Besides, you want your tests to be reliable, so it's important to make sure that you buy washability testers from a reputable source. Your best bet is to read individual product reviews online. One of the most popular brands for industrial equipment such as scrub abrasion and washability is TestCoat. Each of the products has its own unique features and benefits, and the same can be said for their service. For example, TestCoat offers a wide variety of scrub abrasion and washability testers in different capacities. This means that they can test for different types of abrasive materials. TestCoat also takes account for varying washability levels with their washability testers, so your results are always accurate.
The methods of testing vary depending on the properties that you want to test: crack, abrasion and also wet ability of a material in liquid, emulsion or suspension state which affect in particular the lifetimes of adhesives and other materials used in the industry.
Abrasion tests can be performed dry or wet. In the dry test, the material is rubbed by a standard load (50 N) on a 10 and 1/2 cm steel ball for 120 seconds. The wear depth (mm) is calculated from the average of 3 measurements carried out in 5 points on the sample surface. The washability test determines the resistance of materials to washing with water, using a spray gun with water at 15 bar pressure and room temperature for 10 minutes, and then drying. A reduction in mass is regarded as evidence of washing ability.
During normal use, some materials such as paints are exposed to damage through rubbing between two surfaces in contact. This phenomenon can be measured in a laboratory using the test for abrasion resistance (Cobb Test), or the wet abrasion test, which simulates the effect of two rubbing surfaces in contact, immersed in water. The test comprises rubbing each surface against the other by means of a rotating steel ball for 10 minutes. The steel ball has a diameter of 10.2 cm and weighs 50 g.
Wear is defined as depth (mm) lost due to friction between 2 surfaces in contact immersed in water at room temperature for 10 minutes, with at least 3 measurements per point on the surface to be tested. The reduction in surface area is measured in mm squared. The results are expressed as % weight loss on mass of a sample.
The test results are determined by the energy of friction, and therefore based on the law of conservation of energy, which states that during the rubbing process energy is lost by friction and dissipated into heat (according to the second law of thermodynamics). In practice, it is not possible to measure all this dissipated energy.
It's easier than ever to find the best and most affordable scrub abrasion and washability testers. The price differences can be dramatic, so it pays to shop around a bit, and make sure that you know exactly what you need.
About TestCoat:
For many years, TestCoat has been a trustworthy partner and leader in the supply and distribution of inspection equipment, laboratory & physical test equipment for the coatings and paint industries. We supply non-destructive quality control and testing instruments such as Paint thickness Mil Gauges, Gloss meters, portable and benchtop metal hardness testers, laboratory mixersviscometers, film applicatorsdrying time recorder, cupping testers, Wet scrub abrasion testers, Coating inspection kits with advanced technology, and of the highest standards.
For more information, visit https://www.testcoat-usa.com/
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