Potassium perchlorate is a colorless crystalline solid. It dissolves in water only a little. It is an oxidizing agent. It can react with glucose to make carbon dioxide, potassium chloride, and water. It can be mixed with sulfur, while potassium chlorate cannot safely be mixed.
It is used as a rocket propellant. It can also be used in fireworks and other explosives. Ammonium perchlorate is used more, though.