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I am planning to use polydimethylsiloxane (PDMS) to create 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, the air bubbles will be introduced. I have learned that one way (available to me) is using the negative pressure/ vacuum pump to remove bubbles / de-gas the solution. Does any one knows what negative pressure is sufficient to remove the air from the gel-like solution?

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