What is used in the refrigerator: from refrigerants to seals

A refrigerator is not just a “box for food”, but a complex engineering device, where each element performs a strictly defined function. Not only the cooling efficiency, but also the service life of the equipment, noise level, and sometimes even the safety of the products depends on the choice of materials. For example, why is it almost never found in modern models? And why are manufacturers switching to magnetic seals instead of rubber ones? Freon R-12, and instead use R-600a or R-134a? And why are manufacturers switching to magnetic seals instead of rubber ones?

In this article we will analyze in detail all the substances and materials that are used in refrigerators today - from refrigerants and compressor oils to thermal insulation and antibacterial coatings. You will learn which components are responsible for the cold, which protect against corrosion, and which simply make operation more convenient. And also why some materials that seemed reliable 20 years ago are now considered obsolete or even dangerous.

Refrigerants: the heart of the refrigeration system

Without refrigerant, a refrigerator turns into an ordinary cabinet. This substance circulates in a closed circuit, absorbing heat inside the chamber and releasing it outside through the condenser. The noise level of the compressor and even the environmental friendliness of the equipment depend on the type of refrigerant. cooling efficiency, compressor noise level and even environmental friendliness of the equipment.

Even in Soviet refrigerators ("ZIL», «Biryusa», «Minsk") (dichlorodifluoromethane) was used. It was cheap and reliable, but it destroyed the ozone layer. Since the 2010s, it has been completely banned in new models, replaced with safer analogues: Freon R-12 (dichlorodifluoromethane). It was cheap and reliable, but it destroyed the ozone layer. Since the 2010s, it has been completely banned in new models, replaced with safer analogues:

• 🔹 R-134a —the first “ozone-depleting” refrigerant, but with a high global warming potential (GWP). Used in budget models (Indesit, Atlant).
• 🔹 R-600a (isobutane) - natural gas, environmentally friendly and energy efficient. Used in premium refrigerators (Liebherr, Samsung with technology Digital Inverter).
• 🔹 R-290 (propane) - another natural refrigerant, but explosive if leaked. Rarely found in household refrigerators.
• 🔹 R-410A —a mixture for systems with high pressure (for example, in some models Bosch i LG).

Important: if your refrigerator uses R-600a, it cannot be refilled R-134a - this will lead to compressor failure. The type of refrigerant is always indicated on nameplate (metal plate) behind or inside the chamber.

⚠️ Attention: If there is a leak of refrigerant R-600a (isobutane), an explosive concentration of gas may accumulate in the room. there is a faint smell of gas in the room - immediately turn off the equipment and ventilate the room. Do not turn on electrical appliances until the leak is eliminated.

Compressor oils: why not universal

The oil in the compressor performs three key functions: lubricates moving parts, removes heat and seals gaps. But not every oil is suitable for a specific refrigerant. For example, mineral oils is compatible only with R-12 and for R-22, and for R-134a and R-600a require synthetic (polyester) analogues.

Here are the main types of oils and their features:

If, during repairs, technicians suggest adding “universal” oil, this is a reason to be wary. Incompatibility of oil and refrigerant leads to compressor jammingdeposits. capillary tube and reducing the service life of the equipment by 30–50%.

Thermal insulation: why wall thickness is more important than it seems

The quality of thermal insulation directly affects the energy consumption refrigerator. The better the material retains the cold, the less often the compressor turns on. In modern models, three types of insulation are used:

• 🧊 Polyurethane foam (PPU) - the most common option. It is poured between the walls under pressure, filling all voids. Thermal conductivity coefficient: 0.02–0.028. W/m·K.
• 🧊 Vacuum insulation (VIP) —used in premium models (Liebherr, Miele). Thin panels with a vacuum inside reduce the wall thickness with the same efficiency.
• 🧊 Extruded polystyrene foam (XPS) —a cheap, but less effective option. Found in budget refrigerators (Atlant, Stinol).

Insulation thickness in different models varies from 30 mm (compact refrigerators) to 80 mm (chest freezers). For example, in refrigerators Samsung with technology SpaceMax use thinner walls (45 mm), but compensate for this with vacuum panels.

Interesting fact: in refrigerators No Frost the insulation must be thicker than in drip models, because the forced air circulation system itself increases heat loss.

⚠️ Attention: If the insulation is damaged during transportation of the refrigerator (for example, dents appear on the walls), this can lead to formation of condensation inside the chamber and increased energy consumption. Before purchasing, inspect the case for deformations.

Door seals: why magnetic ones are better than rubber ones

The sealing rubber (or, as the masters call it, the “cuff”) is responsible for the tightness of the chamber. If it is worn out, the refrigerator begins to “suck in” warm air, which is why the compressor works without stopping. In older models, they were used rubber sealswhich over time lost their elasticity and became covered with cracks.

Now manufacturers are switching to magnetic seals with a multi-layer structure:

• 🧲 Outer layer - PVC or thermoplastic elastomer (TPE), resistant to temperature changes.
• 🧲 Inside there is a magnetic insert that ensures a tight seal fit.
• 🧲 Additional layer - polyurethane foam for shock absorption.

Advantages of magnetic seals:

1. Service life - up to 10–15 years (versus 5–7 years for rubber ones).
2. Easy to clean, do not absorb odors.
3. Self-healing after deformation (for example, if the door has been open for a long time).

How to check the tightness of the seal? Take a piece of paper, close the door, holding it between the body and the rubber band. If the sheet is pulled out without effort, it’s time to change the seal.

Continuous formation of ice on the back wall

The door closes with a bang or does not lock

Cracks or deformations are visible on the rubber band

The refrigerator operates without stops-->

Antibacterial coatings: marketing or necessity?

Manufacturers often advertise antibacterial coatings on the walls of the chamber, promising protection against mold and unpleasant odors. But how effective is it? Let's look at the types of coatings:

• 🦠 Silver ions - built into the plastic walls (uses Panasonic, Hitachi). They effectively suppress up to 99.9% bacteria, but over time the properties weaken.
• 🦠 Titanium dioxide nanoparticles are activated under the influence of light (technology BioShield in refrigerators LG). They only work when the door is open.
• 🦠 Triclosan are an antibacterial additive to plastic. Banned in the EU due to the risk of bacterial resistance, but still found in cheap models.
• 🦠 Carbon filters - are installed in the air circulation system (for example, in Samsung s Twin Cooling Plus). Requires replacement every 6-12 months.

Studies show that antibacterial coatings reduce bacteria by 30-70%, but do not replace regular cleaning. For example, in refrigerators with silver ions (Panasonic NR-BN30) after 3 years of operation, the efficiency drops to 20% due to oxidation of particles.

If you choose a refrigerator with antibacterial protection, pay attention to:

1. The validity period of the coating (check in the passport).
2. The need to replace filters (if any).
3. Safety certificates (for example, NSF/ANSI 51 for food surfaces).

How to extend the effect of the antibacterial coating?

Regularly wash the chamber walls with a vinegar solution (1:1 with water) - this removes organic deposits that “clog” silver ions.

Do not use abrasive detergents - they damage the top layer of coating.

Once a month, wipe the walls with a damp cloth with baking soda (1 tablespoon per liter of water).

Electronic components: what is hidden behind the control panel

Modern refrigerators are equipped microcontrollerssensors and even Wi-Fi modules. Here are the main electronic components that you will not see from the outside:

• 📱 Control board —the “brain” of the refrigerator. Budget models (Indesit, Beko) use a simple controller with 8-bit processor, and premium ones (Samsung Family Hub) — 32-bit with AI support.
• 📱 Temperature sensors - thermistors or thermocouples. In systems No Frost there can be up to 5 pieces (in the freezer, refrigerator, on the evaporator, etc.).
• 📱 Inverter module —converts direct current to alternating current for the compressor. In refrigerators LG s Linear Compressor is used IGBT transistors for smooth speed control.
• 📱 Display and touch buttons —models with TFT screens (for example, Samsung RF23) use a capacitive panel that breaks when exposed to moisture.

The most common breakdown of electronic components is board burnout. control due to power surges. To avoid this, use voltage stabilizer (especially if your network has frequent surges).

⚠️ Attention: If the refrigerator stops responding to the buttons, but the light inside is on, the problem is most likely in touchpad. Do not try to disassemble it yourself: in 80% of cases this leads to damage to the cables. Contact a service center. data-i="226">touch panel

Additional materials: from shelves to shock absorbers

In addition to the main components, the refrigerator uses dozens of auxiliary materials. Here are the most important of them:

Please note. on shelf material: in refrigerators Bosch and Siemens glass is often used, which repels dirt. And in models EasyClean coatingwhich repels dirt. And in models LG series Door-in-Door door compartments are made. made of impact-resistant plastic with anti-slip coating.

What cannot be used in the refrigerator (and why)

Some substances and materials are categorically unsuitable for refrigerators - they can spoil food, damage equipment, or even cause a fire. Here are the main “taboo”:

• 🔥 Acetone, gasoline, solvents - destroy plastic and rubber seals. Even vapors can lead to cracking of shelves.
• 🔥 Aluminum foil on the walls - blocks air circulation in systems No Frost, causing the compressor to overheat.
• 🔥 Plastic containers without marking - cheap plastic (for example, PVC or polystyrene) releases toxins at low temperatures.
• 🔥 Heating devices —even “warm” dishes in a pan can deform plastic shelves. In refrigerators Samsung with the function CoolSelect Zone there is a separate compartment for this.
• 🔥 Alcohol-based flavors basis - alcohol evaporates and can damage electronic sensors.

It is also not recommended to store in the refrigerator:

1. Onions and garlic - they absorb moisture and begin to sprout, clogging the drainage hole.
2. Bread - in an airtight package it will mold faster than at room temperature.
3. Bananas, pineapples, melons - these fruits spoil in the cold due to the destruction of fiber.

What. what will happen if you use the wrong refrigerant in the refrigerator?

If you fill a refrigerator designed for R-600awith refrigerant R-134a, the following will happen:

1. The compressor will operate at maximum load, since R-134a has a higher condensation pressure.
2. The oil in the compressor will lose its lubricating properties, which will lead to piston jamming.
3. The temperature in the chamber will not drop below +5°Ceven if the compressor operates without stops.
4. After 3-6 months, the compressor winding will burn out, and it will need to be replaced (the cost is up to 70% of the price of a new refrigerator).

The only way to correct the situation is to completely flushing the system and replace the oil with refrigerant with original ones.

Is it possible to change the seal on the refrigerator yourself?

Yes, you can replace the seal yourself, but there are nuances:

• For models Atlant and Stinol universal rubber bands with a magnetic insert are suitable (for example, 580×520 mm for two-chamber refrigerators).
• In refrigerators Samsung i LG seals are attached to double-sided tape + screws - when replacing, you need to carefully remove the old rubber without damaging the plastic of the door.
• After installing the new seal, check the tightness with a sheet of paper (as described above). If the sheet is pulled out with force, everything is done correctly.

The average cost of a seal is from 1,500 to 4,000 rubles depending on the model. The service center will charge you more for a replacement 1,000–2,500 rubles.

Which refrigerant is the most environmentally friendly?

According to data European Environment Agency (EEA), the most environmentally friendly refrigerants for today:

1. R-600a (isobutane) - natural gas with GWP (global warming potential) = 3.
2. R-290 (propane) - GWP = 3, but explosive.
3. R-744 (carbon dioxide, CO₂) - used in industrial refrigerators, GWP = 1.

Hairing agents R-134a (GWP = 1,430) and R-404A (GWP = 3 922) are considered obsolete and are gradually being phased out in the EU. There are no restrictions in Russia yet, but manufacturers are already switching to alternatives.

Why does ice build up in a refrigerator with No Frost?

If ice appears in the system No Frost the reasons may be as follows:

• Clogged drainage hole in the freezer (cleaned with wire or washed with warm water).
• Broken heater defrost (heating element) - replacement required (part cost - 1,500–3,000 rubles).
• Failure defrost sensor or the timer (in refrigerators Indesit i Ariston this is a common problem).
• Damaged evaporator insulation —in this case, ice builds up unevenly, only in one corner.

You can clean the drainage and defrost it yourself refrigerator for 24 hours. If ice appears again, you need diagnostics in the service.

How often do you need to change the antibacterial filter?

The service life of the filters depends on the model:

• In refrigerators Samsung s Deo Fresh — once every 6 months.
• B LG s Fresh Air Filter — once every 12 months.
• B Panasonic s Ag Clean — once every 2 years (but requires monthly washing).

Signs that it is time to change the filter:

1. A persistent odor has appeared that cannot be removed by cleaning.
2. Mucus forms on the walls of the chamber.
3. Products deteriorate faster than usual.

The cost of original filters is from 800 to 2 500 rubles. You can use universal carbon filters (for example, Unifilter), but their efficiency is 20-30% lower.