... ,TiCN,CrN ,ZrN or other same kind coating with hard diamond Configuration :ZJP-300 Roots pump ,2X-70&2X-8 Mechanical pump ... Diffusion pump.The founction of multi-Arc Lon planting coated with TiN,TiCN,CrN ,ZrN or other same kind coating ... with hard diamond,which enhance the attachment with one another .This coating is also used ...