The present invention concerns items that contain or consist of a plasma polymer product, consisting of carbon, silicon, oxygen and hydrogen, wherein the ESCA spectrum of the plasma polymer product, with calibration to the aliphatic portion of the C 1s peak at 285.00 eV, in comparison with a trimethylsiloxy-terminated polydimethylsiloxane (PDMS) with a kinematic viscosity of 350 mm2/s at 25° C. and a density of 0.97 g/ml at 25° C.,the Si 2p peak has a bond energy that is shifted by 0.44 eV, at most, to higher or lower bond energies, and the O 1s peak has a bond energy that is shifted by 0.50 eV, at most, to higher or lower bond energies.