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C116
Copper 116 – Silver-Bearing Tough Pitch (STP)
C11600
Overview
Copper 116 is an ETP copper with a controlled silver addition (minimum 25 Troy oz/ton, equivalent to 0.085% Ag). The silver raises the softening temperature and improves creep resistance without measurably affecting electrical conductivity. This makes Copper 116 the ideal busbar material for applications operating at elevated temperatures (up to 200°C) where standard ETP copper would lose its temper and mechanical strength.
Chemical Composition
| Element | Min | Max |
|---|---|---|
| Copper + Silver | 99.90% | — |
| Silver (Ag) | 25 Troy oz/ton (0.085%) | — |
| Oxygen (O) | — | ~0.04% |
Alloy Designations
UNSC11600
Common NameSilver Copper / STP
TypeTough Pitch with Ag
Mechanical Properties
Tensile Strength (½ Hard)42 ksi (290 MPa)
Yield Strength (½ Hard)36 ksi (248 MPa)
Elongation (½ Hard)14%
Rockwell Hardness (½ Hard)40 HRB
Tensile Strength (Extra Spring)57 ksi (393 MPa)
Shear Strength26 ksi (179 MPa)
Physical Properties
Density8.89–8.94 g/cm³
Melting Point (Liquidus)1,082°C (1,980°F)
Electrical Conductivity100% IACS
Thermal Conductivity391 W/m·K
Coefficient of Thermal Expansion17.0 × 10⁻⁶ /K
Typical Applications
- High-temperature busbars and conductors
- Commutator segments for electric motors
- Soldering iron tips
- Resistance welding electrodes
- Electrical equipment in high-ambient-temperature environments
- Transformer windings
Fabrication & Joining
- Same workability as standard ETP copper
- Excellent cold and hot forming
- Higher softening temperature than C101/C110
- Soldering and brazing: Excellent
- Standard welding processes apply
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