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DEFIKILTIon OF RUNW <br /> NVALVATION, <br /> RANARDs Airborne Contaminants <br /> i enation <br /> Threshold Limit value The time-weighted average <br /> Time-Weighted Average concentration for abnormal 8-hour <br /> (TLV-TWA) work day and a 40-hour work week, <br /> to which nearly all workers may be <br /> repeatedly exposed without adverse <br /> Permissible Exposure Limit effect. <br /> (PEL) Time-weighted average <br /> concentrations similar to (and in <br /> Immediately Dangerous to many cases derived from) the <br /> Life and Health Threshold Limit values> <br /> 11IDLH11 or "immediately dangerous to <br /> life or health,} means any <br /> atmospheric condition that poses an <br /> immediate threat to life, or which <br /> is likely to result in acute or <br /> RAZARN Explosion immediate severe health effects. <br /> This includes oxygen deficiency <br /> e . <br /> conditions. <br /> Lower Explosive Limit 101A ataon <br /> (LEL) The minimum concentration of vapor <br /> in air below which propagation of a <br /> flame will no occur in the presence <br /> Upper Explosive Limit of an ignition source. <br /> (UEL) The maximum concentration of vapor <br /> in air above which propagation of a <br /> flame will not occur in the <br /> RAZARDi Fire presence of an ignition source. <br /> �u�elin� �xnlanatidn <br /> Flash Point <br /> (flash p) The lowest temperature at which the <br /> vapor of a combustible liquid can <br /> be made to ignite momentarily in <br /> air. <br /> 1 <br />