This dialog is used to specify the heat transfer coefficient (HTC) between the mold and the material.
You can set different values for the HTC to apply during filling, during packing, and when the part is detached (i.e., pressure is zero). You can set a different detached HTC for both the core and the cavity, for example, to model molding processes where the part remains in the cavity after the mold separates and before ejection.