After dodging the huge tariffs on exports of U.S. LPG and ethane to China — at least until August 12 — a new wrinkle has emerged. Enterprise Products Partners said in a filing May 29 that the U.S. Bureau of Industry and Security (BIS) has flagged its exports of butane and ethane to China as a security risk; specifically, that they pose an “unacceptable risk of use in or diversion to a military end use.” Details about the licenses and how they will apply are limited at this point, but it appears they will be required for these exports to continue. In today’s RBN blog, we examine the potential impact on the ethane and butane markets.