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New or old furnace which don't used for a long time needs to be dry before it is used. The dry-temperature is from loot to 200 ℃. The large furnace S dried over a long period of time. You had better use other heating elements to dry the furnace to avoid Mosi, being oxidized in the low-temperature. After the furnace has been dried, please go up the furnace temperature in the following methods.