Key Highlights

  • Automakers continue substituting platinum for palladium in autocatalysts, driven by platinum's relative price advantage.
  • The trend is providing structural demand support for platinum even amid near-term price weakness.
  • Platinum's market remains tight, set for a fourth consecutive annual deficit.

Beneath the day-to-day price swings in the platinum group metals market lies a slower-moving but consequential trend: automakers have been steadily substituting platinum for palladium in catalytic converters, a shift with meaningful implications for both metals' demand profiles heading into the second half of 2026.

Catalytic converters, which reduce harmful emissions from internal combustion engine vehicles, have historically relied on varying combinations of platinum, palladium and rhodium depending on engine type — diesel engines traditionally favouring platinum, and gasoline engines favouring palladium. However, automakers have flexibility in these formulations, and when relative prices shift meaningfully, manufacturers have both the economic incentive and technical ability to adjust the metal mix used.

That is precisely what has been happening. Palladium traded at a substantial premium to platinum for an extended period, giving automakers a strong financial incentive to re-engineer autocatalyst formulations to use more platinum and less palladium wherever feasible. That substitution trend has continued even as platinum trades near $1,630 an ounce, close to its lowest level since November 2025, because the relative price relationship between the two metals — rather than platinum's absolute price level — is what drives the substitution decision.

The demand impact of this shift has been structurally significant for platinum. Even amid broader precious metals weakness this week, tied to US-Iran tensions and inflation concerns, the substitution trend continues to provide an underlying source of demand growth that is independent of investment flows or safe-haven positioning. This is one of the factors contributing to platinum's tight fundamental picture, with the market on track for a fourth consecutive annual deficit and above-ground stocks projected to fall to just 2.3 million ounces — less than three months of global demand, according to the World Platinum Investment Council.

For palladium, the flip side of this trend has been a gradual erosion of a demand source it once dominated. While palladium remains essential for gasoline autocatalysts where platinum substitution is less technically straightforward, the ongoing shift illustrates how quickly demand patterns in industrial metals markets can adjust when relative pricing creates a clear economic incentive. As automakers continue to prioritise cost efficiency amid a broader industry transition toward electrification, the platinum-for-palladium substitution trend is likely to remain a persistent feature of the autocatalyst market, reinforcing platinum's structural demand base even during periods of near-term price softness.