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The aluminum profiles for doors and windows are made of 6-series aluminum alloy, and the aluminum-magnesium silicon is the main element of the 6-series aluminum alloy, and each element has a certain range of content. However, the price of various elements is inconsistent, and the lack of precious metal content is a major cause of poor profile quality. Only in strict proportion then can produce aluminum extrusions of excellent quality. The prepared raw materials are placed in an aluminum melting furnace to be melted, slag is discharged, cooled, and then cast aluminum ingots or bars are used for the production of aluminium profiles. If the exhaust is not ideal, the air bubbles in the aluminium profile will cause defects. The aluminium profiles for doors and windows are mainly made of 6063 grade aluminum alloy. If the aluminum extrusion manufacturer uses the national standard 6063 aluminum ingot, it will be guaranteed in terms of raw material quality.

Unlike spray-on rust prevention coatings that only cover exposed surfaces, hot dip galvanization coats the outside, inside and underside of the dipped pieces.  The biggest problem with lower end spray coatings is that the pieces will often rot from the inside out and by the time you see it, the piece is already ruined.  Look for specifics on how the pieces are treated to prevent rust.  Our Stronghold Iron line utilizes a hot dip galvanization, a 4-stage chemical wash and then use a TGIC poly-based powder coating with UV fade inhibitors to protect our pieces.