The following graph illustrates how a typical filled epoxy resin reduces in viscosity as it is heated. To reduce the viscosity of paste materials to allow easier pumping, heat is often applied. The higher the difference in viscosity at the two speeds, the more thixotropic the material is and easier to pump. This will provide a"thixotropic index" for the particular material. One way to differentiate between easy and difficult to flow pastes is to obtain Brookfield viscosities using the same spindle at two different rotational speeds, usually a tenfold difference (e.g. These materials require special consideration regarding their feeding into metering pumps to assure the metering pump does not cavitate or to prevent air from being introduced into the material. 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. 1 Centipoise = 1 mPa s (Millipascal Second).This is typically designated in units of centipoise or poise but can be expressed in other acceptable measurements as well. Viscosity is the measurement of a fluid's internal resistance to flow.
Viscosity scale download#
Approximate Viscosities of Common MaterialsĬlick Here To Download More Viscosities Of Common Liquids Viscosity If you do not see your product listed, or are unsure of its viscosity, one of our filling system experts would be more than glad to provide assistance. It can also be a great resource when trying to find an appropriate filling pump to be used with your system. While these are only average estimates, it is useful to have an idea of the viscosity of your product when working with one of our filling system experts. Our viscosity chart can help you get an idea of how thick your product is.
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