Those who use the TLVs MUST consult the latest Documentation to ensure that they understand the basis for the TLV and the information used in its development. The amount and quality of the information that is available for each chemical substance varies over time.

Chemical substances with equivalent TLVs (i.e., same numerical values) cannot be assumed to have similar toxicologic effects or similar biologic potency. In this book, there are columns listing the TLVs for each chemical substance (that is, airborne concentrations in parts per million [ppm] or milligrams per cubic meter [mg/m3]) and critical effects produced by the chemical substance. These critical effects form the basis of the TLV.




Chemistry Form 5 Notes Pdf Download