This is how you can build a small high temperature furnace for craft projects.
Things You'll Need
- Furnace Cement
- Propane Torchs (2)
- Piece of Boilerplate
- Welder's Glass
For many purposes it is nice if you have a high temperature furnace available for a number of purposes, but an off-the-shelf furnace is costly. This furnace can be readily constructed from materials that are mostly available from your local building supply store. They are firebrick, furnace cement and a propane torch.
This is a small device that should be used on top of a metal plate. It is constructed from firebrick that is cemented together with furnace cement. If you can't buy furnace cement you can make your own using wood ashes mixed with an equal amount of salt mixed with water to form a paste.
It is put together like any other small structure made of bricks. The door is left open, and in use it is closed by piling firebricks up in front. Two holes are cut into the rear of the furnace to accommodate two propane tank nozzles.
In use the nozzles on the propane tanks are lit and the ends of the lit nozzles are shoved into the holes that were made for them. Temperature can be roughly controlled by adjusting the size of the flame coming out of the nozzles.
Some objects can be fired in this furnace by placing them directly on the floor of the furnace. Other objects have to be placed into crucibles that can be bought from a laboratory supply house. The same source can be used for a high temperature heat coupled thermometer if desired.
Another temperature control source is so-called ceramic cones used in the pottery business for temperature control. These cones slump at specific temperatures giving you some indication of how hot it is inside your furnace. They can be bought at a ceramics supply or craft store.
A small eye hole should be made in one of the bricks used for the door. When the furnace is on operation you should not look directly into the furnace without some dark glass used to protedt your eyes. This kind of glass can be bought from a welding supply store.
Larger furnaces can be constructed using this method it all depends on how large you want your furnace to be. Electric heating elements can be used in the place of propane flames to provide the necessary high heat.
You can use your imagination in designing a furnace specifically for your needs. This is the basic form that all furnaces are made from.
Tips & Warnings
- The whole furnace is about 12 x 12 x12 inches.
- The furnace gets very hot with use.
- Don't look directly into the furnace when it is in operation, use welder's glasses.
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