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$SK Hynix(SKHY.US) Stacking over a dozen memory dies and then bonding them, SK hynix can finish the job in one shot. Samsung and Micron have to press and bond layer by layer.

Its proprietary bonding process is one of SK hynix's key competitive edges.

SK hynix uses MR-MUF: align all layers once, complete bonding in a single pass, then fill gaps with resin. Samsung and Micron use TC-NCF, bonding each layer through repeated heat and pressure.

The toolsets are fundamentally different.

Two gaps stand out. One-shot bonding reduces steps, boosting efficiency and yield, while layer-by-layer bonding means one defect can scrap the entire stack.

Repeated thermal compression also warps and cracks ultra-thin wafers more easily, pushing yields even lower.

This flows straight to GPM, giving SK hynix a structural edge.

So why don't Samsung and Micron just copy it?

First, SK hynix has locked up the process and key liquid resin materials with patents. Second, Samsung and Micron have sunk heavy capex into the TC route, making a pivot costly.

So they are effectively skipping this generation and betting on next-gen 'hybrid bonding' to leapfrog.

A bonding process itself is a ready-made moat. Bonding technology will be a hidden line separating winners from laggards among memory makers going forward.

Samsung and Micron appear more inclined to develop next-gen hybrid bonding directly to attempt a leap. $SKHY 2X Short ETF(SKDD.US) $T-REX 2X Long SKHY Daily Target ETF(HYNX.US) $SKHY 2X Long ETF(SKHX.US)