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SK Hynix Ramps M15X Into Japan's Photoresist Crunch
Japan's naphtha market spent two years declining before the Hormuz blockade nearly doubled prices in five weeks. South Korean chipmakers hold roughly six months of photoresist safety stock; SK hynix is ramping a megafab precisely when that buffer expires.
SK hynix's $15 billion M15X megafab began trial production in May, the same month Japanese photoresist suppliers warned South Korean chipmakers their naphtha supply was failing.
Naphtha, refined into propylene and on into PGME and PGMEA, governs how photoresist flows onto a wafer and strips clean after exposure. Japan sources roughly 40% of its naphtha through the Strait of Hormuz, effectively closed since February 28.
Japan C&F naphtha averaged roughly $675 a ton through 2024, fell to $568 by Q4 2025, and settled at $622.58 on February 27. No supply crunch had preceded it. By early April the contract hit $1,190, nearly doubling in five weeks, and pulled back to $908 by May 19, still 46% above the pre-blockade close.
Three Japanese firms hold the EUV photoresist market in near-total concentration. Tokyo Ohka Kogyo, JSR, and Shin-Etsu Chemical collectively supply more than 90% of EUV-grade resist, the chemistry that makes 3nm and 2nm production possible. All three draw inputs from the same naphtha supply chain.
Shin-Etsu, Japan's largest chemical company by market cap, pulled its full-year earnings guidance in April. Its most recent quarterly operating profit came in at $860 million, down 13% year on year.
The Six-Month Clock
Samsung Electronics and SK hynix hold roughly six months of photoresist safety stock, according to Morningstar analyst Phelix Lee. Count from March, and that buffer reaches roughly September.
South Korea carries the sharpest exposure. SK hynix runs six EUV layers on its current 1c DRAM, more resist per wafer than Samsung's equivalent process. Samsung, meanwhile, is exploring dry photoresist for its next-generation memory, a chemistry that sidesteps PGMEA entirely.
TSMC partly offset its Japan exposure through a localization program that had Taiwanese suppliers producing over NT$1 billion in annual photoresist output by 2024. Samsung and SK hynix built no equivalent domestic supply.
Any change to solvent source or concentration triggers a requalification cycle at advanced nodes running twelve months or longer. Six months of stock. Twelve months to certify a replacement.
The Twelve-Month Gap
The M15X timeline exposes SK hynix as the longest wait in the photoresist order book. New-fab resist orders, placed months ago for production now under way, cannot be rerouted to an alternative supplier within the six-month window.
JSR, nationalized by Japan Investment Corporation for roughly $6.4 billion in 2024, is commissioning a resist plant in Cheongju, South Korea, for mass production in 2026. The Cheongju plant makes metal-oxide resist, a tin-based chemistry designed to replace conventional CAR at future nodes. Deploying it on SK hynix's current 1c DRAM lines requires a fresh requalification cycle running twelve months or longer.
JSR also announced a Taiwan joint venture with Wah Lee Industrial and LCY Chemical in Yunlin County in April, aimed at TSMC's sub-2nm resist supply and targeting 2028. The Korean crunch runs two years ahead of it.
Shin-Etsu's quarterly release, expected in late July, is the first hard signal on whether the CAR supply chain has found an alternative solvent path. If guidance remains blank, M15X will be five months into the safety-stock window with no qualified CAR substitute. The metal-oxide resist Cheongju plans to supply faces a minimum 12-month qualification run before it displaces any wafers at SK hynix.