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Chemical Sampling Information (CSI)
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General Description

OSHA IMIS Code Number: 0925

Chemical Abstracts Service (CAS) Registry Number: 108-18-9

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: IM4025000; 31580

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: UN1158 Flammable Liquid

Chemical Description and Physical Properties:
colorless liquid with ammonia-like odor
molecular weight: 101
boiling point: 183°F
vapor pressure: 60 mm
melting point: -141°F
Incompatibilities: Strong oxidizers and acids


Exposure Limits

OSHA Permissible Exposure Limit (PEL):
General Industry: 5 ppm, 20 mg/m3 (Skin)

Construction Industry: 5 ppm, 20 mg/m3 TWA (Skin)
American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 5 ppm, 21 mg/m3 TWA (Skin)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 5 ppm TWA (Skin)


Health Factors

Potential Symptoms: Nausea, vomiting; headaches; eye irritation, visual disturbance; pulmonary irritation

Health Effects: CNS effects (HE7) Irritation-Eye, Nose, Throat, Skin---Moderate (HE15)

Affected Organs: Respiratory system, skin, eyes

Additional Information:
  • Occupational Health Guidelines for Chemical Hazards. US Department of Health and Human Services (DHHS), National Institute for Occupational Safety and Health (NIOSH) Publication No. 81-123, (1981, January). Provides a table of contents of guidelines for many hazardous chemicals. The files provide technical chemical information, including chemical and physical properties, health effects, exposure limits, and recommendations for medical monitoring, personal protective equipment (PPE), and control procedures.
Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
  • sampling media: Midget Impinger containing 10 mL 0.1N H2SO4
    maximum volume: 120 Liters
    maximum flow rate: 1.0 L/min
    current analytical method: Gas Chromatography; GC/FID
    method reference: 1 (NIOSH S-141)
    sampling and analytical error: 0.12
    method classification: Fully Validated
Secondary Laboratory Sampling/Analytical Method (SAM2):
MIRAN 1A & 1B: MIN. Det. Con. 0.4 ppm at 8.5 um
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