The global market for primary copper and aluminum has tightened over the past 18 months, driven by supply disruptions, energy costs, and shifting demand from the energy transition. For mid-market buyers—those purchasing in volumes below the major exchange-traded contracts—the response has been a noticeable pivot toward secondary supply. Scrap metal, once a fallback option, is now a strategic input. But pricing that scrap is not straightforward. The 'basis'—the premium or discount applied to a primary metal price to reflect the value of a specific scrap grade—has become the central negotiation point.
This explainer breaks down how the scrap basis is currently being set for copper and aluminum, what is driving the changes, and what mid-market buyers should consider as they lock in supply for the coming quarters.
What Is the Scrap Basis?
The scrap basis is the difference between the price of a standard primary metal contract (such as LME copper or aluminium) and the price a buyer pays for a specific scrap grade. The basis accounts for several factors: the cost of processing scrap into a usable form, the quality and contamination level of the scrap, the logistics of collection and delivery, and the current supply-demand balance for that particular grade.
For example, a buyer of copper cathode might pay the LME cash price plus a premium. A buyer of No. 1 copper scrap (clean, unalloyed, and ready for remelting) might pay the LME price minus a discount, reflecting the need to melt and refine the material. The size of that discount—or in some cases a premium—is the basis.
In tight primary markets, the basis narrows because scrap becomes more competitive. But the basis is not uniform across grades. High-quality scrap with low contamination commands a smaller discount, while lower-grade material with higher impurities sees a wider discount, reflecting the additional processing cost and the risk of quality issues.
Why the Basis Is Moving Now
Several factors are converging to push the scrap basis into sharper focus for mid-market buyers.
First, primary supply constraints. Major copper mines have faced operational disruptions, and aluminium smelters in Europe have curtailed output due to energy prices. This has reduced the availability of primary metal, particularly in regions that rely on imports. As primary supply tightens, buyers who previously sourced from primary producers are turning to scrap to fill the gap.
Second, the energy transition is increasing demand for copper and aluminium in cables, batteries, and lightweight components. This demand is not just from large OEMs; it is filtering down to mid-market manufacturers and fabricators who need consistent supply at predictable prices.
Third, the cost of carrying inventory has risen. With interest rates higher than they were a few years ago, holding large stocks of primary metal is expensive. Scrap, which can be sourced more locally and with shorter lead times, offers a way to reduce inventory carrying costs—but only if the basis is stable enough to plan around.
How Mid-Market Buyers Are Pricing Scrap
In practice, mid-market buyers are using a mix of index-based pricing and negotiated fixed differentials. The most common approach is to take a published primary price (such as the LME official price or a regional benchmark) and apply a fixed discount or premium for a specific scrap grade. This discount is often set quarterly or semi-annually, but in the current environment, some buyers are pushing for monthly reviews to reflect faster-moving market conditions.
Quality is the key variable. For copper, the main grades are No. 1 (clean, unalloyed), No. 2 (contaminated with solder or other metals), and bare bright (the highest quality, often used directly in wire production). The spread between No. 1 and No. 2 has widened in recent months, reflecting the higher cost of refining lower-grade material and the tighter specifications demanded by end-users.
For aluminium, the picture is similar. Clean, sorted aluminium scrap (such as old rolled or extruded material) commands a smaller discount to primary aluminium than mixed or painted scrap. The basis for aluminium scrap is also influenced by the availability of secondary ingot, which is produced by remelting scrap and casting it into a standardised form. Secondary ingot prices are often quoted as a discount to primary aluminium, but that discount has narrowed as primary supply has tightened.
Contract Strategies in a Tight Market
Mid-market buyers are adapting their contract strategies in three ways.
First, they are locking in longer-term supply agreements with scrap processors, but with more frequent price adjustment clauses. A quarterly review is becoming common, and some buyers are negotiating monthly price resets based on a published index plus a fixed differential.
Second, they are diversifying their scrap sources. Relying on a single scrap dealer is risky when the basis is volatile. Buyers are building relationships with multiple processors, often across different regions, to ensure they can source material at competitive prices.
Third, they are investing in in-house testing and sorting capabilities. The ability to verify the quality of incoming scrap is becoming a competitive advantage. Buyers who can accurately assess the copper or aluminium content of a load can negotiate a tighter basis, because they reduce the risk of paying for contamination they cannot use.
Commercial Impact
For mid-market buyers, the commercial impact of the scrap basis is direct and measurable. A 1% change in the basis on a monthly purchase of 500 tonnes of copper scrap can equate to tens of thousands of pounds in cost variation. In a market where primary supply is tight, the ability to secure scrap at a stable, predictable basis is a significant competitive advantage.
For scrap processors and dealers, the tightening primary market is an opportunity to capture more margin, but it also brings risk. Processors who can guarantee consistent quality and reliable delivery are in a strong position to negotiate favourable terms. Those who cannot may find buyers demanding wider discounts to compensate for the risk.
For end-users, the shift to scrap is not just a cost-saving measure; it is a supply security strategy. In a market where primary metal is scarce, having a reliable secondary supply chain is essential to maintaining production schedules.
Risks and Unknowns
The scrap basis is not a static number. It is influenced by factors that are difficult to predict, including global trade policy, energy prices, and the pace of the energy transition. For example, if primary copper supply recovers faster than expected, the basis could widen again, making scrap less competitive. Conversely, if primary supply remains tight, the basis could narrow further, squeezing processors' margins.
There is also the risk of quality disputes. As the basis narrows, buyers may be tempted to accept lower-grade scrap to save money, but that can lead to production issues and reputational damage. Clear specifications and robust testing protocols are essential to mitigate this risk.
Finally, the scrap market is less transparent than the primary market. Published indices exist, but they are based on surveys and may not reflect the actual prices paid in specific regions or for specific grades. Buyers should be cautious about relying solely on index-based pricing without understanding the underlying methodology.
FY Outlook
Over the next 12 to 18 months, the scrap basis is likely to remain a key focus for mid-market copper and aluminium buyers. Primary supply is expected to stay constrained, particularly for copper, as new mine projects face long lead times and permitting hurdles. Aluminium supply may improve if energy prices stabilise, but the outlook is uncertain.
Buyers should expect the basis to remain volatile, with wider spreads between high and low grades. Those who invest in quality verification and build strong relationships with multiple processors will be better positioned to manage this volatility. Contract flexibility—such as monthly price reviews—will become more common, and buyers who can negotiate these terms will have an advantage.
For processors, the opportunity is to differentiate on quality and reliability. In a tight market, buyers are willing to pay a smaller discount for scrap they can trust. Processors who can demonstrate consistent quality and on-time delivery will be able to command a premium basis.
Conclusion
The scrap metal basis is not a simple discount off the LME price. It is a dynamic, multi-factor pricing mechanism that reflects the real economics of secondary supply. As primary markets tighten, mid-market buyers are increasingly reliant on scrap, and understanding how the basis is set is essential for managing costs and securing supply.
The key takeaway is that the basis is moving, and it is moving differently for different grades. Buyers who treat scrap as a strategic input, rather than a fallback, will be better equipped to navigate the current market. That means investing in quality control, diversifying supply sources, and negotiating contracts that allow for flexibility in a volatile pricing environment.
For now, the scrap basis is a barometer of the broader metal market. Its movements tell you how tight primary supply really is, and how much value the market places on quality and reliability in secondary supply. For mid-market buyers, paying attention to that barometer is not optional—it is essential.
Why It Matters
For mid-market buyers of copper and aluminium, the scrap basis is now a critical cost and supply variable. As primary markets tighten, the ability to price and secure secondary supply accurately determines margin stability and production continuity. Understanding the basis is no longer a niche concern but a core commercial competency.
