Analysis
HTS 1520.00.00 covers glycerol, crude; glycerol waters and glycerol lyes under heading 1520 (glycerol, crude; glycerol waters and glycerol lyes).
Goods classified here enter the United States duty-free at the general (normal trade relations) rate, as do about 46% of the 37 tariff lines in chapter 15. 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.
It is the only US line under subheading 1520.00, 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 1520.00 points straight here.
Census statistics map these goods to NAICS 325611 (Soap and Other Detergent Manufacturing), an industry of 845 US establishments employing 33,783 people. That is the industry code a US manufacturer of the same product would normally use.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.