Limit Deviations of External Dimensions for Flat, Curved and Spherical Flake Powder Contacts (Unit: mm)
| External dimensions including length, width and outer diameter | thickness(T) | |||||
| Nominal size | Tolerance | Nominal size | Tolerance | |||
| Rolled and extruded alloy electrical contacts | Internal oxidation alloy electrical contacts | |||||
| ≤3 | +0.04 | 0.4～1.0 | -0.06 | -0.10 | ||
| -0.10 | ||||||
| 3～6 | +0.06 | 1.0～1.5 | -0.10 | -0.12 | ||
| -0.12 | ||||||
| 6～10 | +0.08 | 1.5～2.0 | -0.12 | -0.15 | ||
| -0.15 | ||||||
| 10～18 | +0.10 | 2.0～3.0 | -0.15 | -0.20 | ||
| -0.17 | ||||||
| 18～30 | +0.12 | ＞3.0 | -0.20 | -0.25 | ||
| -0.21 | ||||||
| 30～50 | +0.14 | |||||
| -0.25 | ||||||
| 50～80 | +0.16 | |||||
| -0.30 | ||||||
Note: The limit deviation of thickness for flat, arc and spherical sheet electrical contacts: when the thickness is greater than 1 mm, it shall be IT14 (refer to GB/T 1800.1-2009), or specified in Table 1; when the thickness is less than or equal to 1 mm.
Silver-nickel
| Identification | Feature | Main Application Field |
| AgNi | Environmentally friendly, adopt the advanced technique of sintering and extrusion, nickel-grain homogeneously distribute as fibers. The material has high conductivity,low&stable contact resistance; better resistance of melting, welding and wearing under the middle and low current; the material transfers less under the condition of direct current; if the content of nickel increasesjt can improve the resistance of melting and welding, but raise contact resistance and elevate the temperature. | Contactors |
| Identification | Manufacturing technique | Silver content (Wt.%) | Density (g/cm³) | Resistivity (μΩ.cm) | Vickers hardness (HV) |
| AgNi(10) | Powder Metallurgy | 89～91 | 10.22～10.42 | 1.75～1.99 | 75～120 |
| AgNi(15) | 83～85 | 10.22～10.42 | 1.95～2.15 | 90～140 | |
| AgNi(20) | 78～80 | 10.15～10.35 | 2.05～2.25 | 100～130 |
 |  | |
| AgNi(10) transverse | AgNi(10) longitudinal |
Silver-Cadmium Oxide Contact
| Identification | Feature | Main Application Field |
| AgCdO | With advanced process of sintering and extrusion, material particles of AgCdO distribute uniformly among silver substrate. Under the action of electric arc, AgCdO composes,evaporates,which makes switch point surface cool down, that is reducing theoxyarc energy and quenching arc. So AgCdO raises the material resistance of oxygen welding and voltaic arc, and reduces electricresistance at the same time. The more AgCdO is, the better resistance of oxygen welding is. The shortcoming is higher electric resistance, more temperature rise, and worse plasticity. | Contactors |
| Identification | Manufacturing technique | Silver content (Wt.%) | Density (g/cm³) | Resistivity (μΩ.cm) | Vickers hardness (HV) |
| AgCdO(10) | Pre-oxidation Process | 89～91 | 10.10～10.30 | 1.90～2.10 | 80～135 |
| AgCdO(12) | 87～89 | 10.05～10.25 | 2.00～2.20 | 60～135 | |
| AgCdO(15) | 84～86 | 9.95～10.15 | 2.07～2.27 | 60～135 | |
| AgCdO(17) | 82～84 | 9.92～10.12 | 2.08～2.28 | 60～135 | |
| AgCdO(12) | Post-oxidation Process | 89～91 | 10.05～10.20 | 2.63～2.98 | 71～99 |
| AgCdO(15) | 84～86 | 9.92～10.08 | 2.82～3.36 | 75～112 | |
| AgCdO(17) | 82～84 | 9.90～10.07 | 2.96～3.50 | 81～120 |
 |  | |
| Post-oxidation Process AgCdO(15) | Post-oxidation Process AgCdO(15) |
Silver-Tin Oxide
| Identification | Feature | Main Application Field |
| AgSnO₂ | Silver tin oxide material has the same electrical properties as silver cadmium oxide material, and has better welding resistance, arc ablation resistance and abrasion resistance. It is non-toxic and harmless, and it is an environmentally friendly material. | Contactors |
| Identification | Manufacturing technique | Silver content (Wt.%) | Density (g/cm³) | Resistivity (μΩ.cm) | Vickers hardness (HV) |
| AgSnO₂(10) | Powder Metallurgy | 89～91 | 9.75～9.95 | 2.05～2.25 | 65～120 |
| AgSnO₂(12) | 86.5～88.5 | 9.65～9.85 | 2.15～2.35 | 60～125 | |
| AgSnO₂(12) | Atomizing-Sintering-Extrusion (Atomization method) | 87～89 | 9.80～10.00 | 2.00～2.30 | 75～115 |
 |  | |
| AgSnO₂(12) 200X transverse | AgSnO₂(12) 200X longitudinal |
Indium Oxide Silver Oxide
| Identification | Feature | Main Application Field |
| AgSnO₂ln₂O₃ | AgSnO₂ln₂O₃ show high arc erosion resistance and a good resistance against contact welding. By introducing certain additives, the AgSnO₂ materials, produced by the powder metallurgy technique (sintering and extrusion) can be modified in such amanner that contact resistance and over temperature behavior can be maintained low and stable over service life. Material transfer in DC operation is low. Contact materials of the AgSnO₂ and AgSnO₂ln₂O₃ type are non-toxic and friendly to the environment. | Contactors |
| Identification | Manufacturing technique | Silver content (Wt.%) | Density (g/cm³) | Resistivity (μΩ.cm) | Vickers hardness (HV) |
| AgSnO₂In₂O₃(10) | Pre-oxidation Process | 89～91 | 9.90～10.10 | 2.05～2.25 | 95～115 |
| AgSnO₂In₂O₃(12) | 87～89 | 9.70～9.95 | 2.20～2.50 | 90～120 | |
| AgSnO₂In₂O₃(14.5) | 84～87 | 9.65～9.85 | 2.20～2.65 | 95～125 | |
| AgSnO₂In₂O₃(12) | Post-oxidation Process | 87～89 | 9.79～9.97 | 3.03～3.84 | 102～151 |
| AgSnO₂In₂O₃(14) | 84～87 | ≥9.50 | ≤3.50 | ≥80 |
 |  | |
| Pre-oxidation Process AgSnO₂In₂O₃(12) | Pre-oxidation Process AgSnO₂In₂O₃(12) |
Silver Oxide Copper
| Identification | Feature | Main Application Field |
| AgCuO | Environmentally friendly materials have excellent, stable welding resistance and good arc erosion resistance. They also have high hardness, good conductivity and thermal conductivity. They have lower material transfer under DC conditions. They are ideal electrical contact materials. | Contactors |
| Identification | Manufacturing technique | Silver content (Wt.%) | Density (g/cm³) | Resistivity (μΩ.cm) | Vickers hardness (HV) |
| AgCuO(10) | Atomizing-Sintering-Extrusion (Atomization method) | 89～91 | 10.20～10.40 | 1.80～2.00 | 95～125 |
 |  | |
| AgCuO(10) 200X transverse | AgCuO(10) 200X longitudinal |
