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• <br />Methyl IsobutvI Ketone <br />Methyl isobutyl ketone is a .clear liquid with a characteristic <br />odor. <br />Short-term exposure to methyl isobutyl ketone can cause irritation <br />of the conjunctiva, mucous membranes of the nose and throat, and <br />produce eye and throat symptoms. Methyl isobutyl ketone can also <br />cause narcosis with symptoms of weakness, headache, nausea, light- <br />headedness, vomiting, dizziness, and incoordination. <br />The PEL for methyl isobutyl ketone'is 50 ppm in air. <br />11 <br />* . 40 <br />