Abstract: An electric insulator including an electric insulation and a semiconducting layer forming on an outermost surface of the insulator that faces the environment surrounding the electric insulator. The semiconducting layer includes a polymer matrix. Particles of a material confer a semiconducting character to the layer. The particles are dispersed in the matrix. The particles include nanostructures.

Abstract: A turbo machine having a rotor and a stator is at least partially provided on a flow-guiding part with a catalytic coating. The catalytic coating (7, 7?) comprises at least one oxide of a transition metal or an oxide of a mixture of transition metals, wherein the transition metals are elements from groups I B, in particular Cu, Ag, Ag, II B, in particular Zn, Cd, Hg, III B, in particular Sc, Y, IV B, in particular Ti, Zr, Hf, V B, in particular V, Nb, Ta, VI B, in particular Cr, Mo, W, VII B, in particular Mn, Tc, Re and/or VIII B, in particular Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt.