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PVC Window Frame (1954)

Plastics News Europe staff
Posted 12 August 2009
In 1953 the metalworker Heinz Pasche sought a protective cladding for the metal window frame he had designed and patented. He contacted plastics producer Dynamit Nobel for a solution. The company established that a complex plastic frame system would be better than metal in holding and separating the insulated glazing panes.

Dynamit Nobel extruded a PVC cladding over the metal frame. By 1954 it had put the world’s first PVC window frame into series production with the ‘Mipolam elastic’ system using Mipolam plasticised PVC.

The blue 110 by 85cm frame had just a single chamger. By 1967 the Trocal 100 series were developed as the first profiles with multi-chamber cross sections, as commonly used today. These were followed in 1972 by the first co-extruded coloured profiles, in 1988 with the first co-extruded profiles with recyclate in the core and in 1992 with profiles clad in aluminium – the reverse of what Pasche had foreseen.

The Dynamit Nobel board had originally wanted to develop plasticised PVC window frames, despite its shortcomings – a higher co-efficient of thermal expansion than the metal frame and a tendency to soften under heat. Despite this, the researchers developed a rigid PVC solution initially involving three separate single chamber profiles for respectively stabilising the steel tube, water drainage and thermal insulation.

In its fiftieth anniversary year, the PVC window frame holds a 60% market share against competing wood and metal frames.


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