Section 232 Aluminum Derivative Products List 2026: What Changed and What to Check

On August 6, 2026, the Bureau of Industry and Security published a Federal Register notice. It proposes adding 14 new derivative products to the Section 232 aluminum derivative products list 2026. The categories span aluminum, steel and copper items entering the United States. The public comment window closed on August 27, 2026. Therefore, the tariff rates on these categories are now moving toward a final determination.

For exporters and importers in Latin America and Europe, the question is no longer whether the list will grow. It is whether their specific product code is on it, and at what rate. This article covers what the notice includes, the rates attached to each group, and the customs valuation rule that sits underneath all of it.

What the Section 232 Aluminum Derivative Products List 2026 Covers

The official notice from the US Department of Commerce proposes 14 additional derivative articles for Section 232 coverage. According to PlasticsToday’s review of the proposal, the list includes aluminum powder and brass wind instruments. It also covers welding machine parts, safes, conductor cables, and fire extinguishers. Heat exchanger parts, hydraulic motor parts, and self-propelled cranes and forklift carriers round out the middle of the list. The remaining items are tanker trailers, self-loading or self-unloading agricultural trailers and semi-trailers, other trailers and semi-trailers, and certain filled steel containers.

Several of these categories are industrial parts, not raw metal. Cable, heat exchanger components, and machine parts all move through the same supply chains as primary and secondary aluminum. Therefore, a buyer who sources finished goods cannot assume the tariff conversation stops at ingots and coils.

Tariff Rates Are Not Uniform Across the List

The proposed rates split the 14 products into three tiers. Per Mallory Group’s summary of the comment period, most items would carry a 25% duty. Self-loading or self-unloading agricultural trailers and semi-trailers would instead face a 15% rate. Certain filled steel containers would be taxed at 50%.

This spread matters for anyone pricing a shipment before the rate is finalized. A 25% assumption on a product that actually falls under the 15% or 50% tier changes the landed cost calculation. For example, a fabricator quoting a tanker trailer at the general 25% rate could misprice the deal. If the applicable line is actually the 15% agricultural trailer category, the buyer overpays. If it is the 50% container category instead, the seller absorbs a loss.

The Full Customs Value Rule Changes the Base of the Calculation

The proposed 14-product expansion does not exist in isolation. Since April 6, 2026, Section 232 duties on aluminum, steel and copper have applied to the full customs value of the article and its derivatives. This is according to GHY International’s trade compliance briefing. The rule replaced an earlier approach that taxed only the metal-content portion of an item’s value.

This is the base on which the new derivative categories would apply. A heat exchanger part or a crane assembly is mostly non-metal by value. Under the old rule, it would have been taxed on a small fraction of its price. Under the current rule, the duty applies to the full customs value, regardless of how much metal the finished product actually contains. Many importers are still pricing as if the old rule were in effect. That understates the real exposure.

Tariffs Are Moving in More Than One Direction

The expansion of the derivative list is not the only tariff move underway. On August 20, 2026, Bloomberg reported that the September Midwest aluminum premium dropped 8.2%, to 95 cents per pound, according to Platts. The drop followed signals that the US administration would reduce tariffs on certain Canadian aluminum exports.

In other words, the same tariff structure that is expanding for 14 new derivative products is easing for a specific origin at the same time. This is not a contradiction. Section 232 measures apply differently by product category and by country of origin. However, it does mean a buyer cannot read “US aluminum tariffs” as one single, moving number. The rate depends on what is being shipped, and from where.

The Metal Underneath Is Still Getting More Expensive

None of this unfolds against a flat metal price. Trading Economics data puts aluminum at 3,278.15 USD per tonne as of September 1, 2026. That is up 1.62% for the month and 25.06% higher than a year earlier. So a buyer facing a possible new derivative tariff is also absorbing a base metal price that has already climbed a quarter over twelve months. The two costs stack, rather than offset each other.

This is a description of what has happened, and of the mechanisms driving it. It is not a forecast of where price or the tariff determination goes next. Anyone deciding whether to lock in a purchase or a shipment schedule should treat this as background for that conversation, not as the basis for it.

What to Check Before the Rate Is Final

Your product may fall near the 14 categories described above: cranes, trailers, heat exchanger parts, cables, extinguishers, or filled steel containers, among others. If so, the practical next step is to confirm the exact tariff classification your shipment falls under. Check whether that classification sits in the 15%, 25% or 50% tier. Because the rule now taxes full customs value rather than metal content alone, that classification step carries more weight than it did before April 2026.

Allinx works with buyers on exactly this kind of exposure. That includes confirming landed cost against the applicable tariff line, and reviewing country of origin against the duty schedule that currently applies to it. It also includes sourcing aluminum and related metallurgical materials through logistics that Allinx and the wider BiiSmart Group operate directly, including their own Shenzhen operation. For related background, see Allinx’s overview of the 2026 aluminum supply chain, its analysis of Chinese aluminum exports moving through Mexico, and its coverage of secondary aluminum sourcing under CBAM and the EU scrap duty.