Analysis
HTS 3605.00.00 covers matches, other than pyrotechnic articles of heading 3604 under heading 3605 (matches, other than pyrotechnic articles of heading 3604). US Customs collects import statistics for it under 2 ten-digit suffixes, reported in kilograms.
For statistics it divides in two: 3605.00.00.30 for matches with natural wood stems and 3605.00.00.60 for other. Both pay the same duty; the suffix records which kind was imported.
The normal trade relations rate here is zero, shared by about 25% of the 16 tariff lines in chapter 36, a useful check when a neighbouring dutiable line is a candidate. Free here means free of the base duty only: origin-specific Chapter 99 duties such as Section 301 can still be owed.
It is the only US line under subheading 3605.00, so the six-digit code used by every Harmonized System country and the eight-digit US line describe the same goods; a foreign tariff or an exporter's invoice showing 3605.00 points straight here.
Census statistics map these goods to NAICS 325998 (All Other Miscellaneous Chemical Product and Preparation Manufacturing), an industry of 1,319 US establishments employing 42,583 people. That concordance is how imports of this line are compared with US output.