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| Sodium hydroxide | CAS 1310-73-2 | ||
| NaOH | RTECS WB4900000 | ||
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Synonyms & Trade Names Caustic soda, Lye, Soda lye, Sodium hydrate |
DOT ID & Guide 1823 154 (dry, solid) 1824 154 (solution) |
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Exposure Limits |
NIOSH REL: C 2 mg/m3 | ||
| OSHA PEL†: TWA 2 mg/m3 | |||
| IDLH 10 mg/m3 See: 1310732 | Conversion | ||
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Physical Description Colorless to white, odorless solid (flakes, beads, granular form). |
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MW: 40.0 |
BP: 2534°F |
MLT: 605°F |
Sol: 111% |
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VP: 0 mmHg (approx) |
IP: NA |
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Sp.Gr: 2.13 |
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Fl.P: NA |
UEL: NA |
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 |
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Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: Daily Provide: Eyewash, Quick drench |
First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately |
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Important additional information about respirator selection 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 a high-efficiency particulate filter/(APF = 25) Any powered, air-purifying respirator with a dust and mist 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 a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus |
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| Exposure Routes inhalation, ingestion, skin and/or eye contact | |
| 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 |