FreeShip- Grog, CE47, Calcined Mullite, Mulcoa, 14x28 Mesh - (Prompt rebate on orders with 3 or more FreeShip items!)

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----> Go here to see other listings for grog: <----
https://www.etsy.com/shop/NorthernWestStuff?ref=hdr_shop_menu&search_query=grog
Not all quantities are pictured.

We also carry a 20x50 mesh and a very fine 325 mesh, see the link above. We also carry some CE70 grog.
There is only one supplier that I found carries CE"XX". Information about these grogs is very hard to find but they appear to be part of the "Mulcoa" product line. There was a mineral company that mined and processed industrial refractory minerals in Roswell, Georgia called "C-E Minerals, Inc." The closest thing to a website is here: https://makersrow.com/c-e-minerals :
"Introducing C-E Minerals a worldwide supplier of high quality aluminas, alumina-silica calcines, and fused minerals used in refractory, investment casting, semiconductor, abrasive, metal producing and many other industrial applications." It was founded in 1967, and was associated with the "Mulcoa" brand, a sort of "kleenex" brand which became a mineral name for calcined mullite. It appears to have been gobbled up by Imerys, in the 1990's. Imerys now markets mulcoa.
The Mulcoa connection is found in their 3 calcined mullite products which have tech data here:
https://imerys-refractoryminerals.com/wp-content/uploads/2014/09/Mulcoa-range.pdf
The 3 Mulcoa mullites are Mulcoa 47, Mulcoa 60, and Mulcoa 70. I found a forum which mentioned a fellow with a bag that said "Mulcoa Mulgrain by C-E Minerals", he searched and found it was the same thing as mullite. This was back in 2004. So, putting all that together the CE47 and CE70 are names given by the supplier who has some of the old C-E Minerals mullite, and just simplified the names into "CE47" and "CE70". If you go to Digital Fire here:
{ https://digitalfire.com/4sight/material/mulcoa_70_mullite_1053.html } you will find "Mulcoa 70 Mullite" which I maintain is the same thing as the CE70. By the way, Digital Fire sheds light on the numbers 47, 60, and 70, they are approximate alumina contents. So Mulcoa 47 Mullite (aka "CE47"):
"....Mulcoa 47 is 65% mullite and 20% glass and 15% cristobalite (the others have no cristobalite)". This is a calcined mullite grog.
Analysis:
Mulcoa 47 Calcine Grog
Mullite grog
Oxide Analysis Formula
TiO2 1.90% 0.052
Al2O3 46.80% 1.000
SiO2 50.00% 1.813
Fe2O3 0.95% 0.013
Oxide Weight 217.19
Formula Weight 217.19

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. The grog in this listing has a coarse/medium particle size, 14x28 mesh. It's one of the few "speckled" grogs I know of, having both light, medium, and dark particles. It can be used for practical or aesthetic reasons in a clay body (to give the finished ceramic textures and colors (if present). Overall it has a light brown appearance.
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 mixed with resins for aesthetic, physical 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. Times have changed.
{ 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 combined....
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."

This CE47 grog has the usual "blocky" particle shape, there are some that have an elongated "needle-like" shape and strengthen the clay body more than usual during throwing or shaping. Kyanite is one such grog which we also carry in 2 mesh sizes.
In the arts, grogs can be used in ceramics (see above), and as a filler/strengthener/colorant in cements and resins for castings. Also in pozzolan cement mixes for the same reasons. Used in cement mixes it would be considered a coarse sand aggregate.
Other aggregates we carry that would be in an extra coarse class are olivine, garnet, aluminum oxide, and river sand, here are links to them (we also have those materials in finer mesh sizes):

Garnet:
https://www.etsy.com/listing/671536301/freeship-garnet-abrasive-media-very?ga_search_query=garnet&ref=shop_items_search_2&frs=1

Olivine:
https://www.etsy.com/listing/660200394/freeship-olivine-sand-granular-very?ga_search_query=Olivine&ref=shop_items_search_1&frs=1

Aluminum Oxide:
https://www.etsy.com/listing/602288204/freeship-aluminum-oxide-abrasive-media-5?ga_search_query=aluminum%2Boxide&ref=shop_items_search_3&frs=1

River Sand:
https://www.etsy.com/listing/477407293/freeship-coarse-river-sand-concrete?ga_search_query=River%2Bsand&ref=shop_items_search_1&frs=1-

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Reviews

Reviews (3)

Average:

May 14, 2022

was happy to find this ingredient to try making molds for glass work in the kiln!

Aja Vaz

Mar 30, 2022

This material is exactly what I needed

pattyhusswest

Aug 8, 2021

Great shipping speed and price.

Courtney