1. 
   TLV-STEL
   15 minutes Short Term Exposure Limit which should not be exceeded at any time during the working day and not be repeated more than four times per day. STELs should exceed three times the TWA for no more than a total of thirty minutes and never more tha
   Found op http://www.chemicalglossary.net/definition/1597-TLV/STEL
   
   
2. 
   TLV/STEL
   15 minutes 'Short Term Exposure Limit' which should not be exceeded at any time during the working day and not be repeated more than four times per day. STELs should exceed three times the TWA for no more than a total of thirty minutes and never more than five times the TWA even if the TWA is never...
   Found op http://www.amgas.com/gloss.htm
   
   

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