Plastic Recycling 201: What’s Up With Plastic Recycling

Plastic Recycling 201

“Can we still recycle plastics?”  “What about #6?”  “What do the numbers mean?”  “Styrofoam is marked, doesn’t that make it recyclable?” 

People have a lot of questions about plastics and recycling.  Here’s what you need to know.

Recycling Simplified

Don’t worry about the numbers.  That’s right!  The numbers don’t mean anything to you as the consumer.  The numbers only mark what type of plastic the object is made of, not whether it is recyclable.  Our recyclables are sorted at a Materials Recovery Facility (MRF) and they can only process plastic bottles and containers.  If you’re wondering whether a plastic item is recyclable, ask this question: is it a bottle or container that’s in the accepted size range?  To aid you with that, we’ve made the handy chart at the end of this post!

Size Matters

Plastic bags contaminating a bale of paper.

When it comes to recycling plastics, size and shape matters.  Anything smaller than 3 inches in both height and diameter is too small to be processed.  A good rule of thumb is: make a circle with your middle finger and thumb; if the item fits through that, it’s too small to be recycled.  If small items make it to the MRF, they’re either going to fall through the lines and end up in their trash or get sorted improperly in a bale and become contamination like the plastic bags mixed up with paper pictured on the right.  This is why it is so important to put lids back on the plastic container rather than recycling them separately.

Anything larger than 5 gallons is over-sized for the sorting facility and won’t fit through the machinery.  But that doesn’t mean you have to throw it away.  You can donate items like intact plastic toys or laundry baskets to second-hand stores.  Even if it’s not reusable to you, it might be to someone else or the store might be able to make use of it.

To find places to donate large items or specialty places that recycle undersized items like pill bottles or bottle caps, check out our database: STLCityRecycles.com/database

Definite No’s

The cardboard is recyclable but the plastic is not.

  • Never put plastic bags in your Blue Bin!  They clog up the machinery and can cost the MRF up to 5 hours a day to manually cut out of the gears.  Or if they do make it through, they contaminate paper bales like the one pictured above.  Bales that are visibly contaminated have a high likelihood of being rejected by the material buyer and landfilled.  Check out this post for more on the impacts of plastic bags.  It’s also important to never bag up your recycling–it will get pulled off the line and sent to the landfill!

    Plastic packaging like this is not recyclable because it’s not a bottle or container.

  • Styrofoam is also a definite no.  Styrofoam is not recyclable in your Blue Bin period, regardless of whether it’s a container.  See our database for places that will accept shipping foam.
  • Many products are packaged in plastic like the ones pictured on the right.  This type of plastic, including pouches, is not a container and therefore cannot be recycled.  (But bulk items that come in buckets or tubs that are less than 5 gallons can be recycled!)

Click here for more info on plastic film recycling.

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