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The toxicokinetics of 2,2’oxydiethanol and of propane-1, 2-diol and its propoxylated oligomers have been examined in Illing and Barrat (2007 revised 2009). Propane-1, 2-diol is both a core substance (initiator) and a repeating unit. The information on the toxicokinetics of 2,2’-oxydipropanol, propoxylated, 1-4.5 mol (the NLP polyol) is based on the information for ethane-1,2-diol and its dimer (2,2’-oxydiethanol) and trimer and propane-1,2-diol and its dimer (1 mol propoxylated propane-1,2-diol) and trimer (2 mol propoxylated propane-1,2-diol). Oxydiethanol has two hydroxy groups, thus oligomers are considered to be core substances with chains of between one and three repeating units. Commercial material contains a range of propoxylated oxydiethanols.