| ASTM-B-777-87 | Class 1 | Class 2 | Class 3 | Class 4 |
| Miniumum Density(g/cc) | 16.85 | 17.15 | 17.75 | 18.25 |
| Minimum Density (lbs/in3) | 0.608 | 0.619 | 0.641 | 0.659 |
| Nominal W Content (wt.%) | 90 | 92.5 | 95 | 97 |
| Nominal Nickel Content (wt.%) | 7.1 | 5.4 | 3.6 | 2.1 |
| Nominal Iron Content (wt.%) | 2.9 | 2.1 | 1.4 | 0.9 |
| Typical Hardness (HRC) | 28 | 28 | 29 | 30 |
| Modulus of Elasticity (x106 psi) | 45 | 48 | 50 | 52 |
| Ultimate Tensile Strength Min. (ksi) | 120 | 120 | 120 | 110 |
| 0.2% Offset Yield Strength Min (ksi) | 80 | 80 | 80 | 80 |
| Minimum % Elongation (1" Gauge Length) | 10 | 8 | 6 | 2 |
