Talcs to substitute for Natural C-98

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Cimtalc 15 Talc lab test

Code #

L4158

Materials Amt Units
M23 Ball Clay 44.000 50BG 27.61%
*3D 2.000 3DBKT 47.92%
*Cimbar Cimtalc 15 Talc 31.000 50BG 19.45%
Bentonite 8.000 50BG 5.02%

Total:3,614,406.80 (R)

Notes

L4115K2 lab recipe for L211 using "Cimbar" Cimtalc 15 talc received from Quadra Chemicals Ltd. We are trying to find a replacement for Natural Minerals C-98 talc from Texas.
Took 2500 gms. water to slip up 2000 gms. powder.

Pictures

L4158 vs. K3 (Natural Talc)

Left Cimtalc 15, Right: Natural C-98 talc
Color very close.

Silverline, C-98, CimTalcs in the same body

Fired to cone 04.
The clay is L4115K2, a ball clay, Plainsman 3D and talc recipe. Talc is only 20%.
Each mug uses a different talc (left to right):
Silverline, Natural Talc, Cimtalc 15, Cimtalc 9115
Transparent glaze inside, spectrum brights on the outsides.

L4158 vs L4159 fired bars

L4158 Crazed badly after 6 months

G1916Q outside, Spectrum black inside. Both crazed.

Testdata

SHAB - Shrinkage/Absorption

DLEN FLEN FWT BWT CONE DSHR FSHR ABS
493.7888.4538.9439.756.06.2%5.7%2.1%
693.788.8337.133.96.3%5.2%
593.7790.1838.4741.412.06.2%3.8%7.6%
393.5290.837.45-2.16.5%2.9%
293.4491.7339.9645.23-4.06.6%1.8%13.2%
193.3792.5639.1145.31-6.06.6%0.9%15.9%

LDW - LOI/Density/Water Content

WWGT DWGT FWGT H2O LOI DENS
126.8921.1019.4821.5%7.7%

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cimtalc 15 Talc lab test" id="152539" key="i1chnmH1" date="2021-03-26" codenum="L4158"> <recipelines> <recipeline material="M23 Ball Clay" amount="44.000" tolerance="" unitabbr="50BG"/> <recipeline material="3D" amount="2.000" tolerance="" unitabbr="3DBKT"/> <recipeline material="Cimbar Cimtalc 15 Talc" amount="31.000" tolerance="" unitabbr="50BG"/> <recipeline material="Bentonite" amount="8.000" tolerance="" unitabbr="50BG"/> </recipelines> </recipe> </recipes>

Born: 2018-12-11, Modified: 2021-03-26 10:56:58

Cimtuff 9115 Talc lab test

Code #

L4159

Materials Amt Units
M23 Ball Clay 44.000 50BG 27.61%
*3D 2.000 3DBKT 47.92%
*Cimbar Cimtuff 9115 Talc 31.000 50BG 19.45%
Bentonite 8.000 50BG 5.02%

Total:3,614,406.80 (R)

Notes

L4115K2 lab recipe for L211 using "Cimbar" Cimtuff 9115 talc received from Quadra Chemicals Ltd.

When compared to Cimtalc 15 talc (L4158), 9115 is whiter in the raw state.
Fired bars, especially at cone 02, prefer this one also (for whiteness).
There is no difference in fired color between this and natural talc in any test we did.

Took 2500 gms. water to slip up 2000 gms. powder.

These two talcs seem to create a less plastic body than Silverline and Natural. Notwithstanding that, the slip generated is extremely slippery and makes throwing very thin pieces possible.

Pictures

Cimtalc 15, 9115 on talc:ball clay body

Fired cone 04. Ball is 50:50 talc:ball clay.

L4158 left, L4159 right.

Silverline, C-98, CimTalcs in the same body

Fired to cone 04.
The clay is L4115K2, a ball clay, Plainsman 3D and talc recipe. Talc is only 20%.
Each mug uses a different talc (left to right):
Silverline, Natural Talc, Cimtalc 15, Cimtalc 9115
Transparent glaze inside, spectrum brights on the outsides.

Untitled

Testdata

SHAB - Shrinkage/Absorption

DLEN FLEN FWT BWT CONE DSHR FSHR ABS
493.5688.2235.9536.86.06.4%5.7%2.4%
693.4388.8737.2439.33.96.6%4.9%5.5%
793.2688.5737.7539.523.96.7%5.0%4.7%
593.4890.0936.152.06.5%3.6%
393.3790.8635.639.67-2.16.6%2.7%11.4%
293.3191.6936.241.1-4.06.7%1.7%13.5%
193.4592.5837.2843.21-6.06.6%0.9%15.9%

LDW - LOI/Density/Water Content

WWGT DWGT FWGT H2O LOI DENS
126.0520.3418.8721.9%7.2%

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cimtuff 9115 Talc lab test" id="152542" key="Ps9KNjNe" date="2021-04-21" codenum="L4159"> <recipelines> <recipeline material="M23 Ball Clay" amount="44.000" tolerance="" unitabbr="50BG"/> <recipeline material="3D" amount="2.000" tolerance="" unitabbr="3DBKT"/> <recipeline material="Cimbar Cimtuff 9115 Talc" amount="31.000" tolerance="" unitabbr="50BG"/> <recipeline material="Bentonite" amount="8.000" tolerance="" unitabbr="50BG"/> </recipelines> </recipe> </recipes>

Born: 2018-12-11, Modified: 2021-04-21 12:29:03