Physical Testing Standards for Wet Abrasion Scrub Tester

Abrasion Scrubbing Resistance Tester often referred to as scrub, abrasion and washability testers are designed to provide an accelerated method for determining wear resistance of surface coatings, and also to test the performance of cleaning compounds. The machines provide precisely controlled conditions, repeatability of results and close comparability of performance.

Coated surfaces need to be tested for resistance to abrasion caused by a brush, sponge, or other means. The Wet Abrasion Tester produces a repeatable, controlled condition to simulate everyday use or wear patterns. The abrasion tester can examine washability and related properties that affect the stain resistance of coatings. Detergent performance testing can also be determined in a reproducible manner.

■ Features two brush holders for side by side testing

■ Air cooled electric motor for maximum reliability

■ Peristaltic fluid pump – no reagent contamination (except for PB-5002, PB-5007)

■ Five digit preset counter – activates the machine for preset number of strokes, then switches off

■ Can be modified to meet DIN, ISO, or ASTM test methods Standards ASTM D 2486, D 3450, D 4213, D 4828 53778*, 13 300 11998 DIN EN ISO DIN ISO Methods

The Wet Abrasion Scrub Tester is designed to comply with four ASTM methods.

DIN 53 778 (*withdrawn 08/2007): Dispersion Paints Cleanability: Test area should be free of pollutions Wash resistance: Evaluation after 1000 scrub cycles Scrub resistance: Evaluation after 5000 scrub cycles The test is performed wet using a hog bristle brush and a pump to apply the washing liquid. The evaluation is done visually.

DIN EN 13300 This standard describes the various testing methods for waterborne coating materials and coating systems for interior walls and ceilings. One quality criterion mentioned is the wet-abrasion resistance tested in accordance to EN ISO 11998. Additionally, a rating scale dependent on the amount of abrasion is used for final classification.

ASTM D 3450 This test method determines the ease of removing soilant discoloration from interior coatings. The coating is drawdown on a black plastic panel and allowed to dry for seven days. A specified soilant medium is applied. The coating is scrubbed with an abrasive or non-abrasive media using a cellulosic type sponge for 100 cycles. The soilant removal is assessed by measuring the CIE Y reflectance before and after the test.

ASTM D 4213 The purpose of this method is to measure scrub resistance. The primary differences from ASTM D 2486 method are: The scrub resistance is determined by weight loss of the paint film relative to a standard calibration panel. The test panel and calibration panel are scrubbed simultaneously. The scrubbing device is a ScotchBrite™7448 abrasive pad.

ASTM D 4828 This test method determines the relative ease of removing soil and stains from interior coatings. The coating is applied to a black plastic panel and dried for seven days. The soilant can be user defined or the soilant described in ASTM D 3450 can also be used. A user defined liquid or powder cleaner is applied. The panel is scrubbed 100 cycles with a sponge. The soilant removal is assessed using gloss or color measurement.

The ISO test method describes a short version of the scrub abrasion test. This test uses “3M Scotch Brite 7448“ pads and the washing liquid is manually applied before starting the test. The test is finished for evaluation after 200 scrub-cycles. The evaluation of the wash/scrub resistance is done by calculating the loss of mass.

ASTM D 2486 The scrub resistance of interior wall paint is the primary purpose of this method. The paint is applied to a black plastic panel and allowed to cure. The panel is scrubbed with a nylon bristle brush until failure occurs. An abrasive scrub media is used to accelerate the test.

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