I hope this isn't too simple for this site. I have had a challenge at work trying to eliminate air bubbles from a paste in a 20oz cartridge. The cartridge has a piston in one end to push the material out and the other end tapers to a small threaded 3/8" opening. I won't take the time explain how the bubbles are introduced in the first place, let's assume it is an uncontrollable variable. I know vacuum can suck the bubbles out, but this paste has a high viscosity and it does not work. the vacuum ends up sucking the material out of the tube. Also, vibrating the material can cause the bubbles to float to the surface, but again, the viscosity is the problem. I'd like to try spinning the cartridge in something resembling a centrifuge. My first question is this: will the heavy paste moving to the outside of the spinning cartridge displace the air, forcing it to the center? If I end up with a cartridge of paste with a cylindrical tube of air in the center, I would still need to figure out how to extract the air, but at least it would be contained in a defined area. Is this theory on where the air would end up correct? Also, does anyone know how I can test this theory? Seems easy enough, but I have not been able to come up with anything. Any advice is much appreciated.