The question of the content of precious and non-ferrous metals in household appliances often arises among those who are faced with the disposal of old equipment or plan to scrap it. The compressor, which is the heart of the refrigeration system, is of particular interest to buyers because it contains copper windings inside. However, the exact weight of copper is not a fixed value and depends on many design features of the unit.
Many people mistakenly believe that the entire black compressor casing is a valuable metal, but in practice, copper makes up only a small part of the total weight of the unit. The bulk of the weight is taken up by steel, oil and refrigerant. Understanding the real situation helps to avoid unreasonable expectations when assessing the cost of decommissioned equipment and correctly calculate the profitability of its disassembly.
In this article we will analyze in detail what the amount of copper depends on, how to roughly calculate the yield of useful metal and what nuances exist when handing over compressors to collection points. Real value determined not only by the weight, but also by the purity of the metal, as well as the current exchange price situation.
Compressor design and metal distribution
To understand where copper comes from, you need to look at the internals of a piston compressor, which is the most common type in household refrigerators. The motor, hidden inside a sealed steel housing, consists of a stator and a rotor. It is in the stator grooves that there is a winding made of copper wirewhich is of interest to processors.
In addition to the winding, copper is used in discharge and suction tubes, as well as in valve groups, although the volume of metal in these elements is much less. The main weight of the structure falls on the steel casing, electrical steel core and cast iron or steel piston groups. The ratio of metals varies depending on the manufacturer and year of manufacture.
Modern models often move towards miniaturization and the use of lighter alloys, which can reduce the overall weight of the assembly, but the concentration of copper in the winding remains critical to motor efficiency. It is important to note that inverter compressors may have an internal architecture different from classical models, which also affects the composition of the scrap.
⚠️ Attention: Inside the compressor there is technical oil, which is strictly prohibited from being drained into the soil or sewerage system. When disassembling or scrapping, it is necessary to comply with environmental standards and dispose of waste through specialized points.
The weight of copper directly depends on the engine power. The more powerful the refrigerator (for example, two-compressor models or large-volume No Frost units), the more massive the winding and, therefore, the greater the non-ferrous metal content. In low-power models for minibars, the amount of copper will be minimal.
Factors affecting the weight of copper in the unit
There is no single formula that allows you to determine the amount of copper with an accuracy of a gram without opening the compressor. However, there are a number of factors that allow us to make a fairly accurate assumption. First of all, this is electric motor powerindicated on the nameplate or in the technical documentation.
The second important factor is the year of production and the country of origin. Soviet refrigerators and models produced in Europe in the 80-90s were often distinguished by a greater margin of safety and the use of thicker copper wire in the windings compared to modern budget mass-market appliances. Chinese compressors of recent years may be lighter.
The type of refrigerant and the design of the cooling system also influences. Units running on older freons often had more massive designs. In addition, the condition of the compressor itself plays a role: a burnt-out motor may have damaged insulation, which complicates the extraction process, but does not change the physical weight of the metal.
- 🔌 Power: Motors with power over 200 W contain significantly more copper than low-power counterparts up to 100 W.
- 🏭 Manufacturer: European brands (Danfoss, Secop) historically use more non-ferrous metals than some budget Asian brands.
- 📅 Year of manufacture: Older models (before 2000) often have heavier and “slower” pure copper windings.
- 🧊 Cooling type: Compressors for No Frost systems are often more powerful than for static cooling, therefore, they contain more copper.
Average indicators: copper weight table
Based on the analysis of data from scrap collection points and the results of opening various models, average values can be derived. It is worth understanding that the figures are approximate, since design changes manufacturers are constantly making them.
Usually from one standard household compressor it is possible to obtain from 100 to 250 grams of pure copper. This is approximately 10-15% of the total mass of the node. The rest is steel, oil and other materials. For industrial or powerful refrigerated display cases, these figures can be significantly higher.
| Compressor type | Total weight (kg) | Copper weight (grams) | Output percentage |
|---|---|---|---|
| Low-power (up to 100 W) | 8 - 10 | 80 - 120 | ~1.0% |
| Average power (100-200 W) | 10 - 12 | 130 - 200 | ~1.5% |
| Powerful (more than 200 W) | 12 - 15 | 200 - 300 | ~2.0% |
| Soviet (KhK, Biryusa) | 15 - 18 | 250 - 350 | ~1.8% |
As can be seen from the table, even in the heaviest household models the amount of copper rarely exceeds 300-350 grams. Therefore, assembling and delivering compressors for the sake of copper in small volumes (1-2 pieces) often does not pay for the time and effort, if you do not take into account the cost of ferrous metal and housing.
Why is the weight of copper so small?
Copper is used only for winding coils and thin tubes. The main mass of the engine is electrical steel, which has magnetic properties, but is much cheaper than copper.
Economic feasibility and scrap price
The cost of scrapping a compressor consists of the price of copper (non-ferrous scrap) and the price of steel (black scrap). Reception points often evaluate assembled compressors as ferrous scrap with an additional payment for copper content, or require mandatory disassembly payment at the price of non-ferrous metal.
If you plan to hand over the compressor unassembled, it will most likely be weighed as black steel or as a “mix” the price for which is significantly lower than the cost of pure copper. To get the maximum benefit, it is necessary to remove the copper winding, separating it from the steel core.
However, the extraction process is labor-intensive and requires special equipment or significant physical effort (cutting the casing, burning out the insulation, which is environmentally harmful). It is often easier to hand over the entire unit, especially if we are talking about 1-2 units.
The market price for copper scrap fluctuates and depends on LME stock exchange quotations. Steel is much cheaper. Therefore, even if you find a way to extract 200 grams of copper, you will not receive as large an amount as it might seem at first glance, if you do not take into account labor costs.
⚠️ Attention: Prices at collection points can vary significantly. Before your trip, check whether they accept assembled compressors and how they classify this type of scrap (as electric motors, as a mix or as ferrous metal).
The copper extraction process: instructions and risks
If you decide to extract copper yourself, you will need a set of tools: an angle grinder, hammer, chisel and protective equipment. The process begins with cutting the steel casing along the weld seam. After opening, the oil is drained, and access to the engine is opened.
Next, you need to disconnect the stator with the winding. The fastest, but dirtiest way is to burn the winding to remove the varnish insulation and easily pull out the wire bundles. However, when insulation is burned, some of the weight is lost and toxic substances are released, so this method is not recommended at home.
A cleaner method is to mechanically knock out copper from the stator slots. This takes time and effort, but allows you to maintain the quality of the metal and get a higher price upon delivery. Pure copper without insulation and impurities is valued above all.
☑️ Tools for disassembly
When sawing the body, sparks can ignite oil or freon vapors, so all work must be carried out outdoors, away from sources of fire, in compliance with safety regulations.
FAQ: Frequently asked questions
Is it possible to hand over the entire compressor without disassembling it?
Yes, most scrap metal collection points accept assembled compressors. However, in this case they will be valued at the price of ferrous scrap or electric motors, which is much cheaper than the cost of copper.
Does the compressor contain gold or silver?
Precious metals (gold, silver, platinum) are not used in standard household compressors. The basis is copper, steel, aluminum (in some tubes) and insulating materials.
Does the brand of the refrigerator affect the amount of copper?
Yes, it does indirectly. Premium brands and older models often have more massive engines with a large supply of copper, while in modern budget models, manufacturers seek to minimize the use of expensive materials.
Is it dangerous to open a compressor at home?
Yes, it is dangerous. Inside there is technical oil that can ignite, as well as refrigerant residues. When using an angle grinder, sparks are generated. Fire safety measures and good ventilation are necessary.