1 : a time-weighted average exposure limit (typically 8 hours) or a ceiling exposure limit for employees to any material listed in Occupational Safety and Health Administration (OSHA) Regulation 29 CFR, Air Contaminants. [SEMATECH] 2 : the maximum permitted eight-hour time-weighted average concentration of an airborne contaminant. The maximum permitted time-weighted average exposures to be used are those published in 29 CFR 1910, Subpart Z. [SEMI S2-93]
Search the Dictionary for More Terms