Three different aluminium alloys are used, which are available in a range of tempers.

For heat treatable alloys the designation system uses the letter "T", followed by the grade number to indicate the thermal treatment. The following thermal treatments or "tempers" are available for the range of alloys produced at Kaye Aluminium.

In the heat-treatable 6000 series, into which Kaye alloys fall, forming is effected after annealing or immediately after solution treatment (T4 condition). Forming or bending in the fully heat-treated condition (T6) may not be possible, depending on the section thickness or shape.

For punching and shearing, drilling, tapping, reaming, the harder the temper (i.e. T6 condition) the better for the resulting edges of the machined parts are cleaner and the cutting tools will not clog and will work more efficiently.