Advantages and Disadvantages of UMF Unity Molecular Formula ( video 23 in FREE Online Glaze Course)

This is an in depth exploration of the advantages and disadvantages of the UMF (Unity Molecular Formula) in ceramic glazes, using melt flow tests, tiles and a color blend. Part of the FREE ONLINE GLAZE COURSE.
**The final results of 10 variations all with the same UMF was that 2 were very close in melt and color response (#2 and #6). 4 were completely off in every way (# 4,5,10 and 11). In the drip test, #7,8 and 9 were good but color was off. Finally the test with Silica mesh size variation using amorphous silica was a nice promising glaze ...not exactly like the original but showing that using amorphous silica in other recipes could be a good idea.
I mess up and forgot to put 26.33 grams of Frit 3124 in Recipe#5. You can see the recipes on my Glazy.org page: glazy.org/u/jo...

[@beckypots1]

All this info for free, I can't imagine the time involved. Thank you for sharing your vast knowledge of glaze chemistry!

[@NILESHUKANI83]

This is excellent information, thank you for taking the time to do all these tests!

[@myriambernier1123]

Thank you so much for sharing Your knowledge John!

[@vibhabudhraja]

I'm fortunate that I'm learning free online glaze course from you. Thanks so much for sharing your deep knowledge of glazes and glaze materials with us 😊

[@barbarabrown7891]

Love this!. Thanks John.

[@z.4085]

Thank you so much for every information..I'm always looking for these kind of lessons

[@johnbrittpottery]

Got 31 videos in the FREE ONLINE GLAZE COURSE on this channel

[@KatValenzuelaArt]

This is excellent information , well researched and tested. This proves that the unit molecular formula can be a starting point, but that tests are still needed to further investigate what we want to achieve.

[@daxgaz]

This is excellent information, thank you for taking the time to do all these tests!

[@jeangarry8189]

I imagine your supply room is HUGE

[@jeangarry8189]

OH MY GOSH!

[@jeangarry8189]

Amorphous silica?

[@maggiejones2092]

@@johnbrittpottery Why frit a silica? Never heard of it.

[@johnbrittpottery]

I said that poorly. It it basically very very fine silica. Imsil A-25 sold by Axner and many others. Use to get more silica into the melt faster. You can Google it and read more.
www.axner.com/silica-imsila25.aspx

[@johnbrittpottery]

@@maggiejones2092 I said that poorly. It it basically very very fine silica. Imsil A-25 sold by Axner and many others. Use to get more silica into the melt faster. You can Google it and read more.
www.axner.com/silica-imsila25.aspx

[@DirtyBottomsPottery]

Makes me want to do a line blend for a melt test using the two different mesh sizes of neph sy. Would it be possible to fine tune the appearance of a glaze, shiny to satin, possibly even matte, with manipulation of mesh size alone?

[@johnbrittpottery]

Generally you can make a satin glossy by adding finer silica. But would be a good test. Best way to go from. Shiny to satin is the E3 cycle...slow cool. It doesn't work on all glazes but ones with is with calcium magnesium titanium et cetera