Why Semiconductor Manufacturing Cannot Simply Eliminate PFAS
Modern semiconductor fabrication—producing the chips that power smartphones, electric vehicles, AI servers, and medical devices—is chemically inseparable from fluorochemistry. PFAS are used in photoresist systems for extreme ultraviolet (EUV) lithography, in wet chemical etching processes, as cleaning solvents for photomask maintenance, in chemical mechanical planarization (CMP) slurries, and as process fluids in immersion lithography cooling systems. The semiconductor industry’s essential use case for PFAS is among the most technically justified—and regulators worldwide are treating it as a priority exemption category in PFAS restriction frameworks.
PFAS Use Categories in Semiconductor Fabs
Photolithography: Perfluorosulfonic acid photoacid generators (PAGs) and fluorinated polymers in photoresists are fundamental to achieving the sub-10nm feature sizes required for advanced logic chips. No commercially available non-fluorinated alternatives exist for EUV photoresist applications. Etch chemistry: HF (hydrofluoric acid) etching is not itself a PFAS, but PFAS-based surfactants and etch stop layers are used throughout the fab process. Cleaning: Hydrofluoroether solvents (HFEs) such as 3M Novec and similar products are used for precision cleaning of optical components and photomasks—these are not PFAS by EU definition but face related regulatory scrutiny. Process fluids: Perfluorocarbon and perfluoropolyether fluids are used as heat transfer and inert process media throughout fabs.
ECHA Restriction Exemptions for Semiconductors
The EU PFAS universal restriction proposal includes explicit provisions for semiconductor manufacturing applications, recognizing the absence of technical alternatives and the strategic importance of European semiconductor production under the EU Chips Act. SEMI (the global semiconductor industry association) submitted a detailed dossier to ECHA quantifying PFAS volumes used in European semiconductor manufacturing (~850 metric tons/year) and arguing for a time-limited derogation pending development of alternatives. ECHA’s RAC is expected to recommend an extended derogation period—potentially 12–18 years for some semiconductor applications—while mandating R&D toward alternatives.
Semiconductor Fab Wastewater and Environmental Impact
Semiconductor fabs are significant point sources of PFAS in wastewater. Studies near fab clusters in Taiwan, South Korea, Japan, and the US Silicon Valley region find elevated PFAS in surface waters and sediments adjacent to manufacturing facilities. Taiwan’s EPA and South Korea’s Ministry of Environment have begun requiring PFAS effluent monitoring for semiconductor and display manufacturers. TSMC, Samsung, and Intel have all initiated internal PFAS management programs, aiming to reduce PFAS emissions per unit of production as part of ESG reporting commitments. On-site PFAS treatment using GAC and high-pressure membranes is being deployed at leading fabs, but the complex mixture of PFAS and co-solvents in fab wastewater creates treatment challenges distinct from drinking water applications.
Supply Chain PFAS Risk for OEM Filter Manufacturers
Semiconductor PFAS regulation has supply chain implications for filter manufacturers. Fluoropolymer filter membranes—PVDF, PTFE, and PES membranes used extensively in semiconductor ultrapure water systems—are themselves fluoropolymers potentially subject to PFAS restrictions. While fluoropolymers are generally excluded from the EU restriction proposal’s scope (they are polymers, not small-molecule PFAS), regulatory uncertainty has driven semiconductor customers to request PFAS content declarations from membrane suppliers. Filter manufacturers should prepare material composition declarations for semiconductor customers as this due diligence requirement becomes standard procurement practice.
The semiconductor industry’s PFAS challenge illustrates the complexity of class-wide restrictions for chemicals with genuinely irreplaceable applications—requiring nuanced regulatory design that distinguishes between essential and non-essential uses.