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Telephone numbers in the industrial park


35 56 41 00


032 47


51 99 00 00


065 00


35 57 33 00


22 53 81 00


35 00 60 00

RHI Magnesita:

480 99 500


24 15 70 00

Main Reception

35 92 65 02

Research Park

35 92 65 65

Herøya Industripark AS

35 92 65 00

RHI Magnesita

RHI Normag AS produces various types of magnesium oxide which is useful in most applications.

The company uses dolomite as a raw material. This is crushed and then calcined at 1000 degrees in the company’s calcining tower.

In the next process stage, magnesium hydroxide is precipitated using seawater. This then continues to filtration, where the water is removed, and the product is then calcined at a moderate temperature in a rotary kiln. This results in magnesium oxide, MgO, which is used for many things. RHI Normag AS currently supplies MgO to players working in the fields of agriculture, the paper industry, the rubber industry, coal-fired power stations and other chemical industries.

RHI also have a new factory that produces fused magnesia, which is melted and crystallised magnesium oxide. This process produces one of the most heat resistant materials in the world, which is a raw material used in RHI’s production of refractory bricks.

In full operation RHI Normag AS will produce around 80 000 tonnes MgO per year. RHI Normag AS will also be a supplier of raw materials within the RHI Magnesita group, but this volume will also meet the demand among external customers.

RHI Normag AS is owned by the world's largest manufacturer of refractory masonry, RHI Magnesita.


+47 480 99 500


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