leek- või elektriahi, kus kuumutatavad tooted asetsevad muhvlis
a furnace provided with a lining of ceramic or other refractory material, which prevents direct contact between the charge and the fuel or heat source. Muffle furnaces with electrical heating elements are used extensively in laboratory work.
resistance chamber furnace with a thin wall part inside the heating chamber of a resistance furnace, designed to separate it from the heating elements and wall lining
Place the crucible in a muffle furnace and ash to constant weight (loss in weight between two successive weightings must be less than or equal to 2 mg) at 475 oC to 500 o C for at least 30 minutes.
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In the laboratory, muffle furnaces are used for drying solids, sintering, and studying high-temperature reactions. They typically operate in the range 100–1200°C.
Method of determining the ash content of flour ... 2. Immediately before use the dishes must be heated in the muffle kiln at incineration temperature to constant weight; a period of 15 minutes is usually sufficient.
