Microwave kiln

A microwave kiln is a container kiln consisting of a base and hood made for use in a household microwave oven. The kiln is made of a white insulating fiber and lined on the inside of the chamber with a black compound that absorbs the microwave radiation and heats up to 1650°F.

The heat from this compound is then transferred to the chamber and to the piece being fired. It takes between 5 to 10 minutes to reach peak temperature ranges depending on the size of the microwave kiln, the work being fired, and the microwave’s wattage. After the firing, the kiln needs to cool for at least 20 minutes before being opened.

Designed for working primarily with small glass objects or precious metal clay, the microwave kiln is also suitable for firing small clay pieces, from beads and pendants to test tiles or small sculptural objects.

The optimum firing time for various materials and sizes needs to be determined through test firings.

Using the Kiln
First, cut a piece of kiln fiber paper to size. The fiber paper is usually provided as part of the kit, but can be replaced by pieces of Bullseye Thin-Fire paper used for glass work. The fiber paper prevents anything from sticking to the insulating fiber base.
Place your piece on the fiber paper and test fit the cover to be sure the piece does not hit the top or sides of the firing chamber. Place the base in the microwave and cover with the lid. Be careful; the black coating on the inside of the lid is delicate and cracks off easily if bumped. Set the microwave timer based on your tests. Once the microwave turns off, you’ll notice an orange glow coming from the vent hole in the top of the kiln.

Take the kiln out of the microwave immediately to prevent damage to the microwave’s ceiling from prolonged exposure to the heat from the vent hole. Wearing oven mitts or kiln gloves, grasp both the top and bottom of the kiln at the same time, taking care to not open it as you lift it up. Place the kiln on a heat resistant surface, like a brick or tile.
Leave the kiln closed for 20–30 minutes before opening. For slightly larger work, increase the cooling time to 35–40 minutes. The top of the cover and bottom of the base stay very hot for a long time, so keep at least a 6-inch clearance above and around the kiln. After cooling, gently brush the fiber paper residue off of the base with a soft brush.

Note: Wear a respirator to avoid inhaling the dust.

When using this kiln, follow the same rules as you would when firing work in a larger kiln. Clay objects can be fired either green or after a bisque firing. If firing green, the work must be thin and dry. Dry glazed work overnight before firing. Due to fumes, the microwave needs to be vented properly or fired outside.

It is recommended that you use a different microwave to the one you cook food in.

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