Substitutes

Substitutes and Alternatives for Holmium

The availability of viable substitutes is a key factor in assessing Holmium's criticality. Across its 2 primary applications, substitution options range from commercially viable alternatives with performance trade-offs to applications where Holmium currently has no effective substitute.

Substitution Analysis by Application

The following table details available substitutes for Holmium across its primary applications, including the trade-offs involved:

Performance Trade-offs

In most applications, substituting Holmium involves measurable performance penalties. Thulium fiber lasers are emerging as a competitor for lithotripsy; offer some advantages in stone dusting but Ho:YAG has decades of clinical validation and installed base. In high-performance applications such as strongest permanent magnets, these trade-offs can be particularly significant.

Research and Development

Active research programs are underway to develop improved substitutes and to reduce the amount of Holmium required per unit of product (thrifting). However, timelines for commercializing new alternatives typically span years to decades. The limited substitutability of Holmium is a primary driver of its high criticality rating, prompting government-funded substitution research programs.