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Evaluating the scrub resistance of paint
2019/07/25
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The scratch resistance can be evaluated in terms of gloss reduction, haze, magnitude of deformation, resistance towards deformation, weight loss or color change of the substrate.Coated surfaces need to be tested for resistance to abrasion caused by a brush, sponge, or other means.
This scrub Abrasion tester is widely used to test the resistance of many materials to scrub, abrasion and washing. Paints, varnishes, other coatings and finishing can be applied on various supporting media e.g. plastic, glass, wood, paper, leather and submitted to the accelerated test, by reciprocating brushes, sponges or abrasives on the samples with (or without) reagent depending on methods. When applicable, the machine is fitted with a dosing peristaltic pump.
The importance of evaluating the scrub resistance of a paint is to confirm that it will maintain the expected visual appearance after washing with a brush or cloth to remove dirt and other markings, and that it will maintain its physical properties, i.e., no softening, blistering, or thinning when exposed to cleaning products. If the paint shows any visual changes in appearance when compared to a non-scrubbed area, then the paint is said to possess poor scrub resistance.
The advantage of evaluating the scrub resistance of paints in the laboratory is the regulation of the type of brush or cloth, the cleaning medium and the weight (amount of pressure) used to perform the testing. These standardizations are intended to remove some of the subjectivity of the evaluation and generate results that are comparable between products, even when tested at different locations by different entities.
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