Learning how to read the symbols on plastic containers is becoming increasingly important. Although many containers look similar at first glance, not all of them are made from the same materials or offer the same level of safety for storing food or drinks.
On the base of many bottles, food containers or packaging, you will find a triangle made of arrows with a number inside. These symbols indicate the type of plastic used and help identify whether that material is more suitable for single use, for reuse, or whether it may release certain substances over time.
Knowing what each code means can help you make safer and more sustainable choices in your everyday life, especially if you use reusable bottles or containers for water and food.
Why you should pay attention to the symbols on plastic containers
Many people reuse plastic bottles or containers without paying attention to the material they are made from. However, some types of plastic are designed for single use only and can deteriorate quickly when exposed to heat, impact, or time.
In addition, certain materials can release chemical substances when exposed to high temperatures or reused over a long period. Understanding these symbols makes it possible to identify which containers are safer for food and drinks and which ones are better avoided for everyday use.
It is also important from an environmental perspective. The codes help to sort waste correctly and make it easier to recycle each material.
In fact, the type of plastic is directly related to questions such as what BPA means or what the consequences are of using plastic bottles every day.
What each of the 7 plastic codes means
Plastic symbols are identified by numbers from 1 to 7 inside a recycling triangle. Each one corresponds to a different material.
Symbol 1: PET or PETE (Polyethylene terephthalate)
It is one of the most widely used plastics in water bottles, soft drinks, and beverage containers.
It is lightweight, transparent, and affordable, but it is generally intended for single use. Reusing it frequently or exposing it to heat can cause the material to deteriorate more quickly.
Therefore, although it is easy to recycle, it is not the most advisable option for prolonged daily use.
Symbol 2: HDPE (High-density polyethylene)
This plastic is used in more resistant containers, such as milk bottles, detergent bottles, and some reusable containers.
It is one of the materials considered safer among plastics because it has good chemical resistance and releases fewer substances.
Even so, over time and with wear it can also deteriorate.
Symbol 3: PVC (Polyvinyl chloride)
PVC is used in pipes, some food packaging, and industrial materials.
It is one of the most controversial plastics because it may contain chemical substances that raise more concerns about food safety. For this reason, it is generally not recommended for storing food or drinks on a regular basis.
Symbol 4: LDPE (Low-density polyethylene)
It is a flexible plastic found in bags, wrappings, and some soft packaging.
Although it is considered relatively safe, it is not commonly used in reusable bottles or containers for hot drinks.
Symbol 5: PP (Polypropylene)
Polypropylene is one of the most widely used materials in reusable containers, caps, and some food-grade packaging.
It has good heat resistance and is generally regarded as a safe option for food use.
Many reusable straws, sports caps, and children's containers use this material for its durability.
Symbol 6: PS (Polystyrene)
It is found mainly in disposable cups, food trays, and expanded polystyrene (foam) packaging.
It is not one of the most advisable materials for hot food or frequent reuse, as it can deteriorate easily.
Symbol 7: Other plastics
This group brings together different material blends that do not fit into the previous categories.
Some plastics in this group contain BPA or similar substances, although not all containers with symbol 7 include it. Precisely because of this lack of clarity, many people prefer to avoid this type of container for food and drinks.
Which types of plastic are best avoided for food and drinks
Although not all plastics are the same, many experts recommend limiting the prolonged use of certain materials, especially when it comes to hot drinks, daily reuse, or exposure to sunlight and high temperatures.
Containers designed for single use, such as many PET bottles (symbol 1), are not the best option for constant reuse. With wear, impact, and heat they can deteriorate more easily.
It is also generally advisable to avoid plastics such as PVC (3) or some materials included in group 7 when there is no clear information about their composition.
In general, the longer a container is going to be used for drinking water or transporting food, the more important it is to choose materials that are resistant, safe, and specifically designed for continuous use.
Safe alternatives to single-use plastic
In recent years, reusable stainless steel bottles have become one of the most popular alternatives to conventional plastic.
Food-grade 18/8 stainless steel stands out for several advantages:
- Does not retain flavours or odours
- Resistant and long-lasting
- Requires no inner lining
- Completely BPA-free
- Keeps drinks at the right temperature for longer
In addition, reusable bottles help to significantly reduce the consumption of disposable plastic in everyday life.
Today there are models suited to all kinds of needs: thermal bottles to keep water cold for hours, sports bottles, children's models, and thermal cups for coffee and tea.
When choosing a safe alternative, it is important to look at:
- Certified and toxin-free materials
- Quality of the stainless steel
- Leak-proof systems
- Ease of cleaning
- Real durability of the product
Understanding how to read the symbols on plastic containers does not mean demonising all plastics, but rather learning to use them in a more conscious and safe way. Knowing what materials we use every day helps us take better care of our health, reduce waste, and choose more sustainable options in the long term.
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