Others do not seek their own level or flow at all and require pressure to move them from the supply container (cartridges. Some paste viscosity materials will seek their own level or flow slowly and the shorter the time it takes, the easier they are to pump. Paste viscosity is a vague term the viscosity of many materials but needs further definition to design a machine. They appear thick or viscous but actually pump quite easily. Ketchup and mayonnaise are examples of thixotropic materials. Thixotropic materials reduce their viscosity as agitation or pressure is increased at a constant temperature. Water and oils are examples of Newtonian liquids. Newtonian materials are referred to as true liquids since their viscosity or consistency is not affected by shear such as agitation or pumping at a constant temperature.
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