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I think that 'gel' is also used for fake boobs ! [img]/images/graemlins/smile.gif[/img] sorry completely off topic but had to say it
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That would be polydimethylsiloxane (PDMS). It is also used in
microfluidic devices and as a food additive. I'm using it in my research project to build a test structure to measure the electrical properties of a self-assembled monolayer of alkanethiol molecules. It's versatile stuff.