... Parameter: Model and MainTechnical Parameters of VAKIA-OEC Series Vacuum Optical Coating MachinePerformance/ModelVAKIA-OEC-900VAKIA-OEC -1200VAKIA-OEC -1350Size of ... -800 , Roots pump ZJ-600, mechanical pump 2X-70, rotary pump 2X-8, 304 stainless steel pipingDiffusion pump KT-800 ... , Roots pump ZJ-600, mechanical pump 2X-70,rotary pump 2X-25, 304 stainless steel pipingunlimited vacuum: Superior to ...