Threshold Limit Value 05
Threshold Limit Value 05 : Airborne concentration of a material to which nearly all persons can be exposed day after day, without adverse effects. TLV's are expressed in 3 ways: (1) TLV-C: Ceiling limit, concentration that should not be exceeded even instantaneously. (2) TLV-STEL: Short term exposure limit, maximum concentration for a continuous 15-minute exposure period. (3) TLV-TWA: Time-weighted average, concentration for a normal 8-hour work day or 40-hour work week