A modern refrigerator is a complex engineering structure, where each element performs its own function. The interior space that we see every day is almost entirely made of various polymer materials. Understanding what is the plastic in the refrigerator made ofis necessary not only for general development, but also for proper operation and care of equipment. It is the properties of the materials used that determine the durability of the shelves, resistance to odors and even the safety of stored products.
Many users don’t even think about why some parts are flexible and soft, while others are hard and loud when tapped. The difference lies in the chemical composition of the polymers, which are selected by engineers for specific tasks. Some varieties are designed to withstand low freezer temperatures, others must be inert to fats and acids, and others must have antibacterial properties.
In this article we will examine in detail the main types of plastics used in refrigeration equipment, their labeling and operating features. You will learn why you should not wash shelves with boiling water and what chemical reactions can occur if not properly cared for. This knowledge will help extend the life of your equipment Liebherr, Bosch or Indesit and keep food fresh.
Main types of polymers in the inner chamber
The interior lining of the refrigerator, shelves, drawers and door pockets are made from several main types of plastic. The most common material for the case and hard shelves is ABS plastic (acrylonitrile butadiene styrene). This is an impact-resistant engineering thermoplastic resin that perfectly retains its properties at low temperatures. It is thanks to ABS that the inner walls do not crack for years, even if a heavy pan or jar of pickles falls on them.
For transparent elements, such as door shelves or containers for vegetables, polystyrene (PS) or its modifications are often used. This material is highly transparent and rigid, but is more fragile to impact than ABS. In freezers where temperatures drop below -20°C, polypropylene (PP) can be used, which remains flexible even in severe frost. The choice of a specific material depends on the cost of the refrigerator model and strength requirements.
It is important to understand that different parts of the refrigerator can be made of different materials. For example, door seals are made of PVC or rubber-like materials, and handles can be covered with soft plastic for tactile comfort. Each component undergoes strict control for the release of harmful substances, since contact with food obliges manufacturers to comply with high safety standards.
Plastic markings and decoding of codes
So that the consumer can navigate the types of materials, special markings are applied to plastic products. Usually it is a triangle of arrows with a number inside and a letter code below. Knowing these symbols helps you determine whether a part can be washed in the dishwasher or exposed to heat. For refrigerators, the most relevant codes indicate suitability for contact with food.
Most often on the internal elements you can find the following designations:
- 🔹 PS (Polystyrene) — used for transparent shelves and containers; afraid of high temperatures and aggressive solvents.
- 🔹 PP (Polypropylene) - often used for freezer drawers; withstands heating up to 100°C and freezing.
- 🔹 ABS — the main structural plastic; is rarely marked, but is a standard for cases.
- 🔹 PE (Polyethylene) —can be found in flexible elements or gaskets.
Particular attention should be paid to the “glass and fork” icon. If it is present on the part, this ensures that the material has been tested for the migration of harmful substances into products. The absence of this sign on non-certified replacement parts may indicate that the plastic is intended for technical use only and can be toxic if in contact with food.
What does the number 6 in the triangle mean?
The number 6 corresponds to polystyrene (PS). This material is highly flammable and releases styrene when burned. However, under normal operating conditions of the refrigerator, it is absolutely safe and stable. The main limitation is not to heat such parts above 80-90 degrees.
Safety of materials and interaction with products
The question of whether plastic in the refrigerator is harmful is of concern to many housewives. Modern materials used by leading manufacturers of household appliances undergo rigorous testing. Food-grade plastic inert: it does not react with acids, fats, alkalis and alcohols that may be contained in products. This means that storing lemon, meat or marinade in a plastic container inside the refrigerator is safe.
However, there are nuances associated with the condition of the plastic itself. If deep scratches, cracks or chips appear on the surface, bacteria and mold can accumulate in them, which are difficult to wash out. In such cases, the microstructure of the material is disrupted, and it may begin to emit foreign odors or even microparticles. Regularly inspecting the interior to ensure the integrity of the coating is an important part of hygiene.
⚠️ Attention: Never store food in the refrigerator in open aluminum foil or uncoated copper containers. Contact of metal with wet plastic under certain conditions can cause electrochemical corrosion or accelerate degradation of the polymer surface.
It is also worth remembering the temperature regime. Although the refrigerator's plastic is designed to withstand cold temperatures, sudden temperature changes (such as placing a hot frying pan on a shelf) can lead to local deformation or the release of volatile substances. Even if the material is formally heat-resistant, such experiments shorten its service life.
Comparative table of material characteristics
For clarity, consider the main differences between the materials used in refrigeration equipment. This information will help you understand why some parts behave differently than others when cleaned or loaded.
| Material | Temperature conditions | Strength | Transparency | Basic application |
|---|---|---|---|---|
| ABS plastic | from -40°C to +80°C | High, impact-resistant | Opaque | Internal walls, shelves |
| Polystyrene (PS) | from -10°C to +70°C | Medium, fragile | High | Door shelves, drawers |
| Polypropylene (PP) | from -20°C to +130°C | High, elastic | Translucent | Freezer boxes |
| Tempered glass | from -50°C to +200°C | Very high | High | Main shelves |
As seen from tables ABS plastic is the most versatile material for structural elements due to the combination of strength and frost resistance. Glass is used where maximum load and hygiene are important, since it does not absorb odors at all. Polypropylene wins in heat resistance, which makes it ideal for freezers where defrosting is possible.
☑️ Checking the condition of the plastic
Rules for the care and cleaning of plastic elements
Proper care of the internal plastic surfaces of the refrigerator is the key to its longevity. Aggressive chemistry can destroy the structure of the polymer, making it cloudy, sticky or brittle. It is strictly not recommended to use abrasive powders, high concentrations of chlorine-containing bleaches and organic solvents (acetone, gasoline). They can cause chemical cracking or dissolution of the surface layer.
For daily cleaning and prevention, it is enough to use warm water with the addition of a mild dishwashing detergent or a weak solution of baking soda. These products effectively remove grease and odors without damaging polymer coating. If you use glass cleaning sprays, make sure that they do not contain large quantities of ammonia, as it can adversely affect some types of transparent plastic.
An important point concerns washing in the dishwasher. Although many modern plastics are labeled dishwasher safe, interior refrigerator shelves often have complex geometries and can be mounted on metal guides. When washing in a machine, thermal expansion may occur, which will cause the shelf to no longer fit into place. In addition, aggressive salts and rinsing agents in the dishwasher can accelerate the aging of the material.
Typical problems and their solutions
Over time, refrigerator owners may experience changes in the appearance or properties of the plastic. The most common problem is yellowing of the white plastic. This is a natural oxidation process under the influence of light (if the refrigerator is located near a window) or heat from the compressor. Yellowness can also appear from contact with certain types of products or detergents. It is difficult to return the original color, but you can use special plastic restorers.
Another problem is the appearance of cracks. Most often this is the result of mechanical shock at low temperatures, when the plastic becomes less elastic. If a crack appears on a shelf, it is better to replace it, since bacteria will multiply in the cracks. If we are talking about a decorative trim, you can use food-grade sealant for temporary insulation, but this will not solve the problem of aesthetics.
⚠️ Attention: If you smell a strong smell of “melted plastic” from a working refrigerator, this is not always a problem with the internal plastic. Most often, this is the smell of wire insulation or an overheating motor-compressor. In this case, you must immediately disconnect the device from the network and call a technician.
Stickiness of surfaces is a rare but possible defect that occurs when plasticizers in low-quality plastic are destroyed or when inappropriate chemistry is used. Such surfaces must be thoroughly washed with alcohol (isopropyl) or a special plastic cleaner to remove the degraded layer.
Frequently asked questions (FAQ)
Can plastic refrigerator shelves be washed with hot water?
Using boiling water (100°C) is not recommended, as a sudden temperature change can cause deformation or the appearance of microcracks, especially if the shelf was in the freezer. The optimal water temperature for washing is 40-50°C.
Is yellow plastic safe for storing food?
The change in color (yellowness) itself does not make the plastic toxic. This is the result of oxidation of the material. However, if the color change is accompanied by an unpleasant odor or stickiness, it is better to replace such a shelf, since the structure of the material is damaged.
What is the best way to wash the plastic inside the refrigerator?
It is best to use warm water with a mild dishwashing detergent, baking soda solution, or specialized products for caring for household kitchen appliances. Avoid abrasives and chlorine.
Why did the plastic box in the freezer crack?
Plastic in the freezer becomes more brittle. The crack could have formed due to a mechanical shock (for example, a heavy frozen package fell), overloading the box, or a manufacturing defect in the material that could not withstand extremely low temperatures.