However, some sellers were still pushing for a higher price than the initial settlement, a buyer said.
Initial chemical grade propylene (CGP) settlements were heard at 71.0 cents/lb, down from 74.0 cents/lb in February.
The CGP seller that settled separately at 70.0 cents/lb in February would move up to 71.0 cents/lb under the initial March settlement, sources said.
The initial settlements represent a more conservative decrease than many downstream market watchers had forecast.
Over the past week, polypropylene (PP) buyers and sellers cited expectations of a 5-10 cent/lb drop on March contracts.
US PP demand was hammered by a 17 cent/lb contract increase in January, with February US PP operating rates estimated to be lower than 70%.
Rising crude oil prices and surging international propylene markets appear to have lent support to US monomer prices and prevented a larger drop in March.
A refinery grade propylene (RGP) spot deal was heard at 66.75 cents/lb Wednesday, up from bids at 61.00 cents/lb earlier in the week.
Major US producers of PGP and CGP include Chevron Phillips Chemical, Enterprise Products, ExxonMobil, LyondellBasell, Petrologistics and Shell Chemical.
($1 = €0.73)