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-� APPENDIX C <br /> EXPLANATION OF HAZARD EVALUATION GUIDELINES <br /> Guideline Explanation <br /> Hazard: + Airborne Contaminants <br /> Threshold Limit Value The time-weighted average con- <br /> Time-Weighted Average centration for a normal 8-hour <br /> (TLV-TWA) work day and a 40-hour work <br /> week, to which nearly all <br /> workers may be repeatedly <br /> exposed without adverse <br /> effect. <br /> Permissible Exposure Limit Time-weighted average concen- <br /> (PEL) trations similar to (and in <br /> many cases derived from) the <br /> threshold limit values. <br /> Immediately Dangerous The maximum level from which a <br /> to Life or Health (IDLH) worker could escape without <br /> any escape-impairing systems <br /> or any irreversible health <br /> effects. <br /> Hazard: Explosion <br /> Lower Explosive Limit The minimum concentration of <br /> (LEL) vapor in air below which <br /> propagation of a flame will <br /> not occur in the presence of <br /> an ignition source. <br /> Upper Explosive Limit The maximum concentration of <br /> (UEL) vapor in air above which <br /> propagation of a flame will <br /> not occur in the presence of <br /> an ignition source. <br /> Hazard: Fire <br /> Flash Point The lowest temperature at <br /> (flash p) which the vapor of a com- <br /> bustible liquid can be made to <br /> ignite momentarily in air. <br /> TECHNOLOGY,INC. <br />