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For sizing and strengthening of paper

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Hydrated silica has very good abrasion resistance and strength. As mentioned above, it is "white", so when it is used in paper, it can increase the whiteness and opacity of the paper and make the paper more abrasion-resistant Oil resistance, better gloss. For example, adding 1-2% fumed silica to the newsprint can reduce the weight of the paper by 10%, increase the strength, and prevent the ink from penetrating.

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