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01.16 Clays & raw materials :: Raw materials Increases glaze viscosity, firing range and resistance to crystallisation Useful in the production of textured bodies and brown-black glazes.
More fusible than feldspar. It gives a dark brown glaze at 1250˚C Comparatively white firing clay, very plastic Devon Ball Clay A Devon Ball Clay, more plastic than P3301, high unfired strength, firing A fast casting Ball Clay used in all types of applications, but primarily A Dorset Ball Clay. Its special feature is a high iron content, high strength – useful in the production of warm coloured textured bodies A Devon Ball Clay, giving good plasticity with medium strength and a low Used in casting slips (up to 0.5%) to prevent “scumming” due to the presence of soluble salts. A flux in high temperature glazes it also produces matt andsemi-matt surfaces at earthenware temperatures Extremely plastic colloidal clay, used in bodies (up to 5%) to increaseplasticity, and in glaze (up to 2%) as a suspending agent Essential constituent of Bone China, imparting the characteristic translucency.
Also used as a secondary flux in glazes giving a milky quality Used as a flocculent (0.05% addition) or in conjunction with Bentonite as a suspending agent for glazes A Cornish kaolin, white firing, good strength and good rheological properties A Cornish kaolin. Very white firing and high strength A Cornish Kaolin. White firing, good strength. Performs well in A good general purpose kaolin sufficing most applications A naturally occurring source of Boron. A powerful primary or secondary flux in glazes. It intensifies the effect of colouring oxides and increases crazeresistance of glazes. P2954 (Calcium Borate Frit) may be used as an alternative An alternative to feldspar as a high temperature flux. This partially decomposed granite is used widely as a flux in bodies. Mineral flux couldbe used as an alternative Natural source of calcium and magnesium Useful as a secondary flux in Stoneware glazes and bodies Norwegian sourced. The strongest flux, more suitable for low temperature Norwegian sourced. Principal body flux having a wide vitrification range.
It can also be used as flux in mainly stoneware glazes Finnish sourced. A medium strength flux sufficing both body and glaze Used in glazes and in bodies as a source of calcined silica Fireclay based, pre-fired and crushed to mesh size 5-30s. Used as a grog in bodies Fireclay based, pre-fired and crushed to mesh size 5mm-dust used as a grogin bodies where tight control of grog size is not required Used to ‘seed’ crystalline glazes (up to 1%) Purest way of introducing Li2O to glaze recipes Cornish sourced. A high temperature calcined kaolin used to raise maturing temperature of glazes. Reduces crawling tendency in glazeswhich have a high clay content Cornish sourced. A medium to fine sized grog for white bodies Cornish sourced. Use as a grog to introduce openness of texture in bodies Cornish sourced coarser than P3358 and best suited as an additionto Raku and modelling bodies to introduce a more open texture

Source: http://www.we.no/PDF/Potterycrafts/Potterycrafts-clays%2016.pdf