# Samsung denies Chinese tool testing as US tightens fab controls *South Korean memory makers face annual US export reviews for their Chinese fabs as Washington curbs equipment servicing and pushes foreign lines toward local alternatives.* **Published:** September 6, 2026 **By:** Ji-woo Han **Section:** Semiconductors & AI Hardware — South Korea **Format:** Policy Tracker **Confidence:** high **Source:** https://eastasiabrief.com/semiconductors/samsung-denies-chinese-tool-testing-us-tightens-fab-controls-195 **Publisher:** East Asia Brief (https://eastasiabrief.com/) --- ## What to know - The South Korean company operates a NAND flash manufacturing complex in Xi'an that generates 40% of its total flash output. ![A technician in a protective cleanroom suit operates machinery inside a semiconductor fabrication facility. (AI-generated image)](https://eastasiabrief.com/media/2026-09-06-98daf1f7ed1d.webp) *A technician in a protective cleanroom suit operates machinery inside a semiconductor fabrication facility. (AI-generated image)* Samsung Electronics rejected market claims Sept. 5 that it is qualifying domestic Chinese equipment for its memory fabs, countering reports that South Korean chipmakers are turning to local vendors under tighter American export controls. The South Korean company operates a NAND flash manufacturing complex in Xi'an that generates 40% of its total flash output. Peer SK hynix produces 45% of its DRAM memory in Wuxi. Unverified industry reports circulated Sept. 5 alleging that both Korean memory makers began qualifying Chinese etching systems. The accounts asserted that fab managers sought local tools after American regulatory exemptions expired. Samsung Electronics reiterated Sept. 5 that it has not evaluated equipment from Chinese suppliers for deployment in its Xi'an facility. The company had previously issued a formal denial following similar reports in August. SK hynix declined to comment on vendor evaluations across its Chinese production sites. The company operates a DRAM fab in Wuxi and an acquired NAND flash fabrication facility in Dalian. Neither company has submitted regulatory filings indicating commercial purchase contracts with Chinese semiconductor equipment makers. Exchange disclosures in Seoul show both firms continue sourcing fab tooling under authorized export frameworks. Market speculation intensified after the US Department of Commerce restructured export rules governing foreign-owned cleanrooms in China. The revisions ended open-ended equipment exemptions that had shielded Korean chipmakers from individual license filings. The Bureau of Industry and Security designated the Xi'an and Wuxi plants as Validated End-Users on Oct. 13, 2023. That status allowed both companies to import designated American equipment without seeking case-by-case licenses. Under Secretary of Commerce Alan Estevez stated in October 2023 that the authorizations supported transparent supply chains. The measure permitted Korean producers to sustain established cleanroom lines while maintaining compliance with American rules. The commerce department reversed that policy on Aug. 29, 2025, revoking the general authorization for foreign fabs. Commerce officials stated that the change closed regulatory exemptions that placed American-owned factories at a competitive disadvantage. The revocation established a 120-day transition period that ended on Dec. 31, 2025. Former participants had to apply for specific export authorizations to continue receiving Western tools and replacement parts. The Bureau of Industry and Security revised the mechanism on Dec. 30, 2025, issuing annual authorizations covering equipment shipments through 2026. The shift replaced open-ended status with yearly reviews of factory intake. Under the annual authorization framework, Washington permits equipment imports required to maintain operational yields at existing facilities. The agency prohibits shipments intended to expand wafer capacity or introduce advanced manufacturing nodes. The shift created operating friction for American tool vendors that dominate memory processing lines. Applied Materials, Lam Research and KLA supply the majority of etching, chemical vapor deposition and metrology equipment in both plants. China represented $8.53 billion, or 30% of total revenue, for Applied Materials during fiscal 2025. Restrictions on replacement parts and servicing agreements have raised compliance burdens across all three American equipment manufacturers. Restrictions also limit American personnel from servicing installed cleanroom systems. Fab managers face strict license boundaries when ordering replacement components for high-precision tools originally purchased from California-based suppliers. Chinese equipment manufacturers have targeted those maintenance gaps by pitching locally developed alternatives. Shanghai-based Advanced Micro-Fabrication Equipment, known as AMEC, has expanded sales of plasma etching systems across China. AMEC etchers are already deployed on commercial production lines at Yangtze Memory Technologies Corp. That domestic adoption demonstrated tool stability in multilayer NAND manufacturing, drawing interest from global memory analysts. Other Chinese toolmakers have accelerated commercial shipments of fab equipment. Naura Technology Group manufactures etching and cleaning systems, while Piotech supplies chemical vapor deposition tools and ACM Research provides wet-processing equipment. Analysts at Deutsche Bank estimated that Naura, AMEC, Piotech and ACM Research will each generate over $1 billion in 2026 revenue. The four vendors could capture between 25% and 30% of China's $28 billion equipment market. Integrating Chinese tools into advanced Korean production lines presents steep technical barriers. Etching tools carve microscopic channels through dozens of memory layers, requiring nanometer-level precision to prevent electrical leakage. Swapping an established etching tool forces operators to redesign chemical recipes and requalify full production lots. Any variation in etch depth degrades wafer yields, threatening profitability at plants operating at high capacity. South Korea's Ministry of Trade, Industry and Energy has engaged in bilateral talks with American counterparts to stabilize factory operations. Korean officials have requested multi-year visibility to avoid annual supply disruptions. The current annual authorizations for Samsung Electronics and SK hynix expire on Dec. 31, 2026. The US Department of Commerce has not announced licensing terms for equipment shipments entering China in 2027. ## Impact map | Event | Korea | China | Japan | Global impact | | --- | --- | --- | --- | --- | | China fab equipment rules | memory fabs face annual reviews | toolmakers seek replacement share | equipment suppliers watch licensing | memory supply chain compliance | ## In this story - **Companies:** Samsung Electronics, SK hynix - **Tickers:** 005930.KS, 000660.KS - **Exposed:** Applied Materials, Lam Research, KLA, Advanced Micro-Fabrication Equipment - **Policy:** Export Controls - **Impact:** Supply Chain, Compliance, Capex ## Primary sources 1. bis.gov 2. kosti.or.kr 3. aitimes.com 4. news1.kr 5. economytribune.co.kr --- Cite as: East Asia Brief, "Samsung denies Chinese tool testing as US tightens fab controls," September 6, 2026. https://eastasiabrief.com/semiconductors/samsung-denies-chinese-tool-testing-us-tightens-fab-controls-195