ceramic insulated tube order instruction: OD,hole size, ... sure,pls inform usage high temperature Ceramic insulated alumina tube Application:Our ceramic tube are mainly used as thermal ... % alumina,95%alumina,99%alumina,99.7%alumina or Zirconia , corundum Available sizes:Dia of the tube: from ... to 620mmLength of the tube: from 1mm to 3500mmAlumina ceramic tubeorder instruction:OD,hole size,Qty of holes, ...