Are commercial purging compounds mixed with other resins?
Among the three main types of purging compounds, there are several grades that are offered as concentrates. They are to be mixed with a carrier — either a commodity resin or the next material to be processed. The main problems with concentrates are: adding the right amount, hand mixing so that blend is uniform, stocking carrier and flushing resins. Please note that when using a concentrate and letting it down into the processor’s own carrier resin, the cost of the resin that is used should be included in the cost of purging. We refer to this as a hidden cost and often discounted by the user — the same can be said for the mixing time required. Dyna–Purge is a pre–blended, ready–to–run thermoplastic purging compound — uniform and consistent from lot to lot, drum to drum, box to box. It is easy to use, plus there are no hidden costs. Simply scoop or pour Dyna–Purge from the package right into the machine.
