The question of the content of non-ferrous metals in household appliances often arises not only from academic interest, but also for a practical purpose - recycling old equipment. Many owners, planning to replace refrigeration unit, wonder whether there is copper in the refrigerator and what its approximate mass is. The answer to this question is ambiguous, since the composition of the equipment has changed over the decades, and what was the norm in Soviet times is considered a rarity today.
The main difficulty is that modern manufacturers are actively introducing alternative materials to reduce production costs. If earlier non-ferrous metals formed the basis of heat exchange systems, now their share is minimized. However, the presence of this valuable resource cannot be completely excluded, although its quantity and localization strongly depend on the year of manufacture and the specific model of the device.
In this material we will analyze in detail the design of refrigeration units of different eras. You will learn where metal is hidden, how to distinguish aluminum from copper visually and chemically, and also get a realistic estimate of the weight of scrap that can be obtained during disassembly. This knowledge will help you correctly plan the recycling process or understand the value of broken equipment.
Design features of heat exchangers
The main place where copper has traditionally been used is the refrigerant circulation system. This is where materials with high thermal conductivity and corrosion resistance are required. In the classic scheme refrigeration cycle implies the presence of a condenser (radiator at the back or on the sides) and an evaporator (inside the chamber). Historically, the tubes of these units were made of red metal, but over time, engineers found ways to reduce the cost of the design.
In older models produced before the mid-90s, copper tubes could be found everywhere. They connected the compressor, filter drier and the heat exchangers themselves. However, in modern domestic refrigerators the situation has changed dramatically. Manufacturers have switched to using aluminum and steel, which are cheaper to mine and process, although they are inferior in some physical properties.
⚠️ Attention: Visually distinguishing tinned copper from aluminum can be extremely difficult. Aluminum tubing is often coated with a layer of tin or varnish to keep it shiny and resist oxidation, imitating the appearance of more expensive metal.
The key is to understand that even if the tubing is made of aluminum, the connecting pieces or internal components of the compressor may contain copper. Therefore, we cannot talk about the complete absence of metal; we are talking only about its concentration and availability for extraction. Disassembling a modern unit in order to obtain a couple of hundred grams of metal is often not economically feasible without professional equipment.
Where exactly is copper located in the unit
If you decide to carry out diagnostics or disassembly, it is important to understand the exact localization of non-ferrous metals. In most cases, they are concentrated in three main components: the compressor, the condenser and the connecting lines. However, each of these units has its own nuances, depending on the production technology of a particular brand.
In compressor (motor), copper is used in the windings of the electric motor. This is an almost unchanged structural element, since aluminum conducts current less well and requires a larger wire cross-section, which increases the dimensions of the motor. Inside the sealed casing there is a motor, the windings of which are made of pure non-ferrous metal. Copper may also be present in valve groups and pipes coming out of the motor housing.
- 🔴 The stator windings of the electric motor are pure electrolytic copper.
- 🔴 Compressor output tubes are often copper, but can be steel.
- 🔴 The internal channels of the heat exchanger are almost always copper in older models.
- 🔴 Connecting fittings are brass alloys with a high copper content.
The condenser located on the rear wall in modern models is most often made of steel with an anti-corrosion coating or aluminum. Previously, it was a black grille made of steel tubes, but now aluminum sheets with channels sealed inside are often found. Copper can only be found here in soldering areas or in transition elements, unless they are replaced with steel.
The evaporator inside the freezer or refrigerator is another unit that has undergone changes. In systems No Frost the evaporator is hidden behind a plastic panel and is an aluminum radiator with a welded coil. In drip systems (“crying evaporator”), the tubes can be aluminum or steel, and copper is extremely rare, except in the form of solder.
Why did they stop using copper in tubes?
The main reason is cost and theft. Copper tubes are easy to cut and the scrap price is high. In addition, modern aluminum soldering technologies make it possible to create reliable connections comparable in durability to copper ones, but at a significantly lower cost of material.
Differences between old and new models
The evolution of refrigeration technology directly affects the amount of non-ferrous metal in waste. If you are the owner of a rare Soviet refrigerator, for example, models ZiL, Biryusa or Saratov pre-1990, your chances of finding copper are much higher. In that era, they did not save on materials, and heat exchanger tubes were often made of copper, and massive windings were used in compressors.
In models of the 90s and early 2000s years the transition period begins. Here you can already find hybrid solutions: the compressor can be equipped with steel tubes, and the condenser can be equipped with aluminum. However, in expensive models of that time, especially imported ones (Liebherr, Bosch), copper was still found in critical components to ensure reliability.
Modern units produced after 2010 are practically devoid of exposed copper elements in the external circuits. Engineers have switched to using composite materials and alloys. Even if the description states "high heat transfer efficiency", this is achieved due to the design of the fins and the shape of the channels, and not due to the material of the tubes.
| Release period | Condenser tube material | Evaporator material | Probability of availability copper |
|---|---|---|---|
| Before 1990 | Copper / Steel | Aluminum / Steel | High (in the compressor and lines) |
| 1990-2005 | Steel / Aluminum | Aluminum | Medium (only in motor windings) |
| 2005-2015 | Steel | Aluminum | Low (only in windings) |
| After 2015 | Steel / Aluminum | Aluminium | Minimum (only in windings) |
Thus, when evaluating scrap, it is important to take into account the age of the equipment. An old Soviet unit can produce more non-ferrous metal than three modern Chinese refrigerators combined. However, the weight of the old unit is much greater due to the use of thick metal in the housing and heavy compressors.
Weight of copper in the compressor and other components
The richest source of non-ferrous metal in any refrigerator, regardless of the year of manufacture, is electric motor the compressor. This is where the bulk of the copper available for extraction is concentrated. The weight of the windings depends on the power of the motor, which, in turn, depends on the volume of the refrigeration chamber and the energy efficiency class.
On average, a standard household compressor contains from 100 to 250 grams of copper wire. In powerful two-compressor models or large-volume units, this number can reach 300-350 grams. However, it is worth remembering that extracting this copper requires complete disassembly of the sealed casing, which is a labor-intensive and dangerous process without special tools.
If we consider tubes and radiators, then in older models the weight of copper elements could reach 1-1.5 kg. In modern devices, the weight of copper in tubes tends to zero, as they are replaced by steel and aluminum. Therefore, answering the question “how much copper is in the refrigerator,” we can say with confidence: in the new device - only in the motor, in the old one - also in the circuit.
- ⚖️ Small compressor (single-chamber): ~80-120 g of copper in the windings.
- ⚖️ Medium compressor (standard two-chamber): ~150-220 g of copper.
- ⚖️ Powerful compressor (Side-by-Side, No Frost): ~250-350 g of copper.
- ⚖️ Tubes (older models only): additionally up to 1000 g.
Important It should be noted that when scrapped, compressors are often accepted as an “electric motor” or “micromotor”, the price of which is lower than that of pure copper wire (mika). To get the maximum benefit, it is necessary to remove iron and insulation, which is difficult to do at home.
⚠️ Attention: Refrigerant vapor and compressor oil may remain in the compressor under high pressure. Opening the housing with a grinder or hacksaw can lead to ignition of oil vapors or splashing of aggressive substances. Follow safety precautions!
How to distinguish copper from aluminum and steel
For those involved in recycling, it is critically important to be able to identify the material. An error in determination can lead to financial losses, since metal collection points strictly sort scrap. There are several proven methods that allow you to accurately determine the composition of tubes without laboratory equipment.
The first and simplest method is visual and tactile. Copper has a characteristic reddish-yellow hue that does not fade when chipped. Aluminum is always silvery white, even if varnished. Steel, in turn, is gray in color and is usually magnetic. However, it is worth remembering that copper is diamagnetic and a magnet will not stick to it, which is an excellent test.
The second method is testing for fracture or a file. If you make a small cut on the tube, the color of the chip or cut will be indicative. Copper shavings will be soft and red, aluminum shavings will be white and easily crumble. You can also use weight: copper is significantly heavier than aluminum. Compare two pieces of tube of the same size in your hands - the copper one will be noticeably heavier.
Method of testing with a magnet:1. Take a powerful neodymium magnet.
2. Bring it to the cleaned area of the tube.
3. If the magnet sticks strongly, it is steel (ferromagnetic).
4. If it doesn’t stick at all, it’s copper or aluminum (dia/paramagnetic).
5. To distinguish between copper and aluminum, compare the weight or color on the cut.
The chemical method is also effective, but requires caution. When exposed to nitric acid, copper dissolves to form a green solution (copper nitrate) and release of brown gas. Aluminum reacts differently, while steel simply rusts or becomes passivated. However, at home, the use of aggressive chemicals is not recommended.
☑️ Checking the metal before delivery
Economic feasibility of disassembly
Is the game worth the candle? This question arises for everyone who plans to disassemble the refrigerator for the sake of metal. Let's do the math. Even if you have an old refrigerator with copper tubes, the total yield of non-ferrous metal rarely exceeds 1.5-2 kg. Considering current prices for scrap, the proceeds could amount to several hundred rubles.
On the other hand, modern refrigerators contain mainly aluminum and steel. Aluminum is valued significantly lower than copper, and its extraction from composite radiators (where the metal is pressed with other materials) requires industrial equipment. Disassembling such a radiator by hand will take hours, and you will end up with dirty, low-quality scrap.
The most valuable item for resale is often the compressor assembly itself, if it is working, or its internal components for repair. But if the goal is scrap, then it is more profitable to hand over the entire refrigerator to specialized recycling points, where they can pay a fixed amount for it or even accept it for free, saving you time and effort.
In addition, we must not forget about the environmental aspect. Refrigerators contain refrigerants that, when released into the atmosphere, destroy the ozone layer. Professional disposal involves the safe selection of freon, which cannot be done with handicraft dismantling with an angle grinder. Therefore, if you do not have experience and equipment, it is better to entrust this process to professionals.
⚠️ Attention: Prices for non-ferrous scrap fluctuate (change) daily. Before going to the collection point, be sure to check the current prices for “micro” (micromotors) and copper wire, since reception conditions may vary in different cities.
Questions and answers (FAQ)
Is it possible to determine the presence of copper by the sound when tapping?
This is an unreliable (unreliable) method. The sound depends on the thickness of the tube wall and the presence of liquid inside. Copper rings softer than steel, but it is almost impossible to distinguish it from thick aluminum by ear without experience. It is better to use a magnet and visual inspection of the cut.
How much does copper weigh in a compressor from an Atlant refrigerator?
In brand compressors Atlant, which are produced in Belarus and widely distributed in the CIS, the copper content in the windings averages 150-180 grams This is a standard indicator for motors with a power of about 1/5 - 1/4 hp.
Does it make sense to disassemble the radiator (condenser) of a modern refrigerator?
Most likely not. In 95% of cases, modern radiators are made of aluminum or steel. Even if there is copper there, it is in the form of a thin layer or solder, which cannot be extracted in its pure form at home. You will only waste time cutting metal.
Why are the tubes black in old refrigerators and silver in new ones?
The black color of old tubes is due to the use of steel painted with a special heat-resistant paint to protect against corrosion. The silver color of the new tubes indicates the use of aluminum or stainless steel, which do not require additional painting and are naturally protected by an oxide film.
What to do if the magnet sticks weakly to the tube?
Weak adhesion (paramagnetism) can be observed with some aluminum or stainless steel alloys. If the magnet sticks, even slightly, it is definitely not pure copper. Copper is diamagnetic and will slightly repel a magnet (although this is difficult to notice by eye), but certainly not be attracted.