VAC AERO offers both all-metal and graphite-based insulation packages in our vacuum furnace hot zones. Some furnace manufacturers and heat treaters will tell you that vacuum brazing can only be performed in furnaces with all-metal hot zones. VAC AERO has proven this to be entirely false. For more than 10 years, our own heat treating facilities have been brazing difficult-to-join materials like superalloys in properly maintained vacuum furnaces equipped with graphite insulation and heating elements. In fact, we’ve found that graphite insulation offers many benefits over metal insulation for certain brazing applications.