Semiconductor Materials & Consumables
The wafers, gases, slurries, and chemicals consumed every time a chip is made.
What this layer does
For every dollar a fab spends on equipment, it also spends ongoing dollars on materials — silicon wafers, photoresist, etch and deposition gases, CMP slurries, filtration consumables, sputtering targets. These are bought continuously, scale with wafer starts (not capex cycles), and are dominated by a handful of Japanese, Korean, and European chemical companies that have spent decades qualifying with the fabs.
This is the most defensive layer of the silicon column. Lower beta to AI than equipment, but tightly correlated with wafer-out volume — which is what AI demand ultimately drives.
Sub-categories
The base substrate. Five suppliers globally; effective oligopoly.
The light-sensitive coating that makes lithography work. EUV resist is a particularly tight market.
The polishing chemistry used in CMP. Entegris (CMC), Versum/Merck, and Cabot are the key names.
Nitrogen, oxygen, argon, hydrogen, helium — volumes are huge, margins thin, but mission-critical infrastructure on-site at every fab.
Etch and deposition gases — tungsten hexafluoride, NF3, fluorinated specialty molecules. Higher-margin than bulk gases.
Acids, solvents, developers, strippers. Ultra-high-purity chemistry.
Filters, valves, piping, mass-flow controllers. Entegris is the pure-play; high-margin recurring revenue.
Pure-metal targets for PVD deposition — copper, tungsten, titanium, tantalum.