US stocks of propylene for non-fuel use rose 37,000 barrels in the week that ended August 18 to 2.824 million barrels, Energy Information Administration data showed Wednesday.
Current inventory levels are 627,000 barrels higher than at the same point a year ago, according to the data.
US refinery run rates last week fell 0.7 percentage point to 95.4%, and sat 2.9 percentage points higher than the year-ago week, the EIA data showed.
In the spot market, US polymer-grade propylene for the prompt month was assessed stable Wednesday at 39.75-40.25 cents/lb FD USG. US spot refinery-grade propylene was assessed unchanged at 26.25-26.75 cents/lb FD USG.
