Fluidity, Melt Fluidity
Molten glazes exhibit viscosity, that is, a tendency to run or to stay put. This is why matte glazes are referred to as stiff or viscous. The degree of fluidity is often compared using flow testers that have reservoir of glaze feeding onto an inclined runway. Glaze melt fluidity relates closely to a variety of problems like pinholing, crawling, gloss, blistering, etc. Logically, glazes for vertical surfaces will be more viscous that tile glazes, for example, which are applied to horizontal surfaces. Molten glaze viscosity can be understood in terms of molecular silicate chains (which also link across to other chains). The chemistry of the melt determines the rigidity of the structure and therefore the viscosity of the melt. The Potter's dictionary has a very good discussion with diagrams of this under the term 'viscosity'. Out Bound Links
In Bound Links
Pictures
Example of how iron turns to a flux in reduction firing and makes the glaze melt much more fluid.
Example of a cone 10 transparent that is running severely on a flow tester, but does run on actual ware. The glaze is cutlery marking (therefore lacking hardness). This, the running and likely leaching are due to extremely low SiO2, Al2O3 content.
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