What kind of plastic are the shelves in the refrigerator from: a complete analysis of materials

A modern refrigerator is a complex piece of engineering a structure where each part performs a strictly defined function. The internal space of the cells is usually divided into zones using horizontal partitions, which can be made of tempered glass or polymer materials. It is plastic shelves that raises the most questions among owners of household appliances, especially when it comes to their durability, safety and care. Understanding what this element is made of will help not only to properly care for it, but also to avoid dangerous situations during operation.

Visually determining the exact chemical composition of the material “by eye” is almost impossible, since modern technologies make it possible to impart any physical properties to polymers. However, manufacturers are required to label products, especially those that come into contact with food. Most often, impact-resistant, frost-resistant and food-grade plastics are used in the design of refrigerators. If you are wondering what kind of plastic the shelves in the refrigerator are made of, then the answer lies in the combination of several types of polymers, each of which is selected for a specific load zone.

The safety of materials used in refrigeration equipment is regulated by strict sanitary standards, since they are in direct contact with food. Unlike technical plastic, household versions should not emit toxic substances even at low temperatures. In this article, we will analyze in detail the main types of polymers, their labeling, operating features and methods for restoring integrity in case of damage.

Main types of polymers in the design of a refrigerator

Manufacturers of household appliances, when choosing materials for internal equipment, are guided by three main criteria: mechanical strength, resistance to temperature changes and inertness to food products. The most common material for the manufacture of shelf grates themselves, vegetable drawers and door barriers is ABS plastic (acrylonitrile butadiene styrene). This material has high impact strength, which allows it to withstand the weight of heavy pots or jars of pickles without cracking.

For transparent elements, such as drawer lids or decorative inserts, polystyrene (PS) or its more durable modification is often used. It has excellent transparency and rigidity, but is more fragile to impact compared to ABS. In some premium models you can find polycarbonate (PC), which is known for its exceptional strength and heat resistance, but its use is limited by the high cost of raw materials.

It is important to note that different parts of the same shelf can be made of different materials. The frame is often made from more flexible and durable polypropylene (PP), which can withstand freeze-thaw cycles without becoming brittle. At the same time, decorative elements or guides can be made of other composites. Understanding this difference is critical when attempting to repair or replace parts.

⚠️ Attention: Never use technical plastics or materials not labeled “Food Safe” to replace or repair refrigerator shelves. At low temperatures and in confined spaces, such materials can begin to release volatile organic compounds that are hazardous to health.

Each type of plastic has its own unique characteristics that determine its durability in refrigerated conditions. For example, polypropylene is valued for its chemical resistance, which allows you to wash shelves with aggressive but food-safe detergents without the risk of destroying the structure of the material.

Marking and identification of materials

For the consumer, the most reliable way to find out what kind of plastic the shelves in the refrigerator are made of is to study the markings. According to international standards, a triangle of arrows with a number inside and a letter code below must be printed on the back of plastic products that come into contact with food. This coding system allows you to accurately identify the type of polymer.

The following designations are most often found in refrigerators:

• ♻️ №5 (PP) — Polypropylene: the most common material for drawers and frames, withstands temperatures from -20°C to +140°C.
• ♻️ №6 (PS) — Polystyrene: used for transparent lids and hard inserts, is afraid of high temperatures and aggressive chemicals.
• ♻️ №7 (O/OTHER) — Other types: this often includes ABS plastic or polycarbonate, which have mixed properties.
• ♻️ №1 (PET/PETE) — Polyethylene terephthalate: less common, but can be found in some transparent elements, is highly durable.

Lack of marking does not always mean low quality, but in the case of refrigerators where food safety is important, it is better to double-check the documentation for the model. Sometimes the recycling logo is applied to the end of the part or to the inside of the guides, where the direct eye does not fall when the door is open.

Knowledge of the markings is necessary not only to understand the properties of the material, but also for proper disposal in case of breakdown. Different types of plastics require different processing conditions, and mixing them can complicate the process of recycling raw materials.

⚠️ Attention: Technical characteristics of plastics may vary depending on the manufacturer and the specific batch of raw materials. Always check the official owner's manual for your refrigerator model for exact material information.

In some cases, especially older refrigerator models, markings may have been applied with paint that has worn off over time. In such a situation, the material can only be determined by indirect signs: polypropylene is usually translucent and slightly flexible, while polystyrene is clear and hard, but fragile.

Strength characteristics and temperature conditions

One ​​of the main problems that owners face is cracking of shelves under load. This is often associated not so much with the weight of the products, but with thermal shock. Plastic, like any material, has a coefficient of thermal expansion. If you place a hot pan on a polystyrene shelf cooled to +4°C (even through a stand), local heating can lead to deformation or the appearance of microcracks, which will grow over time.

Impact resistance also varies depending on temperature. At room temperature, ABS plastic can withstand significant blunt force impact. However, when the temperature drops to -18°C (in the freezer), many types of plastic become more brittle. That is why shelves in freezers are usually made thicker or special frost-resistant composites are used.

For clarity, let's compare the main parameters of popular materials:

As can be seen from the table, polycarbonate is the leader in terms of the totality of characteristics, but its high price limits mass use. Most manufacturers choose a middle ground in the form of ABS or PP, providing a sufficient margin of safety for household use.

It is important to consider that long-term operation at extreme temperatures accelerates the aging of the material. The plastic may lose elasticity, turn yellow, or develop a network of small cracks known as “silvering.”

Features of care and cleaning of plastic surfaces

Proper care of the internal elements of the refrigerator directly affects their service life. Since we know what kind of plastic the shelves in the refrigerator are made of, we can choose the best cleaning products. Aggressive solvents, such as acetone, gasoline or high concentrations of chlorine bleach, can destroy the structure of ABS plastic and polystyrene, making them cloudy or sticky.

For daily cleaning and periodic washing, it is recommended to use:

• 💧 Warm baking soda solution (1-2 tablespoons per liter water) - perfectly removes grease and odors.
• 🍋 A weak solution of acetic acid - disinfects and removes scale, is safe for most plastics.
• 🧼 Specialized products for household appliances marked "for plastic."
• 🧽 Soft sponges and microfiber - avoid abrasive scrapers that leave scratches.

Particular attention should be paid to the temperature of the water when washing. If you remove the shelves from the refrigerator, do not immediately rinse them with boiling water. Sudden temperature changes are the main enemy of polymers. Allow the part to warm up to room temperature or use water with a temperature no higher than +40°C.

After washing the shelf, wipe it thoroughly dry. Residual moisture in places of fastening or in microcracks during freezing can expand and contribute to the destruction of the structure of the material. In addition, a humid environment promotes the growth of bacteria and the appearance of mold, especially in the porous structures of old plastic.

Repair and restoration integrity of shelves

If a crack or chip appears, many users think about repairs. The possibility of restoration depends on the type of plastic. Polypropylene (PP) and polyethylene (PE) are characterized by so-called “chemical inertness”, which is why they are extremely difficult to bond with conventional adhesives. An attempt to glue such a box with superglue (cyanoacrylate) most often leads to a temporary result, since the glue does not penetrate the structure of the material.

For reliable repair of plastic elements of the refrigerator, the following methods are used:

1. Thermal welding: The edges of the crack are melted with a special soldering iron for plastic or hot air with the addition of an filler rod from the same material.
2. Chemical welding: Use of special solvents (dichloroethane, tetrahydrofuran) that melt the edges of the plastic, joining them into a monolith. Suitable for ABS and PS.
3. Reinforcement: Plating a metal or plastic plate over the crack on both sides to strengthen the structure.

The most effective way for ABS plastic is to use "chloroform" (trichloromethane) or a special ABS adhesive that actually melts the surfaces, creating a permanent bond. However, you need to work with such substances in a well-ventilated area and away from products.

Is it worth repairing the shelf? If the crack is small and does not bear a load, repair makes sense. If the shelf bursts in the center under the weight of the products, it is better to consider the option of purchasing original spare parts. The restored part may not withstand the previous load and burst again at the most inopportune moment.

Replacement and compatibility of parts

If repair is impossible, the question of replacement arises. There are no universal plastic shelves, since the geometry of fasteners, runners and hooks is unique for each manufacturer (and often for each series of refrigerators). Trying to install a shelf from a different model may result in it simply not fitting into place or, worse, not holding securely.

When looking for a replacement, you need to know the exact model number of your refrigerator. It is usually indicated on a label inside the camera or on the back wall. Using this number you can find the catalog number (art. number) of a specific shelf.

What to look for when purchasing:

• 🔍 Geometry: The shape of the cutouts for bottles, the presence of sides and protrusions must match.
• 🔩 Type of fastening: Hooks, the slides or guides must perfectly fit the walls of the refrigerator.
• 🏷️ Material: It is advisable that the new shelf be made of the same or more durable plastic than the original.

Sometimes it is impossible to find original spare parts or they are too expensive. In this case, you can consider making a custom shelf in workshops that work with acrylic or polycarbonate. Sheet polycarbonate with a thickness of 4-6 mm often exceeds standard plastic in strength characteristics and can withstand significant loads.

⚠️ Attention: When installing a non-original shelf, make sure that it does not block the holes for cold air circulation. Disruption of air flow can lead to compressor malfunction and food spoilage.

Using thicker or stronger replacement plastic is an acceptable upgrade if dimensions allow. However, a shelf that is too heavy can create excessive load on the glass elements or the fastenings of the refrigerator itself, if they are also plastic.

Is it possible to use a shelf from another brand?

Theoretically, it is possible if all geometric dimensions and the fastening system match. However, manufacturers rarely make compatible systems. There is a chance of a match only within one concern (for example, some Indesit and Ariston models may have similar elements), but even in this case there is no guarantee. It is better to look for the original by the model code.

Frequently asked questions (FAQ)

Why does a plastic shelf in the refrigerator turn yellow over time?

Yellowing of ABS plastic and polystyrene is a natural oxidation process under the influence of oxygen, light (especially ultraviolet radiation) and temperature changes. The cause may also be fatty contaminants that are absorbed into micropores. Plastic can be bleached with special chemical compounds (for example, hydrogen peroxide activated by light), but it is not always possible to completely restore the factory color.

Is it safe to use a shelf with a small crack?

You can use a shelf with a crack only temporarily and with caution, without loading it with heavy objects. The crack is a stress concentrator and will grow. In addition, bacteria and mold accumulate in the crack, which are difficult to wash out. It is recommended to replace the part or carry out high-quality repairs by welding.

What is the best way to wash plastic boxes so that they do not crack?

Use only warm water (not hotter than 40-50 degrees) and mild detergents without abrasive particles. Avoid chlorine bleaches, which make plastic brittle. After washing, be sure to let the drawers dry completely at room temperature before placing them back in the refrigerator.

Is it possible to replace a plastic shelf with a glass one?

You can replace a plastic grill with glass only if the design of the refrigerator provides for such an option (the presence of guides for glass). Simply placing glass on plastic supports is dangerous - it may not have the necessary edges or fixation and will slide off. Ready-made glass inserts are sold as original spare parts for specific models.

Which plastic is the most durable for a freezer?

Special frost-resistant brands of polypropylene (PP) and polycarbonate (PC) are best suited for freezers. They retain elasticity at temperatures down to -40°C and below. Ordinary polystyrene (PS) becomes very brittle in the cold and can burst from a slight blow.