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Methylene chloride
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General Description
    Synonyms: Methylene dichloride; Dichloromethane; Composite Constituent

    OSHA IMIS Code Number: 1730

    Chemical Abstracts Service (CAS) Registry Number: 75-09-2

    NIOSH, Registry of Toxic Effects (RTECS) Identification Number: PA8050000

    Department of Transportation Regulation Number (49 CFR 172.101) and guide [2008 Emergency Response Guidebook, 2.5 MB PDF]: 1593 160

    NIOSH Pocket Guide to Chemical Hazards, Methylene chloride: chemical description, physical properties, potentially hazardous incompatibilities, and more
Exposure Limits
    OSHA Permissible Exposure Limit (PEL) for General Industry: 29 CFR 1910.1052 -- 25 ppm TWA; 125 ppm STEL; 12.5 ppm Action Level

    OSHA Permissible Exposure Limit (PEL) for Construction Industry: 29 CFR 1926.1152 requirements identical to 1910.1052

    OSHA Permissible Exposure Limit (PEL) for Maritime: 29 CFR 1915.1052 requirements identical to 1910.1052

    American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 50 ppm, 174 mg/m3 TWA; Appendix A3 - Confirmed Animal Carcinogen with Unknown Relevance to Humans; BEI®

    National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): Appendix A - NIOSH Potential Occupational Carcinogens
Health Factors
    Potential symptoms: Fatigue, weakness, sleepiness, lightheadedness; numb limbs, tingling; nausea; eye, skin irritation; (carcinogenic)

    Health Effects: Chemical anoxia (Metabolic conversion to CO) (HE17) Cumulative liver damage (HE3) CNS effects/Narcosis (HE8); Mutagen (HE2)

    Affected organs: Skin, CVS, eyes, CNS
Monitoring Methods used by OSHA
    Laboratory Sampling/Analytical Method:

    • sampling media: Carbosieve S-III Tube (130/65 mg sections, 60/80 mesh)
      analytical solvent: (99:1) Carbon Disulfide/Dimethylformamide
      maximum volume: 3 Liters   maximum flow rate: 0.05 L/min (TWA)
      minimum time: 5 Minutes  maximum flow rate: 0.05 L/min (Ceiling or STEL)
      minimum time: 5 Minutes   maximum flow rate: 0.05 L/min (Peak)
      current analytical method: Gas Chromatography; GC/FID
      method reference: OSHA Analytical Methods (OSHA 80)
      method classification: Fully Validated


    • sampling media: Charcoal Tube (350/350/350 mg sections, 20/40 mesh)
      analytical solvent: Carbon Disulfide
      alternative solvent: (99:1) Carbon Disulfide/Dimethylformamide
      maximum volume: 10 Liters   maximum flow rate: 0.05 L/min (TWA)
      minimum time: 5 Minutes  maximum flow rate: 0.05 L/min (Ceiling or STEL)
      minimum time: 5 Minutes   maximum flow rate: 0.05 L/min (Peak)
      current analytical method: Gas Chromatography; GC/FID
      method reference: OSHA Analytical Methods (OSHA 59)
      method classification: Fully Validated

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