Viscosity Standard FAQ

Viscosity Standards FAQ

All your burning questions about Viscosity Standards Answered.

For more information, please select a topic from the list below.

• Why do I need a viscosity standard?
• How often do I need to replace my viscosity standard?
• How many viscosity standards do I need?
• What are the different types of viscosity standards?
• Should I use silicone oil or mineral oil?
• How do I store and handle viscosity standards?
• How often should I calibrate my viscosity measurement instrument using a viscosity standard?
• Can I use a viscosity standard with a different temperature or viscosity range than my sample?
• What is the difference between kinematic viscosity standards and dynamic viscosity standards?
• My fluid has a viscosity value that is not part of your standard fluids listing, what should I do?
• Where can I see a full list of available viscosity standards?

Why Do I Need A Viscosity Standard?

Viscosity standards are used to check the accuracy of your viscometer. Silicone and Mineral Oil Standards provide you with a fluid viscosity value that is constant at 25°C, making calibration verification easy to establish. Standards are a traceable part of calibration verification - an important component of many certifying quality systems like ISO, ASHTO, etc.

Special order Silicone fluids are also available with specified viscosity values at temperatures between 10°C and 80°C.

How often do I need to replace my viscosity standard?

For optimum performance of your instrument, viscosity standards should be replaced on an annual basis. It is also essential to perform regular checks on your standards, to ensure that they have not become contaminated or degraded.

How Many Viscosity Standards Do I Need?

The number of viscosity standards needed depends on the number of instruments and measurement ranges used in the laboratory, as well as the frequency and level of accuracy required for viscosity measurements. It is recommended to have at least two viscosity standards for each instrument to verify the instrument's performance and ensure the accuracy of the measurements.
The choice of viscosity standards depends on the instrument's measurement range and the type of sample being measured. It is essential to have viscosity standards that cover the full range of the instrument's measurement capabilities, from low to high viscosities. It is also important to select standards that closely match the viscosity and temperature range of the samples being measured.
In addition to the primary standards, it is recommended to have secondary or check standards that are used to verify the instrument's calibration or to detect any changes or drift in the instrument's performance. These secondary standards can be less expensive and cover a smaller range of viscosities than the primary standards.

What are the different types of viscosity standards?

There are two main types of viscosity standards: viscosity reference fluids and viscosity calibration oils. Viscosity reference fluids are fluids with known viscosity values that are used to check the performance of a viscometer or rheometer. Viscosity calibration oils are used to calibrate or adjust the instrument's calibration to ensure accurate and consistent measurements.

Should I Use Silicone Or Mineral Oil Viscosity Standards?

This choice is dependent on your product. Silicone is used most often because it is less temperature sensitive. Some manufacturers, such as the paint industry, cannot have silicone in their process, so mineral oil becomes the choice.

The following are recommendations for Brookfield Viscosity Standards:

Silicone

All viscometers using regular spindles, Small Sample Adapters and UL Adapters

High Temperature Silicone (HT)

All viscometers using the Thermosel accessory and Controllers

Mineral Oil

Krebs Oil Fluids are for use with the KU series viscometers
CAP fluids for CAP series viscometers
Special Purpose Mineral Oil
Encouraged for Wells/Brookfield Cone/Plate Viscometers

How do I store and handle viscosity standards?

Viscosity standards should be stored in their original containers and protected from light, moisture, and extreme temperatures. It is recommended to handle the standards with care to avoid contamination or evaporation. Before use, allow the standard to equilibrate to the testing temperature and gently mix to ensure homogeneity.

How often should I calibrate my viscosity measurement instrument using a viscosity standard?

The frequency of calibration depends on the instrument's specifications, the level of accuracy required, and the frequency of use. Typically, it is recommended to calibrate the instrument at least once a year or more frequently if the instrument is heavily used or has been subjected to extreme conditions. Regular checks using viscosity reference fluids can also help detect any drift or changes in the instrument's performance.

Can I use a viscosity standard with a different temperature or viscosity range than my sample?

It is essential to use a viscosity standard that matches the viscosity and temperature range of the sample being measured to ensure accurate and reliable results. If a different standard is used, the measurement may not be accurate, and the instrument's calibration may need to be adjusted accordingly. It is recommended to consult the instrument manufacturer's recommendations or technical support team for guidance on choosing the appropriate standard for your specific application.

What is the difference between kinematic viscosity standards and dynamic viscosity standards?

Kinematic viscosity standards are used to calibrate viscometers that measure the time it takes for a fluid to flow through a capillary tube, while dynamic viscosity standards are used to calibrate rheometers that measure the force required to rotate or oscillate a spindle or plate in a fluid. It is essential to use the correct type of standard for the specific viscosity measurement technique.

My Fluid Has A Viscosity That Is Not Part Of The Standard Fluids Listing, What Should I Do?

The viscosity of your sample fluid is typically of little importance when checking the accuracy of your Brookfield Viscometer, because:

1. your fluid may be non-Newtonian, so the viscosity will change; Viscosity Standard fluids will not change with time or shear (rpm), making the calibration check more definable
2. your Viscometer is no more or less accurate at one range (rpm and spindle) than the next; if the Viscometer passes at one range, it can be considered to be calibrated throughout its entire range

.........with this in mind, you probably don't need a special order blend fluid

Where can I see a full list of available viscosity standards?

Our full range can be viewed on the Viscosity Standards section of our website. If you have a need that is not covered in this range, please contact our Sales Team. You can see the full Brookfield Ametek Viscometer range on our website, as well.

Also, be sure to check out our article on how Viscosity Standards Help to Avoid Production Downtimes.

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