ALUMINUM GLOSSARY - Airoldi Metalli

Precision (of measurement)
The extent to which repeated measurement of a standard with a given instrument yields the same result.
Preheating
A high temperature soaking treatment to provide a desired metallurgical structure. Homogenizing is a
form of preheating.
Press Alignment
The relationship between the center lines of the container, ram, and tool stack.
Press, Extrusion
The hydraulic machine which applies pressure to an aluminum billet inside a container, extruding it
through the opening of a die.
Press Tools
Parts of an extrusion press that are changed to produce a specific shape. This includes stem, fixed dummy,
container and liner.
Pressure Ring
A steel ring that is fitted into the center of the press platen against which the tooling stack is supported
during extrusion.
Pretreatment
The chemical alteration of a surface to make it suitable for application of paint or powder. The process
usually includes cleaning and applying a conversion coating.
Primer
Type of paint applied to a surface to increase its comptability with a topcoat, or to improve adhesion or
the corrosion resistance of the substrate.
Profile
A product that is long in relation to its cross-sectional dimensions, having a cross-section other than those
of wire, rod, bar, and tube, produced by extrusion, rolling, drawing, or cold finishing. Formerly termed a
shape.
Profile, Class 1 Hollow Extruded
A hollow extruded profile, the void of which is round and 1 inch or more in diameter and whose weight is
equally distributed on opposite sides of two or more equally spaced axes.