What pressure can a plastic bottle withstand?
02.03.2023

Plastic bottles are one of the most common types of packaging in modern production. They are used for storing and transporting various liquids, from water and drinks to oils and cleaning products. One of the main methods of producing plastic containers is blow molding using PET preforms. Preforms are made on special machines, then filled with gas and formed by blowing to create the final product. This process is fast, efficient, allows for the creation of containers of various shapes and sizes for the food, chemical, and other industries.

Contents

What determines the limits of strength

PVC container — it is a strong container capable of withstanding pressure. However, like any material, polymer has certain strength limits that depend on several factors.

The strength depends on its type and the quality of the polymer used. Different types of plastics have individual characteristics and withstand different pressure levels. Some types, such as polycarbonates and acrylic resins, have high strength. They withstand significant loads, while others, such as polyethylene and polypropylene, will be less durable.

The reliability of plastic depends on the thickness of the walls of the container. The denser they are, the more stable the capacity will be and the higher the pressure it will be able to withstand. But the thickness of the walls can be a sacrifice to save materials.

pressure on a plastic bottle

So, the pressure a plastic bottle can withstand depends on the temperature and the condition of the contents inside the container. When the temperature increases, the polymer becomes less strong, which can lead to a decrease in its ability to withstand the load.

It is also important to consider the state of the contents inside the container, as liquids and gases create different loads depending on their state (for example, whether the liquid is in a vapor state or not). For example, if there is gas in the container, its load will increase when the temperature rises, which can cause the polymer product to explode.

When a polymer container explodes, it usually happens due to exceeding its strength limit. If the pressure inside exceeds the strength limit of the manufacturing material or if the polymer is already damaged, the bottle may explode. Damage to the material of manufacture of products can occur due to mechanical effects, such as impacts, or due to the effect of chemicals on the walls of the product.

How many atmospheres can a PET bottle withstand

The limit values ​​depend on the material, wall thickness, geometry and volume of the container, as well as on the characteristics of the contents. For example, we will give approximate values ​​for some types of polymer containers:

Plastic bottles for drinks:

  • ✅ 0.5 l: about 4 atmospheres;
  • ✅ 1 l: about 3 atmospheres;
  • ✅ 2 l: about 2 atmospheres.

It is important to understand that these values ​​are given only for a general idea and are not accurate and universal. When choosing a container for a specific content, always consider the manufacturer's recommendations to ensure safe use.