Safety A poison by ingestion. See also BORON COMPOUNDS. A relatively inert metal except in the form of powder or when exposed to highly oxidizing agents. Amorphous boron is very reactive, sometimes violently. Flammable in the form of dust when exposed to air, or by chemical reaction. An explosion hazard in the form of dust, which ignites on contact with air. Reacts with NaOH at 5°, Na2CO3 at 8°. Reacts explosively when ground with lead fluoride or silver fluoride. Ignites in contact with gaseous chlorine or fluorine at room temperature. Incompatible with NH3, Br2, BrF3, Cs2C2, Cl2, CuO, HIO3, PbO2, HNO3, NO, NOF, N2O, KClO3, KNO3, Rb2C2, S, BrF5, IF5, metal fluorides, interhalogens, nitryl fluoride (FNO2), OF2, KNO2, NOx, Na2O2, PbO, air. See also POWDERED METALS.
