Small tungsten evaporation boat with 4.76mm x 1.6mm dimple

The tungsten boats are ideal for evaporation. Made from high grade tungsten. Of all metals in pure form, tungsten has the highest melting point (3422°C), the lowest vapour pressure at temperatures above 1650°C and has the highest tensile strength. Tungsten also has the lowest coefficient of thermal expansion of any pure metal. This combination of properties makes tungsten the ideal material for evaporation sources. During evaporation, it can alloy with some materials such as Al or Au. In this case, another evaporation source material should be used such as alumina coated boats or baskets. Other materials useful for evaporation sources are molybdenum and tantalum. 

Specifications:

• Boat size is 47.6mm L x 6.35mm W
• Dimple is 4.76mm diameter x 1.6mm deep
• Tungsten thickness is 0.127mm
• Settings: 1.69V/80A/135W for 1800°C