Extrapolations into such regions from lower temperatures will lack accuracy, however. Reliable data can be usefully plotted in the high temperature region even if it does exhibit some curvature. Some high-boiling point materials can show a small deviation from a straight line as low as 280â€Â☌ (approximately 550â€Â☏), depending on the individual sample or accuracy of the data. The charts provide improved linearity in both low kinematic viscosity and at temperatures up to 340â€Â☌ (approximately 650â€Â☏) or higher. The suggested range is thus between the cloud point at low temperatures and the initial boiling point at higher temperatures. Here is the official range claimed:ģ.1 Warning—The charts should be used only in that range in which the hydrocarbon or petroleum fluids are homogeneous liquids. Out of interest's sake, I might play with some of those numbers you suggested if I can get a few free minutes.ĪSTM D341 certainly claims validity for 150 C. When it comes to the KV150 business, that's where I really wonder. There can be problems with interpolations, but at least we do have a lot of KV40 and KV100 values in reality from data sheets and VOAs. Oh yes, I understand what you mean, but my issue isn't so much there.
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