aeva
i wonder if #plaster is oven safe, and how well it works with #polymerclay? might be useful for creating support surfaces for irregular polymer clay shapes, or an alternative to foil for interior structures
Mar 26 at 4:00pmWeb
Show threadWee Mad Hamish3d ago
@aeva It won't catch fire, if that's what you're worried about. Plaster of paris is derived from gypsum, it's a calcium compound of some manner. But it is partially made of water, and might weaken or crumble if you get it hot enough to drive the water off.
Potential for a small steam explosion if you wrap it completely in polymer clay, but otherwise shouldn't do much at clay baking temps.
Show threadEmily Velasco3d ago

@aeva plaster should be ok in the oven. It just begins dehydrating at high temperatures, but it's not destroyed. When i did bronze casting, we used plaster molds baked until they were fully dehydrated and the wax model they contained was burned out.

That said, the water being driven out of its chemical structure needs to go somewhere and i don't know what that will do if it's trapped inside polymer clay

Show threadaeva3d ago
@MLE_online gotcha. I wonder if punching holes in the polymer clay will be sufficient
Show threadEmily Velasco3d ago
@aeva Maybe! Time for some tests
Show threadaeva3d ago
@MLE_online to the bus!
Show threadEmily Velasco3d ago
@aeva Hop in!
Show threadaeva3d ago
@MLE_online :D
Show threadKrzysztof Sakrejda3d ago

@aeva it'll dehydrate at those temperatures and become brittle and probably fall apart, regular clay might work better

edit: ... if you do use regular clay for this just make sure it's dry before it goes in the oven...

Show threadideaPDish3d ago

@aeva

props!

It can work, but be sure to dry it out in an oven below 100c, until it becomes moisture free. Otherwise it could crack from steam pressure.

The key feature that makes plaster bats useful in clay art, is that it absorbs water. Use for too wet clay.

Mix with very fine silica sand is used as an investment medium for lost wax casting in jewelry. So, it can take heat.

Show threadaeva3d ago
@ipd excellent :D ty ty
Show threadideaPDish3d ago

@aeva

That's why I'm in the metarial world, to understand material. oh yeah, and I was born a while ago.

Show threadaeva3d ago
@ipd i love materials
Show threadideaPDish3d ago

@aeva

Sew?

Show threadideaPDish3h ago

@aeva

I remember casting.... Then there's this..

https://hackaday.com/2022/10/30/stop-silicone-cure-inhibition-no-fancy-or-expensive-products-required/

Stop Silicone Cure Inhibition, No Fancy Or Expensive Products Required

Casting parts in silicone is great, and 3D printing in resin is fantastic for making clean shapes, so it’s natural for an enterprising hacker to want to put the two together: 3D print the mol…

Hackaday