MTI corporation provides the high-quality Alumina (Al2O3 ) foam block for high-temperature tubing furnaces in universities, companies, and national labs. It comes with the specifications as the following: Max. working temperature: < 1700ºC Diameter: 70 mm (2.76") ± 2mm (0.08") Length: 50 mm (2") ± 2mm (0.08") The blocks must be put between the sample the and flange. Fit MTI'sGSL1600-80X Bench-top High-Temperature Tubing Vacuum Furnace and GSL1700-80X Bench-top High-Temperature Tubing Vacuum Furnace. Application Note: To prevent dust falling issue and ensure a cleaning process, it is suggested to apply a thin layer of alumina adhesive material on the surface of the foam block. Please click underline to order. For direct delivery of precursor gasses over the heating zone, customer may drill a hole in the alumina block for sticking a 1/4" O.D. quartz (