Magnesite specialists

The Portolos family got into the exciting business of mining in 1914. True to the family legacy and ever eager to excel, the company prioritized R&D and managed to develop products for practically all magnesite applications known to date.

As the magnesite specialists we proudly are, we offer a wide range of application-specific grades of Caustic Calcined Magnesia, Deadburned (Sintered) Magnesia, Magnesium Carbonate (Natural Raw Magnesite), Basic Monolithic Refractories & Dunite (Natural Magnesium Silicate) for a host-lot of industries; from iron & steel, mining & metallurgy to manufacturing, construction, and the environment.

Our expertise and meticulous attention result in products, which lead their field in the consistency of their chemical and physical properties. Quality of products and integrity of our operations have paid off in customer satisfaction and a leading position in international markets.