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By certification 
Material Feature::
The preparation method of the tungsten sheet or foil is to first prepare the tungsten slab by isostatic pressing and then high-temperature sintering to prepare the tungsten slab, and then the tungsten slab is rolled by a rolling mill, and the tungsten plate and tungsten sheet are cut and formed by a shearing machine. The material is mainly used to manufacture the heating element of the electric vacuum furnace, the heat shield and the parts of the electric vacuum electric light source, etc. The tungsten boat made of the tungsten sheet is used for vacuum coating utensils.
Tungsten foil or sheet thickness deviation:
Width inch(mm) | Thickness inch(mm) | Thickness deviation inch(mm) |
≤12（305） | 0.005-0.01(0.13-0.25) | 0.001(±0.0254） |
＞0.01-0.02(0.25-0.51) | ±0.002(±0.051） | |
＞0.02（0.51) | ±10% | |
＞12-24（305-610） | ＞0.01-0.025(0.25-0.64) | ±0.0025(±0.064） |
＞0.025（0.64) | ±10% |
Tungsten foil or sheet flatness deviation:
Thickness inch(mm) | Flatness deviation，Max% |
0.005-0.187（0.13-4.75） | 4 |
0.188-0.625（4.75-15.9） | 5 |
Chemical composition:
Chemical composition | ||||||||||
Impurity content (%),≤ | ||||||||||
W | Fe | Ca | Cu | Sn | Cd | Bi | Al | Ni | N | Sb |
Balance | 0.0026 | 0.001 | 0.0005 | 0.0001 | 0.0001 | 0.0001 | 0.0006 | 0.0009 | 0.0015 | 0.001 |
Mg | Mo | Si | O | Pb | As | C | ||||
0.0006 | 0.003 | 0.001 | 0.0018 | 0.0001 | 0.001 | 0.002 | ||||
Application field:
1. Electric light source parts and electric vacuum devices
2. Tungsten boat, heat shield and heating element of high temperature furnace
3. Medical diagnosis and treatment equipment
4. Radiation and interference shielding
http://www.unicorntungsten.com/
