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Chemical Sampling Information |
Calcium hydroxide |
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General Description
Synonyms: Calcium hydrate; Caustic lime; Hydrated lime; Slaked lime
OSHA IMIS Code Number: 0515
Chemical Abstracts Service (CAS) Registry Number: 1305-62-0
NIOSH, Registry of Toxic Effects (RTECS) Identification Number: EW2800000
NIOSH Pocket Guide to Chemical Hazards, Calcium hydroxide: chemical description, physical properties, potentially hazardous incompatibilities, and more
Exposure Limits
OSHA Permissible Exposure Limit (PEL) for General Industry: 29 CFR 1910.1000 Z-1 Table -- 5 mg/m3 TWA (Respirable Fraction); 15 mg/m3 TWA (Total Dust)
OSHA Permissible Exposure Limit (PEL) for Maritime: 29 CFR 1915.1000 Table Z-Shipyards -- 5 mg/m3 TWA (Respirable Fraction); 15 mg/m3 TWA (Total Dust)
American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 5 mg/m3 TWA
National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 5 mg/m3 TWA
Health Factors
Potential symptoms: Irritation of eyes, skin, upper respiratory system; eye, skin burns; skin vesiculation; cough, bronchitis, pneumonitis.
Health Effects: Irritation-Eye, Nose, Throat, Skin---Marked (HE14)
Affected organs: Eyes, skin, respiratory system
Notes:
- Calcium hydroxide is affirmed by the FDA as a generally recognized as safe (GRAS) direct food substance (21 CFR 184.1205).
- Prolonged contact with wet cement, which is alkaline due to the reaction of water with calcium oxide to form calcium hydroxide, can result in full-thickness skin burns that may require surgical treatment.
Date Last Revised: 06/04/2007
Literature Basis:
- NIOSH Pocket Guide to Chemical Hazards: Calcium hydroxide.
- International Chemical Safety Cards (WHO/IPCS/ILO): Calcium hydroxide.
- Pohanish, R.P. (editor): Calcium Hydroxide. In, Sittig’s Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 464-465.
- Sherman S.C. and Larkin, K.: Cement burns. J. Emerg. Med. 29(1): 97-99, 2005.
- Spoo, J. and Elsner, P.: Cement burns: a review 1960-2000. Contact Dermatitis 45(2): 68-71, 2001.
- Winder, C. and Carmody, M.: The dermal toxicity of cement. Toxicol. Ind. Health 18(7): 321-331, 2002.
Monitoring Methods used by OSHA
Laboratory Sampling/Analytical Method:
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sampling media: Mixed Cellulose Ester Filter (MCEF) 0.8 microns
maximum volume: 960 Liters minimum volume: 480 Liters maximum flow rate: 2.0 L/min
current analytical method: Atomic Absorption Spectroscopy; AAS
method reference: OSHA Analytical Method (OSHA ID-121)
method classification: Partially Validated
note: Submit as a separate sample. If the filter is not overloaded, samples may be collected up to an 8-hour period. When analysis of a compound is requested, an elemental analysis is performed and reported as the compound.
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