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Distillates (petroleum), chemically neutralized middle is a complex combination of hydrocarbons produced by a treating process to remove acidic materials. It consists of hydrocarbons having carbon numbers predominantly in the range of C11 through C20 and boiling in the range of approximately 205.degree.C to 345.degree.C (401.degree.F to 653.degree.F).

The initial threshold screening level (ITSL) for distillates (petroleum), chemically neutralized middle is 2 micrograms per cubic meter (μg/m3) based on an annual averaging time.