This range of materials covers the requirements of both
the studio potter and schools to make up bodies and glazes. Some of the materials could be poisonous if not used in the
prescribed manner. All raw materials considered to be potentially hazardous are labeled
accordingly. We are happy to provided Material Safety Data Sheets for
any of these products. Care should taken when handling all raw materials, with strict
attention to hygiene and protective apparel requirements.
BA10 - ALUMINA CALCINED 100 MESH
When used as a direct source of alumina in glazes has the
effect of increasing glaze viscosity, firing range and resistance to crystallization.
Crawling tendency of glazes with high clay content is reduced by introducing
alumina as part replacement for clay. A melting point of 2050°C makes alumina
useful in batt washes, etc. Available in 1 kg, 5 kg and 25 kg sizes.
BA20 - ALUMINA CALCINED 300 MESH
Available in 1 kg, 5 kg and 25 kg sizes.
BA30 - ALUMINA HYDRATE
Occasionally the preferred source of alumina in glaze because
it remains in suspension for a longer time. Available in 1 kg, 5 kg and 25 kg
sizes.
BA70 - ASH (SYNTHETIC)
A consistent mixture to replace the variable quality and
unreliable supply of natural wood ash. Available in 500gm,1 kg and 5 kg
sizes.
BA80 - BARIUM CARBONATE
A secondary flux in stoneware glazes, up to 10%, but most
frequently used to produce a satin-matt surface, up to 10-20%. Small quantities,
(.05-2%) are used in bodies to prevent scumming. Available in 1 kg, 5 kg and 25
kg sizes.
BA110 - BENTONITE
A highly plastic volcanic colloidal clay, used as a suspending
agent in glazes (2-3%) but it must be added to the dry ingredients. When added
to the clay body, it improves its plasticity (up to 50%). It has a high
shrinkage rate at stoneware temperatures. Available in 1 kg, 5 kg and 25 kg
sizes.
BA160 - BORAX (FINE)
Fine form of borax with the properties mentioned above. Available in 500gm, 1
kg, 5 kg and 25 kg sizes.
BA150 - BONE ASH (NATURAL)
The essential ingredient of a bone china clay, instrumental in
producing its characteristic translucency. Also a secondary flux in glazes
giving a milky quality. Available in 500gm,1 kg, 5 kg and 40 kg sizes.
BA160 - BONE ASH (SYNTHETIC)
Readily available replacement for the natural bone ash at a
much cheaper price. Will work well in low and high fire glazes. Available in
500gm,1 kg and 5 kg sizes.
BA170 - CALCITE (OMYA 10)
A purer form of Whiting. Available in 5 kg and 25 kg sizes.
BA180 - CHROME OXIDE
A versatile and high firing pigment, dark green in the unfired
state and generally producing an opaque green. In the presence of calcium it
produces a grass green and with cobalt and magnesium, a blue-green. In high
alkaline tin glazes it gives a deep pink (chrome tin) developing to purple if
boron is present. At low temperatures(-950°C) in high lead, low alumina glazes,
red to oranges are obtained often with a crystalline structure; if soda is
introduced to such a glaze the colour is modified to a bright yellow. In
the presence of zinc the predominant colour is brown. Black under reducing
conditions (1-3%). Available in 250gm, 500gm,1 kg, 5 kg and 25 kg sizes.
BA200 - BALL CLAY FX (CA1)
Highly plastic sedimentary clays used in bodies to improve
workability and in glazes to introduce silica and alumina, thereby helping
adhesion and suspension. From Axedale. Available in 5 kg and 25 kg sizes.
BA210 - BALL CLAY R
Same properties as above but from Rowsley. Available in 1 kg and 5 kg sizes.
BA213 - CLAY CERAM (BBR)
Available in 5 kg and 25 kg sizes.
BA220 - COBALT CARBONATE
A fine grained material which gives more distribution of
colour than cobalt oxide. Produces an evenly textured blue glaze (1-3%) which is
less intense than the oxide. Available in 50gm, 250gm, 500gm,1 kg and 5 kg
sizes.
BA230 - COBALT OXIDE (72% COBALT)
Cobalt almost always produces blues, which may vary somewhat
with glaze composition, high zinc glazes tending to give greenish blues
(especially if titanium is present) and high magnesium glazes tending to produce
lilac or pink hues. Cobalt is quite soluble on glazes, consequently it has
little or no opacifying effect in the amounts normally used (rarely more than
1-2%). Cobalt is an active flux and it may be necessary to take this into
account when using it in some glazes, as it may increase their fusibility quite
considerably. Like other raw oxides (or carbonates) of copper, manganese and
nickel, cobalt may cause blisters or bubbles in some glazes due to changing
oxidation state during the firing cycle. Available in 50gm, 250gm, 500gm,1 kg
and 5kg sizes.
BA240 - COLEMANITE
Insoluble form of boron i.e. a natural frit. Used in all types
of glazes, it also reduces the crazing tendencies. Develops opalescence typical
of boron compounds and in large quantities a broken mottled surface. The effects
can be variable and for consistency we suggest the use of colmanite frit.
Available in 500gm,1 kg, 5 kg and 25 kg sizes.
BA250 - COPPER CARBONATE
Copper gives green in most fritted glazes, the colour being
darker and richer in lead bearing glazes. In alkaline type glazes, the colour
tends to blue, as is also the case in "emulsion opacified" high boron
glazes, sometimes called "boron blues". Large amounts of copper in
glazes, especially lead glazes, give metallic effects and even graphite-type
matts. Copper is an active flux and it may increase glaze melt fluidity; it may
also cause crazing, due to its thermal expansion. In certain glaze compositions,
under controlled reducing conditions, copper compounds can produce the reduced
reds of "rouge flambé" and "sang-de-boeuf; however these are
difficult to obtain reliably and attempts to produce reducing conditions in some
kilns may be dangerous due to explosion risk. Since beautiful reds can now be
reliably made with cadmium-selenium glazes, there is no longer any necessity to
produce the reduced copper reds. Copper carbonate ensures a more evenly
distributed colour. Available in 50gm, 250gm, 500gm,1 kg and 5 kg sizes.
BA260 - COPPER OXIDE (BLACK)
Used to produce black colours in glazes, as explained above. Available in 250gm,
500gm,1 kg, 5 kg and 25 kg sizes.
BA280 - CORNISH STONE (SYNTHETIC)
This material is a blend of selected minerals (no fluorine)
which have a chemical analysis very similar to that of the naturally occurring
stone. It is an alternative to, though not direct replacement of, feldspar as a
high temperature flux, having slightly less fluxing power. It can also be used
as a secondary flux in low temperature glazes. Available in 1 kg, 5kg and
25 kg sizes.
BA290 - CROCUS MARTIS (IRON OXIDE PURPLE)
An impure form of iron oxide often producing speckled effects
(4-8%). Available in 500gm,1 kg and 5 kg sizes.
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