Hot-melt adhesives may be made with either liquid or solid plasticizers, depending on the properties desired in the end product. "Santicizers" M-17 and 160, and dibutyl phthalate are favored because of their excellent heat stability and mild odor. Of the solid plasticizers, diphenyl phthalate and "Santicizer" 1-H are preferred because they have the least odor and are in the proper melting-point range for most applications.