Hydrogen semiconductor manufacturing covers four production jobs at once: hydrogen carries and reduces in epitaxy, supplies the atmosphere for high-temperature annealing, tunes the structure of deposited thin films, and scrubs tin debris out of EUV light sources. In Korea that demand is contracted years ahead by fab utility organizations and the industrial gas companies that build plants inside the fence, which decides where a foreign supplier can actually sell.
This page sits under the guide to Korea semiconductor market access and treats hydrogen as a market: what fabs specify, who signs, and what Korean law demands before imported hardware clears customs.
Hydrogen Semiconductor Manufacturing: What Does It Do in the Fab?
Four jobs, at different points on the line with different purity and volume profiles. Air Products’ guidance on ultra-high-purity gases for semiconductor fabrication names all four: hydrogen is the reducing agent and carrier gas in epitaxy, the atmosphere for high-temperature annealing that repairs crystal structure, a modifier of thin film structure in deposition, and the plasma that clears tin debris from EUV light sources.
A fifth job runs separately from that high-temperature anneal. Forming gas annealing, a hydrogen and nitrogen mixture, passivates dangling bonds at the silicon and silicon dioxide interface. It runs cool, conventionally 350 to 450 degrees Celsius and commonly 400 to 450, because the back end of line thermal budget protecting copper and low-k interconnects sets the ceiling. Above that window the passivation reverses: Okuyama and colleagues, in the Japanese Journal of Applied Physics in 2020, record interface state density rising as hydrogen dissociates from the interface, predominantly at 500 degrees Celsius and above.
How Much Hydrogen Does a Leading-Edge Fab Consume?
Enough that supply arrives by pipeline or an on-site plant, with cylinders left to laboratory duty. Writing in Solid State Technology, now Semiconductor Digest, in March 2018, Paul Stockman of Linde Electronics put leading-edge consumption at several normal cubic meters per wafer processed, with major fabs drawing hundreds of normal cubic meters per hour. Read those as 2018 figures.
EUV changed the slope. Stockman put EUV tool flows in the hundreds of standard liters per minute against hundreds to thousands of standard cubic centimeters per minute for older applications, and projected that EUV would roughly double total fab hydrogen use. Samsung and SK hynix both run EUV in volume production, so a Pyeongtaek-scale site takes its hydrogen from plant capacity built on site. Inquivix Technologies covers the equipment view in its guide to hydrogen gas supply systems for semiconductor use.
Who Supplies Hydrogen to Samsung’s Fabs?
At Samsung’s Pyeongtaek complex the molecule is contracted to global industrial gas majors under long-term build-own-operate agreements. That statement holds firmly at Pyeongtaek and thins out quickly beyond it.
Linde announced on 29 April 2025 that it would expand ultra-high-purity gas supply to Pyeongtaek, adding an eighth on-site air separation unit from mid-2026 and supplying Samsung with hydrogen from its existing on-site production there. That is the one documented hydrogen case among the three majors. Air Products announced on 29 April 2026 that Samsung had selected it for a further Pyeongtaek fab, with hydrogen among the gases, phased from 2028 through 2030. Air Liquide closed its DIG Airgas acquisition on 13 January 2026, reaching around 900 million euros of Korean sales by its own account.
Ownership of that supply base is more foreign than the fab contracts suggest. Approtium, formerly Deokyang and the largest domestic producer at roughly 40 percent of the Korean hydrogen market as reported by Seoul Economic Daily in December 2025, has been controlled by Macquarie Asset Management’s private equity arm since 3 December 2021, per TheBell, and took the Approtium name in September 2022. TheBell also reported a Macquarie sale process opening in September 2025 and final bids in February 2026, with nothing completed since. Air Products Korea, the number two industrial gas supplier behind Linde Korea, moved the other way: InvestChosun and the Korea Economic Daily reported in early October 2024 that the parent withdrew its sale before final bids, against an asking price in the 5 trillion won range that indicative offers did not reach.
What stays Korean is the molecule and the pipeline. The merchant base is byproduct hydrogen from the Ulsan, Yeosu, and Daesan petrochemical complexes. Deokyang Energen, separated from the same Deokyang business in the November 2020 demerger and independently owned since, purifies it at Yeosu and Gunsan to 99.99 percent, grade 4.0, and above per its 2026 IPO disclosure, and listed on KOSDAQ on 30 January 2026 as Korea’s first IPO of the year, per TheBell.
How Does SK Group Structure Its Industrial Gas Supply?
Through a captive affiliate progressively opened to foreign infrastructure capital. SK Group sources industrial gas through SK Airplus, formerly SK materials Airplus, renamed in December 2024 and held under SK ecoplant, per Dealsite. Its published product line covers nitrogen, oxygen, and argon from air separation units.
Three transactions reshaped that structure, so any description written before 2025 now reads wrong. Gas News reported on 10 August 2022 that SK Airplus had signed a contract the previous day to sell the industrial gas plant serving SK hynix’s M16 fab in Icheon to Brookfield Asset Management, against a twenty-year supply contract. Bloter reported on 14 September 2025 that the SK Airplus board resolved on 10 September to issue 1.3 trillion won of redeemable convertible preferred shares to a Brookfield vehicle, and Numbers reported on 11 September 2025 that the issue runs to 2,262,853 new shares against 6.8 million already outstanding, roughly 33 percent of the existing count and about a quarter of the enlarged one, paid in two tranches on 28 October and 11 December 2025. A spin-off effective 1 November 2025 created SK Aircore, holding the nitrogen and clean dry air supply to SK hynix’s Cheongju M15 lines.
Hydrogen is the gap in that public record. No source joins SK Airplus to hydrogen supply at a named SK hynix site, so SK hynix’s hydrogen arrangement is not publicly disclosed. Treat any hydrogen volume you assign to an SK hynix fab as unverified.
Who Buys Hydrogen Equipment Inside a Korean Fab?
Three parties, and the one that signs is usually not the one you pitch. At Pyeongtaek the molecule is spoken for, so the addressable business is the hardware inside those systems: point-of-use purifiers, trace moisture and oxygen analyzers, high-purity valves and regulators, compact generators, leak detection, and hydrogen recovery equipment.
Samsung Electronics and SK hynix specify, holding the approved vendor list and the qualification. The purchase order usually comes from the engineering house building the utility package, Samsung E&A on the Samsung side and SK ecoplant on the SK side, with ultra-high-purity piping and gas plant integrators such as Hanyang ENG and Sungdo ENG, while the gas major buys only inside its own scope. A plan that pitches only the fab has addressed the party that can say no and skipped the party that signs.
Most of that layer is already spoken for. TEMC CNS’s 2024 annual report, filed on 18 March 2025, states that its subsidiary Cheil ENG competes in gas supply equipment with Wonik Holdings, KC, and Versum Materials HYT. That last name is 버슘머트리얼즈한양기공, a different company from the integrator Hanyang ENG (한양이엔지), and foreign-owned since Air Products became its parent in 1998, passing to Versum in 2016 and to Merck KGaA when Merck completed its acquisition of Versum on 7 October 2019. Today Energy reported in June 2025 that Gastron holds the number one share of Korea’s fixed gas detector market. The opening is narrower, in point-of-use purification and high-end trace analysis, where foreign suppliers such as Entegris and Pall still lead. The affiliate routing that decides which group you approach sits in the Samsung and SK hynix supplier landscape comparison.
What Purity Does Semiconductor-Grade Hydrogen Require?
Grade 5.0 and above out of the plant, tightened toward grade 6.0 and beyond at the tool, with impurity ceilings in parts per billion. Samsung and SK hynix do not publish their hydrogen specifications, so SEMI standards and published plant data are the public proxy, and the binding number arrives in the request for quotation.
SEMI C58, “Specification for Hydrogen,” is the governing document. It replaced SEMI C3.19, the earlier 99.9995 percent standard, in 2005, and SEMI records the current revision, C58-1116, as approved on 31 August 2016. For what a fab-scale source delivers, Linde’s published HYDROPRIME guidance states on-site generation capacities of 300 to 32,000 normal cubic meters per hour at 99.999 percent purity.
Plant purity means little on its own, because the distribution system between plant and tool is where hydrogen picks up moisture, oxygen, and particles. SEMI E49.8 covers the construction practice that protects the specification in transit, and fabs close the remaining gap with point-of-use purification and continuous online analysis. A supplier selling an analyzer or a purifier sells into that gap, where the credible pitch is measured detection limits with reference installations. The ultrapure water semiconductor market in Korea works the same way.
What Does Korean Regulation Require of a Hydrogen Equipment Supplier?
More than most foreign suppliers budget for, and it starts at customs. Three registrations can apply to one shipment, under three different Korean ministries.
The High-Pressure Gas Safety Control Act governs the manufacture and inspection of containers and specified equipment. Article 5-2, 외국용기등의 제조등록, requires anyone manufacturing those items abroad for export to Korea to register before shipping, with re-registration every three years under Enforcement Rule Article 9-2. The Enforcement Decree fixes the scope: cylinders and their valves and safety valves, storage tanks, vehicle-mounted tanks, pressure vessels, toxic gas piping valves, and emergency shutoff devices. The Korea Gas Safety Corporation performs the technical review and factory audit the registration rests on, and each product still faces separate inspection under Article 17.
Electrolyzers and reformers file somewhere else, and reading Article 5-2 as covering them costs months. Water electrolysis and hydrogen extraction equipment are 수소용품 under Article 2 of the Hydrogen Economy Promotion and Hydrogen Safety Management Act, in force from February 2021. Foreign manufacturers register under Article 38, 외국수소용품의 제조등록, on a Korea Gas Safety Corporation technical review and factory audit against the KGS codes for electrolysis and hydrogen extraction equipment, with re-registration every three years under Enforcement Rule Article 27. The high-pressure hydrogen those units make and the vessels holding it stay under the gas act. The 1 October 2025 government reorganisation split the two regimes across ministries: Article 38 as amended that day, read with Enforcement Rule Article 22(2), files the foreign 수소용품 registration with the Minister of Climate, Energy and Environment, while the gas act stays with the industry ministry.
Flammable-gas hardware with electrical parts hits a third gate that foreign suppliers rarely price. Article 84 of the Occupational Safety and Health Act requires safety certification, the KCs mark, and Article 74 of its Enforcement Decree puts explosion-protected electrical machinery and components on the mandatory list. Gas detectors, analyzers, and solenoid and valve electricals sited in a hazardous area fall inside it, and Korea Customs has treated products subject to that safety certification, explosion-protected electrical equipment among them, as a clearance-confirmation category for declarations filed from 1 January 2012, under Korea Customs Service notice 2011-53 of 26 December 2011. ATEX carries no weight in Korea. An IECEx certificate of conformity does, earning a partial exemption from safety certification under Enforcement Rule Article 109(2). That is the largest lever a foreign supplier holds here. The wider certification map is in the guide to technical documentation for Korean fabs.
The planning numbers quoted for the gas registration, eight to twelve months for a first registration and a factory audit of about three days, come from MPR Korea Certification, a consultancy that sells KGS registration services, and not from any official source. These filings run ahead of any fab evaluation, and they sit alongside chemical registration under K-REACH where a substance is involved.
How Does a Foreign Hydrogen Supplier Get Qualified?
Slowly, and mostly on infrastructure someone else owns. Registration clears first, and supplier registration comes before any technical evaluation: Samsung runs 협력회사 등록 through its International Procurement Center and, for the DS semiconductor division, the N-SRM supplier portal that has replaced G-SRM, and SK hynix registers suppliers through gpis.skhynix.com. Technical qualification then follows the stage sequence set out in the guide to the fab qualification process in Korea.
Hydrogen adds a constraint most process chemicals avoid. The loop is a live, flammable utility feeding tools across the fab, so evaluation rarely happens by swapping a component into service. It attaches to a new construction phase, a test skid, or a single tool loop, which ties supplier entry to the Pyeongtaek and Yongin build calendars.
Two commitments belong in the first meeting: a named representative in Korea who answers a Korean-language technical question within days, chosen against the criteria in the guide to selecting a semiconductor distributor in Korea, and a service model sized for a flammable utility, with spares in country and response measured in hours.
Market and regulatory data current as of September 2026; the consumption figures carry their 2018 date.
Frequently Asked Questions
Who supplies hydrogen to Samsung’s Korean fabs? Global industrial gas majors, under long-term on-site contracts. Linde announced in April 2025 that it supplies Pyeongtaek with hydrogen from its existing on-site production there, and Air Products announced in April 2026 that Samsung had selected it for a further Pyeongtaek fab, phased 2028 to 2030. SK hynix’s hydrogen arrangement is not publicly disclosed.
What Korean registration does hydrogen equipment need before import? It depends on the item. Cylinders, storage tanks, pressure vessels, and safety valves fall under Article 5-2 of the High-Pressure Gas Safety Control Act. Water electrolysis and hydrogen extraction equipment are 수소용품 under Article 38 of the Hydrogen Act, a separate route. Both run on three-year re-registration and a Korea Gas Safety Corporation technical review and factory audit.
Does a hydrogen analyzer need explosion-proof certification in Korea? Where it is explosion-protected electrical apparatus for a hazardous area, yes. Article 84 of the Occupational Safety and Health Act requires the KCs mark, and the Enforcement Decree lists explosion-protected electrical machinery and components. ATEX carries no weight on its own. An IECEx certificate of conformity does, earning a partial exemption from safety certification under Enforcement Rule Article 109(2).
Where can a foreign supplier still win in Korean fab hydrogen? In the hardware inside the gas system. The molecule at Pyeongtaek is contracted years ahead to Linde and Air Products. Point-of-use purification and high-end trace analysis remain led by foreign names such as Entegris and Pall, while gas cabinets, valve manifold boxes, and fixed gas detection are held by companies already operating in Korea.
Inquivix Technologies represents global clean-process suppliers inside Korea, covering hydrogen, ozone, and ultrapure water systems; its guide to hydrogen gas generators covers the equipment view. To discuss where your hydrogen technology fits against Korean demand and what Korean approval will cost you in time, contact Joon K Lee at joon@joonklee.com.
