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ÖNORM EN ISO 4628-7:2004-01

Заменен
Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 7: Assessment of degree of chalking by velvet method (ISO 4628-7:2003)
This part of ISO 4628 describes 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 reference comparator G as described in ISO 8503-1).
The test method specified may also be used for the assessment of the degree of chalking of coatings and
coating systems on smooth surfaces, but the method specified in ISO 4628-6 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.
NOTE 1 When a reference to this test method is included in specifications, the test conditions (i.e. weathering method
and substrate) should be agreed between the interested parties.
NOTE 2 The method described in this part of ISO 4628 is a relative ranking method and is therefore not suitable for
use in agreements between parties. See, however, the Note to Table 1.
ISO 4628-1 defines the system used for designating the quantity and size of defects and the intensity of
changes in appearance of coatings and outlines the general principles of the system. This system is intended
to be used, in particular, for defects caused by ageing and weathering, and for uniform changes such as
colour changes, for example yellowing.
Dieser Teil von ISO 4628 legt ein Verfahren zum Bewerten des Kreidungsgrades von weißen oder farbigen Beschichtungen und Beschichtungssystemen im Außenbereich auf rauen Oberflächen fest, die eine Rauheit größer als Segment 4 des Rauheitsvergleichsmusters G nach ISO 8503-1 haben. Das Prüfverfahren ist auf Beschichtungen und Beschichtungssysteme auf mineralischen Untergründen, z. B. Faserzement, Ziegelsteinen, Beton und Putzen, unabhängig von der Struktur der Oberfläche, anwendbar. Das Prüfverfahren sollte von erfahrenen Prüfern eingesetzt werden und wird sowohl für Labor- als auch für Feldprüfungen empfohlen. Falls dieses Prüfverfahren für Spezifikationen herangezogen wird, müssen die Prüfbedingungen (z.B. Bewitterungsverfahren und Substrat) zwischen den Vertragspartnern vereinbart werden.
ICS
87.040 Paints. Including coating powders, paint coatings and protective paint systems / Краски и лаки. Включая порошки для нанесения покрытий, лакокрасочные покрытия и системы защитной окраски