Characteristics: Silvery solid or dark grey amorphous powder, as strong as steel but 45% lighter. Vickers hardness 80-100. Excellent resistance to atmospheric and seawater corrosion, and to corrosion by chlorine, chlorinated solvents and sulfur compounds. Reactive when hot or molten. Insoluble in water. Inert to nitric acid but attacked by concentrated sulfuric acid and hydrochloric acid. Unaffected by strong alkalies. Low toxicity.
Hazards: (dry powder) Flammable, dangerous fire and explosion risk. (Metal) Ignites in air at 1200 °C; will burn in atmosphere of nitrogen. Do not use water or carbon dioxide to extinguish.