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Wastes <br /> 1 . Those that exhibit a "characteristic' hazard like: <br /> — Ignitable - if the waste is a liquid and has a <br /> flashpoint less than 140 degrees F. <br /> — Corrosive - If the waste has a pH of 2 or less, <br /> or 12.5 or more, or if it corrodes steel at a <br /> certain rate. <br /> 16 <br />