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Table I. Percentages op inert filler for varying specific gravities
Composition, Wt. Percent Specific Gravities
AlNH4(S04)2∙12H20 Cellulose BaSO4
100     1,64
95 5   1,58
90 10   1,50
90   10 1,71
85   15 1,77
80   20 1,85
75   25 1,95

Source: United States Patent Office 3,375,122 Patented Mar. 26, 1968