Baking Cores

Home enthusiasts discuss their Foundry & Casting work.

Moderator: Harold_V

Post Reply
Posts: 208
Joined: Thu Feb 23, 2012 6:07 am

Baking Cores

Post by jlakes85 » Thu Jun 13, 2019 6:29 am

Hi All,

I baked my first cores in the oven, but made the mistake of not using a dead flat pan/surface. I was thinking about using a pizza/baking stone to make sure everything sets right. Are there any better alternatives?



Posts: 555
Joined: Sun Oct 26, 2003 7:27 am

Re: Baking Cores

Post by RONALD » Thu Jun 13, 2019 9:47 am

I have never baked a core, I use the CO2 (Carbon Dioxide)- Sodium Silicate method for making cores.

It's a "Cold Box" method and requires no heat. There is no toxicity/fumes associated with this method.

I usually will mull 400 milliliters of Sodium Silicate with 25 pounds of sand. I use AFS 105, but any sand should work.

Can be stored for many weeks in a sealed container, but eventually it will harden by itself if not hardened by CO2.

Look up the method on the Internet, lots of info available.

Posts: 265
Joined: Wed May 14, 2014 12:28 pm
Location: Delaware

Re: Baking Cores

Post by DavidF » Thu Jun 13, 2019 10:17 am

and if gassing the SS bound core just is not your thing, you can buy a catalyst to cure it here.

Posts: 208
Joined: Thu Feb 23, 2012 6:07 am

Re: Baking Cores

Post by jlakes85 » Thu Jun 13, 2019 11:35 am

I have a 2 part resin system I'm using already. Baking is optional but I dis it to harden them up even more. I screwed up in using an old baking pan which wasn't dead flat. I was hoping there were oven safe surfaces/slabs that are good to use to maintain a true surface while baking

User avatar
Posts: 520
Joined: Sat Jan 04, 2003 10:28 pm
Location: Walnut Bottom, PA, USA

Re: Baking Cores

Post by Bill_Cook » Mon Jul 29, 2019 12:22 am

The cores that get baked in the foundry I work in are baked on what appears to be clay slabs. They are heavy and brittle. I wonder if ceramic tiles would work.

If there was only one way to do each machining job, the smell of sulphurized cutting oil smoke would have fewer fond memories.

User avatar
Posts: 775
Joined: Sun Dec 08, 2013 1:40 pm
Location: southern Portugal

Re: Baking Cores

Post by liveaboard » Mon Jul 29, 2019 2:50 am

My wife is a ceramic artist; a kiln shelf is a flat slab of refractory ceramic that stays stable and stiff through high temperatures and is made to cycle many times.
They seem to be very flat; I don't know if you mean machinist flat, I haven't ever checked them.

They're inexpensive and available from refractory supply shops.

Post Reply