Gerstley borate has almost no al 2 o 3, this is a problem because glazes need it and al 2 o 3 is normally sourced from clays, especially kaolin. Gillespie borate is a blended borate mineral for use in glaze formulas replacing gerstley borate on a pound for pound basis. Borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate, is an important boron compound, a mineral, and a salt of boric acid. Us for the last 50 plus years has been dominated by gerstley borate, a raw material that is prized for its. A standard substitute in glazes calling for colemanite. Gerstley borate real a sodiumcalcium borate compound used as a low and midrange glaze flux. But since gb is so plastic, adding more plastic materials to a glaze causes excessive drying shrinkage producing cracks and ultimately crawling. Gerstley is a natural borate similar to but not interchangeable with colemanite on a 1 to 1 basis.
A publication of digitalfire gives a number of different gerstley borate compositions. Borate mineral structures incorporate either the bo3 triangle or bo4 tetrahedron in which oxygen or hydroxyl groups are located. Gerstley borate material safety data sheet date of issue. Any fire extinguishing media may be used on nearby fires. Gerstley is a natural borate similar to but not interchangeable with colemanite on. It can be prepared by reacting calcium metal with boric acid. A hydrated form occurs naturally as the minerals colemanite, nobleite and priceite. A sodiumcalciumborate compound used as a low and midrange glaze flux. Tccs zinc borate is a low toxicity, white crystalline, inorganic compound primarily used as a flame retardant and smoke suppressant in plastics and cellulose fibers, paper, rubbers and textiles.
Gillespie borate gerstley borate substitute sheffield. Gillespie borate was developed through a careful formulation process that has resulted in a virtual chemical match to gerstely borate. As a flame retardant, zinc borate can replace antimony trioxide as a synergist in both halogenbased and halogenfree systems. Chemical composition of gerstley borate as a service to our customers, we had a qualified, independent agency do an analysis of a sampling of the gerstley borate we have been supplying for years and will continue to supply.
May 01, 2011 to generate a replacement, a new material was created. Gerstley borate rasorite 5 firefighting measures general hazard. David hendley on thu 5 aug 99 contrary to what has been said here on clayart last week, the colemanite of old and todays gerstley borate are far from the same material. Borate wood preservatives have been used to treat wood for interior construction including joists, sheathing, sill plates and other uses for over 70 years. To generate a replacement, a new material was created. Oxide match virtually identical to gerstley borate, this product requires no adjustment to formula and no extra additives are needed. Gerstley borate is a greywhite, odorless mineral product that is not flammable, combustible. Lowfire glaze recipes crusty glaze bb 1 cone 04 30 gerstley borate 50 kaolin 20 cryolite 100 description. If you have ever mixed a raku glaze it is very likely you have used a chemical called gerstley borate. Pyrophyllite pyrax hs 50 lb bag kyanite 325 mesh 50 pound bag htp ball clay 50 pounds dry.
A sodiumcalcium borate compound used as a low temperature flux which. At higher temperatures the recipe trends toward less kaolin to more silica and a little less gb e. However as a commercial product boric acid was documented as an insecticide in 1922 when p. Gillespie borate gerstley borate substitute sheffield pottery. Gerstley borate updategerstley borate is in stock and not going anywhere. Other companies are charging thousands of dollars to set up accounts and give you access to their msds online database. None, because gerstley borate is not flammable, combustible or explosive. It has thus been a staple among potters for many years.
From a prefired perspective the most critical element in the new material is its colloid content. A sodiumcalcium borate compound used as a low and midrange glaze flux. The first use of inorganic borates documented as an insecticide was in 1918. Borate mineral, any of various naturally occurring compounds of boron and oxygen. Most borate minerals are rare, but some form large deposits that are mined commercially. The result is as follows sio2% al2o3% fe2o3t% mno% mgo% cao%. Gerstley borate is a sparingly soluble greywhite mineral that may, at high concentrations, cause damage to. Pdf structure, properties and applications of borate glasses. Gerstley borate are notlisted on any proposition 65 list of carcinogens or reproductive toxicants. Gillespie borate is a blended borate mineral for use in glaze formulas replacing gerstley borate on a poundforpound basis. A hydrated form occurs naturally as the minerals colemanite, nobleite and priceite one of its uses is as a binder in some grades of hexagonal boron. Gerstley borate 1lb gerstley borate 5lbs gerstley borate 10lbs gerstley borate 50lbs qty. Since 1881, twenty mule team borax has revolutionized cleaning with allnatural, allpurpose, safe, borax.
For help selecting the proper type of treated wood for any setting, consider consulting the primary standardsetting body for treated wood, the american wood protection association awpa. March 2019 identification product name gerstley borate. It can help prevent crazing when used in small amounts, and can act somewhat as an opacifier in larger amounts, giving glazes a milky appearance. Calcium borate ca 3 bo 3 2, also called gerstley borate citation needed, is a bluish white crystal with a very defined structure. Consistency manufactured from high purity refined raw materials, gillespie borate is highly consistent from batch to batch. Powdered borax is white, consisting of soft colorless crystals that dissolve easily in water. The theoretical formula for colemanite yes, it was named for a guy named coleman, in california, in the 19th century is. Aug 30, 2017 it is high in sodium and lower in silica than other feldspars and melts around cone 6. When we try to remake gerstley borate from materials which are commercially readily available on the market, it is necessary to have the chemical formula of gerstley borate. Chemical analysis typical features consistency manufactured from high purity refined raw materials, gillespie borate is highly consistent from batch to batch. Some feel this chemical was the spawn of hell due to inconsistency of the supply, how it reacted once mixed, or any number of other reasons. Theoretically, this should be simple, but in order to melt a glaze at cone 6 2232 degrees f, 1222 degrees c, you need to add different fluxes, all of which have different color responses. Standard thermodynamic properties of chemical substances continued molecular. As a control composition for this study 26 percent gerstley borate was used in.
This is a conglomerate mineral made up primarily of colemanite, ulexite and hectorite. Your new online msds binder is a place for you to store the material safety data sheets you need to deploy. Gillespie borate gerstley borate substitute potclays. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Gerstley borate official composition page from laguna clay. Gillespie borate is comprised principally of ulexite sodium calcium borate, with small amounts of colemanite calcium borate and other mineralsjust like. Many gerstley borate substitutes are manufactured by various companies, under names like laguna borate, gillespie borate, akiko borate, boraq, and a few others. Gerstley borate real a sodiumcalciumborate compound used as a low and midrange glaze flux. Gillespie borate is comprised principally of ulexite sodium calcium borate, with small amounts of colemanite calcium borate and other minerals just like gerstley borate. The theoretical formula for colemanite yes, it was named for a guy named.
Gillespie borate gerstley borate substitute potclays studio. Through years of formulation and reformulation, karl miller developed albany slip substitute which is intended to reproduce the. Gerstley borate is a sodiumcalcium borate compound used in ceramics as a low. A sodiumcalcium borate compound used as a low temperature flux which helps prevent crazing. Gillespie borate, which is virtually identical to gerstley borate in terms of physical, mineralogical and chemical composition. Gerstley borate material safety data sheet date of issue may. Sep 29, 20 5 gerstley borate 1999 2 whiting 41 feldsparcuster 12 ball clay number 1 10 red art 4 spodumenegwalia 9 dolomite 7 bone ash 3 talc 2 lithium carbonate 5 silica 100 total additives 2 crocus martis 1 manganese dioxide 1.
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