TLV 16
TLV 16 : Threshold Limit Value: A term used by ACGIH to express the airborne concentration of a material to which nearly all persons can be exposed day after day, without adverse effects. ACGIH expresses TLVs in three ways: (1) TWA: The allowable Time Weighted Average concentration for a normal eight-hour day or forty-hour work week. (2) STEL: The Short-Term Exposure Limit or maximum concentration for a continuous fifteen-minute exposure period (maximum of four such periods per day, with at least 60 minutes between exposure periods, provided that the daily TLV-TWA is not exceeded). (3) CEL: The Ceiling Exposure Limit, the concentration that should not be exceeded, even instantaneously
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