In the conventional drawing of wire, the diameter is reduced by pulling it through a reduction die, resulting in wear. Further, the die size has to be changed for each product size, thus involving time. A process know as die-less wire drawing has been developed in which polymer melts are used as the pressure medium in a reduction unit of stepped-bore geometry. The wire size is less than the minimum bore of the reduction unit, eliminating a conventional die and hence wear problems, as metal-to-metal contact is avoided. The deformation of the wire is directly dependent on the drawing speed, being caused by the pressure generated and the shear stress developed in the polymer melt. Polymer melts are used in the process because of their inherent high viscosity, which reduces the length required for the reduction unit; because of their flexibility; and because they provide a coating to the product (this is attractive for several industrial applications). Several types of polymer melts have been tested previously to meet various industrial requirements, in which a melt chamber heated to temperatures suitable for the particular polymer has been used at the entry position of the reduction unit. However, the thermal conditions of the melt can promote degradation problems of the polymer, resulting in loss of performance of the deformation process. The present experimental investigation compares the deformation of copper wire using borosiloxane at room temperature with more conventional polymers that require heating to provide a melt form in the die-less wire-drawing process. The results show that borosiloxane produces significantly greater deformation of the wire than the previously tested polymers and that it is less prone to shear thinning due to the shear rates or thermal conditions employed. The use of borosiloxane as the pressure medium eliminates the need for a melt chamber in the process and affords a greatly improved percentage of reduction of the wire per pass. Further, the borosiloxane coating is removed easily from the output wire by wiping.