FreeShip- Porcelain Grog, Molochite, 30 Mesh - (Prompt rebate on orders with 3 or more FreeShip items!)

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Not all quantities are pictured.

We carry several mesh sizes of Molochite, a 30 mesh, a 50x80 mesh, a 120 mesh, and a 200 mesh (which we're out of right now). See the link above.
Grog is a hard, calcined clay or clay-like material which is then ground to a specific mesh size. Grogs are made of many different clays and minerals. Grogs are added to clay bodies to improve specific properties of the clay.
Molochite used as a grog is probably the whitest and cleanest in existence. Which makes it the grog of choice for porcelain clay bodies. It's a high calcined Grolleg clay, and comes in a broad selection of mesh sizes. Molochite is of interest in the arts community not only for ceramics, but it can be used as an ingredient (or alone) in the plaster-like high temperature investment material used when covering/molding the wax model in the lost wax method of metal casting (many types of investment formulas exist). Molochite contains no crystalline silica and and so has a low thermal expansion and excellent dimensional stability over temperature ranges.
The French industrial minerals company, Imerys owns the Molochite Brand trademark. They say { https://imerys-refractoryminerals.com/europe-cis-mena/products/molochite/ } :
"Molochite™ is produced using china clay from extensive deposits in Cornwall which are primary in nature. These deposits are renowned for their fine quality, consistency and the extent of their reserves. They provide materials that are low in iron and alkali and high in alumina.
Our high-fire, long-soak process for producing crystalline silica-free Molochite in Cornwall (UK) gives a unique set of expansion properties that limit cracking caused by quartz phase changes allowing for consistency and expansion control.
The low, uniform thermal expansion rate of Molochite gives it excellent resistance to thermal shock, while the rough particles gives excellent keying properties for clay or chemical bonding.
Molochite is a high grade material with consistent composition and physical properties. It is available in a number of controlled gradings that are suited to a wide range of manufacturing techniques for producing the required alumino-silicate refractories at common firing temperatures."

The Digital Fire ceramics database says { https://digitalfire.com/4sight/material/molochite_1034.html } :
"Molochite is a pure white made-made granular material. The granules are hard and refractory. It is made by firing raw low-iron kaolin to very high temperatures to bring about maximum conversion of the clay crystal to crystalline mullite (usually 95%+). The latter has high mechanical stability and resistance to thermal shock.
Molochite is available in a wide range of sizes (from 8 to 325 mesh) and in dedusted form. It is a very uniform material. It can be used as a very white firing porcelain grog and aggregate material (but be careful with the material you choose to be sure it has no iron particles). However, its chief use is in the investment casting industry, where successive coats of increasingly coarser molochite slurry are applied onto wax models. After drying, the wax is melted out and the molten metal poured in.
Since molochite is used for mechanical purposes in most applications, its chemistry is not usually a consideration (although it will have the chemistry of a calcined kaolin of course)."

Grog is a hard, calcined (fired at high temperatures) clay or clay-like material which is then ground to a specific mesh size. Grogs are made of many different clays. It can be used for practical or aesthetic reasons in a clay body, i.e. to give the finished ceramic texture and color. It has several practical functions:
Grog is normally used in ceramics as a clay body additive which gives texture or "tooth" to a clay when green (pre-fired). It also "opens" up a clay body allowing thorough drying, thicker walls, faster temperature rise when firing, and lessens the chance for a piece exploding during firing. It helps with thermal shock. It "aerates" a clay so that pots when thrown (for example) will have increased strength and stand up better when throwing. It reduces shrinkage and warping. It can also be used outside of ceramics when mixed with resins for aesthetic, strength, and filler (extender) reasons.

Wikipedia has a sparse article of a particular type of grog. They treat it as if any other grog is not grog.
{ https://en.wikipedia.org/wiki/Grog_(clay) } :
"Grog, also known as firesand and chamotte, is a raw material for making ceramics. It has a high percentage of silica and alumina.
It is normally available as a powder or chippings, and is an important ingredient in Coade stone (an ancient type of ceramic stoneware)...
Grog is composed of 40% minimum alumina, 30% minimum silica, 4% maximum iron(III) oxide, up to 2% calcium oxide and magnesium oxide.....
Grog is used in pottery and sculpture to add a gritty, rustic texture called "tooth"; it reduces shrinkage and aids even drying. This prevents defects such as cracking, crows feet patterning, and lamination. The coarse particles open the green clay body to allow gases to escape. Grog adds structural strength to hand-built and thrown pottery during shaping, although it can diminish fired strength.
The finer the particles, the closer the clay bond, and the denser and stronger the fired product. The strength in the dry state increases with grog down as fine as that passing the 100-mesh sieve, but decreases with material passing the 200-mesh sieve."-

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Reviews

Reviews (2)

Average:

Dec 16, 2023

George Palermo

May 8, 2023

Great stuff!

Whitney Law