Sigma muffle furnaces are applied to Colleges, Universities and Research institutions, process the sintering of cermet material and ceramic material, heat treatment of some monocrystal, refractory material reheat shrinkage researching under high temperature, and used for small batch production. Muffle furnace features: Operation Temperature: 950? (1000? for short time). Furnace chamber adopt vacuum forming technology, furnace wire embedded in the inner surface of ceramic fiber furn