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TU podcast: Interview with Caox AS
Making paint and paper filler from CO₂
November 6, 2025
CCUS
Norwegian company Caox AS uses captured CO₂ to produce calcium carbonate – a filler material used in products such as paint and paper.
In this episode of Teknisk Sett podcast, Tech Editor Jan Moberg from Teknisk Ukeblad speaks with Caox CEO Ole Jacob Sandal, who explains how the company uses captured carbon to produce an important ingredient for industry.
Listen to the TU Podcast interview with Caox AS here (in Norwegian)
The article below is a translation from Moberg's article.
Carbon capture and storage is a hot topic, and Norway is at the forefront of the field.
The Stavanger-based company Caox AS specializes in using captured CO₂ to produce an important input material for manufacturing products like paint and paper.
— We mineralize carbon – essentially the same process that occurs when sea urchins form their shells. That takes 55 days. Our process, however, is much faster — yes, it happens in seconds, explains Ole Jacob Sandal, the company’s CEO.
Calcium carbonate (CaCO₃), also known as chalk, is a white, solid substance found in materials such as limestone and eggshells. It’s also a key filler and ingredient in many industrial processes. Caox does not mine limestone but has developed a process based on producing calcium carbonate from already captured carbon. As indicated by the chemical formula, calcium is also required.
The company aims for the resulting material to be used by industries that require calcium carbonate as an ingredient. In addition to the areas mentioned, it’s also used in the production of plastics, food, beer, and pharmaceuticals.
On-site factories
So far, the company’s efforts have led to an agreement with Aramco in Saudi Arabia. One of the major opportunities with this technology is to establish processing plants at sites where carbon is already being captured — and where there is also a need to use calcium carbonate on-site
For example, paper mills emit CO₂, produce fly ash rich in calcium, and require large amounts of calcium carbonate in their production.
In this week’s podcast, you can hear the Caox CEO talk about the company’s progress, their plans for a pilot plant, and production starting next year.
