The price of Aluminium 6061 is primarily driven by its temper designation (e.g., T6, T4, or T651), which determines its mechanical properties like tensile strength and hardness. Additionally, the form factor (sheets, plates, rods, or custom extrusions) and surface finish (mill finish, anodized, or powder-coated) significantly impact the final quote. Buyers should ensure the material meets ASTM B209 or EN 485 standards to guarantee chemical composition accuracy, specifically the magnesium and silicon levels that define the 6000 series.