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Physical Properties <br /> Chemical Formula: SO2 <br /> Flash Point: data unavailable <br /> Lower Explosive Limit(LEL):data unavailable <br /> Upper Explosive Limit(UEL):data unavailable <br /> Autoignition Temperature: Not flammable(USCG, 1999) <br /> Melting Point: -98.9 'F(EPA, 1998) <br /> Vapor Pressure: 2432 min Hg at 68.0'F(EPA, 1998) <br /> Vapor Density(Relative to Air): 2.26(EPA, 1998) <br /> Specific Gravity: 1.434(EPA, 1998) <br /> Boiling Point: 14 'F at 760.0 min Hg(EPA, 1998) <br /> Molecular Weight: 64.07(EPA, 1998) <br /> Water Solubility: 10 % (NIOSH, 2003) <br /> IDLH: 100 ppm(NIOSH,2003) <br /> AEGLs(Acute Exposure Guideline Levels) <br /> Final AEGLs for Sulfur Dioxide(7446-09-5) <br /> Exposure Period' AEGL-1 1 AEGL-2 AEGL-3 '; <br /> ........... <br /> 10 minutes 0.2 ppm 0.75 ppm i 30 ppm. 1 <br /> 30 minutes 0.2 ppm. 0.75 ppm 130 ppm <br /> 0.75 ppm 30 ppm <br /> 60 minutes : 0.2 ppm <br /> 4 hours 0.2 ppm 10.75 ppm 19 ppm. <br /> 8 hours 0.2 ppm 0.75 ppm.19.6 ppm <br /> (NAC/NRC, 2013) <br /> ERPGs(Emergency Response Planning Guidelines) <br /> Chemical ERPG-1 ERPG-2:ERP -31 <br /> Sulfur Dioxide(7446-09-5) i 0.3 ppm 3 ppm 25 ppm <br /> Ot indicates that odor should be detectable near ERPG-1. <br /> (AIHA, 2013) <br /> PACs(Protective Action Criteria) <br /> Chemical PAC-1 PAC-2 PAC-3 <br /> ---------- <br /> Sulfur dioxide(7446-09-5) 0.2 ppm 0.75 ppm 30 ppm <br /> (SCAPA, 2012) <br /> Regulatory Information <br /> http://127.0.0.1:54673/report?key=CHI 554 4/15/2015 <br />