|Monthly Tech-Tip |
Nothing compares the fired properties of frits as well as a melt-flow comparison. Remarkably, each frit has such a unique melting behaviour that it is possible to identify them and determine if two are similar (without knowing the chemistry). But frits need a binder to make them plastic-formable. I mix 50g of frit with 1.5g of VeeGum (or 100g/3g) then stir the powder into 40g of water in a cup. That produces a consistency that is easy to stir smooth (using a teaspoon) but is still fluid enough to level out on a plaster bat (for dewatering to plastic consistency). The 3% VeeGum is not enough to affect the melting behaviour, but it makes them pretty workable (however each frit does exhibit different tactile characteristics). I roll them into 12g (wet) balls, then dry them. They fit nicely into the reservoir for my GBMF test.
Comparing the Melt Fluidity of 16 Frits
Frits are used in ceramic glazes for a wide range of reasons. They are man-made glass powders of controlled chemistry with many advantages over raw materials.
A clay of incredibly small particle size. It has the highest plasticity of any known clay and acts as a suspending and gelling in slurries.