Market overview

Diphenyliodonium hexafluorophosphate (CAS 58109-40-3) is the simplest commercial diaryliodonium salt and a widely used cationic and hybrid photoinitiator. It drives cationic polymerisation of epoxides and vinyl ethers, acts as an electron acceptor in visible-light and dye-sensitised radical systems (including dental and 3D-printing resins), and serves as a PAG in research lithography. Because it is shared across curing, dental, additive manufacturing and electronics uses, pricing ranges from catalogue to bulk industrial grades, and the report separates those tiers clearly.

Key figures at a glance
– Cationic photoinitiator market: USD 0.40 bn (2025) to USD 0.72 bn by 2034, 6.8% CAGR; iodonium salts 38.2% share, growing at 7.4% CAGR (Marketintelo)
– Photoacid generator (PAG) market: USD 2.69 bn in 2025 to USD 4.95 bn by 2034 at 7.0% CAGR; onium salts 61.7% of value; EUV-linked demand growing at 14.2% CAGR (Straits Research)

Recent developments among key stakeholders
– Nov 2025: Tokyo Ohka Kogyo (TOK) plans a ~JPY 20 bn photoresist plant in South Korea (operations 2030) to lift Korean capacity 3-4x for Samsung and SK hynix; JSR is building an EUV metal-oxide resist facility in Korea for end-2026; Adeka is investing JPY 3.2 bn in metal-oxide resist components (from April 2028) (TrendForce, citing Nikkei)
– Dec 2025: Reports that Japanese suppliers paused some ArF resist shipments to Chinese fabs; China is targeting about 40% resist self-sufficiency by 2026, up from about 10% in 2024 (TrendForce)
– 2019-2020: IGM Resins built a photoinitiator plant at Anqing, China, with over 10,000 t of finished-product capacity and expanded its Mortara (Italy) site by 25%, increasing Chinese supply of curing initiators (PCI Magazine)

What this means for the market
Curing-grade sulfonium salts face Chinese capacity and price pressure, while electronics grades benefit from resist localisation. The report separates these two markets and their price trends.

How published estimates compare
Marketintelo’s iodonium segment (38.2% of USD 0.40 bn, roughly USD 150 mn in 2025) is the most relevant published anchor for this molecule; it covers all diaryliodonium salts, of which diphenyliodonium PF6 is one. Broad PAG totals of USD 2.7 to 3.1 bn are not applicable. Market Krystal sizes demand separately for curing, dental/3D printing and electronics, using formulation volumes and initiator loadings.

What this report delivers
Annual volume (tonnes) and value (USD) for 2026-2035, segmented by application: cationic UV curing, dental composites, 3D printing, photoresists, visible-light photoredox; grade: industrial, high-purity, research; region: Asia-Pacific, North America, Europe. Each segment is backed by a producer capacity table, price benchmarks for 2020-2025 by grade and region, trade-flow analysis and a supplier risk map. Companies assessed include IGM Resins, San-Apro, Changzhou Tronly, Tokyo Chemical Industry, Merck KGaA (Sigma-Aldrich), FUJIFILM Wako, Lambson. The 2036-2047 outlook uses three explicit scenarios (base, constrained supply and technology transition) rather than a single extrapolated curve.

Methodology and transparency
Every third-party figure in this report is cited to its source. Market Krystal estimates are labelled as such, with the volume, price and share assumptions behind them shown in the supporting Excel model, so buyers can audit and adjust them. Where public sources conflict, the report shows the range and explains which evidence it relies on.

The purchased delivery includes the PDF report, Excel datasets and customization around the buyer’s priority region, company set, application or commercial question.

What this research answers

The study connects production routes, named suppliers, applications, regional demand, trade, pricing drivers and commercial opportunities for this CAS number. Detailed estimates and company analysis remain inside the purchased report.