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"PENDIX C <br /> Definition of Hazard Evaluation Guidelines <br /> Kazard'. Airborne Contaminants <br /> Guideline Explanation <br /> Threshold Limit value The time-weighted average concen- <br /> Time-Weighted Average tration for a normal 8-hour work <br /> (TLV-TWA) day and a 40-hour work week, to <br /> which nearly all workers may be <br /> repeatedly exposed without <br /> adverse effect. <br /> Permissible Exposure Limit Time-weighted average concentra- <br /> (PEL) tions similar to (and in many <br /> cases derived from) the Threshold <br /> Limit Values. <br /> Immediately Dangerovs to 11IDLH11 or 1°Immediately dangerous <br /> Life and Health to life or health" means any <br /> (IDLH) atmospheric condition that poses <br /> an immediate threat to life, or <br /> which is likely to result in <br /> acute or immediate severe health <br /> effects. This includes oxygen <br /> deficiency conditions. <br /> Hazards Explosion <br /> Guideline EXRlanation <br /> Loper 1xpA6ribelb*m*bich propagation oThe afinimu.widdnaettrztnaniaftML) <br /> presence of an ignition source. <br /> Upper Explosive Limit The maximum concentration of <br /> (UEL) vapor in air above which <br /> propagation of a flame will not <br /> occur in the presence of an <br /> igiition source. <br /> Hazard: Pire <br /> Guldeline Explanation <br /> Flash Point The lowest temperature at which <br /> (flash p) the vapor of a combustiblA liquid <br /> can be made to ignite momC,ntarily <br /> in air, <br />