Copper is pure copper: pure copper is purple red, also known as copper. The density of pure copper is 8.96, the melting point is 1083 C. The quality of copper tube is as follows: G = 8.96 pi_ Delta (D-delta)/1000 brass plate G: quality kg_ delta: Sister D: Sister D: Sister D: Sister D: Sister diameter of tube is suitable for making brass tube with trademarks T1 and T2. The chemical composition of T1T2 T1 is Cu+Ag 99.95%, brass rod P 0.001%, Bi 0.001%, Sb 0.002%, As 0.002%, Fe 0.005%, Ni 0.002%, Pb 0.003%, Sn 0.002%, S 0.005%, Zn 0.005%, O 0.02%. The chemical constituents of white copper band T2 are Cu+Ag 99.95%, Bi 0.001%, Sb 0.002%, As 0.002%, Fe 0.005%, Pb 0.005%, S0.005%. Thermal conductivity (lambda) 384/W. (m. K) - 1 specific heat fusion (C) 0.394/kj. (kg. K) - 1 of white copper sheet