Powdered Materials

Feldspars are major fluxes in clay bodies (up to 15%) and the principal materials and fluxes in high temperature stoneware glazes (up to 50%). They are low temperature secondary fluxes and can be regarded as natural frits.

Feldspars are major fluxes in clay bodies (up to 15%) and the principal materials and fluxes in high temperature stoneware glazes (up to 50%). They are low temperature secondary fluxes and can be regarded as natural frits.

Leadless Calcium Borosilicate Frit. 1040c - 1100c

Leadless Calcium Borosilicate Frit. 1040c - 1100c RAKU AND EARTHENWARE GLAZES22.7kg = 50lb

Lead Bi-Silicate Frit. low solubility 950c - 1050c (Replaces 4364, 4064)

High Alkaline,  Low Temperature Frit

Leadless Soft Sodium Borosilicate Frit. COPPER BLUE AND MANGANESE PURPLE GLAZES. ALSO FOR CRACKLE GLAZES 1000c - 1060c

Dense Zircon White Leadless Frit. 1040c - 1100c

A calcium borate containing the minerals colemanite and ulexite.22.7kg = 50lb GERSTLEY BORATE NOW DISCONTINUED REPLACEMENT CALL GILLESPIE BORATE NOW AVAILABLE

Gillespie Borate provides the same minerals to the glaze as Gerstley Borate creating the same glaze activity, texture and effects. As a carefully manufactured product it provides consistency which was not the case with the variable Gerstley Borate. Tests have been done in glazes replacing Gerstley Borate on a 1 to 1 basis with Gillespie Borate as suggested by the manufacturer. In some cases the results were very similar. In other cases the Gillespie Borate created more melt making certain glazes run. We strongly suggest you carefully test this product in your own circumstances.

Grogs are used to produce openness of texture in clay bodies, aid drying and reduce shrinkage and warping (usually up to 20%). The texture is modified according to the mesh size of the grog used.

Grogs are used to produce openness of texture in clay bodies, aid drying and reduce shrinkage and warping (usually up to 20%). The texture is modified according to the mesh size of the grog used.

ROTEX grog is a calcined grog, also know as a Chamotte, produced from high quality ore deposits. Provides excellent thermal resistance, green strength and reduced shrinkage.

Hard and strong with high water absorption resistance. Dry compressive strength of 10,000 psi. Works well in plaster and most flexible moulding compounds. Used in high-quality art novelty and statuary castings. Extremely fine detail duplication. Low viscosity slurry for filling multiple moulds at one time. - 22.7kg = 50lb

Having a higher iron content than natural red iron oxide, it produces darker shades of colour (4-8%). Ferrous oxide.

Red Iron oxide which can be unstable and inconsistent in its results. Ferric oxide. Iron oxides generally give a wide range of honey yellow, brownish reds, browns and blacks and are extremely popular colouring pigments for glazes and bodies. 3-8% gives yellows with yellow ochre, browns with haematite, red-browns with red synthetic, greys with iron chromate and black with magnetite or ferrous oxide. Speckled effects can be obtained with crocus martis. Warm colours obtained in lead glazes and cooler ones in lead free and alkaline glazes especially. Mottled creams can be obtained in the presence of tin. The final colour obtained with iron oxide varies with the type of glaze, firing temperature and kiln atmosphere. Iron oxide is also an active flux in glazes and even in small amounts will make a glaze noticeably more fluid. Synthetic red is very fine and produces more even shades from honey to dark brown (2-10%).

A pure chemically processed iron which gives yellow to brown colours (3-8%). Iron hydroxide.