Keep in mind that not every PCB contains all the layers listed â the need for different layer types depends on the specifics of your design. Single layer boards typically include: a mechanical layer, a keep out layer, a routing layer, an overlay layer, a solder mask layer and a solder paste layer.
An austenitic (300 series) stainless steel will outlast both aluminum and steel exposed to rain or salt spray. Steel without a protective coating will do poorly in both environments but if properly plated or painted, may last a long time. The aluminum alloys likely to be found in many consumer products may develop âlawn chair diseaseâ exposed to at least urban rain and condensation but possibly also in cleaner environments as well (up to you to test).
1 Aluminium is used to make food containers, because of its resistance to corrosion. 2  Aluminium with magnesium [alloy] is used to make body of aircraft. 3  Aluminium with other metals, used to make railway tracks. 4  Aluminium is used to make cooking utensils, because it is resistant to corrosion, and light-weight.