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Registry of Toxic Effects of Chemical Substances (RTECS)

Cesium hydroxide

RTECS #

FK9800000

CAS #

21351-79-1

Updated

September 201

Molecular Weight

149.92

Molecular Formula

CsHO

Synonyms

Cesium hydrate
Cesium hydroxide (ACGIH)
Cesium hydroxide dimer

Skin and Eye Irritation and References

Route/OrganismDoseEffectReference
eye /rabbit 5 mg/5M rinse severeTXAPA9 32,239,1975
skin /rabbit 5 mg/24H mildTXAPA9 32,239,1975

Acute Toxicity Data and References

Route/OrganismDoseEffectReference
eye/rabbit lowest published toxic concentration: 0.4 pphVCVN1* -,59,1998
eye/rabbit lowest published toxic concentration: 0.4 pphEye: Conjunctiva irritation

Eye: Corneal damage

Eye: Other eye effects		VCVN1* -,59,1998
inhalation/human lethal concentration (50 percent kill): 5.02 mg/m3Skin: After topical application: Primary irritationVCVN1* -,58,1998
inhalation/mammal (species unspecified) lethal concentration (50 percent kill): 20.5 mg/m3Eye: Conjunctiva irritation

Lung, Thorax, or Respiration: Cough		VCVN1* -,58,1998
intraperitoneal/rat lethal dose (50 percent kill): 100 mg/kgAIHOAX 1,637,1950
oral/mouse lethal dose (50 percent kill): 800 mg/kgBehavioral: Tetany20PKA3 -,-,1967
oral/mouse lethal dose (50 percent kill): 759 mg/kgVCVN1* -,58,1998
oral/rat lethal dose (50 percent kill): 570 mg/kgVCVN1* -,58,1998
oral/rat lethal dose (50 percent kill): 570 mg/kgBehavioral: Somnolence (general depressed activity)

Behavioral: Muscle contraction or spasticity

Lung, Thorax, or Respiration: Other changes		GTPZAB 21(1),29,1977

Other Multiple Dose Data and References

Route/OrganismDoseEffectReference
inhalation/rat lowest published toxic concentration: 10110 µg/m3/17W- intermittentBrain and Coverings: Recordings from specific areas of CNS

Cardiac: Other changes

Lung, Thorax, or Respiration: Other changes		GTPZAB 21(1),29,1977
inhalation/rat lowest published toxic concentration: 10 mg/m3/16W- continuousBlood: Pigmented or nucleated red blood cells

Blood: Changes in serum composition (e.g. TP, bilirubin, cholesterol)

Blood: Changes in leukocyte (WBC) count		VCVN1* -,59,1998

Reviews

OrganizationStandardReference
American Conference of Governmental Industrial Hygienists (ACGIH)Threshold Limit Value-time-weighted average 2 mg/m3DTLVS* TLV/BEI,2013

Standards and Regulations

OrganizationStandardReference
Occupational Exposure Limit IN ARGENTINA, BULGARIA, COLOMBIA, JORDAN check ACGIH TLV;
Occupational Exposure Limit IN SINGAPORE, VIETNAM check ACGIH TLV
Occupational Exposure Limit-AUSTRALIAtime-weighted average 2 mg/m3, JUL2008
Occupational Exposure Limit-AUSTRIAMAK-TMW 2 mg/m3;KZW 4 mg/m3, inhal, 2007
Occupational Exposure Limit-BELGIUMtime-weighted average 2 mg/m3, MAR2002
Occupational Exposure Limit-DENMARKtime-weighted average 2 mg/m3, MAY2011
Occupational Exposure Limit-FINLANDtime-weighted average 2 mg/m3, NOV2011
Occupational Exposure Limit-FRANCEVME 2 mg/m3, FEB2006
Occupational Exposure Limit-ICELANDtime-weighted average 2 mg/m3, NOV2011
Occupational Exposure Limit-KOREAtime-weighted average 2 mg/m3, 2006
Occupational Exposure Limit-MEXICOtime-weighted average 2 mg/m3, 2004
Occupational Exposure Limit-NEW ZEALANDtime-weighted average 2 mg/m3, JAN2002
Occupational Exposure Limit-PERUtime-weighted average 2 mg/m3, JUL2005
Occupational Exposure Limit-RUSSIAshort term exposure limit 0.3 mg/m3, JUN2003
Occupational Exposure Limit-SWITZERLANDMAK-week 2 mg/m3, inhal, JAN2011
Occupational Exposure Limit-THE NETHERLANDSMAC-TGG 2 mg/m3, 2003
Occupational Exposure Limit-UNITED KINGDOMtime-weighted average 2 mg/m3, OCT2007

NIOSH Documentation and Surveillance

OrganizationStandardReference
National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Level TO CESIUM HYDROXIDE-air10H time-weighted average 2.0 mg/m3NIOSH* DHHS #95-121,1995

Status in Federal Agencies

OrganizationReference
EPA TSCA Section 8(b) CHEMICAL INVENTORY

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