GPK Cupelling Kwik Kiln

The Cupelling Kiln differs from the Melting Kiln, in that, the diffuser – the top section of the combustion chamber that is jacketed with stainless steel – is chamfered. The chamfered edge is designed to open the flame exiting the kwik kiln and expose the cupel and burning lead to atmospheric oxygen, thereby allowing the conversion of metallic lead to Litharge, which is then absorbed by the cupel. The diffuser chamfer has to be the correct angle for this to occur. It also has to be ridigized for durability. This chamfered edge also allows the stainless steel mini tongs to more easily grab and remove the cupel from the chamber after firing.

The cupel kwik kiln does not have a ‘spacer’, which is needed to melt.

GPK Melting Kwik Kiln

The Melting Kwik Kiln has a straight/vertical chamber. It also includes a spacer – the round piece of refractory material without a stainless steel cover that is set on top of the chamber when melting with a graphite crucible inside. The mini graphite crucibles are custom made for the kwik kiln. Other sizes will not fit properly.

GPK Hybrid Kwik Kiln

The Hybrid Kwik Kiln combines both cupelling and melting properties. It has a chamfered chamber for cupelling and a spacer for melting.


The alumina silica refractory material of GPK gold processing kilns is good for up to 2300 degrees Fahrenheit. Once the material reaches the targeted melting temperatures, the refractory material will shrink approximately 5%, which will create small cracks in the material when it cools. However, cracking is not detrimental to the operation of the kiln or the life expectancy of the kiln.


The GPK Kwik Kiln is designed to be heated with 2 pencil tip PROPANE torches simultaneously. Mag-Torch MT-200 pencil tip torches are highly recommended by our designer, for being more stable.

Please note: We cannot warranty any GPK Kwik Kiln heated too high, improperly, or in a manner that goes against their design. This includes using other types of torches, or using Mapp gas, which gives off more heat. We recommend using propane only.


No guarantee is given regarding the amount of gold, silver, or other precious metals obtained from this process, as it depends upon the quality of your materials to begin with and your own skills. These are kilns that may ultimately generate temperatures in excess of 2200F degrees. Use at your own risk and follow all recommended and common-sense safety precautions. The kiln and kit materials are not toys and are not to be used by children. Sellers are not responsible for accidents or injuries caused by hot kilns or the contents thereof. Using one purchased from this seller acknowledges that you use it at your own risk and are fully aware of all hazards associated with using the kiln and the process of melting metals.