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OSHA Permissible Exposure Limit (PEL)/American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV). Both values represent <br /> time-weighted average concentrations for an 8-hr. workday. <br /> ` Other Pertinent Limits: <br /> STEL = ACGIH or OSHA 15-minute Short-term Exposure Limit <br /> Ceiling = OSHA's maximum exposure concentration for which an employee shall not be exposed during any period without respiratory protection. <br /> LEL Lower explosive limit in air, % by volume <br /> IDLH = Immediately Dangerous to Life and Health, the concentration at which one could be exposed for 30 minutes without experiencing escape-impairing <br /> or irreversible health effects. <br /> ` "Dermal" - Indicates localized effects at point of exposure (e.g. dermatitis). <br /> "[Skin]" - Indicates the potential for exposure due to skin absorption as well as by inhalation of vapors. <br /> ° Carcinogen <br /> Yes• <br /> U.S. EPA Classification A or 81 <br /> A - Confirmed human carcinogen (sufficient evidence of carcinogenicity in humans) <br /> 81= Probably human carcinogen (sufficient animal evidence with limited human evidence) <br /> us ct: <br /> U.S. EPA Classification 82 <br /> B2= Probably human carcinogen (sufficient animal evidence with inadequate or lack of human data) <br /> Experimental• <br /> U.S. EPA Classification C <br /> C = Possible human carcinogen (limited evidence of carcinogenicity in animate and inadequate or lack of human data) <br /> No: <br /> U.S. EPA Classification D or E <br /> D = Not classified (inadequate or no evidence) <br /> E - Evidence of noncarcinogenicity <br /> 14 <br />