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Window component manufacturers Edgetech, along with parent company Quanex, have a global reputation for excellence, a presence in over ninety countries around the world and now employ over 3,000 people internationally.

Founded in 1989, Edgetech make warm-edge spacer bars – the crucial elements that separate the glass panes in double-glazed windows and make a major contribution to how the finished unit performs.

Once, spacer bars were made of metal. But since metal is an excellent conductor of heat, the resulting windows offered very poor thermal performance. In response, manufacturers began to develop alternatives, and what’s become known as ‘warm edge’ technology was born.

Super Spacer – energy-efficiency pioneer

Edgetech’s Super Spacer, launched in 1989, was pioneering in its field. Rather than metal, Super Spacer was made with heat-insulating foam, over 950 times less conductive than aluminium, and its flexibility significantly simplified the window manufacturing process.

Thirty years later, Super Spacer is still the foremost foam warm edge spacer on the market, and Edgetech is a world-leader in its field – part of the 900 million-dollar Quanex group, a global building products giant based in Houston, Texas.

At Edgetech’s base in Coventry, Super Spacer is produced on two production lines, running 24 hours a day, five days a week. This adds local support into the 50+ spacer manufacturing lines that are running 24 hours a day, seven days a week around the world for Quanex.

Precision engineering

The manufacturing process starts with the extrusion of the base rubber material into a continuous length of spacer bar. It then goes through several curing stages, and is rigorously checked to ensure all impurities have been removed.

Next, it’s laminated, and has both a multi-layer vapour barrier (designed to keep out moisture) and adhesive tape (to make assembling the final window unit easier) applied.

Finally, the product is coiled onto reels, bagged, then heat sealed ready for distribution.

Constant innovation

Not content with resting on its existing leading warm-edge spacer range, Edgetech is characteristically continuing to forge ahead with exciting new product developments.

Using both its newly-upgraded in-house testing facilities in Coventry, and the world-class Quanex laboratories in Akron, Ohio, the company is currently working on several new product designs.

As a result of this, Edgetech will be launching a ground-breaking new spacer bar that has been designed and manufactured here in Britain at this year’s FIT Show exhibition.

It’s all part of the decades-long commitment to constant innovation that has made Edgetech synonymous with cutting-edge performance in its sector – and that will see it continue to drive change for many years to come.

Edgetech provide a comprehensive range of rigid and flexible spacer bars for virtually any application. For more information, please visit our website –

Edgetech (UK) Ltd
Stonebridge House
Rowley Drive
Stonebridge Trading Estate

+44 (0) 2476 639931