GASTEC CORPORATION - For all types of gas and vapour




What are TWA and STEL?


TWA stands for Time Weight Average. This in reference to dosages of toxic gas you may encounter in the work place. It is based on an 8 hour day/ 40 hour work week. TWA is a term established by the American Conference of Governmental Industrial Hygienists (ACGIH). STEL stands for Short Term Exposure Limit. This is the average amount of gas you can be exposed to in a 15 minute period with no long term health effects. This may occur 4 times a day. STEL is a term established by the ACGIH.


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