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Evaluation of iron-aluminium oxide pigments
The pigments prepared were evaluated in comparison with red iron oxide according to standard methods. The characteristics of the pigments evaluated are summarised in Table I.

From Table I, it is clear that:
1 the pigments prepared showed higher values of oil absorption, lower specific gravity values and higher bulking values than red iron oxide;
2 oil absorption showed the lowest value for the pigment containing 3Fe2O3: 1Al2O3 and as the alumina percentage in the pigment increased, oil absorption also increased, this may be due to that alumina particles were so fine and light, i.e. need more oil;
3 specific gravity values were high for pigments containing 3Fe2O3: 1Al2O3, since iron is a heavy element, but as the percentage of alumina increased in the pigment, specific gravity showed lower values;
4 water-soluble matter was so low in the prepared pigments, but it increased with the increase of alumina; and
5 hydrogen ion concentration was alkaline.

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