A fluid’s viscosity or “thickness” certainly affects how it will behave in a Foam Pump(KEXON), but it’s complicated because the viscosity of fluids can change under different conditions. There are four main groups of fluids – each group acts a certain way despite its specific viscosity. First, you have fluids like water, oil, alcohol and paint thinner. With these so-called “Newtonian fluids,” it does not matter how fast they move or how much you agitate them, they flow the same.

The second type is “dilatant fluids” like cream and butter, whose viscosity increases with agitation until they become almost solid. “They are impossible to pump in standard centrifugal pumps and require special measures to move them,” notes Sren Mortensen.

Third, “plastic fluids” have a yield value (the point of resistance) that must be exceeded before they can start flowing. After that point, viscosity decreases as agitation increases. “The best example of a plastic fluid is ketchup,” says Sren Mortensen. “Think about how you have to shake it up in a bottle before it starts to move, but once it is moving, it flows easily.”

The fourth group, “thixotropic fluids,” is the hardest to explain… and to deal with in pumps. Glues, non-drip paint, greases, cellulose compounds, soaps, starches and tar all fall into this category. These fluids are viscous (thick) when standing still, but will become less viscous (thinner) over time with constant agitation.

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