4002.19.00

Analysis

HTS 4002.19.00 covers styrene-butadiene rubber (SBR); carboxylated styrene-butadiene rubber (XSBR): other under heading 4002 (synthetic rubber and factice derived from oils, in primary forms or in plates, sheets or…). US Customs collects import statistics for it under 5 ten-digit suffixes, reported in kilograms.

This line's footnotes point to one additional provision in Chapter 99: 9903.90.08 (measures on products of Russia). Chapter 99 duties are added on top of the general rate for goods of the countries they name, and they change more often than the rest of the schedule, so check the current CBP guidance before you rely on a total.

There is no general-rate duty on this line, which puts it with roughly 39% of the 142 tariff lines in chapter 40 that are also free. Duty-free at the general rate does not rule out additional duties under Chapter 99, such as Section 301 or Section 232 measures, which depend on the country of origin.

The ten-digit suffixes separate styrene-butadiene-styrene block co-…, styrene-butadiene rubber produced by…, styrene-butadiene rubber produced by… and containing over 50 percent styrene by…. The duty is the same across them; the suffix matters for statistics, licensing and some quotas, and an entry needs all ten digits.