C101 BS 2874 Cu-ETP
Stock sheet 1200mmx 600mm 300mm sq min cut
C101 contain 0.05% oxygen which whilst not affecting ductility or conductivity will cause embrittlement if heated in a reducing atmosphere . use C103 instead

Cu impurities
99.90 0.03 max
hardened
0.2% Proof stress 325N/mm2
Tensile Strength 385
Elongation 4%
Hardness 115HV