Upper graphite heat sheild can protect the device from damage and contamination in graphite hot zone.It requires advanced processing tecnologies and high quality graphite materials.The high mechanical stregth graphite can avoid cracking during 

the calcination.

The produce can reduce heat loss and energy consumption. It has sufficiently high strength and good thermal shock resistance.

Bottom graphite heat shield plays the role of protection and insulation in the graphite  thermal field , It requires advanced processing tecnologies and high quality graphite materials.