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How to electropolish big aluminum box?

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I fabricate metal, and have an order from a customer to do waste bin box used in new airport. Must finish after fab, and lastly "ELectropolish specified color". Material uses is Aluminum of thickness 2.5mm, Alloy/temper1100 h-14 sheet. My help needed is what does "ELectropolish specified color" mean? How to use process and chemical? Dimensions of the box are width 650 * depth 400 * height 800. Quantity 5000 sets, delivery time 2 months. How do it quick . problem meet one this box had weld in coner and grinding smooth this case could seen after finish or not any one have expert to suggest my company.

Regard

Udom Suroungluk
Whale Stainless steel - Thailand

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