Metal fabricating companies that seek to provide the safest work environments for their employees might be interested to know that the job might get a little harder in the welding department. The leading industrial health and safety organization that regularly issues guidance for certain toxic compounds is recommending a dramatic reduction in manganese fume exposure.
The American Conference of Governmental Industrial Hygienists (ACGIH) has recommended a 10-fold reduction in the time weighted average (over eight hours) threshold limit value for respirable manganese particulate. The association reduced the TLV-TWA limit of 0.2 mg/m3 to 0.02 mg/m3. In other words, a person should not breathe in more than 0.02 mg/m3 of manganese over an eight-hour work period. (more...)