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Chemical Sampling Information (CSI)
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General Description

Synonyms: Caustic potash; Lye; Potassium hydrate

OSHA IMIS Code Number: 2140

Chemical Abstracts Service (CAS) Registry Number: 1310-58-3

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: TT2100000

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: 1813 154 (dry, solid); 1814 154 (solution)

NIOSH Pocket Guide to Chemical Hazards, Potassium Hydroxide: chemical description, physical properties, potentially hazardous incompatibilities, and more

Exposure Limits

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 2 mg/m3 Ceiling

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 2 mg/m3 Ceiling

Health Factors

Potential Symptoms: Irritation of eyes, skin, respiratory system; cough, sneezing; eye, skin burns; vomiting; diarrhea; sore throat; labored breathing, shortness of breath; pulmonary edema, pneumonitis; redness, pain, blisters; blurred vision, blindness; sores in nose, perforated septum; INGES ACUTE: Corrosive, burning sensation; epigastric or abdominal pain; hematemesis; shock or collapse

Health Effects: Irritation-Eye, Nose, Throat, Skin---Marked (HE14); Respiratory effects (HE10 and HE11); Acute high risk toxicity by ingestion or immersion (HE4)

Affected Organs: Eyes, skin, respiratory system

Notes:

  1. Affirmed by the FDA as a GRAS (generally recognized as safe) Direct Food Substance when used at levels consistent with current good manufacturing practice (21 CFR 184.1631).

Literature Basis:

  • NIOSH Pocket Guide to Chemical Hazards: Potassium Hydroxide.
  • International Chemical Safety Cards (WHO/IPCS/ILO): Potassium hydroxide.
  • Pohanish, R.P. (editor): Potassium Hydroxide. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 2. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 1925-1926.

Date Last Revised: 07/26/2004

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Mixed Cellulose Ester Filter (MCEF) 0.8 microns
    maximum volume: 30 Liters
    maximum flow rate: 2.0 L/min (Ceiling)
    current analytical method: Atomic Absorption Spectroscopy; AAS
    method reference: OSHA Analytical Method (OSHA ID-121)
    method classification: Validated
    note: Submit as a separate sample. When analysis of the compound is requested, an elemental analysis is performed and reported as the compound.

Wipe Sampling Method:

  • sampling media: Whatman smear tab
    analytical solvent: Deionized water

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