GRADE GUIDE · CU-ETP
Cu-ETP (CW004A / C11000) is electrolytic tough pitch copper — minimum 99.90% pure, with conductivity at or above 100% IACS. It is the electrical copper: busbars, earthing strips, transformer connections and switchgear links are almost always this grade.
Also listed as: CW004A · C11000 · E-Cu57 (old DIN) · Cu 99.90
Stock turns over piece by piece — what's listed is what exists. Post the spec you need and we match it against incoming material; you're alerted the moment something lands.
ETP is refined for one property above all: conductivity. The international standard for copper conductance (100% IACS) is effectively defined by this material, and every panel shop and substation contractor in the UAE consumes it as flat bar for busbars and earthing. It forms and punches easily, brazes well, and takes plating for contact surfaces.
Its one caution is hydrogen: heat ETP above about 370 °C in a reducing atmosphere (some welding and bright-annealing conditions) and the oxygen it carries embrittles the metal — for welded constructions the deoxidised Cu-DHP grade exists instead. Busbar off-cuts are the classic listing here: drops from switchgear jobs in standard bar sections, sold per piece with exact dimensions shown.
Not the best choice — its oxygen content risks hydrogen embrittlement under welding heat. Joints in busbar work are bolted or brazed with care; for genuinely welded copper fabrication, specify Cu-DHP.
By cross-section and length — 40×10, 50×10, 100×10 mm and similar standard bars. Each listing shows the exact section and length, so you can check ampacity against your schedule directly.
Copper carries high intrinsic metal value, so prices track the market more visibly than steel. Listed prices are held for a short validity window and reconfirmed at order if that window lapses.