FAQ: How do I build a hot box oven for heat curing materials?
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How do I build a hot box oven for heat curing materials?

How To Build a Hot Box
We’ve come up with a way to easily build a cheap “hot box” to any size you want.  Our design will create convection currents and maintains constant temperatures, resulting in even heating of materials which is exactly what you need.  The foam board and other materials needed to build the hot box can be found at Home Depot or other DIY stores.

Materials And Tools
2” (5 cm) Foil Insulation Board
1” (2.5 cm) Drywall Screws
Glass Thermometer
Duct Tape
Table Saw & Jig Saw
Drill With 1” Hole Saw, Screwdriver Bit, and ¼” Drill Bit

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1 - The foil-backed is cut to size carefully on a table saw.
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2 - 1” (2.5 cm) screws are used to assemble the box.
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3 - A jig saw is used to cut a port in the front panel to accommodate the blower end of the heater.
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4 - Multiple vent holes are added into the sides of the box. They are sealed with duct tape and can be later opened/closed to vary and control the temperature.
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5 - A 1/4” hole is drilled for the thermometer, which is needed to monitor temperature. Thermometers can be purchased through a scientific equipment supply house.
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6 - A mold is placed in the center of a base board, which insulates the mold from the concrete floor. Note: DO NOT place the mold or casting directly on a wood floor, table etc. Only use the Hot Box on a concrete floor or slab.
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7 - The heater is fit into the box port. This heater produced an ambient temperature of 203°F (95°C) in 5 min.
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8 - Monitor temperature while heater is operating.
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9 - The temperature can be controlled by adding or removing duct tape.

The FAQ list is offered as a guideline and offers possible solutions to problems encountered during mold making and casting. No warranty is implied and it is up to the end user to determine suitability for any specific application. Always refer to the provided Technical Bulletins (TB) & Material Safety Data Sheets (MSDS) before using any material. A small scale test is suggested to determine suitability of any recommendation before trying on a larger scale for any application.

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