TY - JOUR A1 - Krösche, C. A1 - Malow, Marcus A1 - Budde, K. T1 - False-Positive Results of UN Test O.2 Liquid Oxidizer Test of Polychlorosilanes T2 - Journal of Loss Prevention in the Process Industries N2 - According to UN Test O.2, surprisingly, the polychlorosilanes hexachlorodisilane (HCDS), octachlorotrisilane (OCTS) and decachlorotetrasilane (DCTS) formally fulfill the criteria of the “test for oxidizing liquids”. This result is in contrast to the properties of polychlorosilanes that are described in the literature and those we have experienced in our own production. By investigating the reaction products from the UN O.2 test reactor, using IR, Raman and XPS spectroscopy, it was shown that the results are not due to oxidizing properties of HCDS, OCTS or DCTS, but are caused by the specified test substance cellulose. To our knowledge, this is the very first substance class in which the reference substance oxidizes the test sample, instead of vice versa. This represents an important limitation of the internationally used UN Test O.2 for this substance class. The cause for this false-positive result is the known high degree of affinity of oxygen to silicon. It is shown that the correctly executed UN Test O.2 produces false-positive results and that the polychlorosilanes do not have an oxidizing effect and, therefore, do not have to be classified as “oxidizing substances”. PB - Elsevier Ltd. KW - Polychlorosilanes KW - UN Test O.2 KW - Hexachlorodisilane KW - Octachlortrisilane KW - Decachlorotetrasilane KW - False-positive results PY - 2020 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/52398 AN - OPUS4-52398 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-523989 VL - 70 SP - 104434 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany