Is it just marketing or is there an actual structural difference?
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What I picked up working in general aviation.
What is the manufacturing/milling process between a piece of aluminum, space grade aluminum, and certified spacegrade aluminum? Nothing, it is all the same raw stock.
Being certified material means everything in the aviation and spacecraft industries. It means that the mill has tested the material for proper ratios of alloy materials and for tensil and ductile strength. It is then issued a certificate that can be used for traceability, if there is a faulure if a manufactured part. This adds a huge increase to the raw stock and handling prices (each piece of stock had the cert number engraved into it).
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