US stocks of propylene for non-fuel use fell 15,000 barrels to 2.961 million barrels in the week that ended June 1, Energy Information Administration data showed on Wednesday.
Inventory levels are currently 167,000 barrels above year-ago levels, EIA data showed.
US refinery run rates gained 1.5 percentage points to 95.4% last week, 1.3 percentage points above the corresponding week in 2017.
In the spot market, US polymer-grade propylene was assessed unchanged Wednesday at 61.25-61.75 cents/lb FD USG for June deliveries.
US spot refinery-grade propylene was 0.75 cent higher Wednesday at 45-45.50 cent/lb FD USG on a three- to 30-day basis.
