SYLVANIA Tungsten Rod is manufactured by powder-metallurgical techniques.  Hydrogen-reduced tungsten powder, produced by SYLVANIA to rigidly controlled purity, particle size, and size distribution is consolidated by pressing and sintering into billets, which are worked by rolling or swaging into rod. Smaller sizes are produced by subsequent drawing.  The rod is furnished in straight random lengths with a smooth swaged surface at diameters 0.119” to 0.625” and with a smooth drawn finish below 0.119”.  A centerless-ground finish can also be furnished.  Specific lengths and special fabrication, such as beveling, pointing, and step grinding will be supplied upon request. 

For more information see our Technical Information Bulletin...

SYLVANIA also offers Large Diameter Tungsten Rod available with a diameter range of 0.625” to 2.000” in the following types of materials: pure tungsten, potassium doped tungsten (VM grade) and tungsten lanthana. 

For further information on large diameter tungsten rod, see SYLVANIA’s Technical Information Bulletin on Large Diameter Tungsten Rod (0.625” to 2.000”)...

Pure Tungsten
Fine-grain tungsten rod is 99.9% pure tungsten with a fine-grained worked structure.  The material has wide general usage for automotive ignition contacts, heaters and supporting members in electronic tubes, mercury-switch contacts, hard-glass leads, and high-temperature furnace elements.

1%-Thoriated Tungsten Rod
Contains 0.8 to 1.2% thoria.  Its principal use is for power-tube emission filaments and for electrodes for TIG welding.

2%-Thoriated Tungsten Rod
Contains 1.7 to 2.3% thoria.  Its principal use is in TIG welding electrodes.

1 & 2% Thoriated Potassium Doped (VM Grade) Tungsten Rod
Contains 15 to 45 ppm potassium.  Its principal use is in the lighting industry, particularly as cathode material in high intensity lamp applications.

Potassium doped tungsten rod (VM grade, J) 
Contains 15 to 45 ppm potassium.  Its principal use is in the lighting industry, particularly as anode material in high intensity lamp applications.

Potassium doped tungsten rod (lighting grade, NS, AK) Contains 50 to 70 ppm potassium.

Tungsten 1.3% Lanthana Rod
Contains 1.1% to 1.6% lanthana (La2O3).  It is an alloy of 98.7% pure tungsten with 1.1% lanthanum (1.3% lanthana) with a find-grained worked structure. 
 

NOTE:  SYLVANIA tungsten inert-arc-welding electrodes are stocked and sold through all leading welding distributors.  For information contact your local Sylvania Welding Distributor.