Commercial Glazing Material Spec
Aluminum extrusion grades for commercial glazing — 6063-T5 vs 6061-T6
Commercial glazing aluminum is typically 6063-T5 alloy — the architectural extrusion alloy with good extrudability, mid-range strength, and excellent surface finish. 6061-T6 is the structural aluminum alloy used for high-load components (anchors, structural mullions, premium curtain wall verticals) where 6063's strength is insufficient.
Why is 6063-T5 standard for commercial storefront?
6063-T5 extrudes cleanly into complex architectural profiles, accepts PVDF/anodized finishes with consistent surface quality, and has yield strength (~145 MPa) sufficient for typical storefront wind loads. It's the architectural extrusion alloy.
When does aluminum need to be 6061-T6?
Structural anchorage components, high-load curtain wall verticals, oversized openings under high wind pressure, and specialty structural applications. 6061-T6 yield strength (~276 MPa) is roughly 2x 6063-T5.
Does the finish look different between 6063 and 6061?
Both alloys accept PVDF Kynar 70/30 and Class I/II anodized finishes. Surface quality at the extrusion stage is slightly higher on 6063-T5 — the architectural reason it's preferred when structural performance allows.