Nordkalk Oy Ab is a Finnish industrial minerals company specializing in limestone-based products. Headquartered in Parainen (Pargas), Finland, it operates across Northern and Central Europe. The company extracts and processes limestone into quicklime (CaO), hydrated lime (Ca(OH)₂), and various limestone aggregates and powders, including ground calcium carbonate for industrial use.
Nordkalk’s materials are used in steel and metals production, pulp and paper, construction materials, agriculture, and the chemical industry, as well as in environmental applications such as flue-gas desulfurization and water and wastewater treatment. The company focuses on applications that require pH control, purification, and mineral fillers. Nordkalk has been part of SigmaRoc plc since 2021.
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Methane cracking to supply low‑carbon hydrogen and solid carbon for EAF-based steelmaking; three‑year research project starts June 2026 with university and industry partners.
