Calcium hydroxide (Total Dust)
- Synonyms: Calcium hydrate; Caustic lime; Hydrated lime; Slaked lime
- OSHA IMIS Code Number: 0515
- IMIS Name History: Calcium hydroxide prior to 10/1/09
- Chemical Abstracts Service (CAS) Registry Number: 1305-62-0
- NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: EW2800000
- NIOSH Pocket Guide to Chemical Hazards, Calcium hydroxide: chemical description, physical properties, potentially hazardous incompatibilities, and more
- OSHA Permissible Exposure Limit (PEL):
- General Industry: 29 CFR 1910.1000 Table Z-1 - 15 mg/m3 TWA
- Maritime: 29 CFR 1915.1000 Table Z-Shipyards - 15 mg/m3 TWA
- 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
- 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
- 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.
- 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
Primary Laboratory Sampling/Analytical Method (SLC1):
- Tared 37-mm diameter low-ash polyvinyl chloride filter
- maximum volume: 960 Liters
- minimum volume: 480 Liters
- maximum flow rate: 2.0 L/min
- current analytical method: Gravimetric
- analytical solvent: (95:5) Methylene Chloride/Methanol
- method reference: OSHA Analytical Method (OSHA PV2121)
- method classification: Partially Validated
- current elemental analysis method: Atomic Absorption Spectroscopy; AAS
- method reference: OSHA Analytical Method (OSHA ID-121)
- method classification: Fully Validated
- note: OSHA personnel can obtain tared sampling media from the Salt Lake Technical Center (SLTC).
- note: If the net weight of the sample yields a concentration below the standard for the substance, the Salt Lake Technical Center (SLTC) will perform no further work on that sample. If the net weight corresponds to an amount greater than the standard, the sample may be analyzed for the appropriate element and the result reported as the substance.
- note: Submit as a separate sample. When analysis of a compound is requested, an elemental analysis is performed and reported as the compound.
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