Liquefied Ethylene, Propylene, Butylene & Butadiene

The HS nomenclature groups these four light olefins together at the 6-digit level because they share the characteristic of being gaseous hydrocarbons transported and traded in liquefied form. The US 10-digit schedule then provides separate lines for each individual olefin, allowing precise statistical tracking while maintaining the HS structure.

Canada is the primary foreign source of liquefied ethylene, propylene, butylene, and butadiene imports into the US. South Korea and Italy also rank among the top suppliers, with Mexico and China rounding out the leading origins.