1080 is the purest of the four grades commonly stocked in the 1xxx series, guaranteeing a minimum of 99.8% aluminum by weight. At this purity level, iron and silicon impurities are held to strict fractions of a percent, and every other trace element — copper, manganese, magnesium, zinc, titanium — is capped in the hundredths. As with the rest of the commercially pure family, 1080 has no meaningful alloying content to respond to heat treatment; whatever mechanical strength it has comes from cold working, and even in its hardest temper it remains one of the softer materials a machine shop will handle.

The tradeoff for giving up strength is close to peak performance in electrical conductivity, thermal conductivity, and corrosion resistance for a wrought aluminum product. 1080 is specified where those properties are non-negotiable: high-purity electrical conductors and foil, chemical and pharmaceutical processing equipment, specialty reflectors, and anodizing or bright-finish applications that depend on a very clean, impurity-free surface. It is essentially never chosen for structural duty — that role belongs to the alloyed 2xxx, 6xxx, and 7xxx series.

At 99.8% pure aluminum, 1080 is about as gummy as this material family gets — and it's the sharpest illustration of why "soft" doesn't mean "easy" at the machine. With virtually no alloying content, the metal has minimal strength and very high ductility, so it deforms and smears under the cutting edge rather than shearing off in a controlled chip. Left unmanaged, this shows up as built-up edge (BUE): material welds onto the insert, then tears back off unevenly, leaving a rough surface finish and inconsistent dimensions.

The way to get good results is almost counterintuitive: treat the material aggressively, not gently. Sharp, highly polished, essentially unhoned cutting edges reduce the surface area available for aluminum to stick to. High positive rake angles help the tool shear the material cleanly instead of pushing it. And counter to instinct, running at the higher end of the recommended cutting speed range reduces BUE rather than causing more of it, because less time is spent in contact at any given point on the edge. Flood coolant or an air blast is worth the setup time — it clears chips before they can re-adhere.

Expect long, continuous, stringy chips with essentially no natural chip-breaking tendency. A chipbreaker geometry suited to soft, non-ferrous materials, run at feed rates high enough to keep chip thickness above the point where it just ribbons out, is the standard way to keep 1080 from wrapping chips around the tool or workpiece during a run.