As I had task not to spend time for trials with corundum-phosphat combinations, but to really spare time by using of ready components, I used the ready heater of company YASAM and his coupling device – ceramic muffle.

Heater: fechrale, wire`s diameter 1,5mm, there are studs (d= 3mm) welded to output ends. Resistance is 5 Ohm. Muffle is not necessary because inside of heater – the wires are without coating. Dimensions of heater: D=60/50x124mm. dimensions of muffle: D=54,5/34x130mm. You should make a hole in muffle`s bottom for studs` lifting.

Make housing of melting device from common stainless steel pipe D=220/200, turned until required thickness of walls is achieved. I didn`t taken the height value randomly. As we will have grog brick as felting, height includes 3x thickness value of brick.

Felting of oven si made of grog brick of type SHL0,4 or SHL 0,6 of size #5. His dimensions are: 230x115x65mm. Muffle is processed with saws and sand papers. I guess you will have to change saw very often :)

Straight sipes are to be made by saw for wooden, for curved sipes – I used self-made saw from saw plate with large teeth, with reduced (abrased) plate`s width.

While manufacturing of felting you have to keep the following rules:

- Don`t use any mortar for fixing of parts. Everything should be dry. Anyway it will destroy it

- Please avoid contact of the parts of felting to any other parts, ther should be gaps and no tension

- Large parts of felting (if you will make it from other materials) – it`s better to divide it on small parts, anyway it will be cracked. That`s why it`s better if you will do it by yourself.

Please make hole for thermocouple in third ply, making gap in first and

second ply between heater and felting. Gap should be so minimal that thermocouple will hardly slide in hole, located as near as possible to heater. You can buy thermocouple on YASAM-market, but I prefer the self made one. Not because I`m greedy (although they are of high price there), but specially leave uncovered soldering area for better heat contact. But in this case you have risk to burn incoming circuits of controller.