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1 ' • Ceiling Evaluation • PERSONAL OAOTECTIVE EQUIPMENT Measurements to determine employee ceiling exposure are best taken during periods of maximum expected Employees should be provided with and required to airborne concentrations of methylene chloride. Each use impervious clothing,gloves, face shields(eight-inch measurement should consist of a fifteen (15) minute minimum), and other appropriate protective clothing sample or series of consecutive samples totalling fifteen necessary to prevent repeated or prolonged skin contact (15) minutes in the employee's breathing zone (air that with liquid methylene chloride. would most nearly represent that inhaled by the em- Non-impervious clothing which becomes wet with ployee). A minimum of three (3) measurements should liquid methylene chloride should be removed promptly be taken on one work shift and the highest of all and not reworn until the methylene chloride is removed measurements taken is an estimate of the employee's from the clothing. exposure. • Employees should be provided with and required to • Peak Above Ceiling Evaluation use splash-proof safety goggles where liquid methylene Measurements to determine employee peak exposure should be taken during periods of maximum expected chloride may contact the eyes. airborne concentration of methylene chloride. Each SANITATION measurement should consist of a 30-minute sample or a series of consecutive samples totalling 30 minutes in the employee's breathing zone (air that would most nearly ' Skin that becomes wet with liquid methylene chlo- represent that inhaled by the employee). A minimum of ride should be promptly washed or showered with soap three measurements should be taken pn one work shift or mild detergent and water to remove any methylene and the highest of all measurements taken is an estimate chloride. of the employee's exposure. • Method COMMON OPERATIONS AND CONTROLS Sampling and analyses may be performed by collection The following list includes some common operations in of vapors using an adsorption tube with subsequent desorption with carbon disulfide and gas chromatogra- which exposure to methylene chloride may occur and phic analysis. Also, detector tubes certified by NIOSH control methods which may be effective in each case: under 42 CFR Part 84 or other direct-reading devices Operation Controls j calibrated to measure methylene chloride may be used. An analytical method for methylene chloride is in the Use as a solvent in General dilution NIOSH Manual of Analytical Methods, 2nd Ed., Vol. 3, paint and varnish ventilation; local 1977, available from the Government Printing Office, removers; manufacture exhaust ventilation; Washington, D.C. 20402 (GPO No. 017-033-00261-4). of aerosols; cold personal protective cleaning and ultrasonic equipment cleaning; and as an RESPIRATORS extraction solvent for foods and furniture • Good industrial hygiene practices recommend that processing engineering controls be used to reduce environmental concentrations to the permissible exposure level. How- Use as a cooling Process enclosure; ever, there are some exceptions where respirators may solvent in manufacture local exhaust ventilation be used to control exposure. Respirators may be used of cellulose acetate; in when engineering and work practice controls are not organic synthesis; and technically feasible, when such controls are in the in plastics processing process of being installed,or when they fail and need to Use as a solvent in Process enclosure; be supplemented. Respirators may also be used for operations which require entry into tanks or closed vapor degreasing of local exhaust ventilation vessels, and in emergency situations. If the use of thermal switches and respirators is necessary, the only respirators permitted thermometers _ are those that have been approved by the Mine Safety Use as a secondary General dilution and Health Administration (formerly Mining Enforce- refrigerant in air ventilation; local ment and Safety Administration) or by the National conditioning and exhaust ventilation; Institute for Occupational Safety and Health. scientific testing personal protective • In addition to respirator selection,a complete respira- quipment tory protection program should be instituted which FaIn4 includes regular training, maintenance, inspection, cleaning,and evaluation. SEP 6 1985 September 1978 ENVIROMENTAL HEALTH Methylene Chloride 3 F ERw1I i/SERVICES