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Polyamide is a system of thermally insulating aluminium profiles by combining individual extruded aluminium sections, with pre-formed insulation strips.

Shaped polyamide strips are inserted into specially designed channels on each part of the aluminium profiles to be joined, linking them together.

In order to obtain the required strength after rolling, a knurling process is used to develop small teeth on the inside edges of the strip channels prior to assembly. With the polyamide strips in place the assembly is subsequently rolled which turns the outer edges of the strip channels onto the polyamide strips, gripping them tightly.

After trimming the end, a 100mm sample is cut from the assembled bar and tested for stability, using an apparatus designed to test the mechanical strength of the bond. A shearing action is applied in an attempt to force the aluminium components to slip on the polyamide strips, the pressure or shear value needed to break the bond, is given as a digital display which must reach pre-determined values to pass.

Polyamide insulation has numerous advantages over the 'pour and cut' insulation method. The system gives flexibility, including the ability to alter profiles relatively inexpensively to stay in line with future legislation. It also simplifies the application of dual colours to window and door systems.

Major issues such as chemical useage and noise pollution do not apply to this system, greatly reducing environmental implications.