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Fine Tungsten Powder
| Grade | BET or F.s.s.s | Oxygen% max |
| GW10 | 0.9-1.1 | 0.20% |
| GW13 | 1.2-1.4 | 0.15% |
| GW15 | 1.4-1.6 | 0.12 |
| GW20 | 1.8-2.2 | 0.08 |
| GW25 | 2.3-2.7 | 0.08 |
| GW30 | 2.8-3.2 | 0.06 |
| GW35 | 3.3-3.7 | 0.06 |
| GW40 | 3.7-4.3 | 0.04 |
| GW45 | 4.2-4.8 | 0.04 |
| GW50 | 4.6-5.4 | 0.04 |
| GW55 | 5.0-6.0 | 0.04 |
| GW60 | 5.5-6.5 | 0.04 |
| GW65 | 6.0-7.0 | 0.04 |
| GW70 | 6.5-7.5 | 0.04 |
| GW80 | 7.5-8.5 | 0.04 |
| GW90 | 8.5-9.5 | 0.04 |
Trace elements for powder below 9.0u
| Element | Max | Typical | Element | Max | Typical | Element | Max | Typical |
| Al | 0.0010 | 0.0005 | Fe | 0.0050 | 0.0010 | Pb | 0.0003 | 0.0001 |
| As | 0.0010 | 0.0005 | K | 0.0015 | 0.0010 | S | 0.0010 | 0.0005 |
| Bi | 0.0003 | 0.0001 | Mg | 0.0010 | 0.0005 | Sb | 0.0005 | 0.0003 |
| C | 0.0030 | 0.0010 | Mg | 0.0010 | 0.0005 | Si | 0.0015 | 0.0010 |
| Ca | 0.0015 | 0.0006 | Mn | 0.0010 | 0.0005 | Sn | 0.0003 | 0.0001 |
| Cd | 0.0005 | 0.0001 | Mo | 0.0030 | 0.0016 | Ti | 0.0010 | 0.0005 |
| Co | 0.0010 | 0.0005 | Na | 0.0015 | 0.0007 | V | 0.0010 | 0.0005 |
| Cr | 0.0020 | 0.0010 | Ni | 0.0020 | 0.0010 | ? | ? | ? |
| Cu | 0.0003 | 0.0001 | P | 0.0010 | 0.0005 | ? | ? | ? |
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