BS EN ISO 4628-7:2016

This part of ISO4628 specifies a method suitable, in particular, for rating the degree of chalking on white or coloured exterior coatings and coating systems on rough surfaces (i.e. those having a roughness greater than segment 4 of the reference comparator G as described in ISO8503‑1 ). The test method specified can also be used for the assessment of the degree of chalking of coatings and coating systems on smooth surfaces, but the method specified in ISO4628‑6:2011 is preferable for this purpose. The test method is applicable to coatings and coating systems on mineral substrates, e.g. fibre cement, brick, concrete, and renderings, independent of the structure of the surface. The method can be used quite effectively by experienced operators and is recommended for laboratory use as well as for on-site evaluation. NOTE1 When a reference to this test method is included in specifications, the test conditions (i.e. weathering method and substrate) have to be agreed between the interested parties. NOTE2 The method described in this part of ISO4628 is a relative ranking method and is therefore not suitable for use in agreements between parties. See, however, the Note to Table1. NOTE3 Refer to ISO4628‑1 for the designation system for quantity and size of defects and the intensity of changes in appearance of coatings, as well as general principles of the system.