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WELDING FUME GUIDES AND INFORMATION
REVISED TLV FOR MANGANESE
The American Conference of Governmental Industrial Hygienists (ACGIH) advised in February 2013 that it had adopted the proposed change to the Threshold Limit Value (TLV) for manganese. The change was published in the 2013 Edition of its TLVs and Biological Exposure Indices (BEIs) publication.
TLV FOR CHROMIUM COMPOUNDS
The American Conference of Governmental Industrial Hygienists (ACGIH) advised in March of 2018 that it had adopted its proposed change to the Threshold Limit Values (TLVs) for Chromium Compounds. The change was published in the 2018 Edition of its TLVs and Biological Exposure Indices (BEIs) publication. The new TLV is 0.0002 mg/m3 for inhalable hexavalent chromium compounds, representing a 250-fold reduction from the previous 0.05 mg/m3 TLV. The new TLV for chromium compounds includes a .003 mg/m3 limit for inhalable chromium (III) compounds, which is a 167-fold reduction from the previous 0.5 mg/m3 TLV. These changes are not specific to the welding industry, but may impact welding and its allied processes that contain chromium compounds and/or may contain chromium compounds in the fume.
The ACGIH’s recent change in the chromium compounds TLVs appears to be based primarily on animal studies for the hexavalent chromium TLV changes, and studies of Finnish chromium workers for the chromium (III) compounds TLV change.
The ACGIH acknowledges that its TLVs are not consensus standards and do not take into account economic or technical feasibility issues. The ACGIH recognizes that that some governmental entities may utilize its TLVs in adopting standards.
Where exposures are assessed to be over the TLV, many approaches can be considered in the workplace for reducing exposure levels to contaminants to levels below the TLV, including these new TLVs related to chromium compounds.
PUBLICATIONS FROM AMERICAN WELDING SOCIETY
Safety and Health Fact Sheets
Safety in Welding, Cutting and Allied Processes Document - AWS/ANSI Z49.1
Browse All Publications from AWS