Sodium hydroxide |
Synonyms & Trade Names Caustic soda, Lye, Soda lye, Sodium hydrate |
CAS No. 1310-73-2 |
RTECS No. WB4900000 |
DOT ID & Guide 1823 154 (dry, solid)
1824 154 (solution) |
FormulaNaOH |
Conversion |
IDLH 10 mg/m3
See: 1310732 |
Exposure Limits NIOSH REL: C 2 mg/m3
OSHA PEL†: TWA 2 mg/m3 |
Measurement Methods
NIOSH 7401
See: NMAM or OSHA Methods |
Physical Description Colorless to white, odorless solid (flakes, beads, granular form). |
MW: 40.0 |
BP: 2534°F |
MLT: 605°F |
Sol: 111% |
VP: 0 mmHg (approx) |
IP: NA |
Sp.Gr: 2.13 |
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. |
Incompatibilities & Reactivities Water; acids; flammable liquids; organic halogens; metals such as aluminum, tin & zinc; nitromethane [Note: Corrosive to metals.] |
Exposure Routes inhalation, ingestion, skin and/or eye contact |
Symptoms irritation eyes, skin, mucous membrane; pneumonitis; eye, skin burns; temporary loss of hair |
Target Organs Eyes, skin, respiratory system |
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Personal Protection/Sanitation (See protection codes)
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 |
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 |
| See also: INTRODUCTION See ICSC CARD: 0360 See MEDICAL TESTS: 0210 |
