Is copar íon é copar corcra: Tá copar íon corcra-dearg, ar a dtugtar copar dearg freisin. Is é 8.96 dlús copar íon, agus is é 1083 céim an leáphointe.
Ríomhtar mais an fheadáin chopair mar seo a leanas: G=8.96πδ(D-δ)/1000
G: mais kg δ: tiús bhalla an fheadáin mm D: trastomhas an fheadáin mm
Is iad T1 agus T2 na gráid copair atá oiriúnach chun feadáin chopair a dhéanamh.
T1T2
Comhdhéanamh ceimiceach T1: Cu+Ag99.95%, P0.001%, Bi{{10}}.0 01%, Sb0.{{20}}02%, 0.002%, Fe0.005%, Ni0.002%, Pb0. 003%, Sn0.002%, S0.005%, Zn0.005%, O0.02%.
Comhdhéanamh ceimiceach T2: Cu+Ag99.95%, Bi0.001%, Sb{{10}}.002 %, As0.002%, Fe0.005%, Pb0.005%, S0.005%.
Seoltacht theirmeach (λ) 384/W·(m·K)-1
Teas sonrach (C) 0.394/kj·(kg·K)-1
