The question of how much copper is in the OKA 6M refrigerator often arises among owners planning to scrap old equipment, or among craftsmen involved in the restoration of units. OKA 6M is a legendary model Soviet-made, which is still found in many garages, country houses and old apartments. Understanding the internal structure of this equipment allows you to evaluate not only its operational characteristics, but also the approximate cost of the non-ferrous metals contained inside.
It is immediately worth noting that it is impossible to give an exact figure down to the gram without weighing each specific specimen on high-precision scales after cutting. However, based on the technical documentation of that time and the practical experience of processors, it is possible to determine the weight range with high accuracy non-ferrous metal. On average, the total copper output from such a refrigerator varies from 1.2 to 1.8 kilograms, but this mass is distributed unevenly among different nodes.
It is important to understand that the main volume of copper is concentrated in compressor and the pipeline system. The most valuable element for surrender is the compressor motor winding, which can account for up to 70% of the total mass of copper in product. The remainder goes to the evaporator and condenser, if they are made of pure metal and not copper-plated steel, which was sometimes found in later modifications or repairs.
Design features of the OKA 6M model
The refrigerator OKA 6M is a single-chamber unit with natural circulation of refrigerant. The design, developed in Soviet times, was distinguished by increased reliability and maintainability. Inside the housing is a complex system of tubes through which freon circulates. It is these tubes, along with the engine, that are the main source non-ferrous metal.
Many users mistakenly believe that the entire internal circuit is made of pure copper. In fact, alloys or steel could be used in different modifications. However, the classic version OKA 6M was equipped with high-quality materials. Heat exchanger in this model it was usually located on the rear wall of the case, which simplified heat transfer, but made the system vulnerable to mechanical damage during transportation.
The weight of the refrigerator itself is about 30-35 kilograms, which already indicates the presence of a significant amount of metal in the structure. The steel body and shelves make up the bulk, but it is the internal “filling” that is of value to processors. Disassembling such a unit requires certain skills and tools, since some connections can be soldered with refractory solders.
A distinctive feature of the model is the use of a hermetically sealed piston compressor. This device is the heart of the refrigerator and contains the most concentrated amount of expensive metal. When assessing scrap, it is important to take into account not only the weight, but also the condition of the components, since oxidation or previous repairs can reduce the yield of useful raw materials.
Analysis of the copper content in the compressor
The compressor is the heaviest and most valuable component in the refrigerator OKA 6M. This is where the electric motor is located, the windings of which are made of copper wire. Soviet units rarely used aluminum for windings, so you can count on a high yield of pure metal. The weight of the compressor itself is usually about 10-12 kilograms.
Extracting copper from a compressor is a labor-intensive process. It is necessary to carefully open the steel case without damaging the internal windings and remove the stator. Often, craftsmen simply weigh the entire compressor, using a conversion factor, since cutting takes a lot of time. Pure copper output from one such unit can be from 0.8 to 1.2 kilograms, depending on the specific engine series.
⚠️ Attention: Opening the compressor on its own can be dangerous due to residual pressure and oil. In addition, when insulation is burned to obtain copper, toxic substances are released, so this method is strictly not recommended.
If you plan to take the refrigerator to a scrap metal collection point, it is worth checking whether they accept compressors separately. Often the price per kg of compressor scrap is higher than for ordinary ferrous metal, but lower than for pure metal electrotechnical copper. Cutting makes sense only for large volumes or the presence of special equipment.
It is also worth noting that there is a special refrigeration oil inside the compressor. It must be drained before disposal or recycling as it is considered a hazardous waste. The presence of oil also increases the weight of the unit, which must be taken into account when preliminary calculating the mass of the useful output.
Pipelines and heat exchangers
The second most important part containing non-ferrous metal is the pipeline system. The model OKA 6M used tubes with a diameter of 4 to 8 millimeters. They connect the compressor, condenser, filter drier and evaporator. The total length of copper communications in such refrigerators can reach 10-15 meters.
The capacitor in this model is most often made in the form of a coil mounted on the rear wall. It is responsible for releasing heat to the environment. Heat exchanger can be made of steel, but high-quality Soviet models often used copper or brass to increase efficiency. The weight of this part of the system varies and depends on the degree of corrosion.
The evaporator, located inside the freezer or in the form of a shelf, can also contain copper, but is often made of aluminum or steel for better contact with food and lower cost. However, the connecting tubes going to the evaporator are almost always copper. When disassembling, it is important not to confuse the metals, since the price for them varies significantly.
To extract copper from the tubes, they are usually annealed or simply cut into segments. Thin-walled tubes they are easily crushed, which is convenient when transporting scrap. However, it is worth remembering that refrigerant vapor may remain inside the tubes, which is also undesirable to be released into the atmosphere unnecessarily.
Below is a table showing the approximate distribution of non-ferrous metals among the refrigerator components OKA 6M:
| Refrigerator assembly | Basic material | Approximate weight of the assembly (kg) | Copper output (kg) |
|---|---|---|---|
| Compressor (windings) | Copper/Steel | 10-12 | 0.8 - 1.2 |
| Condenser (coil) | Steel/Copper | 3-5 | 0.2 - 0.5 |
| Pipelines | Copper | 1-2 | 0.8 - 1.5 |
| Filter-drier | Steel/Zeolite | 0.2 | 0.05 (brass) |
The influence of modifications on the composition of the metal
Model OKA 6M was produced for a long time, and during this period the production technology could change. Early versions, as a rule, contained more non-ferrous metals, since in the Soviet period the task of austerity of resources was not set. Later modifications or units that have been repaired may have differences in design.
If the refrigerator was subject to major repairs, the craftsmen could replace sections of copper tubes with steel or aluminum analogues. This significantly reduces the overall value of the device in terms of scrap. Original components always valued higher than replaced parts of unknown origin.
It is also worth considering the condition of the metal. Corrosion, oxidation and the presence of paint reduce the class of scrap. Copper in good condition (shine, lack of green) is more expensive than burnt or oxidized. Therefore, the storage conditions of the refrigerator before disposal directly affect the final revenue.
In some cases, additional elements could be added to the design, for example, a weeping evaporator or a more powerful condenser. This may slightly increase the total weight of non-ferrous metals, but for the model OKA 6M such changes are the exception rather than the rule, given its simplicity.
Is it possible to determine the presence of copper using a magnet?
The magnet does not stick to pure copper and aluminum, but sticks to steel and nickel. However, many pipes are varnished or painted, and may also be bimetallic. Therefore, a magnet test gives only an approximate understanding, but does not guarantee 100% accuracy in determining the composition of the alloy.
Economic feasibility of disassembly
Is it worth disassembling the refrigerator yourself OKA 6M to obtain copper? The answer to this question depends on your goals and the tool you have. If you have one unit, then the time spent on disassembling, weighing and traveling to the collection point may not be worth it. The difference between the price of a whole refrigerator scrap and a cut one can be several hundred rubles.
However, if you are engaged in recycling equipment professionally or have several units of old equipment, then separation of metals it becomes profitable. Separated copper, aluminum and ferrous metal are sold at different rates, which in total gives a greater profit than delivery of the “mix.”
In addition, during disassembly you can save entire units that may be needed for repairing other refrigerators. Compressors from OKA 6M are still in demand among lovers of retro technology or for use in homemade compressors for airbrushing and inflating tires.
It is also important to consider the cost of tools and safety. For high-quality cutting, you need a hacksaw, keys, and possibly a grinder. Tool costs with a one-time promotion, they can exceed the cost of the metal received. Therefore, economic calculations must be made individually.
Rules for safe disposal
Disposing of refrigerators requires compliance with certain safety rules. First of all, this concerns the refrigerant. Older models OKA 6M used freon R12, which destroys the ozone layer. You can’t just release it into the atmosphere, although it’s difficult to control it in everyday conditions.
When sawing a compressor or pipes, metal shavings and dust are formed, which can be harmful to the respiratory tract. It is recommended to use respirator safety glasses. Also, sharp metal edges can cause injuries, so it is better to carry out work with thick gloves.
Oil from the compressor must be drained into a separate container and taken to special waste oil collection points. Pouring it down the drain or onto the ground is prohibited by environmental regulations. This is a thick technical liquid that takes a long time to decompose and harms the soil.
⚠️ Attention: Never try to light a fire from wire insulation or plastic parts of the refrigerator to obtain metal. When PVC and other polymers burn, dioxins are released - deadly substances.
By handing over a refrigerator to a specialized organization, you can be sure that it will be disposed of in compliance with environmental standards. Recycling plants have equipment to safely extract freon and sort waste. This is often more profitable and safer than handicraft disassembly.
Comparison with modern analogues
If we compare OKA 6M with modern refrigerators, we can notice a tendency towards a decrease in the content of non-ferrous metals. Modern units are lighter, more compact and contain more plastic and aluminum. Copper is used more sparingly in them, and motor windings are often made of aluminum with a copper coating.
Soviet technology was distinguished by its safety factor and the use of natural materials. The weight of the compressor in modern models can be half that of OKA 6M, with comparable performance. This suggests that old units are a more valuable source of secondary raw materials.
However, modern refrigerators are more energy efficient. Electricity consumption OKA 6M is significantly higher than that of class A+++ models. Therefore, from an economic point of view, the operation of an old refrigerator can be unprofitable, even if it is in working order.
The table below shows a comparison of some characteristics:
| Parameter | OKA 6M (USSR) | Modern refrigerator |
|---|---|---|
| Compressor mass | 10-12 kg | 5-7 kg |
| Winding material | Copper | Aluminium/Copper |
| Refrigerant | R12 (Freon) | R600a (Isobutane) |
| Average service life | 20+ years | 10-15 years |
☑️ Checklist before handing over the refrigerator
Frequently asked questions (FAQ)
Can a compressor from OKA 6M be used for others goals?
Yes, compressors from OKA 6M are often used to create homemade compressors for airbrushing, inflating tires or pneumatic tools. They are characterized by quiet operation and durability, but require the installation of a receiver and an oil-free air purification system.
Why do some sources indicate the weight of copper is different?
The difference in numbers is due to modifications of the model, year of manufacture, as well as the degree of wear and previous repairs. In addition, some sources take into account only the windings, while others take into account the entire volume of non-ferrous metal in tubes and heat exchangers.
Where is the best place to hand over an old refrigerator?
It is best to hand over the refrigerator to specialized collection points for household appliances or call a recycling service. This guarantees environmentally safe extraction of freon and proper waste sorting. Taking it to a regular scrap metal point is also possible, but they may not take into account the value of non-ferrous metals.
Does the year of manufacture affect the amount of copper?
Yes, earlier models produced in the 60-70s, as a rule, contained more copper and less plastic. Over the years, manufacturers have sought to reduce the cost of construction by replacing non-ferrous metals with cheaper analogues and composites.
Is it worth buying OKA 6M for the sake of copper?
Buying a refrigerator solely for the sake of extracting copper is usually impractical. The cost of purchase and the cost of transportation and disassembly will most likely exceed the proceeds from the sale of scrap. This only makes sense if you got the refrigerator for free.