How to make a plaster slab for clay body testing | Ceramic Materials Workshop

[@torrettitorretti5574]

Thank you for such a clear step by step explanation.

[@floriangadsby]

Masterful demonstration - thanks for this guys!

[@shlembot]

Phenomenal. Thank you!!

[@Tiny_Island_Designs]

By using the same bucket with old plaster bits, even tiny bits, it will start to set your plaster much faster. You can use that to your advantage but it's best to be aware of it as your mixing time will be shorter. There is no reason to have a dedicated mixer for the drill as long as it it cleaned afterwards. I like having a bucket of water nearby to dunk tools into.

[@alans1816]

True. If you have trouble getting rid of bubbles, try mixing plaster in and with clean equipment. It will stay liquid longer, allowing bubbles to escape.

[@jaseczka]

What is the size of your slab? I'm thinking of making a plaster slab but I can't find how much I need to mix for the container I have.

[@ceramicmaterialsworkshop]

This is 16"x24"

[@waynep72]

Great video. I like the precise weights. I need to make me a good slab. Near the end you mentioned that there are 8000 grams of water that need to be evaporated out of the slab for it to be completely dry, but isn't a large portion of that water chemically bound with the plaster and will never evaporate?

[@ceramicmaterialsworkshop]

You are correct, we misspoke.

[@alans1816]

Only a little under 19 g of water becomes bound for each 100 g of dry plaster used. Whether that's a large portion is a matter of opinion.

[@Trixtah]

A vibrating device is excellent for getting bubbles out of a viscous solution - just run it around the outside of the tub. Obviously a reasonably large massage device is better than trying to use one's phone.

[@ceramicmaterialsworkshop]

Haha, don't endanger your phone. We do use a vibe table for ourselves. But we wanted to show how to make these for people with basic tools.

[@majadra4105]

. Good video, but . . . . Just a tip. The tone and volume of you voice goes up and down, to the point where some of your words are inaudible. The music's volume doesn't help either. I would suggest that you turn the music down a little, while speaking up a little too.

[@mhsmhs3190]

The transcript does not even follow what you’re saying. Can I just get a formula how many cups of plaster to how many cups of water? Why does this have to be so difficult?