The question of how much copper is contained in an old refrigerator compressor often arises among those who collect or distribute non-ferrous scrap. Many people mistakenly believe that the weight of the precious metal inside the unit is much higher than it actually is. In practice, the bulk of the device is made up of steel and cast iron, and the copper winding makes up only a small, albeit valuable, proportion of the total weight.
Before you begin disassembling, you need to understand the design of the unit. The sealed housing hides the electric motor and piston group, where non-ferrous metals are concentrated. Extraction efficiency directly depends on the model of the compressor and the year of its manufacture, since winding technologies and materials have changed over the decades.
In this article we will analyze in detail what to expect when opening the housing, what tools are needed and why the game is not always worth the candle. You will also learn how to determine the metal yield as accurately as possible without completely destroying the unit.
Real copper yield: myths and reality
There is a common misconception that there are several kilograms of pure copper inside an old Soviet or foreign compressor. In reality, the situation looks different. Copper output usually ranges from 8% to 12% of the total mass of the device, and then only under the condition of perfect cutting. The rest is heavy steel, oil and refrigerant.
Most of the volume is taken up steel case, which is necessary to seal the freon and create a durable container for moving parts. Inside there is an electric motor, the windings of which are made of copper wire, and copper heat exchanger tubes, if they have not been replaced with aluminum in newer models.
⚠️ Attention: The weight of the compressor on the scale and the weight of the useful metal are different things. When scrapping a leaky unit, the weight of the residual oil may be deducted from you, so weighing is best done after draining the technical fluids.
It is worth considering that modern compressors often have a smaller safety margin and a lower content of non-ferrous metals compared to their Soviet counterparts. Inverter models may contain rare earth magnets, but the amount of copper in them is also the same optimized by manufacturers to reduce costs.
Factors influencing the amount of non-ferrous metal
The amount of copper in the unit is not a constant and depends on a number of technical parameters. First of all, this motor power. More powerful models designed for large refrigerators or freezers require thicker wire and more turns to create the necessary magnetic field.
The second important factor is the era of production. Older models from the 70s and 80s were often made with greater reliability and used more copper, as raw material costs were lower and energy efficiency requirements were different. New energy efficient compressors designed to use a minimum of materials with maximum output.
The type of refrigerant and evaporator design also matter. If the system uses large diameter copper tubes for connections, they can be removed separately, which will slightly increase the overall yield of non-ferrous metal. However, in sealed systems, the main mass is the stator winding.
Safe disassembly technology compressor
The process of copper extraction requires serious preparation and compliance with safety precautions. The compressor housing is under pressure, even if it is old, and there may be residual gas or oil vapor inside. The first step should always be decompression. To do this, you need to carefully file the tubes or drill a hole in the housing, making sure that sparks do not fall on possible oil vapors.
To open the housing you will need a powerful tool. A grinder with a metal disc is the most effective option. It is necessary to make a circular cut along the weld connecting the upper and lower parts of the body. After this, the cover can be removed to gain access to the insides.
Next, the motor core should be removed. It is mounted on springs or rubber shock absorbers, which also need to be cut or disconnected. The copper winding is located on the stator. To remove it, you often have to saw through the copper frontal parts of the coils on one side and knock out the wire on the other.
☑️ Tools for disassembly
⚠️ Attention: When working with an angle grinder, be sure to use safety glasses and a respirator. Steel shavings and dust from burnt wire insulation can seriously damage your eyes and respiratory tract. Work in a well-ventilated area.
Some craftsmen prefer not to open the housing completely, but to drill the bottom and knock out the insides, but this is less effective for preserving the integrity of the winding. Cleaning copper Insulation and varnish can be removed by firing, but this method contaminates the metal and reduces its grade upon delivery, so it is better to remove the insulation mechanically.
Comparative table: Weight and yield of copper in different models
Different manufacturers use different winding technologies and materials. Below is a table showing the approximate ratio of the weight of the unit itself and the amount of copper recovered. Data are averaged and may vary depending on the specific year of manufacture and condition of the device.
| Model / Manufacturer | Total weight (kg) | Approximate weight of copper (kg) | Percentage of yield (%) |
|---|---|---|---|
| Atlant (Belarus) | 9.5 - 10.5 | 1.0 - 1.2 | ~10-11% |
| Don (USSR/Russia) | 10.0 - 11.0 | 1.1 - 1.3 | ~11-12% |
| LG / Samsung (Korea) | 8.5 - 9.5 | 0.8 - 1.0 | ~9-10% |
| Whirlpool / Electrolux | 9.0 - 10.0 | 0.9 - 1.1 | ~10% |
| Low-power (bar) | 5.0 - 6.0 | 0.4 - 0.5 | ~8-9% |
As can be seen from the table, Soviet models often turned out to be more “copper” in percentage terms than their modern ones analogues. This is due to less stringent requirements for weight and dimensions in the past. Modern compact compressors gain in size, but lose in the amount of useful scrap.
Why can the weight of copper vary?
Weight can vary due to the use of aluminum windings in cheap models (it is non-magnetic and lighter) or the presence of additional copper heat exchangers in some designs. Always check the cut wire - copper has a reddish tint, aluminum is silvery.
Economic feasibility and alternatives
Is it worth disassembling at all? If you have one or two compressors, the game is hardly worth the candle. The energy costs for operating an angle grinder, the time spent on hard physical work, and the health risks often outweigh the revenue from selling a kilogram or two of copper at the price of scrap.
However, if you do this professionally and have access to dozens of pieces of equipment, the process becomes profitable. In this case, it is important to establish distribution channels and have efficient processing equipment. Wholesale always valued higher than retail delivery in small quantities.
An alternative to disassembling for copper can be the restoration of the compressor for recycling. Old, but serviceable units are valued by refrigerator repair technicians, especially if they are rare or powerful models. They are also used to make homemade compressors for airbrushing, inflating tires or pneumatic tools.
Rules for the delivery and storage of non-ferrous scrap
If you decide to hand over the mined copper, it is important to prepare it correctly. The metal must be dry, clean and free of foreign inclusions (insulation, solder, steel). Scrap grade directly affects the price: “Shine” (cleaned wire) costs more than “Mix” (a mixture with brass or insulation).
It is better to store copper in a dry place, since oxidation, although slow, reduces the cost. Scrap should be handed over to specialized collection points that have licenses to work with non-ferrous metals. This guarantees fair weighing and no problems with the law.
When delivering large volumes, documents confirming the origin of the metal may be required. This is a measure to combat theft, so having receipts or write-off certificates for equipment will be a plus. Reception points often have their own laboratories for express analysis of the alloy composition.
⚠️ Attention: Prices for non-ferrous metals are volatile and change daily. Before traveling to the collection point, be sure to check the current rate on their official website or by phone to avoid unpleasant surprises during the calculation.
Frequently asked questions (FAQ)
Is it possible to determine the amount of copper without disassembling?
It is impossible to determine accurately, but you can weigh the compressor and take it away approximate weight of steel (about 85-90% by weight). A more accurate method is to weigh the magnet: if the magnet sticks strongly, then there is a lot of ferromagnetic steel, if weakly, perhaps more copper or aluminum, but these are very rough estimates.
Is there aluminum in the compressor?
In modern cheap models, the motor winding can be made of aluminum, varnished to match the color of copper. Some internal pipes may also be aluminum. You can check this by scratching the wire: the aluminum inside will be silver.
Is it dangerous to open a compressor that is 20 years old?
Yes, there may be oil inside, mixed with refrigerant breakdown products, and residual pressure. It is also possible for an explosive mixture to form when air and sparks enter. It must be opened only in compliance with all fire safety measures and in a ventilated place.
How much does 1 kg of copper in scrap cost?
The price depends on the region, exchange rate and the specific collection point. It is usually linked to LME stock quotes. At the time of writing, the price varies, so you need to find out the current figure directly at the delivery point.