New basic variants of the wash and scrub resistance tester model 494 MC
The instrument ERICHSEN Washibility and Scrubbing Resistance Tester, Model 494 MC (attached with leveling feet) has a top cover plate on which the steel trough for the testing performance is placed. Further, it is equipped with two specimen clamping devices. A high-precision step motor operated by a microcontroller allows a periodic linear movement of the drive frame which holds/guides the abrasion bodies, with a high repeatability. The swivel-mounted frame for inserting the abrasion bodies is designed for holding/guiding up to three of them. Due to this up to three parallel abrasion tests are possible. For tests according with DIN EN ISO 11998, the supplied ISO adapter has to be mounted (Mod. 494 MC-Basic ISO).
The operation / controlling the stroke (start, stop, reset) via keypad and 6-line-display is comfortable.
Purpose and Application: The ERICHSEN Washibility and Scrubbing Resistance Tester, Model 494 MC, is mainly intended for the determination of the washing and scrubbing resistance as well as cleanability of dispersion paints (specifically ”wall paints”). The wide range of its adjustable parameters allows also some further tailored/customized testing matters (for example for testing cleaning agents/solutions, etc.) as well.
Principle of Test: In the above standard applications 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.
New basic variants:
Test in accordance with DIN 53 778- 2 *) (Mod. 494 MC-Basic DIN)
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 *) withdrawn, replaced by DIN EN ISO 11998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)
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.