prov:value
| - Exemplary materials which may find use are polysaccharides, e.g. cellulosic materials, such as paper, cellulose acetate, nitrocellulose, and backed nitrocellulose; inorganic materials, such as silica, deactivated alumina, diatomaceous earth, MgSO4 or other inorganic finely divided material substantially uniformly dispersed in a porous polymer matrix, with polymers such as vinyl chloride, vinyl chl
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