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.