Alumina coated tungsten boats, dimple 12.7 x 3.2mm

Replaces alumina crucibles for some specific applications. Good heat transfer yet has alumina inertness. Evaporant does not wet the alumina: no resistant change of the boat when evaporant melts. Due to the non-wetting characteristic, the evaporant forms a sphere when melted, resulting in a point source.
Boat 101.6 x 12.7mm, dimple Ø 12.7 x 3.2mm deep.
Melting point of tungsten boats with coated Al₂O₃ tabs: 3422 deg. C.