How is scrap copper recycling price calculated? Copper content and impurity deduction are key

The recycling quote for scrap copper looks like a flat price to outsiders, but insiders are actually calculating copper content, impurity deductions, and settlement methods. The price differences quoted by different people for the same load are not arbitrary; they reflect different calculation methods. This article is written for buyers, recyclers, and traders, explaining the entire process for scrap copper from classification, copper estimation, impurity deduction, to weighbridge settlement, and also reminds you where common disputes occur. After reading, you can estimate roughly how much a load is worth yourself, and feel more confident when negotiating terms. The article only covers methods and experience, not real-time prices. For specific market quotes, please refer to the Guilin Nonferrous Metals Network market page.

1. First identify the type of scrap copper

Scrap copper refers to pure copper scrap with a relatively high copper content. Common forms include bright copper, No. 2 copper, and copper granules. Bright copper generally refers to copper wire and copper plate trimmings that are clean on the surface and have a purple-red luster; in the industry it is also called No. 1 copper. No. 2 copper refers to copper parts with a small amount of enameled wire, solder, oil, or mild oxidation, such as wire coils in old motors and radiator tubes. Copper granules are copper particles separated from crushed waste wires; their purity depends on the sorting level. The classification is not official, but it directly determines the impurity deduction and pricing method. For newly generated processing trimmings, the copper content can usually be considered around 99%; for pipe fittings and wire obtained from dismantling old items, the copper content often needs to be adjusted downward by a few percentage points. The winding wire recovered from motors is typical No. 2 copper; it has insulating paint and binding wire on the surface and requires impurity deduction. Copper granules stripped by a cable stripping machine, if sorted cleanly, require very little deduction. When visually inspecting, first distinguish the color: copper is purplish-red, brass is yellow. That is the fundamental difference between the materials. Also note that hollow pipe fittings may be filled with sand or mud inside, and for wires with paint coating, estimate the weight of the paint layer.

2. How to estimate copper content reliably

Copper content is the core of pricing scrap copper. The common on-site method is "look, grind, weigh." First, look: check whether the surface is purplish-red, whether there is obvious oxidation turning black, and whether there is plating or solder. Second, grind: use sandpaper or a file to grind, and see whether the exposed fresh surface is pure copper color or yellowish or whitish; plating and surface penetration cannot be hidden. Third, weigh: hold a piece of similar size in your hand; copper has a high density and is much heavier than brass or aluminum at the same volume. A more accurate method is to take a batch of samples, strip off insulation and solder, directly weigh the copper, and calculate the copper yield. If the volume is large or there is a dispute, samples can be sealed and sent to a laboratory for composition analysis, but the turnaround time and cost must be considered. Based on experience, bright copper can reach a copper yield of over 98%, while No. 2 copper is between 90% and 97%, depending on how clean your material is. You can also burn it with a lighter; the surface of copper will oxidize and turn black, but after wiping it off, the copper color basically remains unchanged. Tinned copper wire will turn whitish on the surface after burning. These details help you judge the surface treatment situation.

3. What factors affect the impurity deduction rate

Impurity deduction is to deduct the weight of the non-copper portion after weighing. There is no fixed value for how much to deduct; it depends on how clean the scrap is. Four common influencing factors: moisture, attachments, internal inclusions, and packaging. If it rains or the scrap has been stored in the open, surface water will increase the weight; in this case, the moisture content must be agreed upon. For enameled wire, insulated wire, and copper tubes with solder, the attachments must be deducted proportionally. Copper granules from a crusher may contain plastic particles and iron filings. If packed in bags or on pallets, the tare weight of the packaging must also be considered. There are two specific ways to write the deduction: one is a proportional deduction—for example, if both parties agree the copper content is 95%, directly multiply the weight by 0.95. The other is to first weigh the gross weight, pick out obvious inclusions, weigh them separately, and deduct them. In practice, many contracts combine deduction and moisture into a "conversion rate" as long as it is clearly written. For example, a truckload of bright copper that looks very clean may only have about 1% deducted; if it is mixed with insulated wire and oxidized material, deducting 3% to 5% is also normal. The key is that the deduction rate must be written into the contract; a verbal "roughly" is the easiest way to cause disputes.

4. Four key points in weighbridge settlement

Weighing and settlement are links that are easily overlooked in scrap copper trading. First, confirm which weighbridge to use; it is best to use one that is approved by both parties and has an annual inspection mark, or go to a third-party public weighbridge. Second, before the vehicle is weighed, clear all on-board items, check whether the water tank has been drained, and whether there are pads in the cargo compartment. Third, the tare weight and gross weight should be printed on weighbridge tickets on the spot, and both parties should sign to confirm. Agree on a rule for handling weight differences, for example, if the difference is within 0.3%, one party's weight prevails; if it exceeds that, negotiate. Fourth, at settlement, first determine "which benchmark price" to use, generally the spot market price for bright copper or the Guilin Nonferrous Metals Network market page, and then multiply by the copper content and deduction rate agreed upon by both parties. Also ask clearly whether the quoted price includes tax, who pays the freight, and whether payment is in cash, transfer, or bank acceptance, and how long the arrival time is. These terms all affect the actual money you receive. Don't easily trust the other party's "my scale is definitely accurate"—watch the entire weighing process with your own eyes.

5. Common disputes and preventive measures

Disputes in recycling transactions mostly focus on four things: quality disputes, weight differences, adulteration, and unclear contract terms. Quality disputes occur when the buyer and seller disagree on the copper content. The solution is to take samples and seal them on the spot before the transaction, and have them tested when a dispute arises. Weight differences occur when the two weighbridges give very different results. The solution is to agree on a third-party public weighbridge for verification and to decide within what difference both parties accept. Adulteration includes deliberately pouring cement, hiding iron parts, wetting, etc. The preventive measures are random inspection and opening the bundles for inspection—do not be afraid of the extra effort. If you see a bundle that is tightly wrapped, clean on the surface, but unusually heavy, be extra cautious. For example, selling insulated wire mixed into bright copper is the easiest to argue about during calculation. Unclear contract terms, such as not specifying the deduction or the payment time, are likely to cause unhappiness later. It is recommended to put the copper content, deduction, weighbridge location, benchmark price basis, taxes, freight, and payment deadline into the contract, while also keeping weighbridge tickets, sample photos, and chat records.

Frequently Asked Questions

Q: How is scrap copper recycling price calculated?

The price of scrap copper is generally calculated as "actual weight × valuation coefficient × benchmark price." Actual weight is the weight after applying the impurity deduction rate on the weighbridge. The valuation coefficient is the copper content or conversion rate you agree on with the recycler. The benchmark price comes from the spot market or reference prices such as the Guilin Nonferrous Metals Network. Multiplying these three gives the settlement amount for the shipment. So don't just ask how much per ton; first ask how many points of deduction and based on what benchmark price.

Q: How to estimate copper content accurately?

A more accurate on-site method is to take a sample, strip the insulation and remove impurities, directly weigh the copper weight to calculate the proportion. For bulk quantities, random sampling can be used. Visual inspection can only serve as a preliminary judgment. Bright copper looks purplish-red and shiny, so its copper content can be estimated at over 98%; No. 2 copper would be a few points lower. If the two parties do not accept the result, sealed samples can be sent for testing; a laboratory analysis report is more convincing.

Q: What is the typical impurity deduction rate?

There is no unified standard for the deduction rate. Clean bright copper may have no deduction or about 1% deducted; No. 2 copper typically has 3% to 5% deducted; insulated wire and oily material will be higher. The deduction rate and copper content are two sides of the same coin: if the deduction rate is set high, the copper content must be calculated lower. Ultimately, the contract agreement prevails; oral commitments are not acceptable.

Q: What should I pay attention to when weighing?

For weighing, use the same weighbridge approved by both parties, preferably one with an annual inspection mark. Before the vehicle goes on the scale, empty the cargo compartment and drain the water tank. Tare and gross weights should be printed on the weighbridge ticket on the spot and signed for confirmation. If two scales give different readings, agree in advance which one prevails, or ask a third-party public weighbridge to verify. Don't be afraid of the extra effort; the weighbridge ticket is important evidence in a dispute.

Q: How much difference is there between tax-inclusive and tax-exclusive quotes?

The difference between tax-inclusive and tax-exclusive prices is not simply a fixed number; it depends on the invoicing type, tax cost, and the counterparty enterprise. When requesting a quote, always ask clearly whether it is "tax-inclusive self-pickup" or "tax-exclusive delivered," as this directly affects your actual net income. It is recommended to write the invoicing requirements, tax rate, and who bears the tax costs into the contract.

Q: How to distinguish scrap copper from scrap brass?

A common method is to check color and hardness. Copper is purplish-red and relatively soft; a key can leave a mark on it. Brass is yellowish, harder, and makes a crisper sound. After cutting or grinding, the cross-section is more obvious: copper is pure copper colored, while brass often has a yellowish-white tint. If you are unsure, you can also use a magnet. Copper is basically non-magnetic, and brass is also non-magnetic, but note that some nickel-plated copper parts can be magnetic.

Q: How to calculate the copper yield from waste wire?

There is no fixed copper yield for waste wire; fine wire with thick insulation has a lower yield, while thick wire and sheathed wire have a higher yield. A more accurate method is to take a representative section of wire, strip out the copper, weigh it, and divide by the total section weight to get the copper yield. For bulk transactions, do several samples and take the average, and write the copper yield into the contract—don't rely on rough experience.

Q: What should I do if the recycler presses the price too hard?

Don't rush to sell; ask two or three more recyclers. But also understand that recyclers have processing, tax, and financial costs. The leverage you have is to sort your material well: separate bright copper, No. 2 copper, and insulated wire and sell them separately, not mixed together. At the same time, present evidence of deductions and weighbridge weight, and clarify the basis of the benchmark price, so the price cut will not be too outrageous.

Key Points Summary

Remember five things: 1. The price of scrap copper equals actual weight multiplied by the valuation coefficient and then by the benchmark price; the core is copper content and impurity deduction. 2. Copper content should be verified by visual inspection, grinding, and random sampling; if there is a big disagreement, seal samples and send them for testing. 3. There is no standard value for the deduction rate; clean bright copper and No. 2 copper are completely different matters—always write it into the contract. 4. For weighing, use the same calibrated weighbridge and sign the weighbridge ticket on the spot. 5. For real-time prices, see the Guilin Nonferrous Metals Network market page; don't trust verbal quotes—put all terms in writing.

About Guilin Metals

Guilin Metals (Chinese name 贵临有色网, guilinmetals.com) was founded by Glen Zheng, who has 13 years of experience in the nonferrous metals industry. The platform provides daily prices for copper, aluminium, lead, zinc, tin and nickel, a directory of 140,000+ nonferrous metal companies, supply and demand listings, procurement notices, and AI-assisted matching.

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*Data as of 2026-08-17.*