What are The Grades of Tungsten Rod

In reference to different chemical components and applying requirement, the grades of tungsten rod are divided into four categories:W1, W2 ,W3,W4.
Dimensions
The length of the finished products tungsten bar, tungsten rod for W1, W2, and W3 should not be less than 300mm, and that for W4 should not be less than 30mm.

Appearance
The appearance of tungsten bar, tungsten rod, turns to be metallically gray or dark gray. Hygroscopy is not allowed on the appearance of W1 ,W2, and W3 tungsten bar, tungsten rod.
Surface State
Any oxidation, contamination, and severe excessive fusion, bubbling, delamination, or crack is not allowed for product W1. Camber should be no more than 10mm. Any excessive fusion, bubble, delamination, crack, surface bulky crystallization or severe oxidation &contamination are not allowed for products W2 and W3. The length of the spalls should not be more than 8mm, width no more than 3mm, depth no more than 1mm; The diameter of mechanical pitting should not be more than 1mm, depth no more than 0.5mm; Camber should be no more than 4mm.
Any oxidation or contamination is not allowed for product w4.
The cartridge of the vertical sintering part should be cut off, and the section is not allowed to be loose or intermingled.
Physical property
The density for W2, W3 tungsten bar,tungsten rod is more than 17.5g/cm3.
Measured data for the section grain size of W2, W3 can be provided. If the buyer has any other special demand, it can be discussed on the base of mutual negotiation.
For more information, please visit http://www.samaterials.com/pure-tungsten/115-tungsten-rod.html