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Chlorine dioxide or ClO2, is a chemical compound that is commonly used in pulp bleaching and water treatment processes. Because it is very unstable and can react violently, chlorine dioxide poses a number of health hazards. Therefore, it should be manufactured, stored, and handled very carefully
Pure ClO2 has a boiling point of 52 degrees Fahrenheit at normal atmospheric pressure. This means that at room temperature, pure ClO2 is a gas that is yellow or reddish-yellow in color. Below 52 degrees Fahrenheit, chlorine dioxide is a reddish-brown liquid. And below minus 74 degrees Fahrenheit, it forms into bright orange crystals. A 10 grams per liter solution of chlorine dioxide is a pale greenish liquid. It has a strong, unpleasant odor similar to chlorine. This module describes the uses of chlorine dioxide, the hazards it presents, and how to protect yourself from exposure.