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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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    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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