If engineering controls and work practices are not effective in controlling exposure to this material, then wear suitable personal protective equipment including approved respiratory protection. Have appropriate equipment available for use in emergencies such as spills or fire.

If respiratory protection is required, institute a complete respiratory protection program including selection, fit testing, training, maintenance and inspection. Refer to the CSA Standard Z94.4-93, "Selection, Use and Care of Respirators," available from the Canadian Standards Association, Rexdale, Ontario, M9W 1R3.

RESPIRATORY PROTECTION GUIDELINES:

NIOSH RECOMMENDATIONS FOR 2-BUTANONE CONCENTRATIONS IN AIR:

UP TO 3000 ppm: SAR operated in a continuous-flow mode; or powered air-purifying respirator with organic vapour cartridge(s); or full-piece chemical cartridge respirator with organic vapour cartridge(s); or gas mask with organic vapour canister; or full-facepiece SCBA; or full-facepiece SAR.

EMERGENCY OR PLANNED ENTRY INTO UNKNOWN CONCENTRATIONS OR IDLH CONDITIONS: Positive pressure, full-facepiece SCBA; or positive pressure, full-facepiece

SAR with an auxiliary positive pressure SCBA.

ESCAPE: Gas mask with organic vapour canister; or escape-type SCBA.

NOTE: Substance causes eye irritation or damage; eye protection needed.

NOTE: The IDLH concentration for 2-butanone is 3000 ppm.

NOTE: The purpose of establishing an IDLH value is to ensure that the worker can escape from a given contaminated environment in the event of failure of the most protective respiratory protection equipment. In the event of failure of respirator protective equipment every effort should be made to exit immediately.

Recommendations apply only to NIOSH approved respirators. Air-purifying respirators do not protect against oxygen-deficient atmospheres. The respirator use limitations specified by the approving agency and the manufacturer must be observed.

ABBREVIATIONS: SAR = supplied-air respirator; SCBA = self-contained breathing apparatus. IDLH = Immediately Dangerous to Life or Health.

Chemical safety goggles. A face shield may also be necessary.

Chemical resistant gloves, coveralls, boots, and/or other resistant protective clothing. Have a safety shower/eye-wash fountain readily available in the immediate work area.

Guidelines for methyl ethyl ketone:

RECOMMENDED (resistance to breakthrough longer than 8 hours): Butyl rubber, Teflon(TM), 4H(TM) (polyethylene/ethylene vinyl alcohol), Barricade(TM), CPF 3(TM), Tychem 10000(TM).

RECOMMENDED (resistance to breakthrough longer than 4 hours); Responder(TM).

NOT RECOMMENDED for use (resistance to breakthrough less than 1 hour): Natural rubber, neoprene, nitrile rubber, polyethylene, polyvinyl chloride, Viton(TM), Saranex(TM), polyvinyl alcohol.

Recommendations are valid for permeation rates reaching 0.1 µg/cm²/min or 1 mg/m²/min and over. Resistance of specific materials can vary from product to product. Breakthrough times are obtained under conditions of continuous contact, generally at room temperature. Evaluate resistance under conditions of use and maintain clothing carefully.

Reference: Forsberg, K., et al. Quick selection guide to chemical protective clothing. 3rd edition. Van Nostrand Reinhold, 1997.

Remove contaminated clothing promptly. Keep contaminated clothing in closed containers. Discard or launder before rewearing. Inform laundry personnel of contaminant's hazards.

Do not smoke, eat or drink in work areas. Wash hands thoroughly after handling this material. Maintain good housekeeping.