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Imco 400 Fireclay

Alternate Names: Imco 400

Oxide Analysis Formula
CaO 0.66% 0.04
K2O 1.42% 0.05
MgO 0.66% 0.06
Na2O 0.14% 0.01
Al2O3 28.50% 1.00
SiO2 52.00% 3.10
Fe2O3 2.25% 0.05
TiO2 1.28% 0.06
LOI11.70%
Oxide Weight 311.05
Formula Weight 352.26

Notes

A milled and air floated Lincoln fireclay. An all purpose clay with high strength and plasticity.

It is not clear why the chemistry for this is different than for IMCO 800 if they are both airfloated Lincoln fireclays.

In our tests we found it to be very smooth, plastic and has a kaolinish feel. It has high alumina like a kaolin. Although it fires straw-colored at cone 6, it turns to greenish at cone 7 and becomes very dense by 9. It is still stable at cone 11 and cone 10R is not bloating or expanding either. It has some light brownish scumming on the 8+ bars at the edges (but this covers most of the surface on the 10R bar). This is not really a fireclay, it is vitreous at cone 10.

Related Information

IMCO 400 Fireclay fired bars

Cone 10R top, 11 oxidation and downward below that. This material, although called a "fireclay", is more fine grained and much more vitreous than what would normally be considered a refractory fireclay. Is it similar to Lincoln Fireclay (from California).

Links

Materials Plainsman Fireclay
Materials Fireclay
Materials Imco 800 Fireclay
Materials Lincoln 60 Fireclay
Materials M-4 Fireclay
Materials APG Missouri Fireclay
URLs http://www.clayimco.com/local-clays.html
IMCO information on their mined clays
Typecodes Fireclay
Fireclays are non-kaolin non-ball clay materials similar to stoneware clays but lacking fluxing oxides. Many fireclays have a PCE of 28 or more.
Suppliers Industrial Minerals Co
Hazards Quartz Toxicity

Data

Drying Shrinkage5% @ 27% water
Firing ShrinkageCone 6: 7.7% Cone 7: 8.2 Cone 8: 8.7 Cone 9: 8.5 Cone 10: 8.0
Sieve Analysis Dry+65: 0.1 +100: 0.1 +150: 0.2 +200: 0.4 +325: 0.5
Water absorptionCone 6: 4% Cone 7: 1% Cone 8: 0.1% Cone 10: 0%

By Tony Hansen


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