Thermal Pastes

Thermal paste (also called thermal compound, thermal lubricant, thermal gel, heat sink compound, heat sink paste) is a thermally conductive (but usually also electrically insulating) chemical compound that is commonly used as an interface between the heat source and the heating block or heat sinks of a 3D printer hotend to improve heat dissipation/transfer.

The main role of the thermal paste is to eliminate air gaps that act as thermal insulation from the interface area in order to maximize heat transfer and dissipation.