We are Birpet. We are passionate about packaging. We love great work. read more

The Numbers On Plastic Bottles: What Do Plastic Recycling Symbols Mean?

The Numbers On Plastic Bottles: What Do Plastic Recycling Symbols Mean?

Print Email
(2 votes)

Plastics are everywhere – in food containers and toys, in cosmetics packaging and household utensils. While some plastics are eco-friendly and may be safe for kids, others contain harmful chemicals or cause dangerous pollution during manufacturing.

Have you ever wondered what the numbers, or recycling symbols mean at the bottom of plastic bottles and containers? Did you know that, while the use of all plastics should be limited if at all possible, some are safer than others? It’s time to learn a little bit about the various plastics you use and drink/eat from every single day, and what impact they have not only on you, but also the environment.

Plastic Numbers

Every plastic container or bottle has a recycling symbol. The symbol is a number, ranging from 1 to 7, within a triangle. While you may think nothing of these symbols, they can actually offer a great deal of information regarding the toxic chemicals used in the plastic, how likely the plastic is to leach, how bio-degradable the plastic is, and ultimately the safety of the plastic.

If you’ve been concerned, here is a handy chart that identifies the good, bad, and OK plastics and where they are found. Find out here:

Which Plastics Are Safe?

You can look for plastics that are safer for your family and the environment. So get to know the recycling codes imprinted on the underside of plastic products.

Look for these numbers before you buy:

  • Safer choices are coded 1, 2, 4 and 5. 
  • Avoid 3, 6 and most plastics labeled 7.

Here’s what you should know about each code:


Qualities: Thin, clear

Common usage: Bottles for water, cooking oil, peanut butter, soda 

Studies indicate that this plastic is safe for one-time use. As a precaution, however, these bottles should not be reused or heated. This plastic can be recycled once into new secondary products such as fabric, carpet or plastic lumber.


Qualities: Thick, opaque

Common usage: Milk and water jugs, juice bottles, containers for detergent, shampoo and motor oil, and toys

Limit how often you refill containers made of HDPE. It can be recycled one time into products similar to those made of recycled Code 1 plastic.


Qualities: May be rigid or flexible

Common usage: Bibs, mattress covers and commercial-grade plastic wrap, as well as a few types of food and detergent containers

Avoid it. The manufacture of PVC creates dioxin, a potent carcinogen that contaminates humans, animals and the environment. PVC may also contain phthalates to soften it. These hormone disrupting chemicals have been linked to male reproductive problems and birth defects. PVC is not easily recycled, but some recycling plants may accept it.


Qualities: Soft, flexible

Common usage: Grocery store bags, plastic wrap for household use and garbage bags

LDPE is one of the safer plastics, but recycle it – and limit waste by bringing reusable bags when you’re shopping.


Qualities: Hard but flexible

Common usage: Ice cream and yogurt containers, drinking straws, syrup bottles, salad bar containers and diapers

PP is one of the safer plastics, but be sure to recycle wherever possible.


Qualities: Rigid

Common usage: Styrofoam coffee cups and meat trays; opaque plastic spoons and forks

Avoid it. PS can leach styrene, a known neurotoxin with other harmful health effects.


Code 7 is a grab bag. It includes polycarbonate, a plastic made from BPA, a harmful synthetic estrogen. Manufacturers use polycarbonate to make five-gallon water bottles, sports bottles, clear plastic cutlery or the lining of metal food cans. New plastic alternatives to polycarbonate, such as co-polyesters, are marked Code 7 as well.

This code also includes some new, compostable green plastics, such as those made from corn, potatoes, rice or tapioca. Bio-based plastics hold promise for reducing waste, but you must put them in regular trash or your city’s compost containers, not in standard recycling bins. Bio-based plastics cause huge problems if they enter the normal plastic recycling stream.

Investigate #7 and avoid polycarbonate. Don’t heat or reuse bio-plastics unless they are expressly designed for that.

Remember: Whatever plastics you choose, never heat them in the microwave or subject them to other extreme stresses, like being kept in a hot car. Always recycle or throw away containers once they start to crack or break down.



Last modified on Wednesday, 17 April 2019 10:04

Talk to us

+90 216 575 5565