Glaze Thickness or Specific Gravity (Free Online Glaze Course Part 20 Lab)

This is a short video showing how to measure glaze thickness or specific gravity.

[homs.]

Thank you for your generosity. You are a great teacher! I am so blessed!

[jackiesedlock]

This is very helpful. Thanks for sharing this information, John.

[juliankent]

A very easy to understand explanation. Many thanks

[esthermcnaughton]

Terrific. Thanks for making it so easy to understand!

[melissamead]

Great video- thank you. Can you help me with some questions please? Would you have any test tile examples of what happens when your gravity is high or low? How do water soluble materials affect sp.gr.? In you experience -if the spgr is too low is it better to pull water off after the glaze settles or to add 100g more of the dry glaze recipe?

[tumblestack]

Hi John...
Where did you get your hydrometer and what type is it?
Thanks for all you do!

[ClownWhisper]

with the syringe, it doesn't make sense to me ...
you zero the scale draw in 50ml put it on the scale, it read 77 or then you said so that's about 154 lol. you double it? you left out how you get to 154

[danieljaureguigomez]

Hi John,

I’m trying to reduce the viscosity of a mixture of Silica Flour (90%) and light burned MgO (10%) could you recommend some way to do it without adding more water ?

Thanks

[TheJmh]

the question I have is there (if you are mixing your own glazes) an average glaze gravity for say mid fire glazes? Example: most glazes call for a gravity between 1.8 and 3.6. or what ever the number is. that way I could start with gravity and work my way back.
hope that makes sense