conditions or concentration under which the effect takes place. SHORT-TERM EXPOSURE LIMIT – Represented as STEL or TLV-STEL, this is the maximum concentration to which workers can be exposed for a short period of time for only four times throughout the day with at least one hour between exposures. Also the daily TLV-TWA must not be exceeded. SENSITIZER – A substance that may cause no reaction in a person during initial exposures, but afterwards, further exposures will cause an allergic response to the substance. PERMISSIBLE EXPOSURE LIMIT – An exposure, inhalation or dermal permissible exposure limit specified in 8CCR5155. PELs may be either a time-weighted average exposure limit , a 15-minute short-term limit , or a ceiling . OXIDIZER – Is a substance that gives up oxygen easily to stimulate combustion of organic material. MUTAGEN – Anything that can cause a change in the genetic material of a living cell. INCOMPATIBLE – The term applies to two substances to indicate that one material cannot be mixed with the other without the possibility of a
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