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).
Keep these 10 differences in mind when deciding which type of metal to use in your next project: 1  Strength to weight ratio. Aluminum is typically not as strong as steel, but it is also almost one third of the weight. 2  Corrosion. Stainless steel is made up of iron, chromium, nickel, manganese and copper. 3  Thermal Conductivity.