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Chemical Sampling Information (CSI)
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General Description

Synonyms: Calcium sulfate hemihydrate; Dried calcium sulfate; Gypsum hemihydrate; Hemihydrate gypsum

OSHA IMIS Code Number: 2127

Chemical Abstracts Service (CAS) Registry Number: 26499-65-0

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: TP0700000

NIOSH Pocket Guide to Chemical Hazards, Plaster of Paris: chemical description, physical properties, potentially hazardous incompatibilities, and more

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 29 CFR 1910.1000 Z-1 Table -- 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): 10 mg/m3 TWA; The value is for particulate matter containing no asbestos and <1% crystalline silica. (TLV listed under Calcium Sulfate)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 10 mg/m3 TWA

Health Factors

Potential Symptoms: Irritation of eyes, skin, mucous membranes, respiratory system; cough, nosebleed; INGES. ACUTE: GI blockage if material hardens

Health Effects: Nuisance particulate (HE19)

Affected Organs: Eyes, skin, respiratory system

Notes:

  1. Although a study by NIOSH of causes of death among plasterers found a significant increase (24%) above the expected incidence for lung cancer, this increase was attributed to the asbestos component (5-12% by weight), rather than the plaster of Paris component, of most spackling compounds that were in use up to the late 1960s.

Literature Basis:

  • NIOSH Pocket Guide to Chemical Hazards: Plaster of Paris.
  • International Chemical Safety Cards (WHO/IPCS/ILO): Plaster of Paris.
  • Pohanish, R.P. (editor): Calcium Sulfate. Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 472-474.
  • Stern, F., Lehman, E. and Ruder, A.: Mortality among unionized construction plasterers and cement masons. Am. J. Ind. Med. 39(4): 373-388, 2001.

Date Last Revised: 10/04/2005

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

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