Hot box set up

[mzombek]

I am in the process of building a hot box. I bought the thermostat from Bingham projects. Not sure what the high temp is before the thermostat shuts off. What is a good insulation to use inside of the box that can handle the heat.
Thanks for you help.

[Noah70]

I never insulated the interior of the box, I lined all surfaces with heavy duty foil. Then gave a light coat of spray foam to the outside, not enough to make it bulky, about 1/2”. Seems to hold the heat well and the Bingham thermostat cycled as needed. I use a different method now, but the box performed very well too.  Good luck!

[kennym]

My heat box is always in the way, so next one will be 1/2 or 3/4 " foil faced both sides foam made into a folding box with no bottom and the heat source on a piece plywood on top. Set it on concrete floor and put the lid on and go...

Then I can take it down and store it easy. Mine takes up waaay too much shop space.

[Kirkll]

You really don't need insulation on those things, but the foil back foam holds up well under heat until you tear it up... I used 4 - 200 watt light bulbs on mine and have an adjustable thermostat. The old binghams thermostat shuts down at 160 degrees i believe..... i only use mine in winter for curing riser block lay ups.

[Sam Harper]

Foam board insulation is cheap and easy to use. One time I made a hotbox with just foam board insulation - no wood. I taped it all together with metal tape.

[Mad Max]

I used this but my box is big and deep

https://www.lowes.com/pd/Reflectix-R-21-50-sq-ft-Unfaced-Reflective-Roll-Insulation-24-in-W-x-25-ft-L/3011904

[Mad Max]

You really don't need insulation on those things, but the foil back foam holds up well under heat until you tear it up... I used 4 - 200 watt light bulbs on mine and have an adjustable thermostat. The old binghams thermostat shuts down at 160 degrees i believe..... i only use mine in winter for curing riser block lay ups.

I think it is 185 to 150

[Kirkll]

You really don't need insulation on those things, but the foil back foam holds up well under heat until you tear it up... I used 4 - 200 watt light bulbs on mine and have an adjustable thermostat. The old binghams thermostat shuts down at 160 degrees i believe..... i only use mine in winter for curing riser block lay ups.

I think it is 185 to 150

You know something.... you may be right about those Binghams thromotats being 180-185 shut off. I had my temp set at 160 with my adjustable set up.

[derekdiruz]

Mine is mildly foil lined (half torn off by use). And I’ve got a temp controller set on mine for 150 at the height of the glue up. Mine does have the binghams temp controller thing on it up top- but I noticed it was kicking the bulbs off at 110-114° at the height of the glue up. So I added the ink bird for a few reasons, one to bypass that switch.

Soon I plan to add a fan- just to ensure the heats distributed.

[goobersan]

Mine is insulated with foil lined foam, foil facing in. Never had any issues. I do recommend a fan along with Ceramic tiles to protect the form from any Hotspot. With those additions I only needed 2 bulbs on to maintain temp.