How Do Garbage Bags Contain The Foulest Of Smells?

Every time there’s a bad smell in the office and we can’t pinpoint the exact source, we follow a protocol – everyone in the office clears out their desks, fills their trash bins and empties the contents in the ‘main’ trash bag of the office, which is subsequently carried out to the dumpster. As soon as this is done, the bad smell simply disappears!

It’s clear that the smell is usually due to half-eaten food sitting in someone’s desk from the previous day, but what’s really interesting is that once all the office trash is deposited in the main garbage bag, it doesn’t stink anymore! Clearly, the garbage bag does its work quite effectively.

Black garbage bag

Containing vile stinks for ages! (Photo Credit : Pixabay)

So, what is it about garbage bags that make them so good at containing such a wide range of strong and vile smells within their ‘plastic boundaries’?

This can be answered by looking at a few typical properties of garbage bags.

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How are garbage bags made?

Garbage bags were invented by Harry Wasylyk, a Canadian inventor who had apparently had enough of the old method of letting garbage pile up in germ-ridden metal containers.

Garbage bags are made from polyethylene – a flexible but tough plastic commonly used in insulation and packaging. The thing about polyethylene that makes it such a perfect candidate as a garbage bag is that it’s resistant to moisture and many chemicals, and has superb insulation properties.

Skeletal formula of a polyethylene monomer

Skeletal formula of a polyethylene monomer. (Photo Credit : Magmar452 / Wikimedia Commons)

Garbage bags are created in large plants using heavy machinery. They are not produced individually, but are instead created in long tubes, then cut and separated to produce individual bags of different sizes.

How do garbage bags hold foul smells?

Garbage bags fight bad odor with the help of two plastics blended into different materials that make up the outside and inside layers. There’s an odor filler/absorber on the inside layer, which helps to keep the stink inside the bag. Plus, there’s a masking scent added to the outside layer, so all bad smells coming from the contents of the garbage bags can be masked.

Oxygen Transmission Rate

The smell-containing powers of garbage bags can be attributed to something known as the Oxygen Transmission Rate (OTR). The name is quite self-explanatory, referring to the steady state rate at which oxygen gas permeates through a film of plastic at given temperature and humidity conditions.

Plastic oxygen transmission rate

Notice the low OTR in the setting on the left.

Some plastic films are made to have a very low OTR, so that they let as little oxygen as possible through their surface. This is achieved with the help of particular resins that are blended in the base film when a plastic object is manufactured.

Garbage bags, at least good (and therefore, expensive) ones, have a very low OTR, and as such, they don’t let oxygen and tiny ‘foul-smelling particles’ permeate them.

That’s essentially why garbage bags are so good at containing even the worst smells from your daily rubbish!

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About the Author

Ashish is a Science graduate (Bachelor of Science) from Punjabi University (India). He spearheads the content and editorial wing of ScienceABC and manages its official Youtube channel. He’s a Harry Potter fan and tries, in vain, to use spells and charms (Accio! [insert object name]) in real life to get things done. He totally gets why JRR Tolkien would create, from scratch, a language spoken by elves, and tries to bring the same passion in everything he does. A big admirer of Richard Feynman and Nikola Tesla, he obsesses over how thoroughly science dictates every aspect of life… in this universe, at least.

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