Usually it is desirable to run rotary. washers at as low a rotation speed and. as ... A method is developed that permits an analysis of the performance of barometric legs as applied to vacuum filters.
8/08/2007 · Vacuum filtration is only suitable for funnels with a flat surface! The filter paper has to cover all holes in the bottom of the funnel (Hirsch or Büchner, both made from procelain) and does not extend up the sides. Otherwise a significant part of your solid will 'run through' the filter paper.