Houston-Historical spreads between refinery grade propylene,chemical grade and polymer grade propylene got tighter still as spot RGP continued to trade higher while PGP's upside was debated.Spot refinery grade,which has traded many times in August at 47.5 cents/lb - at parity with August RGP contracts - traded higher August 23,at 48.375 cents/lb FD USG,but the question remained:will polymer grade cap this chain's upside?
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