Ignition, boron carbides

LEAD PROTOXIDE (1317-36-8) PbO An oxidizer. Explosive reaction with 90% peroxyformic acid, mbidium acetylide. Reacts violently with strong oxidizers, aluminum carbide boron, chlorine, fluorine, dichloromethylsilane, calcium sulfide, hydrogen peroxide, hydrogen trisulfide (ignition), hydroxylamine (ignition), lithium carbide, metal acetylides, metal powders (e.g., aluminum, molybdenum, sodium, zirconium, etc.), perchloric acid, red phosphoms, selenium oxychloride, sodium. 

Finely divided boron, tetraboron carbide, and boron—aluminium mixtures will ignite on exposure to the gas. 

Ignition or explosive reaction with metals (e.g., aluminum, antimony powder, bismuth powder, brass, calcium powder, copper, germanium, iron, manganese, potassium, tin, vanadium powder). Reaction with some metals requires moist CI2 or heat. Ignites with diethyl zinc (on contact), polyisobutylene (at 130°), metal acetylides, metal carbides, metal hydrides (e.g., potassium hydride, sodium hydride, copper hydride), metal phosphides (e.g., copper(II) phosphide), methane + oxygen, hydrazine, hydroxylamine, calcium nitride, nonmetals (e.g., boron, active carbon, silicon, phosphoms), nonmetal hydrides (e.g., arsine, phosphine, silane), steel (above 200° or as low as 50° when impurities are present), sulfides (e.g., arsenic disulfide, boron trisulfide, mercuric sulfide), trialkyl boranes. 

LEAD DIFLUORIDE (7783-46-2) F,Pb Noncombustible solid. Reacts violently with boron, fluorine, calcium carbide (causing ignition). Thermal decompostion releases fluorides and lead fumes. Inorganic lead is a human carcinogen. 

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