Classification

The EPA classifies hazardous waste according to certain characteristics. These classifications include ignitibility, corrosivity, reactivity and toxicity.

Ignitable and Corrosive

Ignitable materials which generally are liquids with a flashpoint below 60 degrees Celsius or a 140 degrees Fahrenheit are hazardous materials. Corrosive materials usually consist of acids or bases that are capable of corroding metals.

Reactive and Toxic

Hazardous reactive materials are unstable, explosive and react violently with water. Toxic hazardous materials are chemicals that pose a danger to health or environment.

Considerations

Keep in mind that material is also classified as hazardous if it contributes to an increase in mortality or if it contributes to an increase of incapacitating illness.

Disposal

Hazardous waste is usually disposed of in special landfills or through the use of incineration. Also, hazardous waste can be recycled into usable products or treated with biological, chemical or physical methods to make it nonhazardous.

Source:

Environmental Protection Agency: Hazardous Waste

Thinkquest: Hazardous Waste Definition

Environmental Health and Safety: Hazardous Waste Guidelines

Resource:

EPA: Waste Characteristics

Maryland Department of the Environment: Hazardous Waste Program