Measuring slip viscosity using a paint-measuring device

Tuesday 15th July 2014

A insight-live.com/picture/1094">Ford Cup is being using to measure the viscosity of a casting clip. These are available at paint supply stores. This is a #4 (4.25mm opening), it holds 100ml and drains water in 10 seconds. This casting slip has a specific gravity of 1.79. Having made it many times, our experience indicates 40-seconds as a drain target (after high energy mixing). In production situations, the seconds-value this test produces enables an audit-trail for quality control and problem solving. When first mixing a slurry, under-deflocculating and eye-balling the viscosity is typical, during that period the slurry gels while draining and Ford cup measurements are not valid. When the mixing process has been perfected and viscosity stabilized the Ford Cup becomes practical.

Pages that reference this post in the Digitalfire Reference Library:

Low Budget Testing of the Raw and Fired Properties of a Glaze, Understanding the Deflocculation Process in Slip Casting, Viscosity, Slip Casting, Rheology, Deflocculation

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