Corrosive Corrosive or caustic means that a chemical can burn through metal and skin. An acid is a good example of a corrosive. Strong acids can start to burn through metal containers and your skin immediately on contact - acute effects happen immediately. Drain cleaners and rust removers are two corrosive products. Gunpowder is another type of explosive.
Some products can have dangerous reactions without exploding, too.
These are called reactives.