A method for cooling components of installations charged with flowable media, in particular molding units for glass melts, and for direct cooling of molded glass parts. These techniques and apparatuses may configure data lines for authentication between host device and peripheral, use these configured data lines to authenticate the peripheral, and then reconfigure the data lines for use. In some embodiments, the optical circuitry includes a dielectric material having recesses disposed within, layers of a light waveguide material deposited within the recesses, and lenses disposed over each layer of waveguide material. The cable may be longer than the maximum length allowed by the USB specification. During the knitting process, the surface knit on the first needle bed and the surface knit on the second needle bed may be linked using an isolating thread network that is simply deposited, without forming a mesh, on the fabric, in order to provide the three-dimensional effect. More particularly, the process converts glycerol to acetol and then acetol to propylene glycol to produce a propylene glycol with ultra-low amounts of ethylene glycol.