[[RTV Silicone]] has a viscosity of 11,000 centipoise. - Degassing should be done at 29 inHg - The silicone will increase in volume as it degasses, so it should be mixed in a larger container than it sets in. > Vacuum de-gassing expands the air trapped during mixing or pouring, causing the bubbles to grow, rise to the surface, and in most cases, release. After a period of time the amount of trapped air decreases. The material’s viscosity and surface tension will determine how easily the air will escape. Certain materials appear to bubble indefinitely until the vacuum pump is turned off. In order to maximize the vacuum’s potential for air removal, the pump must be capable of pulling 29.6 inHg. > - https://hapcoincorporated.com/blog/vacuum-vs-pressure-when-resin-casting/ https://www.vacuum-degassing.com/vacuum-degassing/degassing-technical