Conversion coating definition

A soluhon explored to definitely eliminate the problem of interachons with free silanol groups was the use of non-silica based stahonary phases. Many studies recently reviewed [9] were conducted on this class of stahonary phases to test their usefulness for UpophiUcity prediction. A few of these phases including polybutadiene-coated alumina [4] and octadecyl-bonded alumina show intereshng results. Conversely, several of them show poor correlahons or correlahons not better than those obtained on ODS stahonary phases between the retenhon parameter and log Pod-... 

In the USA a mass per volume (Ibs/gal) definition is used and there is no easy direct correlation or conversion between the two. The density of the coating has a significant effect. White basecoats have a much higher density than a clear varnish. The solids are measured at 110°C for 60 minutes in accordance with the standard ASTM test. The water content can be measured by either a Karl Fischer titriometric technique or by gas chromatography using an ion flame detector. Values from different techniques may well differ. 

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