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C110 vs C102 Copper Busbar: Rolled, Extruded, and Welded
Hussey assigns C110 to rolled bar and C101 or C102 to extruded bar. Watteredge says to specify C11000 when it is suitable, and oxygen-free copper when the metal will be welded.
On this page
Use C110 when Hussey is rolling the bar and the drawing does not call for an oxygen-free copper. Use C101 or C102 when Hussey is extruding the bar. Use C10100 or C10200 when Watteredge's rule applies: oxygen in the copper is undesirable, including metal that will be welded or certain electronic parts. Watteredge says C11000 should be specified when suitable. As of October 22, 2026, that sheet prints a minimum copper content of 99.90 percent and 101 percent IACS for C11000, and the same 101 percent IACS for 102 oxygen-free copper. A rolled bar that will also be welded sits on both instructions. Name the process and the weld on the request.
Hussey splits the alloy by the way the bar is made
Hussey's busbar page, opened October 22, 2026, lists the base material as high-conductivity copper C110 for rolled busbar products and C101, C102 for extruded busbars. The same page lists thickness from 0.050 inch to 2.00 inch, widths from 0.500 inch to 12.00 inch, and lengths up to 396 inch. Coils are listed at 350 inch maximum PIW. Edge contours listed are square corners, rounded corners, and full rounded edge. The mill address on the page is 100 Washington Street, Leetsdale, PA 15056. The page says products are manufactured to applicable ASTM standards at an ISO-certified facility and does not name the ASTM designation.
Plating lengths on that page, as of October 22, 2026, are separate from the alloy. Silver flash is listed for lengths of 72 inch to 240 inch. Tin-plated bar is listed for lengths of 72 inch to 144 inch. A rolled C110 bar that needs silver and is longer than 240 inch, or tin and longer than 144 inch, is outside those length lines. The finish guide covers how to name tin, nickel, and silver. It does not carry these Hussey length limits.
Watteredge splits the alloy by oxygen and welding
Watteredge's copper bus bar specifications PDF, opened October 22, 2026, describes C11000 electrolytic tough pitch copper as the most common type, with a minimum copper content of 99.90 percent and an electrical conductivity of 101 percent IACS. It says C11000 should be specified when suitable, based on availability and cost. C10100 and C10200 are described as oxygen-free coppers, used where oxygen is undesirable, as in certain electronic parts or metal to be welded. The sheet says these coppers have higher purities than electrolytic tough pitch and are cast with oxygen excluded. The comparison list on the same PDF prints 101 percent IACS for 110 electrolytic tough-pitch copper and 101 percent IACS for 102 oxygen-free copper.
C12200 on that PDF is phosphorous-deoxidized copper, described as relatively easy to weld and high-temperature braze, with electrical conductivity of approximately 85 percent IACS. A drawing that says DHP or C12200 uses that 85 percent line. A drawing that says C11000 or C10200 uses the 101 percent line. The copper and aluminum comparison uses a different paper for aluminum section and weight. Conductivity in the table above is the percent Watteredge prints.
| Alloy on the page | Hussey assigns it to | Watteredge assigns it to | Conductivity Watteredge prints |
|---|---|---|---|
| C110 or C11000 | Rolled busbar | Specify when suitable. Minimum copper 99.90 percent. | 101 percent IACS |
| C101 or C10100 | Extruded busbar, with C102 | Oxygen-free. Electronic parts, or metal to be welded. | Not given its own percent on the comparison list |
| C102 or C10200 | Extruded busbar, with C101 | Oxygen-free. Same sentence as C10100. | 101 percent IACS |
| C12200 | Not named on the busbar page | Phosphorous-deoxidized. Weld and high-temperature braze. | Approximately 85 percent IACS |
Watteredge names a standard bus bar temper
The same Watteredge PDF says half-hard metal, produced by cold drawing or cold rolling, is the common hard temper for rectangular and square bar and is the standard bus bar temper. It lists that temper for parts that need machining, large-radius bends, slight cold heading, and slight cold swaging. Full hard is described as generally not suitable for bending. Annealed metal is described for short-radius bending, cold heading, and cold swaging. Hussey's busbar page does not print a temper name next to C110 or C102. If the drawing is blank, write half-hard only when the Watteredge sheet is the specification you are following.
A rolled bar that will be welded
Hussey's rule follows the mill process: rolled is C110, extruded is C101 or C102. Watteredge's rule follows the metal: C11000 when suitable, oxygen-free when the part is welded or when oxygen is undesirable. When the bar is rolled and then welded, put both facts on the request: rolled or extruded, and whether the joint is welded. The mill applies its own rule to that pair of facts.
Current for a named C11000 section and a temperature rise is on the ampacity chart page. That chart is a C11000 chart. A change from C11000 to C10200 is an alloy change. The currents on the ampacity page are the C11000 columns.
What to write on the copper line
- Alloy: C110, C101, C102, or C12200, and which page the choice came from.
- Process: rolled or extruded, if Hussey's split is the one in use.
- Weld or oxygen-sensitive electronics, if Watteredge's split is the one in use.
- Temper, if the drawing or the Watteredge sheet names one. Half-hard is the standard bus bar temper on that sheet.
- Size inside Hussey's listed range, if that mill is quoting: thickness 0.050 inch to 2.00 inch, width 0.500 inch to 12.00 inch, length up to 396 inch, as of October 22, 2026.
- Finish length, if the bar is plated at Hussey: silver flash 72 inch to 240 inch, tin-plated bar 72 inch to 144 inch.
Questions these two pages answer
Does C102 raise the conductivity above C110 on the Watteredge sheet?
The comparison list prints 101 percent IACS for both 110 electrolytic tough-pitch copper and 102 oxygen-free copper. Watteredge's reason for C10100 and C10200 is oxygen, welding, and certain electronic parts.
Which alloy is an extruded bar that will be welded?
Hussey already assigns extruded bar to C101 or C102. Watteredge assigns metal to be welded to those oxygen-free coppers. On those two sentences the extruded welded bar is C101 or C102. Name the one the drawing uses.
Is C12200 a substitute when the joint is brazed?
Watteredge describes C12200 as relatively easy to weld and high-temperature braze, and prints approximately 85 percent IACS. Copy that 85 percent line when the drawing names C12200. The 101 percent line stays with C11000 and C10200.
Sources
The rolled and extruded assignment, the size range, and the silver and tin length lines are from Hussey's copper busbar page. The 99.90 percent copper line, the 101 percent IACS figures, the oxygen-free and weld description, the 85 percent IACS line for C12200, and the half-hard temper are from Watteredge's copper bus bar specifications PDF. Both were opened October 22, 2026.