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Operations Manual of the Threshold Limit Values for Chemical Substances. (TLV®-CS) Committee, accessible online at: acgih.org/TLV/OPSManual.pdf.Threshold Limit Values (TLVs®) and Biological Exposure Indices (BEIs®) are determinations made by a voluntary body of independent knowledgeable individuals. ACGIH® will not oppose their use in this manner, if the use of TLVs® Proposed BEIs® that appeared on the 2018 NIC are adopted for the follow-. PDF | The American Conference of Governmental and Industrial Hygienists (ACGIH®) From 2008 to 2018, ACGIH established or reviewed TLVs for 145 different