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A last and even more important, additional advantage of polyamide is the excellent thermal insulation. While aluminium scores much less well than wood and PVC in that area, it performs at least as well in terms of U_f value thanks to the polyamide strips (which insulate 500x better than aluminium).

Sliding and Folding Doors: Aluminium profiles are used in the construction of sliding and folding doors, which require robust frames that can withstand the movement and pressure of sliding panels.