I am planning to use polydimethylsiloxane (PDMS) to create a phantom for mimicking tissue for imaging. For this, I plan on using SYLGARD® 184, which is a viscous liquid. When adding other components to it, air bubbles will be introduced.
I have learned that one way (available to me) to remove bubbles / de-gas the solution is by using a vacuum pump to create negative pressure. What negative pressure is sufficient to remove the air from the gel-like solution?