Tungsten Filaments and Tungsten Coils

The tungsten boats, baskets and filaments are manufactured from high grade tungsten. Of all metals in pure form, tungsten has the highest melting point (3422°C / 6192°F), the lowest vapor pressure at temperatures above 1650°C (3000°F) 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. Please see the Deposition Techniques Table for extensive information on vacuum deposition and suitability of evaporation sources.

3-Strand Tungsten Filament

Vacuum grade tungsten wire, 0.5mm (0.020") diameter, 89mm long (3-3/8"). The "V" is 12.7mm (1/2") deep, and has an included angle of 45°.

1-Strand Tungsten Filament

Vacuum grade tungsten wire filaments, 0.5mm (0.02") diameter, 64mm long
(2-1/2"). "V" is 12.7mm (1/2") deep, and has an included angle of 45°.

3-Strand, Tungsten Filament, 10 Coils

3 x 0.025" (0.635mm) diameter, 10 coils, 4" L (101.6mm), coil length 1" (25.4mm), 1/16" (1.6mm) ID of coil
Settings: 3.0V/42A/126W for 1800°C

3-Strand, Tungsten Filament, 4 Coils

3 x 0.025" (0.635mm) diameter, 4 coils, 4" L (101.6mm), coil length 1-3/4" (44.45mm), 3/16" (4.8mm) ID of coil
Settings: 3.43V/49A/168W for 1800°C

3-Strand, Tungsten Filament, 10 Coils

3 x 0.025" (0.635mm) diameter, 10 coils, 5" L (127mm), coil length 2" (50.8mm), 1/4" (6.35mm) ID of coil.
Settings: 8.05V/45A/362W for 1800°C

3-Strand, Tungsten Filament, 8 Coils

3 x 0.025" (0.635)mm diameter, 8 coils, 5" L (127mm), coil length 2" (50.8mm), 3/8" (9.5mm) ID of coil.
Settings: 8.72V/44A/384W for 1800°C

3-Strand Tungsten Filament, 6 Coils

0.025" (0.635mm) diameter, 6 coils, 1-7/8" l (47.6mm), coil length 1" (25.4 mm), 3/16" (4.8mm) id of coil.
Settings: 3.13V/44A/138W for 1800°C

3-Strand Tungsten Filament, 4 Coils

3 x 0.025" (0.635mm) diameter, 4 coils, 1-7/8" L (47.6mm), coil length 1" (25.4mm), 3/16" (4.8mm) ID of coil.
Settings: 2.3V/47A/108W for 1800°C

3-Strand Tungsten Filament, 6 Coils

3 x 0.020" (0.51mm) diameter, 6 coils, 2" L (5cm), coil length 3/4" (19.1 mm), 1/8" (3.2mm) ID of coil. For use with the Cressington 208C and 308R metal evaporation accessory.

Tungsten Wire Rod Source

Tungsten rod source with fine tungsten wire. This type of source is designed for applications where a relatively large amount of material needs to be evaporated with a lower power evaporation source. The fine tungsten wire accommodates more molten material than the standard single or three strand evaporation filaments. Suitable for low and medium temperature materials. The rod is 4" (101.6mm) long with a 0.1"(2.5mm) diameter. The 0.020" (0.5mm) diameter wire is wrapped in 8 layers over a 2" (50.8mm) wide length.
Settings: 1.12V/148A/166W for 1500°C

Chromium Plated Tungsten Rod

Chromium Plated Tungsten Rods are an alternative for Cr evaporation when only a low power evaporation power supply is available. 0.05" (1.27mm) W rod, plated with a 0.01" (0.25mm) high purity Cr layer.
Available in 2" (51mm) and 4" (102mm) length.

Settings for 2" L: 1.05V / 78A / 82W for 1800°C

Settings for 4" L: 2.02V / 78A / 158W for 1800°C

Molybdenum Foil

aperture cleaning, evaporation, experimentation

Evaporation Viewing Glass

impact resistant, 2 x 4-1/4" (5 x 10.8cm)

AWS shade No. 10