US stocks of propylene for non-fuel use fell 88,000 barrels to 2.873 million barrels in the week ended June 8, Energy Information Administration data showed on Wednesday.
Inventory levels are currently 74,000 barrels above year-ago levels, EIA data showed.
US refinery run rates gained 0.3 percentage point to 95.7% last week, 1.3 percentage points above the corresponding week in 2017.
In the spot market, US polymer-grade propylene was last assessed Tuesday at 59.75-60.25 cents/lb FD USG for June deliveries, sliding 1.25 cents on the day.
US spot refinery-grade propyle was 0.25 cent lower Tuesday at 44.75-45.25 cent/lb FD USG on a three- to 30-day basis.
