A material that can attack and chemically destroy exposed body tissues, and can also damage or even destroy metal. They begin to cause damage as soon as they touch the skin, eyes, respiratory tract, digestive tract, or the metal. They might be hazardous in other ways too, depending on the particular corrosive material. (Some governmental agencies, e.g., the US DOT and EPA have specific definitions of corrosive based on rate of corrosion (DOT) or pH (EPA). Readers should check these definitions as applicable.)
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