mtv messtechnik has trimmed both the CC 1000 and CC 3000 series for ergonomics and easy handling. Thus, all of the company's cross-cut testers are equipped with an automatic reset. The practical carrying case in which they are delivered contains, in addition to the respective device, an illuminated magnifying glass, medium-hard brush depending on the model version, and an Allen key. The latter is used to change the cutting tool. It is recommended to replace the cutting edge after 200 to 500 grid cuts - depending on the hardness of the substrate.
Cross-cutting according to DIN EN ISO 2409 and ASTM D 3359 can be used to test the adhesion of coatings and painted surfaces up to a maximum layer thickness of 250 µm. To do this, the materials tester makes six parallel scribe cuts and six additional "cross cuts" at right angles on the coating to be evaluated. Depending on the coating thickness, the spacing of the individual cuts can be one to three millimeters. In this way, a uniform pattern - a grid - of 25 squares is created. After the cross-cut has been made, loose particles are removed and the result is evaluated. A distinction is made between cross-cut characteristic values from 0 (very good) to 5 (very poor), abbreviated Gt 0 to Gt 5.