NIOSH Pocket Guide to Chemical Hazards

Cesium hydroxide

CAS 21351-79-1

CsOH

RTECS FK9800000
Synonyms & Trade Names
Cesium hydrate, Cesium hydroxide dimer
DOT ID & Guide
2682 157
2681 154 (solution)

Exposure
Limits

NIOSH REL: TWA 2 mg/m3
OSHA PEL†: none
IDLH N.D. See: IDLH INDEX Conversion
Physical Description
Colorless or yellowish, crystalline solid. [Note: Hygroscopic (i.e., absorbs moisture from the air).]
MW: 149.9
BP: ?
MLT: 522°F
Sol(59°F): 395%
VP: 0 mmHg (approx)
IP: NA

Sp.Gr: 3.68
Fl.P: NA
UEL: NA
LEL: NA

Noncombustible Solid
Incompatibilities & Reactivities
Water, acids, CO2, metals (e.g., Al, Pb, Sn, Zn), oxygen [Note: CsOH is a strong base, causing the generation of considerable heat in contact with water or moisture.]
Measurement Methods
None available
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
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations Not available.
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, upper respiratory system; eye, skin burns
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION