Surface Tension

Surface tension is of concern in ceramics because the behaviour of a molten glaze is affected by this phenomenon. Glazes with low surface tension spread over the body surface and run into small cracks and valleys. Glazes with high surface tension resist spreading out and often crawl into islands of glaze surrounded by bare patches of body. Surface tension is determined by chemistry and as expected, oxides that matte and opacify glazes increase surface tension (in this order Al2O3, MgO, ZrO, CaO, SnO). Strong fluxes reduces it (in this order: Na2O3, K2O, Li2O, B2O3). Intermediates are ones like ZnO, SrO, TiO2).

In Bound Links

• (Troubles) Glaze Crawling
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