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About glazenerd

  • Rank
    Clay Research

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  • Gender
  • Location
    St. Louis, Mo.
  • Interests
    Crystalline glaze chemistry. Porcelain, Stoneware, Fritware, 04 Colored Porcelain clay research & formulation.
    Ceramics Monthly Articles: Jan. 2018 Cation Exchange (plasticity), April 2018 SSA Clay Formulation, May 2018 Bloating and Coring.
    Feb. 2019 Ceramics Monthly- Clay Body Shopping Guide
    March 2019 Ceramics Monthly - Porcelain 201

    Email: optix52@aol.com

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  1. Your clay is fine; just need to wedge it throughly. T
  2. Min: sorry it happened to you, never fun.
  3. Had a long discussion with the math professor from SIU-E about writing math equations for crystalline glaze: she thought it was doable. Interesting!

    1. Show previous comments  3 more
    2. Benzine


      You do eat it, but only a little over three pieces...

    3. glazenerd


      Are these three pieces squared?

    4. Benzine



  4. I will post pics, but it will be late summer probably. Mark called it a 50/50 shot, I am going to attempt crystalline glaze, so that is probably a fair estimate of success. T
  5. Sophia: if you cut up a 4" tile setter and use them as open racks; you can candle and bisq easily. You can also glaze fire, but extra care must be taken to ensure glaze is not making contact. It allows full circulation of air/heat. Tom
  6. After bumping into a painting contractor friend: now I am going to sand blast off the old glaze. (50 grit carbide)
  7. Mark: The auto sanitizer model: when you flush the kiln door closes and fires to 1000F automatically.
  8. Melanie: this article in CM will give you the basics on clay bodies. Direct link: https://ceramicartsnetwork.org/ceramics-monthly/ceramic-supplies/ceramic-raw-materials/techno-file-clay-body-shopping/
  9. B-mix (white stoneware) has 10-25% kaolin content- hence the "white." B-mix usually blends 50-60 mesh fire clay in lower %, which still allows for some body but without feeling any tooth when throwing. In addition, higher % of fine particle ball clay, with higher % flux= lower absorption values. But that also means higher COE values. (stoneware only application) you can use absorption data to help pinpoint COE values if none are given. To lower absorption: the body requires less large particle, more fine particle, with higher flux% in order to lower absorption: which means higher COE. conversely larger particle with less flux = higher absorption! with lower COE. ( generalization). Tom
  10. Spiffy: porcelain will always have a different feel than stoneware due to structure of kaolin clay. premium porcelain typically use premium plasticizers: macaloid or gums. Premium porcelain bodies have purer kaolin grades, premium plasticizers, and higher flux levels in order to achieve higher degrees of translucency. They typically have higher COE values for those reasons: Frost for example is 6.99 COE. Frost uses a gum ( not v gum) that creates that tacky feeling. Premium porcelain are off white to light buff in color. standard porcelain uses ball clay as a plasticizer: they can be tan to light grey in color. They fire to a high white, but little to no translucency. They are more user friendly starting out. COE bounce from 5.25 to 5.75 pending the amount of ball clay and flux. Buy according to cone rating. EX. Fire cone 6 to 6. Do not fire Cone 10 to cone 6. Porcelain is dependent upon flux levels to produce the glassy matrix that results in nearly zero absorption if fired correctly. Tom
  11. Tom: it is already broken down- just sat it in there to check space.
  12. Hi Moon- welcome to the forum. some pottery supply houses sell "china sand" which will work. Plain river sand will also work. River sand is also used by brick layers, also used in pool filters. If the edge is wide enough to support the weight, then yes. the other issue is quartz inversion which occurs at 1064F (563C) when firing large pieces, heavy pieces, or pieces with a lot of shelf contact: slow the firing down to 100F an hour from 1000 to 1100F. Do a forum search as "quartz inversion", I recall that thread from a few years back. Tom
  13. Leopold: large particle mesh does not suspend/disperse well in slip: so throwing would be a better option. If you are applying this slip over a clay body; while constantly stirring to keep them momentarily suspended, that would be possible. Mica changes from different deposits: so I cannot say with certainty that higher mesh size 50-80 would help, but theoretically I would think it would help. Mica is usually opaque, so I am curious about the source material. If the black color comes from iron, manganese: you will get your desired color. If it black from carbon, it will burn off at higher temps. I would have to assume this perticular mica source has been used for speckles before. Tom
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