Viscosity standards are used to check the accuracy of your viscometer. Brookfield silicone and mineral oil standards give you a fluid viscosity value constant at 25°C, making calibration verification easy to establish. Standards are a traceable part of calibration verification - an important part of many accredited quality systems such as ISO, ASHTO, etc.
How many viscosity standards do I need?
Usually one or two is enough. Choose a fluid with a viscosity value suitable for the measuring range of the spindle and the speed normally used.
Should I be using a silicone or mineral oil viscosity standard?
This choice depends on your product. Silicone is commonly used because it is less sensitive to temperature. Some manufacturers, such as the paint industry, cannot use silicones in their processes, so mineral oils are the preferred choice.
Brookfield made specific recommendations:
Silica gel
All viscometers use conventional spindles, small sample adapters and UL adapters
High temperature silicone (HT)
All viscometers use Thermosel accessories and controllers
mineral oil
KU Liquid for KU Viscometer
CAP Liquid for CAP1000 and CAP2000 Viscometers
special purpose mineral oil
Encourage Wells/Brookfield Cone/Plate Viscometer
My fluid has a viscosity that is not part of your standard fluid listing, what should I do?
When checking the accuracy of a Brookfield viscometer, the viscosity of the sample fluid is usually of less importance because:
- Your fluid may be non-Newtonian, so viscosity will change; Brookfield Viscosity Standard fluids do not change with time or shear (rpm), making calibration checks more definitive
- Your Brookfield viscometer will not be more or less accurate on one range (rpm and spindle) than the next; if the viscometer passes in one range, it can be considered calibrated over the entire range
......With this in mind, you probably don't need a special order mix
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