Aluminum powder (HS 7603) is on the Section 232 inclusion list: what it means for pigment, refractory, and additive manufacturing importers
Federal Register 2026-15961 proposes adding aluminum powder (HS 7603.10 non-lamellar and 7603.20 lamellar/flakes) to the Section 232 derivative scope. Public comments close Aug 27 2026. Once effective, the 50 percent general (25 percent UK) 232 stack lands on a commodity used across pigments, refractories, thermite welding, pyrotechnics, and metal additive manufacturing. Here is the HS deep dive, the buyer map, the projected stack math, and the alternative sourcing playbook.
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Open calculatorAluminum powder is on the Section 232 inclusion list
Federal Register 2026-15961 (Aug 6 2026) proposes adding aluminum powder (HS 7603) to the Section 232 derivative annex. Public comments close 11:59 PM ET on August 27. Once BIS finalizes and CBP issues a CSMS, the 50 percent general (25 percent UK) 232 stack will land on aluminum powder imports with an explicit smelt-and-cast reporting requirement.
Aluminum powder is not a niche commodity. Pigment and paint, refractory bricks, thermite welding, pyrotechnics, and metal additive manufacturing all depend on it. This deep dive covers the HS structure, the buyer map, the current versus projected stack math, and the alternative sourcing playbook.
HS 7603: two subheadings, two very different products
Chapter 76 of the HTSUS covers aluminum and articles thereof. HS 7603 is the specific heading for aluminum powder.
7603.10 non-lamellar powder. Spherical, atomized, or irregular particles produced by gas atomization, water atomization, or mechanical grinding. Particle size typically 15 to 150 microns for additive manufacturing grades, 5 to 45 microns for fine chemistry applications, 50 to 500 microns for refractory and thermite grades. US statistical breakout 7603.10.00. Current MFN column 1 rate: 5 percent ad valorem.
7603.20 lamellar powder and flakes. Flat-shaped particles produced by wet or dry milling of coarser non-lamellar feedstock. Aspect ratio typically 20:1 to 200:1 with thickness in the 0.1 to 5 micron range. Used primarily as metallic pigment where the flat particle geometry creates the reflective sparkle effect in paint and coatings. US statistical breakout 7603.20.00. Current MFN column 1 rate: 3.9 percent ad valorem.
The two subheadings serve distinct downstream markets and generally are not interchangeable. Substitution across the 6-digit boundary is technically feasible in refractory and thermite applications but not for pigment or additive manufacturing.
The buyer map: five main use cases
Pigment and paint. Lamellar aluminum flake is the workhorse metallic pigment for automotive refinish, industrial coatings, and decorative paint. Major US buyers include PPG, Sherwin-Williams, Axalta, BASF Coatings. The typical aluminum flake share of a metallic paint formulation is 5 to 15 percent by dry weight, so the 232 stack impact per gallon of finished paint is meaningful but not catastrophic.
Refractory bricks. Non-lamellar coarse aluminum powder is a binder or reactive additive in high-alumina refractory bricks used to line steel, glass, and cement furnaces. Buyers include Vesuvius, RHI Magnesita, Saint-Gobain, HarbisonWalker. Aluminum content in refractory brick is 2 to 8 percent by weight for reactive grades, with the 232 stack impact absorbed by brick price passed downstream to steel and glass producers.
Thermite for rail welding. Coarse non-lamellar aluminum powder mixed with iron oxide is the standard thermite formulation used to weld rail joints in continuous welded rail (CWR) operations. Major US buyers include Goldschmidt (Boxholm to Chicago pipeline), Orgo-Thermit, Elektro-Thermit. Volume is modest but critical for rail infrastructure.
Pyrotechnics and defense articles. Fine non-lamellar and lamellar aluminum powder is used in fireworks (Silver Star effects), flash powder, propellants, and specialty munitions. US buyers include PGI members (Pyrotechnics Guild International), plus DoD prime contractors for defense end-uses. Import volume is heavily concentrated from Chinese suppliers for pyrotechnics and from domestic sources for defense.
Metal additive manufacturing. Gas-atomized spherical non-lamellar powder is the feedstock for laser powder bed fusion (LPBF), directed energy deposition (DED), and binder jetting of aluminum alloys (AlSi10Mg, 6061, 7075, Scalmalloy). Buyers include aerospace (Boeing, Airbus tier suppliers), medical device manufacturers, automotive prototype and small-series producers, and machine OEMs (EOS, SLM Solutions, GE Additive, Velo3D, Desktop Metal). This is the fastest-growing use case and the one where alternative sourcing has the longest qualification cycle.
Current versus projected stack math
Baseline: 350,000 USD CIF shipment of HS 7603.10.00 non-lamellar aluminum powder from China.
Current stack (Aug 18 2026 pre-inclusion).
MFN column 1 at 5 percent: 17,500 USD.
Section 232 at 50 percent (currently applied on chapter 76 primary aluminum forms via the broad sweep, but affidavit and reporting mechanics are less standardized than for the explicit annex derivatives): 175,000 USD.
Section 301 List 3 at 25 percent for China origin: 87,500 USD.
Section 301 forced-labor tier A at 12.5 percent for China origin (post-July-24 2026): 43,750 USD.
MPF cap: 634.62 USD.
HMF at 0.125 percent: 437.50 USD.
Current total duty: 324,822 USD (93 percent effective rate on CIF).
Post-inclusion stack (after Aug 27 comment, proclamation, and CBP CSMS effective).
The inclusion is expected to add explicit smelt-and-cast reporting fields on entry (matching the July 10 2025 aluminum reporting rule) and reduce ambiguity on the 232 layer application. The stack itself does not change materially since the 232 layer is already at 50 percent on aluminum content. What changes: (1) tighter enforcement of the affidavit-or-default rule, (2) explicit smelt-and-cast fields on entry summary, (3) formal derivative annex placement which may open a Chapter 99 heading for line-item transparency on CBP Form 7501.
Post-inclusion total duty: same 324,822 USD in the well-documented case. In the default case where an importer files without affidavit or smelt/cast fields, CBP may apply 50 percent to full invoice under the June 2025 tightening, but for aluminum powder at nearly 100 percent aluminum content the affidavit case and default case converge.
The bigger commercial delta is from alternative sourcing.
Alternative sourcing math
Canada under USMCA. If the aluminum was smelted in Canada or the US and cast in Canada or the US, Section 232 does not apply on the US or Canadian-smelt content share. Canadian smelters include Alouette (Sept-Iles Quebec), Rio Tinto (Kitimat BC, Alma Quebec, Laterrière Quebec), Alcoa Deschambault Quebec, Alcoa Baie-Comeau Quebec. USMCA-qualifying aluminum powder from Canada with Canadian smelt origin: 350k CIF, MFN 0 percent under USMCA, S232 0 percent on Canadian smelt share, S301 not applicable. Total duty roughly 1,072 USD (MPF and HMF only). Landed cost delta: 323,750 USD savings versus Chinese origin.
UK under June 2025 EPD. UK aluminum smelters include Lochaber (Fort William, Scotland) operated by GFG. UK-origin aluminum powder pays 232 at 25 percent under the EPD arrangement instead of 50 percent general. 350k CIF UK origin: MFN 5 percent (17,500) plus S232 25 percent on aluminum content (87,500) plus MPF and HMF. Total duty roughly 106,072 USD. Landed cost delta: 218,750 USD savings versus Chinese origin.
US domestic. Valimet (Stockton CA, gas-atomized spherical powder), Ampal (Palmerton PA, atomized non-lamellar), Toyal America (Naperville IL, lamellar pigment), Silberline (Tamaqua PA, lamellar pigment for coatings), Eckart Effect Pigments (Painesville OH, lamellar). Domestic pricing is typically 20 to 40 percent higher per kg than Chinese landed cost pre-232 but competitive or lower post-232 stack.
For readers modeling the aluminum stack against USMCA and UK alternatives, our Section 232 aluminum 50 percent calculator supports smelt origin, cast origin, and country arrangement inputs to run the comparison side by side.
What aluminum powder importers should do before Aug 27
Three actions this week.
One. If you import HS 7603.10 or 7603.20, file a substantive comment on regulations.gov before 11:59 PM ET Aug 27. Include actual entry volume, current landed cost, projected post-inclusion cost, and the qualification cycle for alternative sourcing. Aerospace and medical additive manufacturing buyers should attach the FAA or FDA qualification memo showing why substitution takes 6 to 12 months.
Two. Get producer affidavits and smelt-and-cast certifications on standing POs now. Even under the current chapter 76 sweep, the affidavit-or-default rule tightened in June 2025. Post-inclusion enforcement is expected to be strict.
Three. Get quotes from Canadian, UK, and US domestic suppliers with lead times. If the qualification cycle is 6 to 12 months, the decision to start is today, not on the effective date.
The 93 percent effective duty rate on Chinese-origin aluminum powder is not a scenario to plan around. It is the current reality. The comment window is a chance to shape the annex language and Chapter 99 assignment mechanics before they lock in.
Frequently asked questions
What HS subheadings does aluminum powder fall under?
Aluminum powder is classified under HS 7603 (Chapter 76, aluminum and articles thereof). Two 6-digit subheadings: 7603.10 covers non-lamellar powder (spherical, atomized, or irregular particles used as feedstock or pigment base), 7603.20 covers lamellar powder and flakes (flat-shaped particles used primarily in metallic pigment for paint and coating applications). US 8-digit statistical breakouts: 7603.10.00 aluminum powders of non-lamellar structure, 7603.20.00 aluminum powders of lamellar structure and aluminum flakes.
Who imports aluminum powder into the US?
Five main buyer categories: (1) pigment and paint manufacturers using lamellar powder for metallic finish coatings (auto refinish, industrial coatings, decorative paint), (2) refractory brick producers using non-lamellar powder as binder or filler in high-temperature bricks for steel and glass furnaces, (3) thermite for rail welding and cutting, using coarse non-lamellar powder mixed with iron oxide, (4) pyrotechnics and defense articles (fireworks, flash powder, propellants) using fine non-lamellar or lamellar grades, (5) metal additive manufacturing (3D printing) using gas-atomized spherical non-lamellar powder for laser powder bed fusion (LPBF), directed energy deposition, and binder jetting of AlSi10Mg, 6061, 7075, and other aluminum alloys.
What is the current MFN duty rate on HS 7603?
HS 7603.10.00 non-lamellar aluminum powder: MFN column 1 duty 5 percent ad valorem. HS 7603.20.00 lamellar aluminum powder and flakes: MFN column 1 duty 3.9 percent ad valorem. Both classifications currently pay Section 301 List 3 at 25 percent for China origin, plus Section 301 forced-labor tier A at 12.5 percent (for China origin under 9903.05.37 effective July 24 2026). Both currently pay Section 232 at 50 percent on the aluminum content share (which is close to 100 percent for pure aluminum powder) but the derivative rule application on 7603 as of Aug 18 2026 is via the broad chapter 76 sweep, not the specific derivative annex.
What is the projected duty stack if aluminum powder is added under the Aug 27 comment window proposal?
The Aug 6 Federal Register notice (2026-15961) is proposing explicit inclusion of aluminum powder in the derivative annex under a new HTSUS Chapter 99 subheading. Once effective, the 232 layer at 50 percent general (25 percent UK) would apply with an explicit smelt-and-cast reporting requirement on entry, matching the July 10 2025 aluminum smelt-and-cast rule. Post-inclusion stack for a Chinese-origin 350,000 USD CIF shipment of HS 7603.10.00: 5 percent MFN (17,500) plus 50 percent S232 on full aluminum content (175,000) plus 25 percent S301 List 3 (87,500) plus 12.5 percent S301 forced-labor tier A (43,750) plus MPF cap (634.62) plus HMF (437.50), total duty 324,822 USD or 93 percent effective rate on CIF.
What alternative sourcing options exist for post-inclusion pricing relief?
Three real options: (1) Canada under USMCA if the aluminum was smelted in Canada or the US and cast in Canada or the US, in which case Section 232 does not apply on the US-content share and the USMCA rate applies to the non-metal content, (2) UK at 25 percent under the June 2025 EPD arrangement if the aluminum was smelted in the UK, (3) domestic US suppliers if capacity exists (Toyal America, Valimet, Ampal, and others produce non-lamellar and gas-atomized powder domestically, and lamellar pigment powder is produced by Silberline and Eckart US). Non-covered feedstock reroutes are limited: aluminum powder is a chapter 76 primary form and does not have obvious upstream alternatives that avoid the 232 sweep entirely.
What is the impact on the additive manufacturing (metal 3D printing) supply chain specifically?
Gas-atomized aluminum powder for LPBF is a specialty grade with limited domestic capacity. Major foreign suppliers include LPW (UK, part of Carpenter Additive), EOS (Germany), TLS (Germany), Sandvik (Sweden), Constellium (France), Toyal (Japan), Fujian Ansda (China). Post-inclusion pricing for a Chinese supplier at 93 percent effective duty pushes AlSi10Mg powder from roughly 40 USD per kg to 77 USD per kg landed. UK and EU suppliers at 25 percent (UK) or 50 percent (EU without a specific arrangement) become more competitive. US suppliers (Valimet, Ampal, Novel Powders) become the default for aerospace and defense qualifications where China origin was already restricted. Expect qualification cycles of 6 to 12 months to swap the powder in a certified aerospace or medical application.
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