Iron Sulfate (Ferrous Sulfate)

American titanium dioxide (TiO2) manufacturer (NYSE: KRO, HQ Dallas TX; Contran Corporation/Harold Simmons family ~85% ownership; ~$1.8B revenue); operates TiO2 plants in the US (Savannah GA, Hamilton Mississippi), Germany (Leverkusen, Uerdingen), Belgium (Langerbrugge), and Norway (Fredrikstad) using the sulfate process. The sulfate process for TiO2 production generates large volumes of ferrous sulfate (FeSO4·7H2O, 'copperas') as an unavoidable byproduct — for every tonne of TiO2 produced via sulfate process, approximately 4-6 tonnes of ferrous sulfate are generated. Kronos purifies and sells food-grade ferrous sulfate to pharmaceutical and infant formula manufacturers. This creates a remarkable supply chain relationship: the iron supplement in infant formula is a byproduct of making white paint pigment (TiO2 is the primary white pigment in all white paints). When Kronos's TiO2 production is curtailed (construction downturn, housing slump), ferrous sulfate supply to infant formula manufacturers falls in lockstep, regardless of infant formula demand. TiO2 and infant iron nutrition share the same production bottleneck.

British titanium dioxide and performance additives company (formerly Huntsman TiO2 division, spun off 2017, NYSE: VNTR; HQ Stockton-on-Tees UK; restructured through Chapter 11 bankruptcy 2023); produces TiO2 via both sulfate and chloride processes, with sulfate-process plants in the UK (Grimsby), Germany (Duisburg), Finland (Pori), and South Africa generating ferrous sulfate byproduct. Venator filed for Chapter 11 bankruptcy in 2023 due to competitive pressures from Chinese TiO2 producers and a major fire at its Pori Finland plant in 2017 (which had 70% of Venator's production capacity) that took years to recover from. Venator's bankruptcy and restructuring reduced a significant source of European ferrous sulfate supply for infant formula and agricultural markets — illustrating that the iron supplement in infant formula can be supply-constrained by a factory fire in Pori, Finland and a Chinese competitive threat in white paint pigment.

Lanxess AG (Cologne, Germany; MDAX: LXS; ~€6.7B revenue) is the world's largest EPDM producer through its Keltan brand, holding an estimated 30-35% of global EPDM capacity. Acquired the EPDM business of DSM Elastomers in 2011 in a joint venture with Saudi Aramco (branded Arlanxeo), which was later unwound — Lanxess retaining the Keltan brand. Primary EPDM production at the Chemelot industrial site in Geleen, Netherlands (the former DSM Elastomers facility, one of the world's largest EPDM plants). Keltan EPDM is the benchmark product for automotive radiator hoses, door seals, roofing membranes, and plumbing O-rings and gaskets globally. Lanxess also produces synthetic rubber (butyl, HNBR) and specialty chemicals. Keltan product grades span broad Mooney viscosity and ENB (ethylidene norbornene) diene content ranges, making it versatile across plumbing, automotive, and construction end markets.