Tumbling prices for polyethylene, polypropylene and PVC in North America are covered in this week's Material Insights video. Prices for PE, PP and PVC in the region each are down since May 1. PE is off by 7 cents, with PP slumping by 10 and PVC ticking down 2. The drops are tied in to more abundant supplies of ethylene and propylene feedstocks that have built up as several petrochemical crackers come back online after being down fro repairs. At the same time, early-year demand for PE is down, and PP demand is up less than three percent. PVC has bucked the trend with 5 percent demand growth. This week's video also takes a look at yet another plastics deal consummated by New York private equity firm Arsenal Capital. This time, Arsenal has bought Clifton Adhesives of Wayne, N.J., for an undisclosed price. Clifton makes adhesives based on thermoplastic polyurethane, polychloroprene and styrene-butadiene rubber. It's Aresnal's fourth plastics-related deal of the year.