Imco Carbondale Clay - C-Red
|
Code # L2553B |
Location BD 763 |
Notes
*This clay is the reddest firing clay we have seen. The raw color is so red that one might suspect iron oxide has been added, but during the sieve analysis it did not wash away. So this is the real thing.
Plasticity is very good.
We have not tried this material in a casting body.
The dry strength is not as high as would be expected for the level of plasticity.
The DFAC disk has soluble salts, but they are spread all over the sample rather than being concentrated at the edge? They are a darker red color and about medium intensity.
We found it possible to make pieces using the pure clay, without additives. It seems to work well with the glazes tried, not causing pinholes etc.
Fired bars show toasty red cone 1-3 shifting suddenly to a darker red by virtue of a solubles surface that alters color to deep variegated red going to very deep red-brown at the edges. The material is very thermally stable considering how high in iron it is.
Pictures
Alternate Code Number:MICARBON
Testdata
SHAB - Shrinkage/Absorption
| DLEN | FLEN | FWT | BWT | CONE | DSHR | FSHR | ABS | |
| 8 | 93.47 | 86.09 | 35.97 | 39.03 | 8.3 | 6.5% | 7.9% | 8.5% |
| 7 | 93.24 | 86.61 | 36.24 | 39.89 | 6.9 | 6.8% | 7.1% | 10.1% |
| 6 | 93.53 | 87.63 | 35.47 | 39.7 | 6.3 | 6.5% | 6.3% | 11.9% |
| 5 | 93.35 | 87.98 | 36.05 | 40.55 | 5.1 | 6.7% | 5.8% | 12.5% |
| 4 | 93.2 | 87.99 | 36.33 | 41.14 | 4.5 | 6.8% | 5.6% | 13.2% |
| 3 | 93.17 | 88.2 | 37.89 | 43.07 | 2.9 | 6.8% | 5.3% | 13.7% |
| 2 | 93.14 | 88.3 | 37.06 | 42.27 | 2.0 | 6.9% | 5.2% | 14.1% |
| 1 | 93.33 | 88.62 | 35.84 | 41.05 | .9 | 6.7% | 5.0% | 14.5% |
SOLU - Soluble Salts
| FIRE | |
| 1 | LIGHT |
DFAC - Drying Factor
| DFAC | |
| 1 | A000 |
SIEV - Sieve Analysis 35-325 Wet
| TOT | 100M | 150M | 200M | 325M | |
| 1 | 100 | .22 | .62 | 1.91 | 3.26 |
LDW - LOI/Density/Water Content
| WWGT | DWGT | FWGT | OWGT | IWGT | H2O | LOI | DENS | |
| 1 | 34.77 | 25.99 | 23.7 | 26.24 | 12.48 | 25.3% | 8.8% | 1.9g/cc |
XML (to paste into Insight)
Born: 1994-04-22, Modified: 2023-05-04 10:04:53
Carbondale M390 #1
|
Code # L4530 |
| Materials | Amt | |
|---|---|---|
| Carbondale Red | 30.000 | 29.91% |
| A2 Ball Clay | 30.000 | 29.91% |
| 3D Clay | 40.000 | 39.88% |
| Barium Carbonate | 0.300 | 0.30% |
Total:100.30
Notes
*We are doing this test to have an insurance policy in the event that we are unable to handle to increasing border complexities of importing raw clay from our Montana quarry.
Feels smooth with slight tooth during throwing, nicely plastic. But drying shrinkage is too high.
Fired color is very good, matches or betters that of M390.
Pictures
M390 vs L4530 Carbondale - fired bars
The fired color match at cone 6 with M390 is good (better than good, this is better!). This recipe is more color stable above cone 6. That is because it is not as vitreous, it has 4% porosity at cone 6. That being said, the color is so compelling that it seems advantageous to simply be sure that glazes used do not craze.
L4530 cup with clear glaze cone 6
Like other iron bodies, bubble clouding in transparent glazes is happening. But this body is not as bad as others, likely because of not being as vitreous.
L4530 Carbondale mug
The iron in the body obviously affects the whiteness of this ziron pacified glaze.
Testdata
SHAB - Shrinkage/Absorption
| DLEN | FLEN | FWT | BWT | CONE | DSHR | FSHR | ABS | |
| 8 | 92.63 | 86.56 | 39.3 | 40.25 | 8.0 | 7.4% | 6.6% | 2.4% |
| 7 | 92.3 | 86.48 | 39.72 | 40.94 | 7.0 | 7.7% | 6.3% | 3.1% |
| 6 | 92.25 | 86.76 | 39.84 | 41.45 | 6.0 | 7.8% | 6.0% | 4.0% |
| 5 | 92.36 | 87.07 | 39.8 | 41.72 | 5.0 | 7.6% | 5.7% | 4.8% |
| 4 | 92.14 | 87.25 | 40.05 | 42.58 | 4.0 | 7.9% | 5.3% | 6.3% |
| 3 | 91.77 | 87.3 | 37.21 | 40.06 | 3.5 | 8.2% | 4.9% | 7.7% |
XML (to paste into Insight)
<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Carbondale M390 #1" id="221333" key="bFrC9S1j" date="2022-09-08" codenum="L4530"> <recipelines> <recipeline material="Carbondale Red" amount="30.000" tolerance=""/> <recipeline material="A2 Ball Clay" amount="30.000" tolerance=""/> <recipeline material="3D Clay" amount="40.000" tolerance=""/> <recipeline material="Barium Carbonate" amount="0.300" tolerance=""/> </recipelines> </recipe> </recipes>
Born: 2022-07-07, Modified: 2022-09-08 09:57:09
Carbondale M390 #2
|
Code # L4530A |
| Materials | Amt | |
|---|---|---|
| Carbondale Red | 30.000 | 29.91% |
| *A2 | 20.000 | 19.94% |
| *3D | 50.000 | 49.85% |
| Barium | 0.300 | 0.30% |
Total:100.30
Notes
*Bars marked L4230A.
This recipe change from L4530 cuts plasticity by reducing the percentage of ball clay (cuts drying shrinkage also).
Plasticity is excellent.
Pictures
L4530A Carbondale M390 mug
G2926B white inside, G2934White outside
L4530A Carbondale M390 vs M390
The recipe change from L4530 appears to have increased maturity at cone 6, from 4% porosity down to 3%. Red color is still good, but it does change to brown by cone 7 so care is needed not to over fire.
Testdata
SHAB - Shrinkage/Absorption
| DLEN | FLEN | FWT | BWT | CONE | DSHR | FSHR | ABS | |
| 9 | 93.1 | 86.4 | 36.91 | 37.21 | 9.0 | 6.9% | 7.2% | 0.8% |
| 8 | 93.2 | 86.8 | 37.2 | 37.67 | 8.0 | 6.8% | 6.9% | 1.3% |
| 7 | 93.2 | 87.4 | 36.8 | 37.6 | 7.0 | 6.8% | 6.2% | 2.2% |
| 6 | 93.2 | 87.6 | 36.27 | 37.44 | 6.0 | 6.8% | 6.0% | 3.2% |
| 4 | 92.7 | 87.3 | 38.87 | 40.46 | 5.2 | 7.3% | 5.8% | 4.1% |
| 5 | 92.7 | 87.7 | 38.09 | 39.89 | 5.0 | 7.3% | 5.4% | 4.7% |
XML (to paste into Insight)
<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Carbondale M390 #2" id="221791" key="sa9t4Ppt" date="2023-05-03" codenum="L4530A"> <recipelines> <recipeline material="Carbondale Red" amount="30.000" tolerance=""/> <recipeline material="A2" amount="20.000" tolerance=""/> <recipeline material="3D" amount="50.000" tolerance=""/> <recipeline material="Barium" amount="0.300" tolerance=""/> </recipelines> </recipe> </recipes>
Born: 2022-07-07, Modified: 2023-05-03 11:40:50
