Free Glaze Chemistry Lesson: UMF Made Easy | Ceramic Materials Workshop

[@TheJojoaruba52]

Matt, you are a great teacher. Glad your instructional courses have gone international.

[@ceramicmaterialsworkshop]

Thanks Joe! I just heard the news about Hood. What a bummer. Hope you are doing well otherwise.

[@babivoliveira]

this just blew my mind, thanks for this video 🤯

[@JavierMartinez-mw4nc]

This is an incredible video! I took Glaze technology at my university and was completely confused with this section of glaze making! Thank you so much :D

[@matthewkatz7320]

Thanks Javier, Glad to help!

[@eddypenn]

how do you know its cone 10 from the umf?

[@boagyamsimpson2396]

Thanks to you, I am going to pass my ceramics exams

[@maxwellwhite]

Hello fellow MW! Great video, thanks.

[@TheJojoaruba52]

The UMF is no longer a mystery. Thank you!

[@gabiglaezer8685]

Thank you so much for this video! I am only starting to make my own glazes but predicting the outcome gives it a whole new perspective.

[@matthewkatz7320]

Thanks Gabi, Learning why our glazes work (and don't work) allows us to really take control of our work and our vision. Check out our video on Cone temperatures kzbin.info/www/bejne/f6LNi4itpLVmoa8 and if you want to learn more about how we predict glaze behavior, you can try our online workshop Glazed and Confused. app.ruzuku.com/courses/17968/about

[@gabiglaezer8685]

Matthew Katz thanks for the information! Can I ask if this UMF formula is the same as what they call the seger cone formula in Germany? And i am also wondering where i can get the chart you use for predicting the glaze. is that somewhere to print out or does it have a name?

[@matthewkatz7320]

It is the "american" name for the Seger formula kzbin.info/www/bejne/f6LNi4itpLVmoa8 You can download a version of the calculator with Stull's map at my website www.ceramicmaterialsworkshop.com/

[@EarthNationCeramics]

this is amazing. your one of the few people who understands and are helping me become a better glaze chemist, I have a question real fast. what part of the chart or numbers in the u.m.f tell me what cone the glaze is?

[@ceramicmaterialsworkshop]

Thanks! You can estimate firing temperature, but you have to consider all the values and how they work together. There are three major values that effect temperature. A) Higher levels of Alkali Metal flux, (over 0.3) I NEVER recommend this method for functional glazes. I have a video on NCECA's page talking about why. B) You can work with lower amounts of Silica and Alumina (which is hard to to as we require Si:Al to make the glaze) C) You can add a material that effects temperature. Namely Boron in a modern context. The exact amounts of Boron required for a particular temperature is something that I defined and published in my work from the 2012 NCECA journal. You can learn a lot more about the subtleties of understanding and reading the UMF with my online workshop. app.ruzuku.com/courses/17968/about We are going to publish a workshop specifically on temperature later this year. But we have another one on deck first.

[@alex-hp1ix]

Thank You for sharing this useful video, subscribed and eagerly looking forward to more!

[@vinayd8492]

Hey very informative!! Is there is any way to predict cone as well? Like cone 10 glaze will under fire for Cone04..

[@hanysammak311]

excellent , thank you dude

[@GizelleNel]

Lol devitrified sounds like a spell haha :D Thank you for the video! It is a huge help as I am taking a class is Ceramic Technology.

[@TheJmh19]

great video. unfortunately the glazy materials site doesn't list the ingredients or they moved the table somewhere else. does anyone know where I might find it? thanks

[@matthewkatz7320]

It is still there. It is just on the left side of the main page.

[@____Ann____]

I have a question about the chemical analysis of the raw materials. If I look them up at Glazy, do I choose Percentage analysis or 100% percentage analysis? For instance, when I look up Epk, the numbers are different.

[@shanikayeomans2488]

Thank you very much indeed for this absolutely loved it. Om in the UK. I would like to learn how to make my own glazes as im an absolute beginner to all this umf etc. How do I go about joining a course run by you please? Thank you very much

[@vishalrachna5813]

can you please tell what is ratio we need to maintain Silica: Alumina for cone 07 or cone 10, also what is the flux ratio for cone 7 also?

[@rebeccakimberling7720]

I understand the chart

[@grafkimber]

Where do I get that chart you used to calculate and That graph?

[@matthewkatz7320]

Hi Kimberly, Links are all in the description above, enjoy.

[@santotalukder]

Thank you so much😍

[@jakebanachak8116]

Shouldn't go past 1 maybe 2 Sig figs. How are you going to weight it

[@morganelouis-gobin666]

Hi Matt, thank you for this video. However I can't understand how the example based on a glaze recipe suitable for cone 10, with a 0,3 R2O : 0,7 RO ratio, can proove that Stull map (based on cone 11 and 0,3 K2O:0,7 CaO) works in anycase , whatever the firing temperature, and the R2O:RO ratio, and the nature of fluxes oxides used. Glazy.org indicates ("glazy help" section) "The Stull chart was created for glazes with a flux ratio 0.3 R2O: 0.7 RO and fired to cone 11. There may be variations in the chart for glazes with different flux ratios fired at different temperatures. The Stull chart does not show or predict firing temperature. So, just because a recipe point lies in the "Bright" region does not mean it will be a glossy glaze at your firing temperature." maybe I misunderstood the "predictive" side of the Stull diagram, as you mention it . Thank you if you can clarify

[@matthewkatz7320]

Minor firing variation (1 Cone) are well within the effective temperature range for a glaze. Cones them selves are just glazes with specific chemistries. Specifically variations of 0.1 Al and 1.0 Si is the difference between most of the cones at these temperatures. So what the map is showing us is variations in chemistry and temperature. Although the document is defined as only chemistry, temperatures is part of the system.

[@rebeccakimberling7720]

there is a clerical error on Fe2O3 bullet #7