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Nearly all paint films of Group 3 had high impact resistance.
The above observations revealed that as the concentration
of alumina in the pigment composition increased, the hardness of the resulting paint film increased. In other words, the presence of alumina improved hardness. Also, better results of impact resistance and ductility were found in paint films where the pigments contained higher levels of iron. This is logical as iron is considered one of the hard elements in Moh’s scale. The presence of alumina with iron improved the physico-mechanical properties of the resulting paint films,
as compared to each individual one alone.
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