Viscosity is an essential parameter in the behaviour of paints, varnishes and coatings, both in their manufacture and application.
Viscosity is an essential parameter in the behaviour of paints, varnishes and coatings, both in their manufacture and application.
Proper viscosity control ensures:
During formulation, it is essential to consider the application method, working temperature and the rheological behaviour of the product (viscosity at different shear rates and thixotropy), to avoid subsequent problems in the application process.
Similarly, when formulating a paint, it is necessary to know both the application method and the temperatures at which it will be applied, so during the development of the mixture, adequate control of viscosities at low and high shear rates is necessary, as well as evaluation of the thixotropy present.
Made of anodised aluminium with a stainless steel flow jet. Volume 100 ml. Non-standard versions available for comparative testing.
UNE EN ISO 2431
Code
Cup type
Code
Description
Code
Description
HI-151-1
Thermometer with foldable probe for checking the temperature of the sample. Range from -50°C to 300°C
Standards
UNE EN ISO 2431
Why is viscosity a critical parameter in a paint?
Viscosity directly influences the application, levelling, spraying, coverage and final finish of the coating. An inappropriate value can lead to defects and difficulties during application.
When is it advisable to use a UNE-ISO cup rather than a rheometer?
UNE-ISO cups are ideal for rapid production and quality checks. Rheometers are used when it is necessary to analyse more complex rheological behaviour.
How does temperature affect the viscosity measured using a UNE-ISO cup?
Viscosity decreases as temperature increases. For this reason, many measurements are carried out at controlled temperatures of 20 °C, 23 °C or 25 °C, depending on the applicable standard or specification.
Why might two paints of the same colour have different viscosities?
Because viscosity depends on factors such as the composition of resins, additives, pigments, solids and solvents, not solely on the colour or visual appearance of the product.
