As per B.S. 2871 Part - 2/72 C 101
Near Equivalent specification B.S. 1977/ 63 & (ASTM B - 188-81)
Uses
Copper tube used for gas, heater and hydraulic lines, oil burners, refrigerators, evaporators and heat exchangers.
Hollow (round, square, rectangular and elliptical) electrical conductors in high voltage installation, induction furnaces etc