Made from high-quality limestone, this ultra-high-purity calcium carbonate was developed using our proprietary technology that combines the advantages of conventional carbonation and solute reaction techniques. It has a purity of over 99.9% and features extremely low alkali metal content. We have also successfully reduced the strontium content, a component typically challenging to separate from calcium. We offer six grades based on purity and particle size, according to customer requirements: 3N-A30, 3N-A, 3N-B, 3N-C, 3N-D, and 4N-D.