Section 232 comment window closes August 27: 14 new derivative articles proposed

Commerce Department BIS published Federal Register 2026-15961 on Aug 6 2026. The notice opens a 21-day public comment window on adding 14 new derivative article categories to the Section 232 scope. Comments close 11:59 PM ET on August 27, which is T-9 from today.

This walkthrough covers what a derivative inclusion actually does to landed cost, the 14 categories in plain language, the substantive comment playbook for regulations.gov, and a worked stack on a hypothetical aluminum powder shipment showing the pre-versus-post inclusion delta.

What a derivative inclusion means in stack math

Section 232 currently runs at 50 percent ad valorem general (25 percent for UK-origin under the June 2025 Economic Prosperity Deal). The rate applies to metals covered under the original Section 232 orders (steel, aluminum, copper) and to a growing list of derivative articles: goods classified under chapters 84, 85, 87, 94 and others that contain steel, aluminum, or copper as a material input.

When BIS adds an HTSUS subheading to the derivative list, importers of goods classified under that subheading pay 232 at 50 percent (25 percent UK) on the metal value share, or on the full invoice value if a producer affidavit identifying metal content and smelt/cast country is not filed at entry. The affidavit-or-default rule tightened in June 2025.

The 232 layer stacks on top of the base MFN rate, any Section 301 List 1-4A layer if the origin is China, and the Section 301 forced-labor tier layer effective post-July-24-2026 for covered origins. Section 122 no longer stacks. USMCA-qualifying goods with US-origin metal content get partial relief on the US content share.

For a 200,000 USD CIF shipment of a covered derivative with 30 percent metal content by value, the 232 layer without USMCA is 200,000 x 0.30 x 0.50 = 30,000 USD (affidavit case) or 200,000 x 0.50 = 100,000 USD (default case). The default case is 3.3x the affidavit case. This is not a small drafting issue.

The 14 categories in plain language

The Federal Register 2026-15961 proposal covers 14 additional article categories. Here is the plain-language walk with example products.

1. Aluminum powder. HS 7603.10 (non-lamellar) and 7603.20 (lamellar). Buyers: pigment and paint manufacturers, refractory brick producers, thermite for welding, pyrotechnics, aluminum feedstock for metal 3D printing (additive manufacturing).

2. Brass-wind musical instruments plus parts and accessories. HS 9205.10. Trumpets, trombones, tubas, French horns, cornets. Parts include valves, slides, mouthpieces. Buyers: school music programs, professional musicians, retail chains.

3. Parts of welding machines and apparatus. HS 8515.90. Electrodes, torch heads, wire feeders, power supply components for arc, MIG, TIG, resistance, and plasma welders. Buyers: industrial fabricators, welding equipment distributors.

4. Floor safes. HS 8303.00 subset. Steel-body safes designed for floor installation. Buyers: retail, cash-handling businesses, gun owners.

5. Certain electric conductor cables. HS 8544 subset. Covered cables likely target insulated conductor products with copper cores that were not swept in the July 30 2026 copper smelt-and-cast rule.

6. Fire extinguishers. HS 8424.10. Portable and mounted extinguishers with steel or aluminum bodies. Buyers: safety equipment distributors, industrial buyers, retail.

7. Parts of heat exchange units. HS 8419.90 subset. Plates, tubes, headers, seals for shell-and-tube, plate, and finned heat exchangers used in HVAC, chemical processing, refrigeration.

8. Parts of certain hydraulic engines and motors. HS 8412.90 subset. Housings, pistons, valves, seals for hydraulic engines and motors used in construction and industrial equipment.

9. Certain self-propelled cranes, mobile lifting frames, and straddle carriers. HS 8426 subset. Rough-terrain cranes, telescopic-boom cranes, container straddle carriers used in port operations.

10. Tanker trailers and semi-trailers. HS 8716.31. Steel or aluminum-body trailers for liquid or gas transport (fuel, chemicals, food-grade liquids).

11. Self-loading or self-unloading trailers and semi-trailers for agricultural purposes. HS 8716.20. Grain, silage, and produce trailers with hydraulic tipping or auger systems.

12. Certain other trailers and semi-trailers. HS 8716.39. Flatbeds, dry vans, refrigerated trailers not covered under the tanker or agricultural subheadings.

13. Certain filled steel containers. HS 7310 subset. Prefilled steel drums, IBCs, cans containing consumable or industrial contents (paint, lubricants, chemicals, food).

14. Residual welding parts. Additional welding apparatus components not swept under category 3.

Importer playbook for filing a substantive public comment

The comment window closes 11:59 PM ET on August 27 2026. Filing on regulations.gov is free. Here is the structure that gets read.

Docket identification. Search regulations.gov for Federal Register 2026-15961 or the BIS docket number listed in the notice. Click Comment.

Comment header. Your legal entity name, US EIN, primary NAICS, product categories in scope, and role (importer of record, foreign producer, US downstream user, industry association).

Section 1: economic impact data. Actual entry volume last 24 months (units and CIF USD) by HTSUS classification within scope. Landed cost delta pre-versus-post inclusion, showing the current stack and the projected stack with the 232 layer added. Employment exposure (jobs at your facility or your customer base that depend on the affected volume). Working capital exposure (customs bond size, cash deposit change, days sales outstanding impact).

Section 2: alternative sourcing feasibility. US or FTA-partner supplier capacity for the article. Timing to qualify a new supplier (months to years). Quality or specification gaps. Certifications required (aerospace, automotive, medical, food-grade). Whether the domestic industry has published capacity utilization data that supports or contradicts a national-security nexus argument.

Section 3: national-security nexus challenge. Section 232 requires that the article at issue impair national security. For non-defense-critical categories (brass-wind musical instruments is the poster child), argue that inclusion strains the statutory basis. For dual-use categories (welding parts, hydraulic parts), argue that BIS should scope the inclusion narrowly to defense-critical subheadings.

Section 4: technical scope comments. Read the notice HTSUS language carefully. Comment on over-breadth (subheadings that sweep in non-metal articles), under-breadth (obvious substitute subheadings missed), and dual-use classification traps (articles that could be classified under two subheadings, one covered and one not).

Exhibits. Attach invoices with commercial data redacted, supplier certifications, industry association data, and any prior BIS or ITC filings on the same commodity.

Worked stack: aluminum powder shipment

Hypothetical: 200,000 USD CIF shipment of aluminum powder from China, HS 7603.10.00.

Pre-inclusion stack (today, Aug 18 2026).

Base MFN column 1 duty on HTS 7603.10.00: 5 percent ad valorem. 200,000 x 0.05 = 10,000 USD.

Section 301 List 3 layer on China origin at 7603.10.00: 25 percent. 200,000 x 0.25 = 50,000 USD.

Section 301 forced-labor tier A layer (effective July 24 2026) on China origin: 12.5 percent. 200,000 x 0.125 = 25,000 USD.

MPF at 0.3464 percent capped at 634.62: 634.62 USD.

HMF at 0.125 percent: 250 USD.

Pre-inclusion total duty: 85,884 USD (43 percent effective rate on CIF).

Post-inclusion stack (assume rule effective, no affidavit filed, full invoice default).

Base MFN 5 percent: 10,000 USD.

Section 232 at 50 percent on full invoice (default): 200,000 x 0.50 = 100,000 USD.

Section 301 List 3 layer: 50,000 USD.

Section 301 forced-labor tier A layer: 25,000 USD.

MPF cap: 634.62 USD.

HMF: 250 USD.

Post-inclusion total duty (no affidavit): 185,884 USD (93 percent effective rate on CIF).

Post-inclusion stack with producer affidavit (assume 100 percent aluminum content by value which is accurate for aluminum powder).

Section 232 at 50 percent on aluminum content share: 200,000 x 1.00 x 0.50 = 100,000 USD.

Same as the no-affidavit case because aluminum powder is 100 percent aluminum. For a downstream derivative like a welding wire feeder with 30 percent aluminum content by value, the affidavit case would be 200,000 x 0.30 x 0.50 = 30,000 USD versus the 100,000 USD default.

Delta from Section 232 inclusion on aluminum powder: 100,000 USD on a 200,000 USD shipment. The importer's landed cost jumps from 43 percent to 93 percent effective duty rate. Sourcing pivot to Canada under USMCA (if the smelter and cast are US or Canadian) becomes a first-order commercial question, not a nice-to-have.

For readers modeling the 232 layer against USMCA-qualifying alternatives or the UK 25 percent EPD rate, our Section 232 aluminum 50 percent calculator supports the metal share and country arrangement inputs.

What to do this week

If any of your inbound HTSUS classifications fall in the 14 categories, three things this week.

One. Pull entry history for last 24 months on the affected classifications. Quantify volume and landed cost baseline.

Two. Draft and file a substantive comment on regulations.gov before Aug 27 11:59 PM ET. Even a two-page comment with real numbers moves the needle if BIS is on the fence about scope.

Three. Coordinate with your broker on Chapter 99 heading assignment logic once the proclamation drops. Expect a mid-October to late-November effective date based on the Aug 19 2025 precedent. Cargo in transit on the effective date is likely subject to the new rate unless the proclamation carves an exception explicitly.

The 232 stack does not forgive late filers. Get the comment in and get the affidavit template on your PO now.