Our Sigma company was found in Luoyang city at the year of 1996. We are specialized in research and design, manufacture, and sale all kind of muffle furnace series. Up to now we have got about 20 pieces of patent technologies and the intelligence properties. Our products are including the chamber furnace series, the tube furnace series, the elevator furnace, the industrial furnace, the Induction furnace series and the components etc. Besides the ordinary products we can also manufacture the high temperature range 1800-2300 degree Celsius muffle furnace. As the manufacture we can provide the...