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ISO 2431 is an international ISO test method that determines the flow time of paints and varnishes using flow cups.
The flow time of a fluid will help you to understand its viscosity. The higher the viscosity of a fluid, the more it will resist flow. When you move two fluid layers against one another you create a friction, known as flow resistance.
Through flow resistance testing, it’s possible to calculate a sample’s viscosity. The formula for working this out is a simple one: viscosity = shear stress / shear rate.
Flow cups are also known as viscosity cups. Flow time testing with flow cups is a relatively straightforward method. It involves putting a sample in a container with a hole in the bottom then measuring the time it takes to fill a cup placed below it.
ISO 2431 doesn’t cover flow cups with a replaceable jet or some commonly used dipping flow cups. But it does suggest two methods for checking the wear and tear of your flow cups.
So, how can Industrial Physics improve your ISO 2431 testing?
Viscosity Cup ISO 2431 is a range of titanium anodized aluminum viscosity cups with fixed stainless steel nozzles (inner cavity). These viscosity cups are for laboratory use and should be supported with a stand to measure the viscosity of lacquers, paint and other liquids.
The DIN 53211 Immersion Viscosity Cup is a range of titanium anodized aluminum or stainless steel viscosity cups for measuring paint, coatings and other fluids during application or production.
Industrial Physics has been making viscosity cups for many years. We like to share the insight we’ve gained with our customers. Check out the knowledgebase section of our website. Here you’ll find articles that delve into all manner of paint testing subjects including viscosity testing best practice.
For help to make sure you choose the right flow cup for your viscosity testing or to see the viscosity rating of calibration oils at a glance, be sure to check out our handy viscosity conversion chart.
If you have any further questions then don’t hesitate to get in touch!
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