I have a problem with a paste that I am attempting to extrude through a glass syringe. The paste is about the consistency of toothpaste and has very small (under 150 micron) particles suspended in it. When I attempt to apply a constant load to the teflon pusher of a glass syringe, I do not get a constant flow rate. When I lubricate the system with a PFPE lubricant (which is not soluble in the paste or any of its components) it seems to get a little better, but I still don't get a constant flow rate. Does anyone have any experience with extruding pastes and or tribology that can help me take this problem apart. One interesting thing that I noticed is that the paste seems to stick very well to stainless steel, so I'm wondering if it is sticking to the glass as well, causing the system to bind.
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