Abstract
Gypsum was set on polyethylene foil of different origin and on cellophane foil. Experiments were also carried out in an electric field (5-25 kV direct-current). In all cases (especially in the electric field) (010) textures developed on the contact surfaces and were overlapped by a (121) texture. Brinell hardness tests show a greater hardness of the contact areas than those of the upper sides of the samples. Those samples set in an electric field yielded, partly, greater differences. The values, however, diverge greatly.