2508

Analysis

Heading 2508 of the Harmonized Tariff Schedule covers other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths. It divides into 6 six-digit subheadings and 6 eight-digit tariff lines, with 8 ten-digit statistical suffixes below them.

Every one of its 6 tariff lines is duty-free at the general rate, so classification within the heading affects statistics and Chapter 99 measures rather than the base duty.

The largest subheadings are 2508.10 (unnamed, 1 line), 2508.30 (unnamed, 1 line), 2508.40 (unnamed, 1 line) and 2508.50 (unnamed, 1 line).

By Census's concordance, most of its statistical lines are made by Sand, Gravel, Clay, and Ceramic and Refractory Minerals Mining and Quarrying (21232). Those are the NAICS industries a US producer of these goods would report under.

Its median rate of duty-free sits at the 46th percentile of the headings in chapter 25.