Sponge hafnium is a rare metal material.

Usage: Used in the atomic energy industry and aerospace industry. Used as control rod material for atomic reactors, it can be used as a small and high-energy rocket booster. Physical state: Hafnium and zirconium have the same appearance and extremely similar properties, with the main difference being their nuclear properties. For example, zirconium has a thermal neutron capture cross-section several hundred times smaller than hafnium. The delivery granularity requirement is 3-25 millimeters, with no more than 5% of materials smaller than 3 millimeters.