Sodium metabisulfite
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CAS
7681-57-4
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Na2S2O5
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RTECS
UX8225000
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Synonyms & Trade Names
Disodium pyrosulfite, Sodium metabisulphite, Sodium pyrosulfite
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DOT ID & Guide
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Exposure
Limits
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NIOSH REL: TWA 5 mg/m3
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OSHA PEL†: none
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IDLH
N.D.
See: IDLH INDEX
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Conversion
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Physical Description
White to yellowish crystals or powder with an odor of sulfur dioxide.
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MW: 190.1
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BP: Decomposes
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MLT: >302°F (Decomposes)
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Sol: 54%
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VP: ?
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IP: NA
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Sp.Gr: 1.4
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Fl.P: NA
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UEL: NA
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LEL: NA
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Noncombustible Solid
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Incompatibilities & Reactivities
Heat (decomposes) [Note: Slowly oxidized to the sulfate on exposure to air & moisture.]
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Measurement Methods
NIOSH 0500
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: No recommendation
Eyes: No recommendation
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation
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First Aid (See procedures)
Eye: Irrigate immediately
Breathing: Fresh air
Swallow: Medical attention immediately
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Respirator Recommendations
Not available.
Important additional information about respirator selection
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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Symptoms
Irritation eyes, skin, mucous membrane
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Target Organs
Eyes, skin, respiratory system
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