fireguy: Thank you for your answer. I had a contact with the company, but they said that the specific furnace does not have the ventilation needed, and that could melt the material of the chamber.
I had a look through the internet and I found the following, of which I don't really understand the difference. I know that the typical muffle furnace is not suitable, but why you need different furnaces for each procedure?
Assay furnace :Heating elements siliconit, temperature 1300 ℃, equipped with digital display temperature controller (Brand Name: BH Code: SX2-8-13)
Cupellation furnace:Heating element furnace wire,the temperature is 1000 ℃, equipped with digital display temperature controller (brand name: BH,Code: SX2-8-10 )
I am looking forward for any answer. Thank you in advance.