RM 3401 Alumina Hydrate
Alumina hydrate promotes opacity in enamels and glazes by generating gas bubbles in the glaze melt.
RM 3402 Barium Carbonate
If available in sufficient amount, barium will promote crystallization of a melt during cooling, thus imparting a measure of opacity.
RM 3404 Batt Wash
RM 3407 Ball Clay Hyplas
Ball clay is the main plastic material used in clay bodies of all types
RM 3407 Ball Clay Hymond
RM 3411 Bentonite
bentonite can greatly improve glaze suspension by gelling it. In addition it will harden the dry layer.
RM 3412 Bone Ash
Low temperature glazes sometimes employ bone ash for opacity because of the milky quality it produces. It can also be used to assist tin oxide where a less shiny surface can be tolerated. Bone ash encourages strong glaze textures; however, too much can produce crazing.
RM 3416 China Clay
RM 3418 Colemanite
Colemanite has been a popular natural source of insoluble boron for many decades. It is similar to Ulexite in its oxide contribution to glazes
RM 3419 Cornish Stone
Cornish stone is a low iron feldspar material used primarily as a flux in clay bodies and glazes.
RM 3424 Dolomite
Dolomite is ground magnesium limestone rock, it combines calcium and magnesium carbonates
RM 3426M Potash Feldspar
One of the most important materials for medium and high temperature ceramic glazes. It supplies potash, alumina, silica and often some magnesia and calcia to the glaze. Potash feldspars are not usually as pure and white as soda spars. Feldspar is called 'potash' if there is more sodium than potassium.
RM 3427 Soda Feldspar
In many cases soda and potash feldspar are interchangeable in glaze recipes. However, some differences will be apparent. For example, slightly different colour responses will be encountered (i.e. cobalt tends toward purple copper toward blue
with soda spar). Sometimes colours will be brighter with soda feldspar.
RM 3428 FFF Feldspar
A mixed grade of good consistency.
RM 3431 Flint
Very refractory material used to provide silica in bodies and glazes. Increases firing temperature and craze resistance but reduces plasticity and shrinkage.
RM 3432 Fluorspar
Used in frit preparation and as a low-fire enamel opacifier. It's value lies in the fact that it is an active flux and at the same time an opacifier.
RM 3435 Gum Arabic
Many types of gum are available. Almost all are intended to make the glaze harden and adhere to the ware. Normally only small amounts are needed and they are put into the water before powder is added.
RM 3436 Ilmenite
Fine Ilmenite can be used with rutile to produce classic rutile-breaking glazes.
RM 3438 Lepidolite/ Pedolite
It is a raw material for the production of lithium carbonate. Like other feldspars, it softens over a range (1150-1300C). It has a lower fusion point than most high temperature feldspars.
RM 3439 Lithium Carbonate
A good alkaline flux used as a substitute for soda and potash when a good craze resistance is required. Provides typical alkaline colour response.
RM 3440 Magnesite
A basic refractory used mainly in high temperature furnaces
RM 3442 Magnesium Sulphate
Diminishes resistance to thermal shock thus provokes crackles. Strong opacifier at all temperatures.
RM 3443 Matting Agent
RM 3444 Water Based Media
RM 3445 Media Painting
RM 3448 Mould makers Size
RM 3449 Nephaline Syenite
Mineral mixture of feldspar and hornblende with little silica. More fusible than feldspar it can be used as a replacement toreduce the maturing range of glazes and bodies.
RM 3450 Casting Plaster
A selected high quality superfine plaster ideal for the production of moulds.
RM 3450/3 Herculite Plaster
A harder setting dense plaster used in the production of block and case moulds.
RM 3452 Quartz Silica
Introduces silica and alternative to flint in glazes although not an exact replacement for flint in clay bodies.
RM 3454 Rutile
An ore containing titanium dioxide with iron oxide used to produce a mottled buff brown colour (3-8%) especially in the presence of ilmenite. Increases opacity of glaze. Exciting effects may be achieved in combination with stains or colouring oxides
RM 3457 Silicon Carbite
SiCA finely ground material used as a local reducing agent in glazes to obtain reduced effects in oxidised (electric) firings.
RM 3458 Soda Ash
Used in the preparation of casting slips in combination with sodium silicate. Its solubility in water makes it effective as the alkaline glaze constituent of Egyptian Paste.
RM 3459-02 Sodium Dispex
An alternative to sodium silicate. Gives improved stability and mould life. Liquid and easy to use.
RM 3460-075 Sodium Silicate
Liquids used in preparation of casting slips by deflocculation.
RM Spodumene
Spodumene is a silicate mineral often referred to as lithium feldspar. Its mineral form is characterized by hard needle-like grains of brilliant white color. It is used in ceramics as a source of lithia.
RM 3466 Talc
Talc is a refractory powder and can promote matteness and opacity when added to low-fire glazes.
RM 3469 Wax emulsion
Used to paint an area of ware over which no glaze is required, the glaze not adhering to the resist which burns away during firing.
RM 3470 Whitting
The main source of calcium in glazes and extensively used as a flux in stoneware and porcelain glazes. Assists hardness and durability and in large quantities produces mattness.
RM 3473 Wollastonite
An alternative to whiting as a source of lime in stoneware glazes. Less dissociation and therefore useful where pinholing is a problem.
RM 3471M Wood Ash
A mixed grade for ash glazes.
RM 3477 Zirconium Silicate
An alternative opacifier to Zircon.
