Quality focus is a critical element in achieving outstanding operations. The UNIPOL® process features guarantee that raw materials and catalyst, which are combined to form the resin, are of the highest quality. Guard beds on material feed streams minimize the effects of external upsets by protecting the reaction catalyst from the impurity spikes. On-stream analyzers ease troubleshooting impurity upsets in the raw material supplies. Once these high quality components reach the reactor, a superior product is assured through use of proven process models which facilitate computer control.