This webinar will focus on the Notations recommended by the Threshold Limit Values for Chemical Substances (TLV®-CS) Committee. This webinar will aim to give attendees an improved understanding of Skin, DSEN, RSEN, OTO notations and the Carcinogen Classifications and how they can use them to optimize their exposure control programs. Following a brief overview, the purpose of special notations will be discussed, which is to highlight toxicity endpoints that set certain chemical substances apart and to alert the practicing industrial hygienist that special considerations need to be given to these materials to ensure adequate protection of workers. For each notation, background information, types of data and specific criteria will be described to help the attendee understand how the committee assigns these notations and classifications. Specific examples will be used throughout the webinar to illustrate how the various notations are assigned and how these should be interpreted and applied by the practicing industrial hygienist.