Platinum and palladium have long dominated the investment narrative around platinum-group metals, largely because of their use in automotive catalytic converters. Rhodium also attracted attention after its dramatic 2021 price surge. Ruthenium, however, remains comparatively overlooked even as it becomes increasingly important to semiconductors, advanced memory, and green hydrogen.
Ruthenium is one of Earth’s rarest transition metals. It is exceptionally resistant to corrosion, has a melting point of 2,334°C, and offers valuable electrical, magnetic, and catalytic properties. Historically, it has been used in chemical catalysts, hard-disk drives, resistor pastes, and corrosion-resistant coatings. Today, its growth potential increasingly comes from technologies central to the digital and low-carbon economies.
Annual ruthenium production is estimated at only about 30 tonnes. More importantly, the metal is not mined independently. It is recovered as a minor byproduct of platinum, palladium, and nickel operations, with more than 90% of the primary supply linked to Southern Africa. This makes supply highly inelastic. Mining companies will not develop a new multibillion-dollar shaft simply because ruthenium prices rise. Their decisions are based mainly on the economics of platinum, palladium, and rhodium.
That creates an unusual risk. If electric-vehicle adoption reduces demand for the major PGMs used in combustion-engine emissions systems, some South African mines could become uneconomic. Any closures would also reduce ruthenium production even if demand from semiconductor and hydrogen companies continued to increase. South African electricity shortages, labor disruptions, and high mining costs add further risk. Sanctions and geopolitical instability also threaten Russian supply. Complex refining processes mean lost production cannot be replaced quickly.
Advanced semiconductor manufacturing may become ruthenium’s most important growth market. Copper has served as the standard material for chip interconnects since the 1990s. At dimensions required for sub-2-nanometer chips, however, copper becomes less efficient. Electrical resistance rises sharply, while barrier layers needed to prevent copper diffusion consume an increasing share of each microscopic wire. Ruthenium performs better at these extremely small dimensions. It may require a thinner or no conventional diffusion barrier, resist electromigration, and tolerate high temperatures. Research organizations such as imec and IBM have demonstrated ruthenium interconnects using direct-metal-etch and semi-damascene processes.
Ruthenium also protects reflective masks used in extreme-ultraviolet lithography, the technology required to manufacture the world’s most advanced chips. In addition, atomic-layer and chemical-vapor deposition processes require specialized high-purity ruthenium precursors. The amount used per chip may be small, but demand is relatively price-insensitive. Ruthenium represents a minor input cost compared with the value of an advanced semiconductor fabrication line.
Ruthenium is also important to Spin-Transfer Torque Magnetoresistive Random Access Memory, or STT-MRAM. This non-volatile memory retains data without power and is being developed for automotive electronics, connected devices, and high-performance computing.
In STT-MRAM cells, ultra-thin ruthenium layers stabilize magnetic structures known as synthetic antiferromagnets. This improves thermal stability, reduces stray magnetic fields, and helps protect stored data as memory cells shrink. Green hydrogen represents another potential demand catalyst. Proton-exchange-membrane electrolyzers currently depend heavily on iridium, an even scarcer PGM. Ruthenium is more catalytically active but less stable in acidic conditions. Researchers and manufacturers are therefore developing mixed ruthenium-iridium and ruthenium-tungsten catalysts that preserve activity while improving durability.
Some commercial platforms claim to reduce iridium requirements by as much as 80%. If these catalysts prove durable at an industrial scale, ruthenium could help remove one of the largest material bottlenecks facing green hydrogen production.
Ruthenium’s established uses in hard drives, resistors, and chlor-alkali production provide a baseline of demand. Recycling spent catalysts, semiconductor targets, and electronic waste will also become increasingly important, although recovering ruthenium remains technically complex.
For investors, the market is difficult to access. Ruthenium trades mainly over the counter as high-purity sponge or powder. It lacks the deep futures markets, ETFs, and standardized bullion products available for larger precious metals. Price discovery is limited, spreads can be wide, and selling physical material may require specialist counterparties. These weaknesses also amplify volatility. Because the market is so small, a refinery outage or surge in industrial buying can create dramatic price spikes. Replenished inventories or weaker demand can produce equally severe corrections.
Nevertheless, the long-term thesis is compelling. Ruthenium combines geological scarcity and unresponsive supply with growing exposure to advanced semiconductors, non-volatile memory, and green hydrogen. It is no longer merely a minor PGM byproduct. It is becoming a strategically important material for the digital and low-carbon economy, and one investors can no longer afford to ignore.
