PVDF-Coated Aluminum Curtainwall Extrusion
This information reflects our best understanding of product composition in 2015, with the exception of the following components that have since had their composition updated: Chromate Pretreatment (updated 2024).
This common product describes an aluminum extrusion with a 70% PVDF coating, as is common in curtain walls. The aluminum alloys typically used in curtain walls come from the 6xxx series, more specifically 6063 in either a T5 or T6 temper. These...
This common product describes an aluminum extrusion with a 70% PVDF coating, as is common in curtain walls. The aluminum alloys typically used in curtain walls come from the 6xxx series, more specifically 6063 in either a T5 or T6 temper. These tempers are chemically identical but have been put through different heat treatments to impart slightly different strength and performance characteristics. Because they are part of a building exterior, extruded aluminum for use in curtain walls includes a surface treatment. Both PVDF coatings and anodization are common for this application (see Anodized Aluminum Curtainwall Extrusion). PVDF coatings are typically 50 or 70% PVDF in the resin. The higher PVDF percentage offers superior weatherability, meeting AAMA2605 requirements. Some PVDF powder coatings are available, but solvent-based liquid coatings appear to be most common. A two-coat system is outlined here (primer + PVDF coating), however, a clear topcoat is sometimes applied as well. A wide variety of colors are available - specific pigments may have additional associated hazards and LCA impacts. The dimensions of curtain wall framing are customizable. Based on a sample review of product literature, percentages are based on a segment of anodized aluminum extrusion 24 feet long, 2.5 inches wide, 6 inches deep, and 0.125 inches thick. For estimation purposes, we’ve assumed a simplified geometry and have excluded grooves, etc. from our calculation of surface area.