Detecting damage inside the chamber of a refrigeration unit is a stressful situation for any owner of household appliances. A crack on the inner wall of the refrigerator not only spoils the aesthetic appearance, but also creates serious risks for the safety of food and the performance of the compressor. Through the damaged plastic casing moisture begins to penetrate inside the insulating layer, which leads to corrosion, mold and increased energy consumption.
Depending on the depth and location of the damage, repairs can range from a simple cosmetic disguise to a complex operation to replace the internal lining. Ignoring the problem often leads to the microcrack growing, turning into a through hole through which freon or moisture circulates unhindered. In this article we will analyze proven methods plastic restoration and determine when self-repair no longer makes sense.
The first thing to do when a defect is detected is to assess its scale. If the damage is superficial and does not affect the refrigerant channels, the situation can be corrected at home. However, if you hear hissing or smell a chemical reagent, use of the device requires immediate termination.
Causes of cracks in plastic
The plastic used for the internal lining of the chambers is subject to constant stress. The main reason for the appearance of defects is compression of the material. When there are sudden changes in temperature, for example, when you put a hot pan on a shelf or often open a door in a hot room, the structure of the polymer weakens and bursts. thermal expansion and material compression. When there are sudden changes in temperature, for example when you place a hot pan on a shelf or frequently open a door in a hot room, the polymer structure weakens and breaks.
Mechanical stress is the second most common factor. Impacts from the edges of metal pans, falling of heavy foods, or careless defrosting using sharp objects (knives, screwdrivers) to chip ice instantly damage the integrity of the ice. Damage can also be caused by improper transportation when heavy objects press on a thin wall. ABS plastic. Damage can also result from improper transportation when heavy objects press on a thin wall.
⚠️ Attention: Using sharp metal objects to speed up defrosting is the most common cause of through holes. Never try to pick out the ice with a knife, this is guaranteed to damage the evaporator or the wall.
Another reason may be a manufacturing defect or the use of low-quality materials by the manufacturer. Cheap refrigerator models often have a thinner layer of inner coating, which deteriorates faster. Over time, plastic becomes brittle due to constant exposure to low temperatures and ultraviolet radiation if the refrigerator is located near a window.
Diagnostics of damage: superficial and through
Before starting repairs, it is necessary to accurately determine the nature of the damage. Surface scratches and cracks affect only the decorative layer and do not require complex intervention. Their main danger is the accumulation of bacteria and dirt, which are difficult to wash out. To eliminate them, it is enough to lightly polishing or apply a special composition.
Through cracks pose a real threat. Through them, warm air enters the evaporator, forcing the compressor to work in increased mode. This leads to the formation of a “coat” of ice even in No Frost systems. If the crack is in the evaporator area, there is a risk of damage to the refrigerant tubes, which will require expensive refilling.
A simple visual inspection with a flashlight can be used for diagnosis. Run your finger along the crack: if you feel a snag or a draft, the damage is deep. It is also worth paying attention to the color of the edges of the crack - if they turn white, it means that the plastic is experiencing strong internal stress.
How to seal a crack: choosing a material
Choosing the right sealant or glue is a key stage of restoration. Regular superglue (cyanoacrylate) is not suitable for refrigerators as it becomes brittle at low temperatures and may crack within a week. You need materials that retain elasticity over a wide temperature range.
The optimal solution is silicone-based food sealants or special two-component epoxy resins. You can also use plastic soldering using solder of the same material. It is important that the substance used is (safe) and does not emit harmful substances upon contact with products.
Specialized repair kits for plastic often contain hot melt adhesive that adheres perfectly to polypropylene and ABS plastic. Before purchasing, make sure that the material is compatible with the type of plastic of your refrigerator, which is usually indicated in the technical documentation or on the label.
Can you use regular epoxy?
You can use regular construction epoxy resin, but with caution. It should be completely safe after polymerization. However, it is better to choose a specialized composition, since ordinary resin may not withstand cycles of freezing and thawing, becoming brittle.
Step-by-step instructions: sealing a crack
The restoration process begins with careful preparation of the surface. The refrigerator must be defrosted, washed and, most importantly, completely dried. Any moisture at the edges of the crack will negate any bonding efforts. Degrease the damaged area with alcohol or acetone.
☑️ Preparation for repair
If the crack is deep, it is recommended to first solder it or use reinforcing mesh. Apply the first layer of sealant, pressing it deep into the damage. Then apply the second layer, leveling it with a spatula or knife blade flush with the main wall. Allow the compound to dry according to the manufacturer's instructions.
After complete drying (usually 24 hours), you can sand the repaired area with fine-grained sandpaper. This will make the surface smooth and prevent dirt from accumulating in the future. If the color of the repaired area is very different, it can be painted over with food paint or special enamel.
⚠️ Attention: When working with chemical compounds, ensure good ventilation in the room. Vapors from solvents and sealants can be toxic if inhaled in a confined space.
Plastic soldering method for deep damage
For serious fractures, especially corner ones, soldering is the best solution. This method allows you to restore the structural integrity of the wall. You will need a soldering iron with a thin tip and strips of plastic identical to the material of the refrigerator (can be cut from an inconspicuous place inside, for example, under the drawers).
The technique involves melting the edges of the crack and soldering a reinforcing strip into them. Movements must be fast and careful so as not to burn through the wall. The heated plastic is mixed, forming a monolithic joint, which is not inferior in strength to solid material.
After cooling, the seam must be sanded. This method requires some skill, so it is recommended to practice on a scrap piece of plastic. The main advantage of soldering is durability and the absence of chemical odors after completion of the work.
Table: Comparison of repair methods
To make it easier for you to choose a method for eliminating a defect, we have prepared a comparative table of the main methods. It will help assess the labor intensity and effectiveness of each option.
| Method | Complexity | Durability | Cost | Applicability |
|---|---|---|---|---|
| Food sealant | Low | Medium | Low | Surface cracks |
| Two-component adhesive | Medium | High | Medium | Through holes |
| Plastic soldering | High | Very high | Low | Deep faults, corners |
| Wall replacement | Very high | Factory | High | Critical damage |
When you need to call a technician or replace the refrigerator
DIY Repair is not advisable in all cases. If the crack has led to a freon leak (you can hear hissing, the refrigerator does not freeze, but the compressor is humming), independent repair is impossible. You need to call a specialist to look for leaks, seal the pipes and refill with refrigerant.
It is also worth thinking about replacing the unit if the damage to the internal plastic is widespread and the plastic crumbles from age. This indicates that the material has exhausted its resource and new cracks will appear constantly. In older models, repairs may cost more than the residual value of the equipment.
If the damage is in a hard-to-reach place, for example, behind a foamed evaporator, disassembling the refrigerator may lead to damage to the thermal insulation. In such cases, it is more economically profitable to purchase a new refrigerator than to risk the integrity of the entire cooling system.
⚠️ Attention: If you are not confident in your abilities or are afraid of damaging the cooling system when soldering, it is better to contact a service center. Inept actions can lead to complete loss of the refrigerator.
Is it possible to seal a crack with ordinary tape?
Using ordinary tape is strictly not recommended. The adhesive tape will not withstand low temperatures, will lose its stickiness and fall off. In addition, the tape does not provide a seal and can create an unpleasant odor. The only exception is a temporary measure for a couple of hours before the technician arrives, but it’s not a fact that he stays in the cold.
Is a crack dangerous to health?
A crack itself is not dangerous if it does not contain bacteria. However, if moisture penetrates into the housing through it, mold may form there, the spores of which will circulate along with the air. In addition, some adhesives and sealants are toxic until completely dry, so it is important to use only food-grade certified materials.
How long does it take for sealant to dry in the refrigerator?
Most food-grade sealants take 12 to 24 hours to fully cure at room temperature. You can turn on the refrigerator and load food only after the odor has completely disappeared and the composition has hardened. It is not recommended to speed up the process with a hairdryer, as this can lead to the formation of bubbles.
What to do if the shelf and not the wall is cracked?
Repairing glass or plastic shelves is often impractical due to the load. It is better to replace a cracked shelf with a new one, ordering an original spare part for the refrigerator model. The glue on the shelves does not hold well due to the constant mechanical pressure of the products.