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HSChapter 84
U.S. exports of producer gas, water gas, acetylene gas, and similar water-process gas generators (HS 840510) totaled $4.7M in July 2026.
Importers of Producer Gas, Water Gas, Acetylene Gas, and Similar Water-Process Gas Generators paid $70K in duties in July 2026 — an effective duty rate of 11% on $631K in dutiable value, based on actual customs collections rather than the published tariff schedule. Producer Gas, Water Gas, Acetylene Gas, and Similar Water-Process Gas Generators imports of $1.8M in July 2026 ran 16% above the year-to-date monthly average of $1.5M.
Last updated: July 2026 dataProducer gas and water gas generators convert solid or liquid fuels into combustible gas streams through partial oxidation or steam reforming, while acetylene generators produce acetylene via the reaction of calcium carbide with water — all classified together under 8405100000. Italy and the United Kingdom are the leading US suppliers, reflecting European industrial gas equipment manufacturing strength. These generators serve metallurgical, chemical, and energy applications, and importers should confirm whether the specific generator type triggers any EPA or OSHA process-safety reporting obligations upon installation.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
40 shipments/mo
No. HTS 8405100000 covers the generator apparatus itself — the equipment that produces acetylene by reacting calcium carbide with water. Pre-filled acetylene cylinders and compressed gas supply systems are classified elsewhere (typically under heading 2804 for the gas itself, or 7311 for the cylinders). Only the generating equipment falls under heading 8405.
Heading 8405 covers generators that produce combustible gas through water-based processes (steam-carbon or steam-iron reactions) at relatively modest scales, traditionally for industrial fuel gas supply. Large-scale industrial steam methane reformers used in hydrogen or ammonia production are generally classified under heading 8419 as industrial process equipment. The scale, design intent, and output gas composition are the key distinguishing factors; a binding ruling from CBP is advisable for borderline equipment.
Subheading 1 of 2 in heading 8405
Subheading 840510 · $1.8M of $1.9M
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8405100000 | Producer Gas,Wtr Gas,Acetylene Gas,Wtr Pro Gas Gen | $1.8M | 3.93% | 35.61% | $70K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8405100000 | Prod,Wtr,Acetyl Gas,SIM Wtr Process Gas Generators | $4.7M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$1.8MYoY · Pro
Exports
$4.7MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
customs district
origin
entry
rate provision · imports
64.4% enters free of duty; the effective duty rate is 3.93%.