Washability and Scrubbing Resistance
The Model 494 MC is used to evaluate the wash/scrub resistance and cleanability of coatings (especially emulsion paints and “wall paints”). There are wide-range parameter settings so that the individual tests can be specified as required (e.g. for testing cleaning solutions, etc.). The basic unit can be levelled and is equipped with a cover plate for supporting the steel tub. It also has an integrated clamp for holding the sample. A high-precision stepper motor with a micro-controller uses a toothed belt drive with high repeatability to generate the periodic linear movement of a running frame that holds up to three scrubbers. The running frame has a pivot-mount so that the scrubber can be inserted. It is designed so that three parallel scouring tests can be carried out at the same time. A matt black PVC foil will be coated, and – if required – soiled in a defined manner. After clamping into the device it will be exposed under the influence of a washing liquid the stress of the moving scrub body.
- Test in accordance with DIN 53 778- 2 *) (Mod. 494 MC-Basic DIN or Mod. 494 MC)
The scrub body is a defined pig bristle brush, which is charged with 250 g. The washing fluid is continuously fed by a micro dosing pump. Whether the contamination has been removed or the coating is scrubbed through to the substrate, will be checked after an agreed number of scrubbing cycles. *) withdrawn, replaced by DIN EN ISO 11998
- Test in accordance with DIN EN ISO 11 998 (Mod. 494 MC-Basic ISO or Mod. 494 MC)
The scrubbing body is a defined type of abrasive pad loaded with 135 g, which is moistened prior to the test only once with a defined quantity of the washing fluid. After scrubbing strain (200 double strokes) the mass loss per unit area of the coating and the average layer thickness loss will be determined.