On completion of the defined test period, any residues of test liquid are removed and the material surface assessed and analyzed for visible alterations in accordance with DIN EN ISO 4628-1 to -5.ISO 4628-1 Paints and varnishes - Evaluation of degradation of coatings - De-signation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 1: General introduction and designation system (ISO 4628-1:2003); German Version EN ISO 4628-1:2003ISO 4628-2 Paints and varnishes - Evaluation of degradation of coatings - De-signation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 2: Assessment of degree of blistering (ISO 46282:2003); German Version EN ISO 46282:2003ISO 4628-3 Paints and varnishes - Evaluation of degradation of coatings - De-signation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 3: Assessment of degree of rusting (ISO 4628-3:2003); German Version EN ISO 4628-3:2003ISO 4628-4 Paints and varnishes - Evaluation of degradation of coatings - De-signation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 4: Assessment of degree of cracking (ISO 46284:2003); German Version EN ISO 46284:2003ISO 4628-5 Paints and varnishes - Evaluation of degradation of coatings - De-signation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 5: Assessment of degree of flaking (ISO 46285:2003); German Version EN ISO 46285:2003 To ascertain a possible regeneration time, the assessment is made once immediately after removal of the test liquid and again one hour later. In compliance with DIN EN ISO 4628-1, the following criteria are grouped into Classes 0 to 5: amount of damage (N), size of damage (S) and intensity of alteration (I). Any other changes observed are also noted. The assessment is made as shown below:
