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Threshold limit value
Also known simply as limit or TLV, this value represents the minimum physical amount which has to be added to a system in order to initiate a certain reaction or phenomenon. The limit for the concentration of the vapor from a solder wire with a flux core is usually around 0.1 mg/m3. D ecomposition products are measured on the basis of formal dehyde, but also include acetone , methyl alcohol, aliphatic aldehydes, carbonic acid gas, carbon monoxide, methane, ethane, abietic acid, diterpenic acid, etc. See also Workplace exposure limit .