A modern household refrigerator is a complex unit, where each element performs a strictly defined function. If the metal housing and compressor are responsible for tightness and cold production, then plastic parts they provide comfort, space organization and effective distribution of temperature flows. Owners often underestimate the role of polymers, considering them only a decorative addition, however, without high-quality plastic components, operating the equipment would be impossible or extremely inconvenient.
The internal space of the camera is filled with various elements: from transparent shelves to complex air damper systems. It engineering plastic allows you to create complex geometric shapes that can withstand temperature changes and contact with moisture. Understanding the purpose of these elements helps to quickly find faults and properly care for the device, extending its service life.
In this article we will look in detail at what plastic components are used in the design, why they crack and how to choose the right replacement. You will learn that even a small plug can affect energy consumption, and the condition of the seal is directly related to the shelf life of products.
Main functions of plastic elements in the design
The main task of internal plastic parts is zoning organization of useful volume. Shelves and drawers allow you to separate products into categories, preventing them from getting mixed up and damaged. In addition, plastic has excellent thermal insulation properties, which minimizes heat exchange between the shelves and walls of the chamber, helping the compressor operate as normal.
Another critical function is waterproofing and protection of electronic components. Plastic grooves and trays collect condensate and melt water, discharging them into the evaporator. Without these elements, moisture would end up on food or, worse, on electrical control circuits. Plastic is also used to create air channelsdirecting the cold flow from the evaporator to the products.
It is important to note that modern food plastic must be chemically inert. It does not react with acids found in fruits or fats. This prevents the appearance of foreign odors and changes in the taste of products. ABS plastic and polystyrene used in production undergo strict safety certification.
Types of plastic shelves and their features
Shelves in the refrigerator are divided into glass and plastic frame and completely plastic. Edging made of polymer is necessary to prevent glass chips and create a sealed side so that spilled liquid does not flow down to the lower levels. Such structures are easy to clean and can withstand significant weight of workpieces.
Fully plastic shelves are often found in freezers or in budget models of refrigerators. They are usually made of impact-resistant polystyrene. Their main advantage is their low weight and the ability to create complex shapes, for example, with retractable sections or folding parts for placing tall bottles.
- 🧊 Standard shelves: flat surfaces with a side, often mounted on metal guides.
- 🍷 Wave-shaped shelves: special recesses for stable storage of bottles with drinks.
- 🔄 Transformers: folding structures that allow you to change the configuration of the internal space.
When operation, it is important not to overload the shelves beyond the norm. Although plastic is durable, prolonged static load leads to the appearance of microcracks. This is especially true at low temperatures, when the material becomes more brittle. deformation and the appearance of microcracks. This is especially true at low temperatures, when the material becomes more brittle.
Storage system: boxes and containers
The lower part of the refrigerator and freezer compartments is occupied by drawers. These plastic parts are intended for storing vegetables, fruits, meat and semi-finished products. “Fresh zone” containers often have perforations or special dampers to regulate humidity, which allows you to preserve vitamins in products longer.
In the freezer, the drawers experience maximum load. Low temperatures make the plastic hard, and frequent opening and closing creates mechanical stress. This is where sliding skids most often break front walls or come off. High-quality boxes are made of frost-resistant polypropylene, which retains elasticity even at -24°C.
Particular attention should be paid to the guide system. The boxes move on plastic rails or telescopic slides. If these elements are deformed, the box begins to jam or fall out when opened. Adjusting the position the box often solves the problem of jamming without replacing parts.
Why does plastic turn yellow?
Over time, under the influence of ultraviolet radiation and oxidative processes in plastic flame retardants (fire resistance additives) are destroyed. This causes the color to change from white to yellow. You can return the whiteness using special chemicals based on hydrogen peroxide, but this requires disassembling the part.
Seals and insulating elements
One of the most important plastic (more precisely, rubber-plastic) parts is sealing collar doors. It ensures the tightness of the chamber, preventing cold air from escaping and warm air from penetrating inside. Up to 30% of the refrigerator's operating efficiency depends on the condition of the seal.
Inside the seal profile there is often magnetic tapewhich tightly presses the door to the body along the entire perimeter. If the plastic loses its elasticity, cracks or tears, ice forms in the chamber and the compressor begins to work without interruption. Replacing the seal is a simple procedure that you can do yourself.
⚠️ Attention: When installing a new seal, it must be heated with a hairdryer or hot water to straighten out creases formed during transportation. Cold plastic may not fit into the groove correctly.
Insulating elements also include plastic inserts in doors and walls that hide the layer polyurethane foam. They protect the insulation from moisture and mechanical damage. Damage to the inner lining of the door can lead to peeling of the plastic from the metal and disruption of thermal insulation.
☑️ Checking the condition of the seal
Control mechanisms and guides
The internal structure of the refrigerator cannot do without many small parts: handles, buttons, latches and guides. Shelf guides allow you to adjust the installation height depending on the dimensions of the products. They are made in the form of plastic slats with holes or rails along which the shelves slide.
Door and drawer handles are the elements that are subject to the greatest mechanical stress. In modern models they are often integrated into the body, but in many refrigerators they remain separate plastic lining. If the handle breaks, the door becomes inconvenient to open, which can lead to distortion and damage to the hinges.
In No Frost systems, plastic dampers and air ducts play an important role. They direct flows of cold air from the evaporator to different areas of the chamber. If such a damper jams or breaks, food may freeze in one part of the refrigerator, and spoil in another from the heat.
Hidden fasteners
Many plastic panels inside the refrigerator are not held on by screws, but by plastic latches. When dismantling, you must act extremely carefully, using a flat spatula, so as not to break the fasteners.
Repair and replacement of damaged parts
If a plastic part is cracked, do not rush to throw away the entire refrigerator. Many damages can be repaired. To repair shelves and drawers, there is special glue for plastic (based on dichloroethane or acetone), which “welds” the edges of the crack. However, such repairs are temporary and cannot withstand heavy loads.
The most reliable method is replacing a part. To do this, you need to know the exact model of the refrigerator. Often the same drawers or shelves fit a whole series of models from the same brand. Buying a used part or an analogue can cost much less than the original, but requires careful inspection for chips.
When installing a new part, make sure that it fits correctly into the grooves. Incorrect installation can cause the drawer to fall out or scratch the walls of the chamber. Lubricating the guides Food-grade silicone will facilitate movement and prevent squeaking.
Comparison of materials and their durability
Not all plastics are the same. The table below shows a comparison of the main materials used in the production of internal elements of refrigerators.
| Material | Application | Temperature conditions | Impact resistance |
|---|---|---|---|
| ABS plastic | Internal panels, shelves | from -20°C to +80°C | High |
| Polystyrene | Boxes, transparent elements | from -10°C to +70°C | Medium (fragile in cold) |
| Polypropylene | Freezer boxes | from -30°C to +100°C | Very high |
| Polyurethane foam | Thermal insulation | from -50°C to +90°C | Low (soft) |
The choice of material depends on where the part will be used. Polypropylene is critical for the freezer, since ordinary polystyrene at -20°C can burst from a slight blow. In the refrigeration chamber, where temperatures are above zero, cheaper and more aesthetically pleasing ABS plastic is successfully used.
The service life of plastic parts directly depends on operating conditions. Aggressive cleaning agents, abrasive sponges and hot water accelerate the aging of the material. Use mild detergents and warm water to care for the internal surfaces.
Frequently asked questions (FAQ)
Is it possible to glue a cracked drawer refrigerator?
Yes, you can use special glue for plastic or two-component epoxy resin. However, the gluing area will be less durable, and at low temperatures the crack may extend further. For a freezer, such repairs are often temporary.
How to wash plastic shelves so that they do not turn yellow?
Use mild solutions of soda, vinegar or special dishwashing detergents. Avoid chlorine-containing bleaches and abrasive powders, which damage the protective layer and accelerate the oxidation of the material.
Why does a refrigerator door handle break?
Most often this happens due to material fatigue or mechanical shock. Plastic loses its elasticity over time, especially if the refrigerator is in the kitchen with direct sunlight. Sharp tugging also leads to breakage of the fasteners.
Where can I find the replacement part code?
The code (part number) is usually indicated on the part itself, often in the form of a sticker or embossed on the back side. The number can also be found in the operating instructions or on the manufacturer’s website, knowing the model of the refrigerator.