What do the numbers and symbols on the bottom of plastic water cups mean?

The numerical symbol on the bottom of a plastic water cup is usually a triangular symbol called a “resin code” or “recycling identification number”, which contains a number. This number represents the type of plastic used in the cup, and each type of plastic has its own unique properties and uses. Here are common resin codes and the types of plastic they represent:

#1 – Polyethylene terephthalate (PET):

This plastic is commonly used to make clear beverage bottles, food containers and fibers. It is relatively easy to recycle and is commonly used to package food and beverages.

#2 – High Density Polyethylene (HDPE):

HDPE is a harder plastic commonly used to make bottles, buckets, detergent bottles, cosmetic bottles and some household items. It has better corrosion resistance and crack resistance.

#3 – Polyvinyl Chloride (PVC):

PVC is a plastic used to make pipes, plastic wrap, flooring, and more. However, it contains toxic substances, so in some cases caution is required when recycling and disposing of it.

#4 – Low Density Polyethylene (LDPE):

LDPE is a soft and heat-resistant plastic commonly used to make plastic bags, packaging films, disposable gloves, etc.

#5 – Polypropylene (PP):

PP is a plastic that is highly resistant to high temperatures and chemicals and is often used to make food containers, medical supplies, household items, etc.

#6 – Polystyrene (PS):

PS is usually used in foam plastics, such as foam cups and foam boxes, and is also used to make some household items.

#7 – Other Plastics or Mixtures:

This code represents other types of plastics or composite materials that do not fall into the categories 1 to 6 above. #水杯# This category includes many different types of plastic, some of which may not be easy to recycle.
These digital codes help people identify and sort different types of plastics for recycling, processing and reuse. However, be aware that even with a recycling identification number, local recycling facilities and regulations may affect whether certain types of plastic can be recycled.