Your average thermal paste is a colloid—a liquid with solid ... typically a eutectic mixture of gallium, indium, and tin (GaInSn, often sold under the brand name Galinstan).
Achieving Lower Voids with a Novel Preform Flux Technology, presented by Research Chemist David Bedner, and co-authored by Lee Kresge, Igor Faleichik, Dan McElhinney, and Dr. Ricky McDonough.