International Chemical Safety Cards

METHYL CHLORIDE ICSC: 0419

METHYL CHLORIDE
Chloromethane
Monochloromethane
(cylinder)
CH3Cl
Molecular mass: 50.5
CAS # 74-87-3
RTECS # PA6300000
ICSC # 0419
UN # 1063
EC # 602-001-00-7
TYPES OF
HAZARD/
EXPOSURE 		ACUTE HAZARDS/
SYMPTOMS 		PREVENTION FIRST AID/
FIRE FIGHTING
FIRE Highly flammable. Heating will cause rise in pressure with risk of bursting.
NO open flames, NO sparks, and NO smoking.
Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out; in other cases extinguish with water spray.
EXPLOSION Gas/air mixtures are explosive.
Closed system, ventilation, explosion-proof electrical equipment and lighting. Use non-sparking handtools.
In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position.
EXPOSURE
STRICT HYGIENE!

  • INHALATION
    		• Convulsions. Dizziness. Headache. Nausea. Unconsciousness. Vomiting. Staggering gait.
    		Ventilation, local exhaust, or breathing protection.
    		Fresh air, rest. Artificial respiration if indicated. Refer for medical attention.
  • SKIN
    		• MAY BE ABSORBED! ON CONTACT WITH LIQUID: FROSTBITE.
    		Cold-insulating gloves. Protective clothing.
    		ON FROSTBITE: rinse with plenty of water, do NOT remove clothes.
  • EYES
    		• (See Skin).
    		Safety goggles, face shield, or eye protection in combination with breathing protection.

  • INGESTION



    • SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING
    Evacuate danger area! Consult an expert! Ventilation. NEVER direct water jet on liquid (extra personal protection: complete protective clothing including self-contained breathing apparatus).
    		Fireproof if in building.

    F+ symbol
    Xn symbol
    R: 12-40-48/20
    S: (2)-9-16-33
    UN Hazard Class: 2.1
    SEE IMPORTANT INFORMATION ON BACK
    ICSC: 0419 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993 No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and IDLH values.

    International Chemical Safety Cards

    METHYL CHLORIDE ICSC: 0419

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    PHYSICAL STATE; APPEARANCE:
     COLOURLESS LIQUEFIED GAS.

    PHYSICAL DANGERS:
     The gas is heavier than air and may travel along the ground; distant ignition possible, and may accumulate in low ceiling spaces causing deficiency of oxygen.

    CHEMICAL DANGERS:
     The substance decomposes on burning producing toxic and corrosive fumes including hydrogen chloride and phosgene. Reacts violently with powdered aluminium, powdered zinc, aluminium trichloride and ethylene causing fire and explosion hazard. Attacks many metals in the presence of moisture.

    OCCUPATIONAL EXPOSURE LIMITS (OELs):
     TLV: 50 ppm; 103 mg/m3 STEL: 100 ppm; 207 mg/m3 (skin) (ACGIH 1994-1995).
    OSHA PEL: TWA 100 ppm C 200 ppm 300 ppm (5-minute maximum peak in any 3 hours)
    NIOSH REL: Ca See Appendix A
    NIOSH IDLH: Potential occupational carcinogen 2000 ppm


    		ROUTES OF EXPOSURE:
     The substance can be absorbed into the body by inhalation and through the skin.

    INHALATION RISK:
     A harmful concentration of this gas in the air will be reached very quickly on loss of containment.

    EFFECTS OF SHORT-TERM EXPOSURE:
     The liquid may cause frostbite. The substance may cause effects on the central nervous system, liver, kidneys and lungs , resulting in impaired functions. Exposure may result in liver and kidney damage. Medical observation is indicated.

    EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
     Animal tests show that this substance possibly causes toxic effects upon human reproduction.
    PHYSICAL
    PROPERTIES
    Boiling point: -24.2°C
    Melting point: -97.6°C
    Relative density (water = 1): 0.92
    Vapour pressure, kPa at 21°C: 506
    		 Relative vapour density (air = 1): 1.8
    Flash point: Flammable Gas
    Auto-ignition temperature: 632°C
    Explosive limits, vol% in air: 8.1-17.4%
    ENVIRONMENTAL
    DATA
    N O T E S
    ARTIC is a trade name.
    Transport Emergency Card: TEC (R)-41/20G12
    NFPA Code: H2; F4; R0;
    ADDITIONAL INFORMATION


    ICSC: 0419 METHYL CHLORIDE
    © IPCS, CEC, 1993
    IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and IDLH values.