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  • Writer's pictureHooman's Friend

The hidden plastics in our clothes and dog products

Why you should minimise Polyester usage

Have you noticed that dogs have their own little fashion departments at Zara and River Island yet? Guess what the clothes are made of? Only the cheapest quality for your pup.

Some dogs show allergies to man-made synthetics like polyester, nylon and cotton blends, as many additives are added during the production process. Many dog owners are beginning to switch to natural dog products to avoid the toxic byproducts.

Polyester is the most common fabric used in our clothes for daily wear and accessories for our pets. Polyester or Polyethylene terephthalate (PET) is a man-made synthetic fibre known as Polymer, which can be woven into many forms to create textiles. According to the Global Preferred Fiber Market Report from 2020, 62% of all fibres produced worldwide were of synthetic origin. The rise of Polyester started in the 1970s due to its low price and high durability.

Mircoplastics in fish
Scientists are finding microplastics even in the rural mountain ranges of the Himalayan

How does Polyester work?

Polyester fabric is a durable material that can stand up against wear and tear. It's made from the polymerization of petroleum-derived ethylene glycol and purified terephthalic acid, which melts when heated to produce polyethene terephthalate (PET). Manufacturers then push this semi-crystalline fibre through spinners until it has been woven together into fabrics for your clothes or pet products.

Characteristics of Polyester: The Good, the Bad and the Ugly

There are many reasons why Polyester earned the top price as humanity's "favourite" material beyond its low price.

It's durable

The fibres are robust, meaning they don't tear or stretch. So a machine wash doesn't damage it, and it doesn't require extra care.

It's moisture-resistant

It's plastic, so it resists droplets. Natural fibre like cotton or hemp will soak up moisture, whilst Polyester will resist it. This characteristic will make your polyester garment feel hot. We wonder what your dog would think with the garment sticking to their body?

It retains shape

Polyester is quite wrinkle-resistant. It feels like a godsend to iron less and live more in busy times.

PET itself is not toxic

Otherwise, we wouldn't be able to drink out of plastic bottles. The problem is more all the chemicals added to Polyester during its production processes, like dyes, bleaches, and composite components, can make it toxic.

That all sounds pretty okay, doesn't it....?

We all know: There is always a "but".

Scientists and microplastics
Microplastics are shedding whilst we're wearing our clothes

Polyester and microplastics

After reading the above, we have a good understanding of how polyester is created. Not surprisingly, everywhere scientists look these days, they're finding microplastics: On Mangrove beaches, arctic ice, Himalayan mountains, and in our food and drinks. Also, in our animals and us.

A recent December 2019 study found that wearing polyester clothes sheds more microplastic fibres than washing (Study by IBCB-CNR. You can read the complete study here). The Chief of the University of Plymouth explained:

The key story here is that the emission of fibers while wearing clothes is likely of a similar order of magnitude as that from washing them. That constitutes a substantial and previously unquantified direct release to the environment.

To put it bluntly. If you're wearing Polyester, you're shedding like your furry friend. But whilst they're shedding biodegradable material, we are shedding material that will take several hundred years to degrade.

We don't understand the full health implications of plastic in the food chain and our bodies. More research is underway to understand how microplastics interact with our immune system. But if something doesn't biodegrade and moves up the food chain, it doesn't sound like good news to me.

Unsurprisingly, we are not entirely done with the "buts" yet.

Polyester and water pollution

All the chemical production of polyester fibre is a dirty business. Factories that are not using proper wastewater treatment systems are releasing damaging substances into the environment, like antimony, cobalt, manganese salts, sodium bromide, and titanium dioxide. Polyester can also not be naturally dyed. Instead, it requires chemical dyes that are again emitted into water streams. Some were found to be carcinogenic.

Polyester and fossil fuels

Fossil fuels, such as crude oil, coal, and natural gas, are extracted with many energy use and are chemically intense. The processing of fossil fuels undoubtfully leads to global warming and is linked to waterway poisoning. Burning fossil fuels is unsustainable, and by adjusting our demand for Polyester and nylon, we can reduce it.

What about recycled Polyester?

Globally just 12% of the material used for clothing is recycled (Source). What makes recycling clothes so tricky is that nowadays, clothes don't only contain one material. They're woven blends with elastane and nylon; they have zips and buttons or are dyed with a range of dyes. That makes recycling clothes very labour intensive. Therefore, most fashion brands use recycled plastic bottles to make new clothes.

RPet (recycled PET) can be mechanically or chemically recycled. Mechanical recycling is taking a plastic bottle, washing it, shredding it, and turning it back into polyester chips. These are then melted down and transformed into fibres that can be spun into clothes. It doesn't allow the recycling of different types of plastic because it is too labour-intense.

The quality of the rPET also suffers as mechanically recycled plastic can't be recycled forever. When you buy products from recycled Polyester, be aware that the rPET has been most likely mechanically recycled. It will most likely not be from 100% rPET and will have virgin polyester elements to keep it durable and to a certain quality standard.

However, the chemical solution is not yet scalable and expensive, offering some hope. Chemical recycling, also called depolymerization, takes a waste plastic product and returns it to its original monomers, indistinguishable from virgin Polyester. The quality of the chemically recycled rPET and virgin plastic is the same. This type of recycling is what we would call a "close loop", as we wouldn't produce new plastic.