What the refrigerator is made of: a complete analysis of the body materials, seals and internal parts

A refrigerator is not just a household appliance, but a complex engineering solution where each material plays a key role. Durability depends on strength, energy consumption depends on quality, and tightness and absence of ice depends on composition. But few people think about what is hidden under the glossy surface or steel casing. casing durability depends on quality thermal insulation - energy consumption, and from the composition sealing rubber — tightness and absence of ice. But few people think about what is hidden under the glossy surface or steel cladding.

Today, manufacturers use dozens of materials - from classic stainless steel to innovative polymer composites with antibacterial additives. At the same time, the choice of specific raw materials is often dictated not only by technical requirements, but also by design trends, environmental standards, or even the fashion for “retro style”. For example, refrigerators Samsung Bespoke allow you to combine panels of different colors and textures, and premium class models are equipped with carbon-coated glass shelves. Liebherr premium-class are equipped with glass shelves with carbon coating.

In this article we will analyze in detail what a modern refrigerator consists of - from the outer shell to the small parts of the compressor. You will learn why some materials turn yellow over time, which ones are safe for storing food, and which ones can cause breakdowns. And most importantly, how to properly care for different types of surfaces so that the equipment lasts longer.

1. External body: metal vs plastic - which is stronger and more practical?

The body of the refrigerator is its “face” and at the same time a frame that can withstand loads from the weight of the products, vibration of the compressor and mechanical influences. Traditionally, three main materials are used for its manufacture:

• 🔹 Stainless steel —the leader among premium models (Liebherr, Miele, Smeg). It is resistant to corrosion, easy to clean and looks presentable, but requires careful care: fingerprints and stains on such a surface are more noticeable.
• 🔹 Enameled metal is a budget alternative to stainless steel. Sheet metal is coated with a layer of enamel, which protects against rust and allows you to apply any color. Minus - over time, the enamel can chip off when impacted.
• 🔹 Plastic with a metallized coating is the lightest and cheapest option. Used in economy class models (ATLANT, Indesit). Plastic does not rust, but is scratched and can fade in the sun.

Interesting fact: some brands, for example, Smegare returning to the retro design of the 50s, using enamelled steel bright colors (red, turquoise, cream). Such refrigerators are not only functional, but also become part of the interior. However, you have to pay for style - enamel requires delicate cleaning without abrasives.

And here refrigerators with all-glass doors (for example, LG InstaView) are not only a tribute to fashion, but also a practical solution: through the transparent door you can see the contents without opening, which saves energy. However, glass is heavier than plastic, so such models are equipped with reinforced hinges.

⚠️ Warning: If your metal-framed refrigerator is located near a stove or window, check for heating. Temperature changes can deform the enamel or cause condensation inside the seal.

2. Thermal insulation: why wall thickness affects the light bill

The thermal insulation layer is the “invisible hero” of the refrigerator, which determines how effectively the appliance retains cold. The better the insulation, the less often the compressor turns on and the less electricity is consumed. Modern manufacturers use two main types of insulation:

1. Polyurethane foam (PPU) —the most common material. It is light, cheap and has low thermal conductivity. However, over time, polyurethane foam can cake, losing up to 10–15% of its properties over 10 years of operation.
2. Vacuum insulation (VIP panels) is an innovative solution that is used in premium models (Beko ProSmart Inverter, Haier). The panels are sealed containers with a vacuum inside, which are 5–7 times thinner than conventional insulation with the same efficiency.

The thickness of the insulating layer varies from 3 to 6 cm. For example, in compact refrigerators (Midea or Birusa) it is minimal - about 3 cm, which affects energy consumption. And in large Side-by-Side models (Samsung RF23) it can reach 5-6 cm, providing an energy efficiency class A+++.

Important: if the refrigerator has become worse at keeping cold, and the compressor works almost non-stop, this may be a sign destruction of insulation. Most often, this happens after mechanical damage (for example, during transportation) or due to the influence of rodents that chew through the foam.

3. Sealing gum: why it turns yellow and how to restore it

The seal (or magnetic rubber) is a barrier that prevents warm air from entering the chamber. Over time, it loses elasticity, becomes moldy or turns yellow. In 90% of cases, seals are made from:

• 🧲 PVC (polyvinyl chloride) - a cheap but short-lived material. Over time, it hardens and cracks, especially when in contact with fats or chlorine-based detergents.
• 🧲 Thermoplastic elastomer (TPE) is a modern alternative to PVC. Resistant to temperature changes, does not turn yellow and does not absorb odors. Used in models Bosch Serie 6 and Electrolux.
• 🧲 Silicon rubber —the most durable and hygienic option. Does not support bacterial growth, but is expensive. Found in medical and premium refrigerators.

Why does the rubber turn yellow? The reason is oxidation of materials under the influence of ultraviolet radiation (if the refrigerator is located near the window) or reaction with food acids (for example, when juice gets in). It can be restored using:

• 🧽 Hydrogen peroxide (3%) - removes yellowness and disinfects.
• 🧽 Soda with lemon juice - natural bleach.
• 🧽 Special products (for example, TOP HOUSE for seals).

⚠️ Attention: Never use acetone or solvents to clean rubber bands - they destroy the structure of the material, and the seal will lose its tightness.

What to do if the elastic band comes away from the body?

If the seal comes off in one place, it can be temporarily fixed with double-sided tape or silicone glue. But if the gap is more than 2 mm or the elastic band is torn, it must be replaced. Service centers sell universal seals with a magnetic insert that are suitable for most models.

4. Shelves and containers: what materials are safe for food?

The internal equipment of the refrigerator is in contact with food, so strict requirements are imposed on the materials: they must be non-toxic, resistant to low temperatures and easy to clean. Let's consider the main options:

• 🍽️ Tempered glass - standard for shelves in most models. Withstands weight up to 20–30 kg, does not absorb odors and is easy to clean. In the premium segment (Liebherr, Samsung Family Hub), the glass is coated with an antibacterial layer based on silver ions.
• 🍽️ Plastic (polypropylene, ABS) —used for drawers and door shelves. High-quality plastic is marked with PP or ABS and does not emit harmful substances. Cheap analogues may turn yellow and crumble.
• 🍽️ Metal mesh - found in retro models (Smeg) or wine refrigerators. It looks beautiful, but is less practical - products can fall through, and the mesh rusts when in contact with moisture.

Particular attention should be paid containers for fruits and vegetables. In budget refrigerators, they are often made of thin plastic that breaks when frozen. In mid- and premium-class models (Bosch KIN86AF30, LG GC-B247SLUV) they use polycarbonate a durable and frost-resistant material that can withstand temperatures down to –30°C.

Important: if plastic shelves or drawers begin to crumble or emit a chemical smell, they need to be replaced. This is a sign material degradationthat can be hazardous to health.

Do not place hot dishes on glass shelves - a sudden temperature change can cause cracks.

Wash plastic boxes with warm water and a mild detergent (no abrasives).

Periodically check the fastenings of the shelves - loose fasteners can lead to a fall.

Do not use knives or forks to separate ice from the walls - this will scratch the coating.-->

5. Compressor and tubes: the heart of the refrigerator

The compressor is the “motor” of the refrigerator, which circulates the refrigerant. Its body and internal parts are made of materials resistant to high pressures and temperatures:

• ⚙️ Aluminium a lightweight metal that dissipates heat well. Used for the compressor housing and heat exchangers.
• ⚙️ Copper —ideal for tubes through which freon circulates. It does not oxidize and withstands pressure up to 30 atmospheres.
• ⚙️ Stainless steel —used in inverter compressors (Panasonic, Hitachi) to reduce vibration.

Modern refrigerators are equipped inverter compressorsthat are quieter and consume 30–40% less energy than conventional ones. Their parts are coated with special lubricants based on polyalphaolefins (PAO)that do not thicken at low temperatures.

And here refrigerant (freon) circulates through copper or aluminum tubes. Old models used R-12 or R-22, but today they have been replaced with environmentally friendly analogues - R-600a (isobutane) or R-134a. They are less toxic, but require more sealed systems.

⚠️ Attention: If the refrigerator begins to rattle loudly or the compressor turns off a few seconds after starting, this may be a sign of freon leaks or wear on the piston group. In this case, diagnostics are required at a service center.

6. Door handles and decor: design vs functionality

Handles and decorative elements of the refrigerator are often perceived as small things, but they affect convenience and durability. Manufacturers use:

• 🔘 Aluminium —light, durable, does not rust. Often found in models Samsung and LG.
• 🔘 Plastic with a metallized coating —cheap, but the coating wears off over time.
• 🔘 Wood or bamboo —an eco-friendly option for refrigerators in style "eco" or "loft". Requires special care (oiling every six months).

An interesting trend in recent years is hidden handles (as in Liebherr CBPesf 5156), which are integrated into the body. This is not only stylish, but also practical: there are no protruding parts that can accidentally get caught. However, such mechanisms are more difficult to repair.

But decorative panels (for example, in Smeg FAB28) are often made of enameled steel with a pattern. They are beautiful, but require careful handling - scratches on such a surface cannot be eliminated.

7. Environmental friendliness of materials: what is safe for the home?

Modern manufacturers pay great attention to environmental friendliness. Here are the materials that are considered safe:

• ♻️ Freon-free polyurethane foam —new models use insulation that does not emit harmful gases.
• ♻️ Antibacterial plastic —contains silver or zinc-based additives that inhibit the growth of bacteria.
• ♻️ Recycled steel —some brands (Electrolux, Whirlpool) use scrap metal to make cases.

However, not all “eco” labels are honest. For example, the inscription "Green" on plastic does not always mean that it is recyclable. Before purchasing, check the certificates - for example, Energy Star (energy efficiency) or RoHS (absence of harmful substances).

Important: if the refrigerator smells of plastic or chemicals in the first days after purchase, this is normal. It is enough to ventilate the chambers for 24 hours. But if the smell does not disappear after a week, this is a reason to return the equipment under warranty.

FAQ: Frequently asked questions about refrigerator materials

1. Why is the refrigerator body electrocuted?

This happens due to grounding failure or damage to the wire insulation. If the refrigerator is new, check the outlet. If it’s old, the wires inside the case may be exposed. In both cases, diagnostics by an electrician is needed.

2. Is it possible to paint a refrigerator?

Yes, but only with special paints for metal or plastic (for example, Rust-Oleum). Before painting, the surface must be degreased and primed. Do not use ordinary enamels - they will crack from temperature changes.

3. Why do plastic shelves become fragile?

This happens due to photoaging the destruction of polymers under the influence of light and oxygen. To slow down the process, avoid direct sunlight and wash shelves with mild, chlorine-free products.

4. Which body material is the most durable?

Stainless steel lasts the longest (20+ years), but requires maintenance. Enameled metal is cheaper, but is sensitive to shock. Plastic is the most short-lived - it can crack after 5–7 years.

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

Theoretically, yes, but only with an original part from the manufacturer. Homemade inserts may not withstand the load or disrupt the air circulation in the chamber.