A 90-day pause on the Trump administration's plan to hike tariffs on $200 billion in Chinese goods in January may delay higher consumer costs for everything from tires to galoshes, but the US petrochemical industry remains among the top targets of tariffs already in place and there is no obvious end in sight.Petrochemical-heavy 25% tariffs the US imposed on Chinese goods in August are not part of the temporary trade detente reached by US President Donald Trump and Chinese President Xi Jinping in early December at the G-20 Summit in Argentina.The two leaders agreed the US would hold off on raising 10% tariffs to 25% on Chinese goods -- many of which involve finished plastics products -- to allow the two largest global economies to negotiate a trade deal.