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    Energy Cost of Plastic Polyethylene Mj/Kg = 90 Mj/Kg Plastic = 90 Mj/Kg 3.1g = 0.28 Mj/Kg. Taking the calculated values above and compiling them in Table 1the manufacturing energy requirement of the iPhone 4 can be calculated. Obviously production of the circuit board has by far the largest impact on the environment.

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    During oxidative leaching of e waste i.e. waste of printed circuit boards in H2SO4 H2O2/O2 solutions in addition to copper silver is also dissolved at certain levels.

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  • PCB Etching Tips And Guides On Etching Your PCB

    The pen has a nylon tip that enables fast manufacturing of the printed circuit boards. An example is its use on Copper printed circuit board Circuits can be drawn on plain copper laminate and then etched in Ferric Chloride or etchant solutions this is allowed to dry for few minutes then immerse the board in etching fluid until you confirm

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