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sand is critical to flat glass manufacturing since it is the principal source of silicon dioxide (sio ) which is essential for producing glass [ ] . a high proportion of silica in the sand composition (above %) is therefore required together with a high level of chemical purity. this quality of raw materials...
publications bioavailability study links contact specific minerals specific mineralmaterials obtain their effect primarily from their inner geometric structure. the chemical composition is of secondary importance even if it is of course closely linked to the characteristics of the material. an extraordinary...
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