Weight of copper in a compressor from a refrigerator: accurate data and disassembly

The question of how much copper is inside a compressor from a household refrigerator often arises among those who plan to scrap equipment or is engaged in professional processing of non-ferrous metals. Sealed electric motor, which is the heart of the unit, really contains a significant amount of valuable material, but extracting it is not as easy as it might seem at first glance. The weight and percentage of copper directly depend on the power of the motor, the year of manufacture and the specific model of the device.

The average household compressor weighs from 8 to 12 kilograms, but the net yield of copper after cutting is much less - usually in the range of 1–1.5 kg. It is important to understand that a significant part of the mass consists of steel and cast iron, which make up the housing and mechanical part, and not the motor windings. To accurately determine the value of scrap, it is necessary to take into account design features, since in modern models manufacturers often save on materials by replacing copper with aluminum or reducing the cross-section of windings.

The efficiency of metal extraction depends on the correct approach to dismantling and understanding the internal structure unit. Efficiency The processing process is directly related to the tool used and the knowledge of where exactly the non-ferrous metal is located. In this article, we will analyze the weight characteristics in detail, provide real data on the models and explain why the numbers may differ.

Compressor design and copper location

To understand where the copper comes from, you need to look inside the sealed casing. The main source of non-ferrous metal is stator the electric motor located in the lower part of the housing. It is on its core that coils are wound, creating a magnetic field to rotate the rotor. In classic models produced before the 2000s, predominantly pure electrical copper with high conductivity was used for windings.

However, the design is not limited only to the windings. Copper tubes are present in the discharge and suction system, although their weight in terms of the entire unit is small - only a few hundred grams. When assessing scrap, the main attention is always focused on winding wire, which is hidden under layers of varnish and tightly packed in the stator grooves. It is impossible to get to it without compromising the integrity of the casing.

⚠️ Attention: Opening the sealed compressor housing with an angle grinder or saw is strictly prohibited without first pumping out the refrigerant and oil. There may be residual pressure inside, and freon vapors, when in contact with an open flame or spark, form toxic phosgene.

Modern inverter compressors may have an engine design different from the classics, where copper is replaced with aluminum to reduce cost. This significantly affects the final weight of non-ferrous scrap. If you are planning to disassemble for the sake of metal, keep in mind that in new models the copper yield may be minimal or zero if the technology was used Copper-Aluminum (CCA).

The average weight of copper in different models

The amount of copper varies greatly depending on the manufacturer and the power of the device. Old Soviet units, such as FK-1,4 or MX-10, were famous for their “internal content” and heavy copper wire. The content of non-ferrous metal in them could reach 1.5–2 kg per unit. This is explained by the high standards of the time, when saving resources was not a priority.

Foreign models, popular in the 90s and 00s (for example, Secop, Electrolux, Whirlpool), were also often equipped with full-fledged copper windings. However, with the introduction of new environmental standards and rising prices for raw materials, manufacturers began to optimize the design. In modern Chinese and European assemblies, the weight of copper in the compressor is often reduced to 0.8–1.0 kg by reducing the diameter of the wire and using thinner core plates.

Below is a table showing the approximate copper content in popular types of compressors. The data are averaged, since the exact weight depends on the specific modification and year of manufacture.

As can be seen from the table, metal yield in percentage terms it rarely exceeds 12-15%. Most of the weight is ferrous metals. When delivering a large volume of equipment (in batches of 100 pieces), even a difference of 200 grams per unit gives a significant profit, so sorting by model can be justified.

Factors influencing the amount of metal

Why is there more copper in one compressor and less in another? The first and main factor is engine power. Compressors designed for large two-chamber refrigerators or chest freezers have a more powerful motor and, accordingly, more massive windings. Small compressors for single-chamber “babies” contain a minimal amount of metal.

The second factor is winding technology. Older models used wire with thick insulation and a large margin of safety. Modern technologies allow the use of thinner varnish coatings and dense laying of turns, which reduces weight without loss of efficiency, but also reduces the amount of copper recovered. The core material also plays a role: the use of high-quality electrical steel makes it possible to reduce the dimensions of the package, and therefore the length of the turns.

The third factor is the country of origin and brand. European standards have long required high maintainability and durability, which meant the use of high-quality copper. Asian manufacturers, focused on the mass market and low cost, often introduce compromise solutions where copper is partially or completely replaced aluminum or with alloys with a low content of non-ferrous metal.

Copper or aluminum: how to distinguish when handing over

One of the most critical moments for a scrap collector is determining the winding material before disassembly begins. If there is aluminum inside, then the labor costs of opening the casing may not be worth it. It is difficult to do this visually through the pipes, but there are indirect signs. Aluminum compressors are often lighter than analogues of the same power.

It is also worth paying attention to the marking and year of manufacture. If the refrigerator was manufactured after 2010 by a budget brand, the likelihood of having aluminum windings (or a bimetallic wire) is extremely high. Copper has a characteristic reddish-red color when broken, while aluminum is silvery-white. However, this can only be seen after the destruction of the stator.

⚠️ Attention: When trying to identify metal with a magnet, remember: neither copper nor aluminum are magnetic. Only the steel core and body are magnetized. Therefore, a magnet will not help to distinguish the winding from the winding, it will only confirm the presence of steel.

Experienced metal detectors often weigh the compressor and knock on it: the sound of copper and aluminum units may differ due to the different densities of materials and the design of internal fasteners, but this method requires a lot of practice. The most reliable way is to check the model table or selectively open one unit from the batch.

Technology for extracting copper from a compressor

The process of extracting non-ferrous metal from a sealed block is labor-intensive and requires compliance with safety precautions. First you need to cut off the top part of the casing (dome). For this, an angle grinder (grinder) with a metal disc is used. The cut is made in a circle, just above the weld connecting the base and the cover.

After removing the cover, access to the insides opens: valve group, pipes and the engine itself. High and low pressure copper tubes can be cut directly. The main array of copper is located inside the stator. To remove the winding, you often have to drill out one of the sides of the plate pack or saw the stator lengthwise in order to knock out the shaft and remove the coils.

The fastest but dirtiest method is to burn the windings in a fire or oven to burn the varnish and insulation. However, this method is extremely unecological, is prohibited by law in many regions and leads to the loss of part of the metal mass due to oxidation. Mechanical stripping or the use of chemical varnish solvents gives a cleaner and more expensive product at the output.

Economic feasibility and disposal

Is the game worth the candle? If we consider disassembling one or two compressors for a garage workshop, the economic effect will be minimal. The costs of electricity, grinder wheels and, most importantly, time, rarely pay off with the cost of 1 kg of copper. The situation changes when we are talking about processing batches of tens or hundreds of pieces of equipment.

In addition to copper, there are other valuable components in the compressor. The stator, after removing the windings, is sold as electrical steel, which is valued higher than ordinary ferrous scrap. The body and nameplates are high-quality steel. Oil drained during disassembly is a hazardous waste and requires special disposal; it cannot be poured into the soil or sewer.

It is also important to consider that collection points can accept entire compressors at the price of “heavy copper in a housing” or “mix”, which is often more profitable than spending hours on your own cutting The price of copper scrap is high, but the labor costs for extraction from a sealed block are significant.