The polydimethylsiloxanes have a low surface tension (20.4 mN/m) and are capable of wetting most surfaces.
With the methyl groups pointing to the outside, this gives very hydrophobic films and a surface with good release
properties, particularly if the film is cured after application. Silicone surface tension is also in the most promising range considered for biocompatible elastomers (20 to 30 mN/m)