1. Type C digestive furnace adopts quartz infrared heating pipe, the radiation is primary and the conduction is auxiliary; short heating time, high efficiency. 2. Machine box adopts specially made plastic spray steel; working area adopts stainless steel materials,has good corrosion resistance. 3. Double-shell design, double thermal insulation effect with air thermal insulation layer and aluminum silicate thermal insulation layer. 4. Has multiple protection: over pressure, over current, overheating. 5. Small and beautiful, easy to operate, user-friendly. 6. Holes with 4, 8, 20.