Shenzhen High-Tech Industry Ltd. has been specializing in continuous electroplating since 1995. After a decade of research, we developed black chromium nickel-plated copper. Now we have a large supply of black chromium nickel-plated copper / Alunimum coil to manufacturers of flat plate solar thermal collectors. Black chromium nickel-plated copper / Alunimum is a very desired selective surface using in solar absorber fins for a flat-plate solar thermal collector, which is very durable, highly resistant to humidity or oxidizing atmospheres and extreme temperatures while being able to retain its selective properties. Because it has very good resistance to corrosion, low maintenance requirements and high thermal stability. The descriptions are as follows. Copper strip measurement (T x W x L): A. 0.15 x 125 x 1840 (mm) B. 0.15 x 140 x 1840 (mm) C. 0.15 x 250 x 1840 (mm) D. 0.15 x 475 x 1840 (mm) l Rolling coil is available, regularly about 200--250Kg per roll. l Thickness is available from 0.14/0.20mm. Absorption (alpha) a= 0.97 Emission (epsilon) e= 0.10 . Flat Plate Solar Collector with three kinds of absorber fin made of Black Chrome Nickel plated copper, Aluminium coil regular size: 990(max width).
We have other products: 1.tinned copper coil for radiator; 2.tinned copper net for battery; 3. steel board plated with copper and so on. 
Welcome to contact me for more information.