HS Code 382499: 20 US Lines, All Under Section 301
Last updated October 29, 2026·Data as-of: HTS 2026-10-19 / Section 301 2026-10-16 / AD-CVD 2026-10-16
Short answer: HS 382499 — chemical preparations not elsewhere specified — is the clearest 301 case in this family: all 20 of its 20 eight-digit US codes are enumerated under a China action heading, 19 of them at 25%%. General rates run 2.8% to 6.5% (7 codes Free), so the schedule rate is a fraction of what the entry actually owes.*
What HS code 382499 covers
3824.99 is the residual chemical-preparation subheading: binders, blends, additives, foundry materials, mixtures defined by what they are not. Because the definition is negative, the entry line depends on composition percentages and on whether a more specific subheading already covers the product.*
The heading is a basket in the technical sense: the six digits fix the product family, and every distinction your invoice needs lives to the right of them. In our US schedule snapshot, 382499 expands to 32 formatted lines that collapse to 20 distinct eight-digit codes — the 20 codes are what a broker will ask you to choose between, and the extra digits distinguish units, uses and statutory notes.
How the heading splits: 20 eight-digit codes
The table lists every eight-digit code under the heading with its published general rate and, where one applies, the Section 301 action heading and rate that stacks on top. Reading the two rate columns together is the difference between a duty estimate and a guess.
The last column folds the Section 301 action and the stacked rate into one cell so the table stays readable on a phone.
| HTS line | Description | General | 301 action (stacked) |
|---|---|---|---|
| 3824.99.11 | In the form of ingots | Free | 9903.88.03 @ 25% |
| 3824.99.19 | Other | 6.5% | 9903.88.03 @ 25% = 31.5% |
| 3824.99.21 | Consisting wholly of substances found naturally in coal tar, whether obtained from coal tar or other source | Free | 9903.88.03 @ 25% |
| 3824.99.25 | Aqueous mixtures of triphenyl sulfonium chloride, diphenyl (4-phenylthio)phenyl sulfonium chloride and (thiodi-4,1- phenylene)bis(diphenyl sulfonium) dichloride | 6.5% | 9903.88.03 @ 25% = 31.5% |
| 3824.99.26 | Benzene, 2,4-diisocyanate-1,3,5-tris(1- methylethyl) homopolymer; 5-Fluoro-2-methyl-1-[[4-(methylsulfinyl)- phenyl]methylene]-1H-indene;Mixtures of dimethyl phthalate, t-butanol, hydrogen peroxide, and sodium salicylate; andMixtures containing derivatives of N-[4-(2- hydroxy-3-phenoxypropoxy)phenyl]- acetamide | Free | 9903.88.03 @ 25% |
| 3824.99.29 | Other | 6.5% | 9903.88.03 @ 25% = 31.5% |
| 3824.99.31 | Of bismuth | 6.5% | 9903.88.03 @ 25% = 31.5% |
| 3824.99.32 | Of hydrosulfite compounds, of sulfoxylate compounds, or of both | 6.5% | 9903.88.03 @ 25% = 31.5% |
| 3824.99.33 | Of mercury | 4.2% | 9903.88.03 @ 25% = 29.2% |
| 3824.99.34 | Of molybdenum | 2.8% | 9903.88.03 @ 25% = 27.8% |
| 3824.99.35 | Of tungsten | 6.5% | 9903.88.03 @ 25% = 31.5% |
| 3824.99.36 | Of vanadium | 6.5% | 9903.88.15 @ 7.5% = 14% |
| 3824.99.39 | Other | Free | 9903.88.03 @ 25% |
| 3824.99.41 | Fatty substances of animal or vegetable origin and mixtures thereof | 4.6% | 9903.88.03 @ 25% = 29.6% |
| 3824.99.49 | Mixtures that are in whole or in part of hydrocarbons derived in whole or in part from petroleum, shale oil or natural gas | 6.5% | 9903.88.03 @ 25% = 31.5% |
| 3824.99.50 | Chlorinated but not otherwise halogenated | 6.5% | 9903.88.03 @ 25% = 31.5% |
| 3824.99.55 | Other | 3.7% | 9903.88.03 @ 25% = 28.7% |
| 3824.99.70 | Mixtures of dibromo neopentyl glycol; Polydibromophenylene oxide; Tetrabromobisphenol-A-carbonate oligomers; and Electroplating chemical and electroless plating solutions and other materials for printed circuit boards, plastics and metal finishings | Free | 9903.88.03 @ 25% |
| 3824.99.75 | Naphthenic acids, their water-insoluble salts and their esters | 3.7% | 9903.88.03 @ 25% = 28.7% |
| 3824.99.93 | Other | 5% | 9903.88.03 @ 25% = 30% |
Source: Recomputed from data/hts.json joined to data/section301_origin.json — https://hts.usitc.gov/reststop/exportList?from=0100&to=9999&format=JSON&styles=false (fetched 2026-10-19).
The twenty codes split by function and by hazard or composition class: ingots of a defined mixture sit next to aqueous mixtures and to preparations containing listed substances. Several lines carry a 'consisting wholly of' test, which is a composition threshold rather than a description.
The duty spread: 2.8% to 6.5%*
Across the 20 eight-digit codes, 7 carry a Free general rate and 25 carry an ad valorem rate between 2.8% and 6.5% (median 5%). 0 lines are charged on a specific or compound basis — cents per kilogram, or a compound rate — and those are the ones a percentage calculator silently gets wrong.*
Seven codes are Free and the rest cluster between 2.8% and 6.5% — a narrow band that makes the general rate look unimportant. It is, until the 301 layer is added.*
| General-rate bucket | Eight-digit codes | What it means on entry |
|---|---|---|
| Free | 7 | no ad valorem duty from the schedule |
| ad valorem 0.1%-5.0% | 16 | percentage of customs value |
| ad valorem above 5.0% | 9 | percentage of customs value |
| specific or compound | 0 | charged by weight or as cents plus percent |
Source: Rate buckets recomputed from data/hts.json records under the heading — https://hts.usitc.gov/reststop/exportList?from=0100&to=9999&format=JSON&styles=false (fetched 2026-10-19).
Section 301 overlay: 20 of 20 eight-digit codes (100.0%)*
This heading is a clean demonstration of why the schedule rate misleads: every eight-digit code is enumerated, and the dominant rate is 25%, which is four to nine times the general rate on the same line. A sourcing decision priced on the general rate alone understates the duty by roughly the whole margin of the deal.*
| Section 301 action heading | Additional rate | Eight-digit codes under it |
|---|---|---|
| 9903.88.03 | 25% | 19 |
| 9903.90.08 | 35% | 1 |
| 9903.88.15 | 7.5% | 1 |
Source: Per-code Section 301 enumeration extracted into data/section301_origin.json — https://hts.usitc.gov/reststop/file?release=currentRelease&filename=Chapter%2099 (fetched 2026-10-16).
Nationally the same programme covers 91.5% of the 11,414 eight-digit lines in our snapshot; the heading you are reading sits above that average, which is worth knowing before you assume a sourcing switch will save duty.*
Anti-dumping and countervailing exposure
Six case numbers in our Federal Register table list 382499 as a candidate code — more than any other heading in this family, reflecting chemical inputs with named-country cases.
Six-digit codes in our Federal Register case table: 6 case numbers list 382499 as a candidate code (AD 5, AD/CVD 2).
Classification disputes: 0 CBP rulings touch this heading
No CBP ruling in our CROSS sample starts from 3824.99. The classification risk on this heading shows up as laboratory analysis of composition rather than as published litigation, which makes the documentation burden the practical issue.*
| CBP ruling | Issued | Subject (CROSS title, truncated) |
|---|
Source: Sampled from data/cross_rulings_full.json where hs8_prefixes start with this heading — https://rulings.cbp.gov/api/ (fetched 2026-10-29).
Rulings are the closest thing to a precedent system US classification has: a published ruling on a comparable article is the strongest support available for the line you declare, and it costs nothing to cite one on your entry file.
Six digits are not enough for a chemical mixture
Neither 3824.99.99 nor 3824.99.97 appears in the US schedule snapshot; the subheading resolves further into codes that encode composition classes. If you are holding a ten-digit number from an EU TARIC lookup, it will not map onto a US entry line — the two schedules share the six-digit stem and diverge immediately after it.*
How to read the rate column on this heading
Three kinds of entry appear in the tables above and each needs a different arithmetic. Ad valorem lines are a percentage of the customs value and multiply cleanly. Free lines owe nothing from the schedule — 7 of the 20 codes here — but still owe the entry fee stack. Specific and compound lines are charged by weight or as cents plus a percentage; this heading has 0 of them, and a calculator that only understands percentages will report zero duty on those lines, which is the single most expensive silent failure in tariff tooling. The “stacked” column adds the Section 301 rate to the general rate only when both are ad valorem; where the general rate is specific, the two do not simply add.What this page does not measure
This page reports the schedule as extracted on the date in the header, plus the Section 301 enumeration and the CBP ruling and AD/CVD samples described above. It does not report search volume, CBP processing times, or examination rates — we hold no dataset for any of the three, and inventing a number for them would be the one thing a sourced page cannot do. Absence of an AD/CVD case or a ruling on this subheading means absence from the extractions we hold, not absence from the world; both tables record their own fetch dates so the gap is visible rather than implied.What to check next
For chemical preparations, get the composition percentage in writing before choosing a line: on this heading the line choice is what decides whether you owe the 25% addition.
Three checks settle most of the cost before you speak to anyone: run the code and origin through the landed-cost calculator, confirm the eight-digit line against the HTS browser, and check the code-and-country pair in the AD/CVD case table. The raw files behind all three are published under datasets.*
What is HS code 382499?
HS 3824.99 is a six-digit subheading of the US tariff schedule that expands into 20 eight-digit codes and 32 formatted lines in our snapshot; the six digits fix the product family and the digits to the right fix the rate.*
How many US tariff lines are under 382499?
32 formatted lines, collapsing to 20 distinct eight-digit codes — that second number is the one a broker needs from you.
What duty rate applies to 382499?
General rates are 2.8% to 6.5% (median 5%) on the 25 ad valorem lines and 7 codes are Free — before the Section 301 addition, which on this subheading is 25%% on 19 of 20 codes.*
Is 382499 subject to Section 301?
20 of the 20 eight-digit codes under this subheading (100.0%) are enumerated under a China Section 301 action heading in our snapshot, at the rates listed in the table above.*
Can I declare 382499 directly?
No. Only a complete HTS line (eight or ten digits, depending on the line) can be declared; the six-digit subheading is a lookup key, not an entry line.