G2934 (glossed using ZnO)
|
Code # G2934J1 |
| Materials | Amt | |
|---|---|---|
| Ferro Frit 3110 | 11.600 | 13.43% |
| EPK | 22.500 | 26.04% |
| Wollastonite | 8.300 | 9.61% |
| Silica | 8.300 | 9.61% |
| Zinc Oxide | 3.900 | 4.51% |
| Silverline Talc (Talc) | 16.600 | 19.21% |
| Calcined Kaolin | 15.200 | 17.59% |
Total:86.40
Auto Unity Formula
|
Si:Al: 5.3:1 5.8 (Molar:5.6) 4.8 Cost 0.25 per kg |
Notes
This removes B2O3, adds Al2O3
Start with 50:50 water:powder mix for a good slurry.
This is going to need some gum to prevent cracking during drying.
Pictures
G2934J1 G2934 glaze cracking badly
Even when very thin.
G2934J1 glaze
Left sample: The J1 on the right is high gloss but when we remixed (right sample) it does not work. Since the intention was to create more matteness than G2934J the gloss one must have been an error.
G2934J1 G2934 on P300
Creating an interesting pattern because of the cracking during drying.
Typecodes
C6-Cone 6 Glazes
XML (to paste into Insight)
<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="G2934 (glossed using ZnO)" id="216096" key="i5CTZBXL" date="2023-12-08" typecodes="C6" codenum="G2934J1" picturebasename=""> <recipelines> <recipeline material="Ferro Frit 3110" amount="11.600" tolerance=""/> <recipeline material="EPK" amount="22.500" tolerance=""/> <recipeline material="Wollastonite" amount="8.300" tolerance=""/> <recipeline material="Silica" amount="8.300" tolerance=""/> <recipeline material="Zinc Oxide" amount="3.900" tolerance=""/> <recipeline material="Silverline Talc" lookup="Talc" amount="16.600" tolerance=""/> <recipeline material="Calcined Kaolin" amount="15.200" tolerance=""/> </recipelines> </recipe> </recipes>
Born: 2014-03-21, Modified: 2023-12-08 20:53:32
Cone 6 Magnesia Matte Base
|
Code # G2934 |
| Materials | Amt | |
|---|---|---|
| Ferro Frit 3124 | 19.400 | 19.01% |
| EP Kaolin | 18.300 | 17.93% |
| Dolomite | 23.500 | 23.03% |
| Silica | 26.960 | 26.42% |
| Calcined Kaolin | 13.900 | 13.62% |
Total:102.06
|
Si:Al: 6.0:1 5.8 (Molar:5.7) 13.6 |
Notes
This matte recipe was developed from our high-dolomite recipe originally used to compare shipments of dolomite for consistency. In our standard firings, this recipe produces both good mattenss and a very functional surface coupled with a low chance of crazing on almost any body. This is not a reactive matte, it is intended for functional and durable surfaces. This is also adjustable, the degree of matteness can be controlled by blending in a glossy or cooling rate.
WARNING: The degree-of-matteness is very dependent on cooling rate in the kiln. Fast cooling (e.g. our PLC6DS firing schedule in a lightly-loaded or smaller kiln) produces a silky matte or even glossy surface. Slower cooling (e.g. a heavily loaded kiln or the C6DHSC schedule) may produce a matter surface than you need (which is more subject to cutlery marking). Control the degree of mattness by either adapt the firing curve or blending in some glossy G2926B (simply the slurries pouring together, volumetrically is a good way to determine the ratio needed).
This has a very low thermal expansion, meaning it won't craze on just about any clay body. However, on some, it could shiver or lead to glaze compression issues. Use G2934Y2 if this is a problem for you.
https://plainsmanclays.com/g2934 documents this recipe using a variety of stains.
Pictures
G2934 with Hemlock Green, Pansy Purle Stains
Cone 6 GBMF tests: 10 gram balls have been melted down onto a tile at cone 6.
Top: G2934 with normal flow.
Left: 8% 6213 Hemlock Green. Needs significant flux.
Right: 8% 6305 Violet stain. Flowing a little less, needs a little flux.
True mattes should still be matte if overfired
GBMF test to compare.
The G2934 is a high-MgO matte, it melts well and does not cutlery mark or stain easily. As evidence that it is a true matte, notice that it is still matte when fired to cone 7 or 8. VC71, while having a similar pleasant silky matte surface at cone 6, converts to a glossy if fired higher (suggesting that its cone 6 matteness is due to incomplete melting). For the same reason the VC71, it is whiter in color (but as soon as it begins to melt and have depth the color darkens).
G2934 + 5% Titanium thinner/thicker on M390
Incredible cone 6 speckle body with G2934 matte glazes
This clay, L4115J3S, a Plainsman 3D-based body, fires vitreous and dense, yet there is no hint of bloating. With these matte glazes very durable and functional pieces are produced.
Outside glaze on both is G2934W (adds 10% zircopax). In our C6DHSC firings this produces as matte a surface as is possible without having excessive staining problems. To add a little gloss we blend in 15% of the G2926B Glossy clear.
Inside glazes:
Left mug: L4423A (85:15 mix of G2934 matte/G2926B clear glossy). It does not contain any zircopax.
Right mug: G2926B ball milled glossy, producing a striking visual yet highly functional surface.
These mugs look as close to cone 10R dolomite-glazed ware as we have ever seen! Especially the L4423A recipe
Melt flow comparison: G2934 with Frit 3124, Frit F-19
Fusion Frit F-19 is giving a more fluid melt.
The difference cooling-rate makes
These are the G2934 black glaze at cone 6. The piece on the left was fired using the C6DHSC firing schedule (drop-and-hold at 2100F then 150F/hr to 1400F). The one on the right was fired using the PLC6DS schedule (drop-and-hold at 2100F then free-fall from there). The slow cool gives the glaze on the left time to crystallize, creating a stony matte.
G2934 Cone 6 Matte + 4% iron oxide
URLs
Prepared public do..om Plainsman Clays
Typecodes
C6-Cone 6 Glazes
Alternate Code Number:MG6CDM
XML (to paste into Insight)
<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cone 6 Magnesia Matte Base" id="56852" key="wGDbgHvN" date="2025-03-24" typecodes="C6" codenum="G2934" picturebasename=""> <recipelines> <recipeline material="Ferro Frit 3124" amount="19.400" tolerance=""/> <recipeline material="EP Kaolin" amount="18.300" tolerance=""/> <recipeline material="Dolomite" amount="23.500" tolerance=""/> <recipeline material="Silica" amount="26.960" tolerance=""/> <recipeline material="Calcined Kaolin" amount="13.900" tolerance=""/> </recipelines> </recipe> </recipes>
Born: 2014-03-21, Modified: 2025-03-24 19:21:21
G2934 with ZnO for Brown Stains
|
Code # G2934J |
| Materials | Amt |
|---|---|
| Fusion Frit F-19 | 23.600 |
| EPK | 22.500 |
| Wollastonite | 8.300 |
| Silica | 13.300 |
| Zinc Oxide | 4.400 |
| Silverline Talc (Talc) | 16.600 |
| Calcined Kaolin | 11.200 |
Total:99.90
Auto Unity Formula
|
Si:Al: 6.1:1 5.7 (Molar:5.6) 4.1 Cost 0.22 per kg |
Notes
Glossy at cone 6 and 8. Needs more MgO, less SiO2, more Al2O3, less B2O3.
Pictures
G2934J at cone 6 on M370 is firing ultra gloss
Typecodes
C6-Cone 6 Glazes
XML (to paste into Insight)
<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="G2934 with ZnO for Brown Stains" id="215445" key="oc8AFsRP" date="2022-05-26" typecodes="C6" codenum="G2934J" picturebasename=""> <recipelines> <recipeline material="Fusion Frit F-19" amount="23.600" tolerance=""/> <recipeline material="EPK" amount="22.500" tolerance=""/> <recipeline material="Wollastonite" amount="8.300" tolerance=""/> <recipeline material="Silica" amount="13.300" tolerance=""/> <recipeline material="Zinc Oxide" amount="4.400" tolerance=""/> <recipeline material="Silverline Talc" lookup="Talc" amount="16.600" tolerance=""/> <recipeline material="Calcined Kaolin" amount="11.200" tolerance=""/> </recipelines> </recipe> </recipes>
Born: 2014-03-21, Modified: 2022-05-26 18:59:41
