Analysis
HTS 3811.11.50 covers based on lead compounds: other under heading 3811 (antiknock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers…).
Within this group the rate runs from duty-free to 6.5%. Compared with 3811.90.00 (antiknock preparations, oxidation inhibitors, gum inhibitors…), which pays 6.5%, a misclassification either way moves the duty by 6.5 percentage points.
The normal trade relations rate here is zero, shared by about 25% of the 179 tariff lines in chapter 38, 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.
Goods from countries without normal trade relations pay the column 2 rate of 25% instead of nothing, so origin decides between free entry and a 25% duty.
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.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 3811.11.10 | Based on tetraethyl lead or on a mixture of tetraethyl lead and tetramethyl lead | Free |
| 3811.19.00 | Antiknock preparations: other | 6.5% |
| 3811.21.00 | Containing petroleum oils or oils obtained from bituminous minerals | 6.5% |
| 3811.29.00 | Additives for lubricating oils: other | 6.5% |
| 3811.90.00 | Antiknock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives, for mineral oils (including gasoline) or for other liquids used for the same purposes as mineral oils: other | 6.5% |