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Chemical Sampling Information (CSI)
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General Description

Synonyms: Unsymmetrical Dimethylhydrazine; UDMH

OSHA IMIS Code Number: 0940

Chemical Abstracts Service (CAS) Registry Number: 57-14-7

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: MV2450000; 40542

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: UN1163 Poison, Flammable Liquid, Corrosive

NIOSH Pocket Guide to Chemical Hazards, 1, 1-Dimethylhydrazine: Physical description, chemical properties, potentially hazardous incompatibilities, and more

Chemical Description and Physical Properties:

fuming, colorless liquid with an amine-like odor
molecular weight: 60
vapor pressure: 103 mm
boiling point: 146°F
melting point: -71°F

Incompatabilities: Oxidizers, halogens, metallic mercury, fuming nitric acid, hydrogen peroxide

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 0.5 ppm, 1 mg/m3 (Skin)

Construction Industry: 0.5 ppm, 1 mg/m3 TWA (Skin)

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 0.01 ppm TWA (Skin); Appendix A3 (Confirmed Animal Carcinogen with Unknown Relevance to Humans)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 0.06 ppm Ceiling (120 min), Potential Carcinogen

Health Factors

Carcinogenic Classification:

International Agency for Research on Cancer (IARC): Group 2B, possibly carcinogenic to humans [381 KB PDF, 171 pages]

Potential Symptoms: Eye, skin irritation; choking, chest pain, dyspnea; lethargy; nausea; anoxia; convulsions; liver injury; (carcinogenic)

Health Effects: Mutagen (HE2); CNS effects (HE8); Anemia (HE12)

Affected Organs: CNS, liver, gastrointestinal tract, blood, respiratory system, eyes, skin

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Midget Fritted Glass Bubbler (MFGB) 15 mL 0.1N HCl
    maximum volume: 100 Liters
    maximum flow rate: 1.0 L/min
    current analytical method: Colorimetric Analysis
    method reference: 1 (NIOSH 3515 [18 KB PDF, 3 pages]. This revises NIOSH S-143.)
    sampling and analytical error: 0.10
    method classification: Fully Validated

Secondary Sampling Analytical/Method (SAM2):

  • device: Detector Tube
    company: MSA
    part #: 460425
    range: 0.5-50 ppm
    method classification: Fully Validated

  • device: Instrumentation
    company: Infrared Spectrophotometer
    part #: MIRAN 1A & 1B
    range: 0.3 ppm @ 11.2 um
    class: Mfg

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