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Tungsten


Atomic no.:
74
Atom. weight: 183.84
Density: 19.25
Class:
refractory metal
Melting point: 3410°C
Boiling point: 5657°C
Colour: Array
   
Discoverer: Carl Wilhelm Scheele
Place: Koping, Sweden
Year: 1781

Tungsten was isolated in 1783 by J.J. and F. Ehuijar in Vergara, Sweden. Tungsten metal is lustrous and silvery white in color, and does not occur naturally (it has an abundance of 1 ppm in the earth's crust). It is found in the ore Wolframite, a tungstate of iron and manganese, (FeMn)WO4, which is converted to the trioxide and then reduced to the metal by reduction in hydrogen (carbon cannot be used as the very stable carbide would result). Tungsten metal is relatively inert, resisting attack by oxygen, acids and alkalis, although it will react with fused, oxidising alkali media. It has the highest melting point of all metals and, when pure, it can be worked with relative ease; however, the presence of impurities renders tungsten extremely brittle and, therefore, difficult to fabricate. The high melting point of tungsten makes it suitable for use as electric filaments (e.g. in electric light bulbs). It is also the basis of a range of alloys containing tungsten, copper and nickel which are used for radiation shielding as they provide a 50% increase in density compared to lead. Tungsten and its alloys also find uses in military applications (e.g. armour and shells), as well as counter-balance materials. Tungsten carbide powder (with possible additions of titanium and tantalum carbides) along with nickel or cobalt powders, are compressed and sintered to produce cemented carbides. These products are used in place of high speed steel to form the tip of cutting and drilling tools, or for parts which will be subjected to heavy useage.

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 Ultra Pure E-Beam melted tungsten 5N - 11.02g  Art. Nr. 001813  
Ultra Pure E-Beam melted tungsten  5N - 11.02g
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Ultra-Pure Tungsten 99,999%
Electron-Beam melted from SINGLE CRYSTAL!


Only such material can reach the theoretical density of 19.25g/cm3 and are very rare and practically only available here!

These are our last electron beam melted beads!

Amount: 11.02g
Purity : 99.999%
Packing: PE-bag
96.00
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 Ultra pure Tungsten single crystal ~99,99% purity! 56g  Art. Nr. 001602  
Ultra pure Tungsten single crystal ~99,99% purity! 56g
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Sensational tungsten single crystal rods
Length ~ 40mm - Diameter ~10mm
Orientation: unknown. Weight: 56 - 57 grams

You get ONE piece of the crystals shown on the picture!

This single crystal was made by zone refining process and was cut by EDM into 40mm long fragments. This is top quality at a sensational price!

Amount: 1 St. /1 pc.
Purity : >99,99%
Packing: PE - Foil
130.00
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 High purity tungsten foil 80x100x0.05mm 99,95%  Art. Nr. 001419  
High purity tungsten foil 80x100x0.05mm 99,95%
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High purity Tungsten foil 99,95%

0.05mm thickness!

For Laboratory, high temperature applications etc.
Size ~. 80mm x100mm - weigth ~ 7.5 grams

The picture shows a larger foil.

Amount: 1 St. / 1 pc.
Purity : 99,95%
Packing: PE-bag
20.00
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 high purity tungsten pearl - 1.88g 99.95% purity  Art. Nr. 001698  
high purity tungsten pearl - 1.88g 99.95% purity
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High pure tungsten metal pearl - 99.95% purity
Arc melted !!!

Size ~ 6.5mm -These unique pieces of melted tungsten are very rare and difficult to produce due to its high melting point of more than 3410 degrees C.!

Amount: 1.77g
Purity : 99.95%
Packing: PE-bag
25.00
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 High purity E-Beam melted & macro etched tungsten 5N 71.86g  Art. Nr. 000603  
High purity E-Beam melted & macro etched tungsten 5N 71.86g
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Ultra-Pure Tungsten 99,999%
Electron-Beam melted and macro etched !!!

Only such material can reach the theoretical density of 19.25g/cm3 and are very rare and practically only available here!

Amount: 71,86g
Purity : 99.999%
Packing: PE-bag
336.00
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 High purity sintered & ground tungsten rod 99,95%  Art. Nr. 000446  
High purity sintered & ground tungsten rod  99,95%
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High purity sintered & ground tungsten rod

Not like cheap electrode material. Length ~ 55 - 65mm - Diameter 0.1" (2.5mm)

For your elements collection, for high temp applications, laboratory etc.

Only 1 piece left

Amount: ca. 5,5 - 6g
Purity : 99,95%
Packing: PE-Beutel
10.00
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 high purity tungsten pearl - 1.76g 99.95% purity  Art. Nr. 001700  
high purity tungsten pearl - 1.76g 99.95% purity
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High pure tungsten metal pearl - 99.95% purity
Arc melted !!!

Length ~ 7.5mm -These unique pieces of melted tungsten are very rare and difficult to produce due to its high melting point of more than 3410 degrees C.!

Amount: 1.76g
Purity : 99.95%
Packing: PE-bag
25.00
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 high purity tungsten pearl - 3.82g 99.95% purity  Art. Nr. 001699  
high purity tungsten pearl - 3.82g 99.95% purity
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High pure tungsten metal pearl - 99.95% purity
Arc melted !!!

Size about 8mm - These unique pieces of melted tungsten are very rare and difficult to produce due to its high melting point of more than 3410 degrees C.!

Amount: 3.82g
Purity : 99.95%
Packing: PE-bag
36.00
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