These hga graphite tubes are pyrocoated to provide improved sensitivity and tube-to-tube reproducibility. They are slotted to accept lvov platforms, PerkinElmer part number B3001256. PerkinElmer has over four decades of experience in the design/development of graphite furnace systems and materials. The proper performance, maintenance and serviceability of our graphite furnace systems can be assured only through the use of genuine PerkinElmer supplied graphite components such as these graphite tubes.