Materials

Ferro Frit 3110

F3110

Frit 3110 is a sodium borosilicate frit, high in soda. A frit is a glass that has been melted and ground back to powder, so fluxes that would dissolve in the glaze water stay in the glaze. This one raises thermal expansion a long way.

Ferro Frit 3124

F3124

Frit 3124 is a calcium borosilicate frit. Soda, calcium, boron, alumina and silica are melted to a glass and ground back to powder, so fluxes that would dissolve in the glaze water stay in the glaze. It contains its own alumina, and on its own it is close to a balanced glaze.

Ferro Frit 3134

F3134

Frit 3134 is a high boron calcium borosilicate frit that contains low amounts of alumina. It melts at a low temperature and runs, so it works best in a recipe with enough clay to supply the alumina.

Ferro Frit 3195

F3195

Frit 3195 is a calcium borosilicate frit with a lot of boron and enough alumina to stand on its own. With only kaolin added it makes a glossy low fire glaze.

Ferro Frit 3249

F3249

Frit 3249 is a magnesia borosilicate frit with very low thermal expansion. A small addition is a standard way to stop a glaze crazing, though it melts much hotter than a low fire frit.

Fluorspar

FLOU

Fluorspar is calcium fluoride, the mineral fluorite, ground to a powder. It is used as a source of calcium and as a strong flux where a more fusible melt is wanted, and above about 1000°C the fluorine in it leaves as gas.

Flint Silica

FLSI

Flint silica is ground quartz. It is the material that forms glass in a glaze, and in a clay body it is the filler that controls how much the fired piece expands and contracts.

G200 Feldspar

G2FE

G200 is a potash feldspar, so potassium is its main flux. Like any feldspar it supplies alumina and silica along with the alkalis, and it is used both in glazes and in clay bodies.

Gillespie Borate

GIBO

Gillespie Borate is a proportioned blend of borate minerals, mainly ulexite with a little colemanite. It supplies boron, which begins to melt well below the other common glaze fluxes, so it is used in low and mid range recipes.

Goldart

GOLD

Cedar Heights Gold Art Clay is a highly plastic, fine-grained stoneware clay used as a primary component in ceramic bodies. Dry-milled to 200 mesh, it offers smooth working properties, a broad firing range, and light buff-to-cream fired colours that can develop attractive effects in reduction and wood firing.

Grog Coarse (STKO)

GRCO

Coarse Grog is the largest of the three grog grades we make, with grains big enough to see and to feel between the fingers. Of the three it does the most to support a heavy form and to let a thick wall dry evenly.

Grolleg Kaolin

GRKA

Grolleg is a kaolin that is very low in titania, the impurity that does most to stop a thin porcelain wall firing translucent. It also contains some residual mica, which adds a little potassium.

Grog Medium

GRME

Medium Grog sits between the coarse and fine grades, and it is felt as an even grain instead of separate grits. It opens a body and reduces its shrinkage, without the harsh surface texture the coarse grade leaves.

Gum Solution

GUM

Gum Solution is a cellulose gum already dissolved in water, ready to pour and measure. It thickens a glaze slurry, and once the water has left it leaves a film that protects the dried coat from dusting or chipping.

CMC Gum

GUMC

Gum CMC is a cellulose gum that thickens a glaze and binds the dried layer to the pot. It makes a glaze brushable and lets a second coat be applied without lifting the first.

Plainsman Halloysite

HEKA

Plainsman Halloysite is a halloysite bearing kaolin type clay ground by Plainsman. It is cream coloured raw, fires light, and is unusually workable for a kaolin, and it is valued for the brown and red flashing it develops on bare surfaces in wood firing.