CAS Registry No.: 75-09-2
Other Names: Dichloromethane, Methylene dichloride, DCM
Main Uses: Solvent, paint stripper, chemical and food processing.
Appearance: Colourless liquid.
Canadian TDG: UN1593
D1B - Toxic; D2A - Very Toxic (Carcinogenicity); D2B - Toxic (Skin irritant; Eye irritant)
Emergency Overview: Colourless liquid. Sweet odour. Can ignite if strongly heated. Can form very hazardous decomposition products. CONFINED SPACE HAZARD. SUSPECT CANCER HAZARD. Suspected of causing cancer. TOXIC if inhaled. May cause drowsiness and dizziness. IRRITANT. Causes moderate or severe eye and skin irritation.
Main Routes of Exposure: Inhalation; skin contact; eye contact.
International Agency for Research on Cancer (IARC): Group 2B - Possibly carcinogenic to humans.
American Conference for Governmental Industrial Hygienists (ACGIH): A3 - Confirmed animal carcinogen.
Inhalation: Take precautions to ensure your own safety before attempting rescue (e.g. wear appropriate protective equipment). Move victim to fresh air. Call a Poison Centre or doctor.
Skin Contact: Avoid direct contact. Wear chemical protective clothing if necessary. Take off contaminated clothing, shoes and leather goods (e.g. watchbands, belts). Immediately flush with lukewarm, gently flowing water for 15-20 minutes. Call a Poison Centre or doctor. Double bag, seal, label and leave contaminated clothing, shoes and leather goods at the scene for safe disposal.
Eye Contact: Avoid direct contact. Wear chemical protective gloves if necessary. Immediately flush the contaminated eye(s) with lukewarm, gently flowing water for 15-20 minutes, while holding the eyelid(s) open. If a contact lens is present, DO NOT delay flushing or attempt to remove the lens. If irritation or pain persists, see a doctor.
Ingestion: Have victim rinse mouth with water. Immediately call a Poison Centre or doctor.
First Aid Comments: If exposed or concerned, see a doctor for medical advice. All first aid procedures should be periodically reviewed by a doctor familiar with the chemical and its conditions of use in the workplace.
Note to Physicians: This chemical forms carbon monoxide in the body.
Flammable Properties: Can ignite if strongly heated.
Suitable Extinguishing Media: Carbon dioxide, dry chemical powder, appropriate foam, water spray or fog. Foam manufacturers should be consulted for recommendations regarding types of foams and application rates.
Specific Hazards Arising from the Chemical: Forms corrosive chemicals on contact with water. Vapour may accumulate in hazardous amounts in low-lying areas especially inside confined spaces, resulting in a toxicity hazard. Closed containers may rupture violently when heated releasing contents. In a fire, the following hazardous materials may be generated: very toxic carbon monoxide, carbon dioxide; corrosive hydrogen chloride; corrosive chlorine; corrosive phosgene.
Personal Precautions: Evacuate the area immediately. Isolate the hazard area. Keep out unnecessary and unprotected personnel. Eliminate all ignition sources. Use grounded, explosion-proof equipment.
Methods for Containment and Clean-up: Do not touch spilled material. Stop or reduce leak if safe to do so. Ventilate the area to prevent the gas from accumulating, especially in confined spaces. Small spills or leaks: contain and soak up spill with absorbent that does not react with spilled product. Place used absorbent into suitable, covered, labelled containers for disposal. Contaminated absorbent poses the same hazard as the spilled product. Large spills or leaks: contact emergency services and manufacturer/supplier for advice.
Other Information: Contact supplier, local fire and emergency services for help.
Handling: Before handling, it is important that all engineering controls are operating and that protective equipment requirements and personal hygiene measures are being followed. Only trained personnel should work with this product. In event of a spill or leak, immediately put on escape-type respirator and exit the area. Immediately report leaks, spills or failures of the safety equipment (e.g. ventilation system). Avoid generating vapours or mists. Prevent accidental contact with incompatible chemicals. Do not use near welding operations or other high energy sources. Do not weld, cut or perform hot work on empty container until all traces of product have been removed.
Storage: Store in an area that is: cool, dry, well-ventilated, out of direct sunlight and away from heat and ignition sources, separate from incompatible materials. Keep amount in storage to a minimum. Store in the original, labelled, shipping container. Avoid bulk storage indoors.
ACGIH® TLV® - TWA: 50 ppm A3
Exposure Guideline Comments: TLV® = Threshold Limit Value. TWA = Time-Weighted Average. A3 = Animal carcinogen.
Engineering Controls: Do not allow product to accumulate in the air in work or storage areas, or in confined spaces. Use a local exhaust ventilation and enclosure, if necessary, to control amount in the air. Provide eyewash and safety shower if contact or splash hazard exists.
Eye/Face Protection: Wear chemical safety goggles. A face shield (with safety goggles) may also be necessary.
Skin Protection: Wear chemical protective clothing e.g. gloves, aprons, boots. Suitable materials include: polyvinyl alcohol, Silver Shield/4H® (PE/EVAL/PE), Trellchem® HPS, Trellchem® VPS, Tychem® Responder, Tychem® TK.
Respiratory Protection: Any detectable concentration: wear a NIOSH approved self-contained breathing apparatus (SCBA) or supplied air respirator. ESCAPE: gas mask with organic vapour canister, or escape type SCBA.
Document last updated on November 5, 2013