Sulfur dioxide
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CAS
7446-09-5
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SO2
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RTECS
WS4550000
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Synonyms & Trade Names
Sulfurous acid anhydride, Sulfurous oxide, Sulfur oxide
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DOT ID & Guide
1079 / 125
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Exposure
Limits
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NIOSH REL: TWA 2 ppm (5 mg/m3) ST 5 ppm (13 mg/m3)
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OSHA PEL†: TWA 5 ppm (13 mg/m3)
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IDLH
100 ppm
See: 7446095
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Conversion
1 ppm = 2.62 mg/m3
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Physical Description
Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. Shipped as a liquefied compressed gas.]
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MW: 64.1
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BP: 14°F
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FRZ: -104°F
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Sol: 10%
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VP: 3.2 atm
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IP: 12.30 eV
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RGasD: 2.26
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Fl.P: NA
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UEL: NA
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LEL: NA
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Nonflammable Gas
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Incompatibilities & Reactivities
Powdered alkali metals (such as sodium & potassium), water, ammonia, zinc, aluminum, brass, copper [Note: Reacts with water to form sulfurous acid (H2SO3).]
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Measurement Methods
NIOSH 3800, 6004; OSHA ID104, ID200
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Frostbite
Eyes: Frostbite
Wash skin: No recommendation
Remove: When wet or contaminated (liquid)
Change: No recommendation
Provide: Frostbite wash
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First Aid (See procedures)
Eye: Frostbite
Skin: Frostbite
Breathing: Respiratory support
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Respirator Recommendations
NIOSH
Up to 20 ppm:
(APF = 10) Any chemical cartridge respirator with cartridge(s) providing protection against the compound of concern*
(APF = 10) Any supplied-air respirator*
Up to 50 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode*
(APF = 25) Any powered, air-purifying respirator with cartridge(s) providing protection against the compound of concern*
Up to 100 ppm:
(APF = 50) Any chemical cartridge respirator with a full facepiece and cartridge(s) providing protection against the compound of concern
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern
(APF = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and cartridge(s) providing protection against the compound of concern*
(APF = 50) Any supplied-air respirator that has a tight-fitting facepiece and is operated in a continuous-flow mode*
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece
Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern/Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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Exposure Routes
inhalation, skin and/or eye contact
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Symptoms
Irritation eyes, nose, throat; rhinorrhea (discharge of thin mucus); choking, cough; reflex bronchoconstriction; liquid: frostbite
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Target Organs
Eyes, skin, respiratory system
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See also: INTRODUCTION
See ICSC CARD: 0074 See MEDICAL TESTS: 0215
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