1. The polydimethylsiloxanes have a low surface tension (20.4 mN/m) and are capable of wetting most surfaces.
2. 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 applica-
tion.
3. Silicone surface tension is also in the most promising range considered for biocompatible elastomers (20 to 30mN1m).