The question of how much copper is contained in a refrigerator compressor is of concern not only those who are engaged in the professional reception of non-ferrous scrap, but also home craftsmen planning to repair or dispose of old equipment. There is often an illusion that kilograms of precious metal are hidden inside a massive metal case, but reality dictates its own conditions. Actual output copper depends on many factors: the year of manufacture of the unit, its power, manufacturer and the type of refrigerant used.
On average, from one standard household compressor it is possible extract from 150 to 350 grams of pure copper. This is significantly less than the weight of the unit itself, which can reach 10-12 kilograms. The main mass consists steel caseof oil and steel plates of the electric motor. Understanding the exact metal content is critical to assessing the profitability of disassembly if you do not plan to hand over the entire device.
In this article we will take a detailed look at the design of the compressor, consider what determines the amount of copper in the windings, and provide average data for various models. You will also learn how to properly and safely dismantle valuable components without damaging them or getting injured when working with sealed high-pressure systems.
Compressor design and metal distribution
To understand exactly where the copper is hidden, you need to look inside the device. The hermetic compressor is a one-piece welded casing, inside of which there is an electric motor and the pumping unit itself. Engine stator this is exactly the part that is of interest for the extraction of non-ferrous metals. It consists of a set of steel plates in the grooves of which the winding is placed.
The winding is made of copper wire coated with insulating varnish. In modern models, the wire can be quite thin, which makes it difficult to quickly clean it from dirt and varnish. In addition to the stator, small amounts of copper can be found in the heat exchanger tubes (if they are not aluminum) and in the electrical contacts of the starting relay, although their weight is negligible compared to the winding.
It is worth noting that the design of different manufacturers can vary significantly. For example, in compressors Danfoss or Secop the winding may be wound more tightly or have a different geometry compared to analogues from Atlant or Indesit. This directly affects the final weight of the extracted raw material.
⚠️ Attention: There is oil inside the compressor and there may be refrigerant residue under pressure. When sawing the body, follow safety precautions and carry out work in a well-ventilated area.
The weight of the copper component directly depends on the power of the motor. More powerful units designed for two-chamber refrigerators or chest freezers contain more winding material. At the same time, compact motors from minibars or car refrigerators will produce a minimum amount of gram of metal at the output.
Factors influencing the weight of copper winding
There is no single figure that would be suitable for any refrigerator. The weight of copper varies depending on several key parameters. The first and main factor is engine power. The higher the power required to circulate freon in the system, the thicker and longer the wire is used, and the more turns are wound on the stator.
The second important aspect is the year of production and environmental standards. Old Soviet refrigerators running on R12 freon often had more massive engines with a larger safety margin and, accordingly, a higher copper content. Modern units using R600a (isobutane) refrigerants often have lower power and are optimized to reduce material consumption, which reduces the yield of non-ferrous metal.
Motor efficiency and energy efficiency class are also important. High-efficiency motors can use higher grades of electrical copper and special winding geometries to reduce losses, which sometimes increases weight, and sometimes, thanks to new technologies, allows for smaller dimensions while maintaining power.
- 🏷️ Power: 1/4 hp motors. contain less copper than 1/3 HP motors. and higher.
- 📅 Era of release: Equipment of the 80-90s is often “copper” than modern analogues due to other design standards.
- 🏭 Brand: European and American models (for example, Whirlpool, Electrolux) may differ in layout from Asian or Russian counterparts.
It is important to consider the condition of the compressor. If a device is burned, the copper can be oxidized and the insulation melted, reducing its value and making it more difficult to recycle. Rewind motors (which are rare, but found in the industrial sector) can use aluminum instead of copper, but in household hermetic compressors this is practically not used due to reliability requirements.
Table: Average copper yield from compressors of different capacities
For the convenience of assessing the potential production of non-ferrous metal, we present averaged data. Please remember that the figures are approximate, as production technologies change, and manufacturers do not indicate the exact weight of the winding in the specifications.
| Compressor type | Power (hp) | Total weight (kg) | Weight of copper (gram) |
|---|---|---|---|
| Low power (mini-bars) | 1/8 - 1/6 | 6.0 - 7.5 | 100 - 150 |
| Medium power (standard) | 1/5 - 1/4 | 9.0 - 10.5 | 180 - 260 |
| High power (2 chambers) | 1/3 - 1/2 | 11.0 - 13.0 | 280 - 380 |
| Industrial/Powerful | 3/4 and higher | 15.0+ | 450 - 600+ |
As can be seen from the table, even the largest household compressor is unlikely to release more than 400 grams of copper. This means that to obtain one kilogram of pure metal, you will need to disassemble from 3 to 5 pieces of equipment. When calculating profitability, it is necessary to take into account the cost of time, electricity for tools and depreciation of equipment.
There is a misconception that in old Soviet motors there can be up to a kilogram of copper. Practice shows that even in heavy units from refrigerators ZIL or Saratov yield rarely exceeds 350-400 grams, although the total weight of such a “monster” can reach 14-15 kilograms due to the thick metal body and massive rotor.
⚠️ Attention: The data in the table is relevant for standard piston compressors. Inverter models may have a different stator design, but the principle of copper content remains similar.
Technology for extracting copper from the stator
The copper extraction process begins only after you provide access to the insides of the compressor. The standard procedure involves cutting off the upper part of the casing (“cap”) with a grinder or a hacksaw. After opening, the electric motor becomes visible, sandwiched between the lower and upper covers.
To remove the stator (a set of plates with a winding), it is usually necessary to disconnect it from the housing and shafts. Often the stator is simply knocked out or drilled out. The most time consuming part is removing the copper winding from the plate stack. There are several methods: mechanical (cutting out one edge of the winding and pulling it out with a beam) and thermal (burning out the insulation), however, the latter method degrades the quality of copper and is harmful to the environment.
The mechanical method is considered the most correct for obtaining pure high-grade copper. You'll need a chisel, a hammer, and possibly some heavy-duty wire cutters. On one side of the stator, the winding is cut off, after which, on the other side, the wire is pulled out in whole bundles. This allows you to maintain the length of the wire and minimize losses.
☑️ Tools for disassembly
When delivering scrap to collection points, “burnt” or dirty copper can be valued at a lower price (like mix or wire), so cleaning from insulation and carbon deposits can increase the final revenue. However, spending time on chemical cleaning of a small amount of wire from one motor is not economically feasible.
Is it possible to speed up the process?
There is a method of heating the stator with a blowtorch until red hot, followed by rapid cooling with water, but this deforms the plates and can be dangerous due to varnish fumes. It is better to use mechanical removal.
Economic feasibility and scrap prices
Is the gamble worth the candle? Let's do the math. If the average weight of copper is 250 grams, then 4 compressors are needed to produce 1 kg of metal. At the time of writing, the price of copper scrap (wire, mix) fluctuates widely, but rarely exceeds the market value of non-ferrous metals. The bulk of the profit when handing over compressors is entirely achieved through volume.
It makes sense to hand over compressors in disassembled form (copper separately, steel separately) if you have already established a recycling process and have access to a free source of equipment. If you buy refrigerators specifically for copper mining, then most likely you will go into the red, taking into account the cost of purchase, transportation and time spent.
The steel case also has value, but the price for ferrous scrap metal is orders of magnitude lower than for non-ferrous scrap metal. Therefore, the main focus during recycling shifts to copper. However, even steel can be handed over to recoup part of the cost of electricity and tools.
The market dictates its conditions: collection points often accept entire compressors at the price of “electric motors” or “mix”, without requiring disassembly. In this case, you do not need to know the exact weight of copper, since you are handing over the device as a complex product. However, knowing the copper content helps prevent yourself from being deceived if you are handing over already disassembled metal.
Frequently asked questions (FAQ)
Is it possible to determine the weight of copper by the appearance of the compressor?
It is impossible to accurately determine the weight, but you can guess. Heavier and larger compressors (10-12 kg and above) usually contain more copper. Also, an indirect sign can be the power indicated on the nameplate: models with consumption above 200-250 W, as a rule, have more massive windings.
Is there aluminum instead of copper in the compressor?
In sealed household compressors, copper is almost always used. Aluminum windings are typical for cheap pumps or some types of household appliances (for example, washing machines or transformers), but in refrigerators that operate under high pressure and require reliability, copper is used because of its better electrical conductivity and ductility.
What to do with the oil inside the compressor when disassembling?
The oil from the compressor is waste petroleum product. It should absolutely not be poured into the sewer or onto the ground. Drain the oil into a separate container (plastic bottle) and take it to a special waste oil collection point or hazardous waste collection point.
Does the brand of the refrigerator affect the amount of copper?
Yes, it does indirectly. For example, compressors may have a slightly different layout and winding weight compared to compressors, but the difference rarely exceeds 10-15%. The main influence is not the brand, but the energy efficiency class and the year the model was developed. Embraco or Aspera may have a slightly different winding layout and weight compared to LG or Samsung, but the difference rarely exceeds 10-15%. The main influence is not the brand, but the energy efficiency class and the year the model was developed.
Where to find current prices for copper scrap?
Scrap prices change daily and depend on LME (London Metal Exchange) stock exchange quotes. It is best to find out the current cost in your region by calling the nearest scrap metal collection points or checking their websites, since conditions may vary depending on the volume of delivery and the purity of the metal.