Chemical composition:
| Main and minor components | Min.content(%) | ASTM B386 (361) |
| Ta | 99.95 | balance |
| Impurities | Max.values (μg/g) | Max.values (μg/g) |
| Fe | 100 | 100 |
| Mo | 100 | 200 |
| Nb | 400 | 100 |
| Ni | 50 | 100 |
| Si | 50 | 50 |
| Ti | 50 | 100 |
| W | 100 | 500 |
| C | 30 | 200 |
| H | 15 | 15 |
| N | 50 | 100 |
| O | 100 | 250 |
| Cd | 10 | - |
| Hg | 10 | - |
| Pb | 10 | - |
Dimensions and toleraces
| Thickness (mm) | Thickness tolerance (±mm or % of the thickness） | Width tolerance±mm | |
| Width≤320mm | 320mm≤Width≤610mm | ||
| 0.10 | 0.008 | 0.5 | |
| 0.10-0.15 | 0.010 | 0.5 | |
| 0.15-0.30 | 0.010 | 0.5 | |
| 0.30-0.40 | 0.015 | 0.037 | 1.6 |
| 0.40-0.60 | 0.020 | 0.050 | 1.6 |
| 0.60-0.80 | 0.030 | 0.065 | 1.6 |
| 0.80-1.00 | 0.035 | 0.080 | 1.6 |
| 1.00-2.50 | 0.040 | 0.100 | 2.0 |
| 2.50-6.00 | 0.060 | 4% | 2.0 |
| 6.00-12.70 | 5% | 2.0 | |
Length tolerance:The length tolerance for sheet length up to 1000mm maximal +5/-0 mm.
Flatness:max.4% (measuring procedure on the basis of ASTM B708)
Density: ≥16.6g/cm³
Vicker hardness: Thickness≥0.15mm : ≤125HV
Tensile test:
| Thickness (mm) | Tensile Strength Min. (MPa) | 0.2% Yield strengt Min.(MPa) | Elongation Min.(%) |
| 0.10-0.15 | 250 | 180 | 15 |
| 0.15-1.50 | 230 | 160 | 20 |
| 1.50-12.70 | 225 | 140 | 30 |
Appearance:The material will be of uniform quality, free from foreign matter, splits and fractures.Bed sheets (not trimmed) may bave small edge cracks.