Compared to 95% alumina, 99% alumina have high dielectric constant. Features of this material: Exceptionally high dielectric strength Consistent dielectric constant Dense, non-porous and vacuum tight Readily accepts moly-manganese metallizing for high temperature brazing Electrically and dimensionally stable across a wide temperature range Resist chemical attack and abrasion Good thermal conductivity Metallization : Moly-Manganese metallizing +Ni plating Applications: Medical X-ray tubes Vacuum feedthrus Vacuum Interrupter Ceramic to metal seals Filaments Assemblies