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What springs to mind when you're asked to think of plastic chairs? Do you picture the ubiquitous lightweight, stackable polypropylene chair sold cheaply in hardware stores worldwide?

Or perhaps you picture something more glamorous, such as Shiro Kuramata's (1988). This limited-edition artwork, featuring imitation roses suspended in acrylic resin, now sells for more than at auction.

I research industrial design, exploring the symbiotic relationship between technology, commercial design and sustainability. The 80-year history of the plastic chair was the focus of my Ph.D.

This humble, ubiquitous object offers unique insights into society's shifting attitudes to plastic, and the changes to come.

An 80-year history

The story of the plastic chair began in the United States in the 1930s, when petrochemical manufacturers DuPont and Rohm & Haas started mass-producing acrylic glass.

The material, available in rods and sheets, enabled industrial designers to produce a of using traditional manufacturing techniques.

Widespread shortages of traditional materials during World War II drove further development of plastics.

After the war, designers and manufacturers quickly embraced plastics. They were seen as the foundation of a new, plentiful future, allowing the masses to access products previously reserved for the elite. Many household items such as televisions, toys and upholstery became cheaper, thanks to plastics.

Fiberglass manufacturing advanced during WWII to support the US Navy. This involves weaving strands of glass into a loose mat, which is then placed into a mold. Polyester resin is poured in to bind the fibers together before it hardens into a solid shape. Fiberglass is strong, lightweight, corrosion-resistant and can be molded into complex shapes.

The first fiberglass chair designs were Charles and Ray Eames' and Eero Saarinen's . Then the Space Age (1957–69) inspired enthusiastic experiments with technicolor-saturated glossy surfaces and futuristic curved shapes, all made possible by fiberglass.

Designers could handcraft prototypes, perfecting comfort and form. Many designs from this era are still in production and often feature in .

A shift in public sentiment

Looking back at Earth from space was a turning point for humanity. The famous captured the precarious nature of our existence and dependence on finite resources, such as fossil fuels. Oil was used to make most plastic at that time.

In the 1970s, the price of shot up tenfold when Arab nations banned petroleum exports and cut oil production during the Arab–Israeli War. The followed. In 1981, oil reached US$31 per barrel. Suddenly, plastics were expensive.

Early plastics also had drawbacks. Colors faded and surfaces scratched, eroding consumer confidence. Disillusioned consumers began to favor traditional materials such as metal and timber. Few noteworthy plastic chair designs appeared during the next two decades.

In response, the plastics industry changed tactics. If consumers favored wooden furniture, then woodchips and veneer—held together by polymer adhesives and varnished with polyurethane—offered a cost-effective solution. Plastics were simply camouflaged within an ever-increasing range of products.

As the environmental impacts of plastics became evident, the industry recognized it had an and launched a major public relations effort around recycling. It worked. By the end of the century, plastics were fashionable again.

Recycling eases guilt

From the late 1990s, leading designers enthusiastically embraced injection molding. This was much cheaper and faster than labor-intensive fiberglass.

Philippe Starck's for Kartell launched a new trend for translucent chairs. Karim Rashid launched the affordable and Jasper Morrison introduced air injection molding to the industry with the .

The revival was brief. The limitations of gradually became more widely understood. Of the 8.3 billion tons of plastic produced by 2020, just , or more accurately "downcycled" such as by for clothing.

Ocean pollution became a focus when it was shown that by 2050, there will be in our seas. Alarm further intensified over the impact of chemical additives used in plastics and their effects on and the ability to .

In response, designers and manufactures are now exploring plastics made at least partly from recycled plastics or renewable organic resources such as plants, algae or even carbon dioxide (bioplastics).

My study of identified the as the best of the bunch. Made from just 2.8kg of plastic waste, the design minimizes the amount of energy required to make and transport the chair.

These chairs come off the automated production line stacked 12-high for efficient transport. The manufacturer Magis also claims Bell Chairs can be recycled at end-of-life. But the lack of a mark, and the inclusion of fiberglass, make it unlikely the product will actually be recycled.

I thought my study would identify chairs made from bioplastics as delivering superior environmental outcomes. However, designers working with these materials were forced to compensate for inferior material strength by bulking up their designs, or mixing bio-based material with traditional plastics.

Bulky designs demand higher energy consumption during manufacture and transport, while hybridized materials are problematic as they cannot be recycled and are not biodegradable.

The chair of the future

, and measures to and increase recycled content in packaging and products, are beginning to take effect. Manufacturers are also experimenting with renewable plastics in consumer goods.

But to achieve global emissions-reduction targets, the transition from virgin fossil-based plastics to renewable plastics must accelerate. Government intervention will be crucial where voluntary industry agreements are failing, both at and .

It's likely the plastic chair of the future will be made entirely from renewable organic resources. Creating a more circular plastics economy is not only possible, it's imperative.