Census Bureau trade statistics are compiled by mapping HTS tariff line data to NAICS codes using a concordance table. When a single HTS heading maps to a broad NAICS category — as is common with mixed or unspecified scrap — the value is reported at the higher aggregate level. Analysts needing commodity-level detail should work directly with HTS-level data rather than relying on NAICS aggregates.

No — admissibility and duty liability are determined by the HTS classification, not the NAICS code. However, certain scrap materials may require EPA import notifications or state environmental permits depending on their hazardous characteristics, and some scrap streams are subject to Section 232 or antidumping measures at specific HTS subheadings. A licensed customs broker familiar with secondary materials trade can identify the applicable requirements for a given scrap type.