Today we’re talking about dynamic and kinematic viscosity.

The term original coating performances control makes reference to taking care of certain physical properties of the coatings and paints applied on products during or before their application.

The idea is to make sure those properties meet the requirements of the specific application, which usually include:

  • Corrosion protection
  • Adhesion
  • Protection of materials against degradation
  • Thermal insulation
  • Fireproof protection
  • Electric insulation

The main physical properties considered under original coating performances control are flow time and dynamic viscosity coefficient, and there are different tools and equipment to measure and control their values.

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What is coating flow time?

Flow time is a property that gives a good idea of the viscosity of a Newtonian fluid, in other words, a fluid whose viscosity does not vary with the speed with which it is measured.

By measuring the flow time of a coating, it is possible to determine the kinematic viscosity it has, which informs about its suitability for the application in hand.

How to control coating flow time

The most common way to control coating flow time is by means of flow cups. As the name suggests, flow cups are tools with the shape of a cup which are used to quickly determine the flow time and kinematic viscosity of Newtonian fluids.

The process of measuring and controlling flow time with a flow cup consists in making a specific volume of the coating flow through the cup which has a small orifice while measuring the time it takes for the first irregular flow to happen.

The advantages provided by using flow cups to determine the flow time (kinematic viscosity) of a coating are:

  • Simplicity and portability.
  • Obtaining results quickly.
  • Any Newtonian fluid can be tested with accurate results.

Flow cups are normally categorized according to the standard used in their designs. Among the most common types we can find:

flow cups

In photo our flow cups models

What are common applications of Flow Cups?

Flow cups are commonly used to control de performance of different coating materials such as paints, inks or lacquers. Therefore, almost any industry working with this type of coatings can benefit from using flow cups.

However, the most common industrial sectors where flow cups are used include, but are not limited to:

  • Ceramics
  • Food and drinks
  • Automotive
  • Chemicals
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What is coating dynamic viscosity coefficient?

A coating dynamic viscosity coefficient, in simple words, represents a value of the resistance the internal particles of the coating to the movement or to applied stress.

Another definition could be that it is the resistance of the coating to flow relative to another fluid moving at a specific speed.

The bottom line is that knowing the dynamic viscosity coefficient of your coating will allow you to better understand how much of it must be applied to achieve the expected results, and it will also help you calibrate the tools used to apply such coating, for example, airbrushes or sprayers.

This results in added benefits, such as:

  • Reduced costs that may result from adding unnecessary layers of coating.
  • Reduced processing times.
  • Increased productivity.
  • Increased profitability.
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How to measure and control the coating dynamic viscosity coefficient

There may be more than one option for measuring and controlling the dynamic viscosity coefficient of a coating.

However, there is one type of instrument that excels above the rest, rotational viscometers.

Rotational viscometers, like our SAVISC186 model, allow you to check the dynamic viscosity of your coating at a specific operating temperature.

This is important because temperature is one of the environmental aspects that can have the most impact on the viscosity of your coating.

The process of measuring the dynamic viscosity with a rotational viscosimeter starts by pouring a sample of the coating into a container and placing the container so that the spindle of the viscometer is inside the coating.

Then, the spindle rotates at a constant speed and the viscometer measures the torque to determine the viscosity.

Digital rotary viscometers – SAVISC152

In photo: Digital rotary viscometers – SAVISC152

What are common applications of Rotational Viscometers?

Similar to what we mentioned for flow cups, different industries requiring viscosity control apply Rotational Viscometers.

More specifically, this type of instruments is especially useful when controlling dynamic viscosity on non-Newtonian fluids.

The most relevant applications of rotational viscometers are found in the following industries:

  • Oil and gas
  • Petrol chemistry
  • Pharmaceutical
  • Food and drinks
  • Laboratory testing
  • Scientific research
application sectors

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How to select a coating performance control instrument?

Acquiring the right coating performance control instrument for your specific application is very important to guarantee you obtain accurate results and the application of the coating is successful.

There are different aspects that require consideration when selecting the right instrument.

The most relevant are:

  • Type of coating material (Newtonian or non-Newtonian).
  • Standard used for the measurement.
  • Whether temperature control is necessary.
  • The need for portability.

[Video] How to measure the viscosity? Viscosimeter – SAMA Tools



Here at SAMA Tools, we offer a wide variety of instruments and tools to control original coating performance, and we pride ourselves to offer our customers the best product on the market while ensuring high quality and interesting prices.

Our customers can rest assured that they get high quality supported by years of experience in the field and a great customer service both during the purchase and in the form of after-sale assistance. Read on!

If you want to check the original coating performance control instruments we offer to select the one for your application, just click here.

Of course, if you are not sure yet or have any doubts about the original coating performance control instruments we offer, or any other of our products, our recommendation is to contact us or call us at 0584/392342 – 0584/392453 and one of our experts will gladly help you.