Sodium hydroxide
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CAS
1310-73-2
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NaOH
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RTECS
WB4900000
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Synonyms & Trade Names
Caustic soda, Lye, Soda lye, Sodium hydrate
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DOT ID & Guide
1823 / 154 (dry, solid)
1824 / 154 (solution)
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Exposure
Limits
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NIOSH REL: C 2 mg/m3
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OSHA PEL†: TWA 2 mg/m3
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IDLH
10 mg/m3
See: 1310732
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Conversion
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Physical Description
Colorless to white, odorless solid (flakes, beads, granular form).
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MW: 40.0
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BP: 2534°F
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MLT: 605°F
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Sol: 111%
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VP: 0 mmHg (approx)
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IP: NA
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Sp.Gr: 2.13
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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, but when in contact with water may generate sufficient heat to ignite combustible materials.
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Incompatibilities & Reactivities
Water; acids; flammable liquids; organic halogens; metals such as aluminum, tin & zinc; nitromethane [Note: Corrosive to metals.]
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Measurement Methods
NIOSH 7401
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash, Quick drench
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First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
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Respirator Recommendations
NIOSH/OSHA
Up to 10 mg/m3:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode£
(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters.
(APF = 25) Any powered air-purifying respirator with a high-efficiency particulate filter.£
(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 with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
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; pneumonitis; eye, skin burns; temporary loss of hair
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Target Organs
Eyes, skin, respiratory system
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See also: INTRODUCTION
See ICSC CARD: 0360 See MEDICAL TESTS: 0210
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