А Префаце
ИСО (Међународна организација за стандардизацију) је глобални савез националних тела за стандардизацију (Тела чланица ИСО). Развој међународних стандарда се обично спроводи преко ИСО техничких комитета. Свака институција чланица заинтересована за предмет за који је основан технички комитет има право да буде заступљена у комитету. У овај посао су укључене и владине и невладине међународне организације које су у вези са организацијама за стандардизацију. ИСО блиско сарађује са Међународном електротехничком комисијом (ИЕЦ) о свим питањима електричне стандардизације.

The procedures used to develop this document as well as those used for further maintenance are described in Part 1 ИСО/ИЕЦ директиве. Нарочито, треба обратити пажњу на различите критеријуме одобрења који су потребни за различите типове ИСО докумената. Овај документ је састављен у складу са уређивачким правилима Дел 2 ИСО/ИЕЦ директиве (види исо.орг/дирецтивес).

Please note that certain contents of this document may be subject to patent rights. ИСО није одговоран за идентификацију било ког или свих таквих патентних права. Details of any patent rights identified during the preparation of the document will be in the introduction and/or in the list of patent claims received by ISO (see iso.org/patents).

Any trade names used in this document are provided as information for the convenience of the user and do not constitute an endorsement.

For a description of the meaning of specific ISO terms and expressions related to conformity assessment, and information on ISO’s compliance with WTO principles in Technical Barriers to Trade (ТБТ), please refer to the following URL: Увод – Supplementary Information

The committee responsible for this document is ISO/TC 35, Боје и лакови, Subcommittee SC 9, General test methods for paints and varnishes.

The second edition removes and replaces the first edition (ИСО 4628-7:2003), which has been technically revised with the following changes:

а) Graphic reference standards for digital powder levels 1 до 5 have been copied from ISO 4628-6:2011;

б) Added normative reference to ISO 13076 for assessing lighting.

ИСО 4628 consists of the following sections under the general heading Paints and varnishments – Assessment of coating degradation – designation of the number and size of defects, and the intensity of uniform changes in appearance:

— Парт 1: General introduction and specifying the system

— Парт 2: Assessment of the degree of foaming

— Парт 3: Assessment of the degree of rust

Парт 4: Evaluation of the degree of cracking

— Парт 5: Assessment of the degree of peeling

— Парт 6: Assessing the degree of chalking by the tape method

— Парт 7: Assessing the degree of chalking by the velvet method

— Парт 8: Assessing the degree of delamination and corrosion around marking or other artificial defects

— Парт 10: Assessment of the degree of filamentous corrosion

ИСО 4628-7-2016 – Процена старења лакова и лакова – Процена броја и величине дефеката и интензитета уједначених промена изгледа – Парт 7: Assessment of the powder grade by the velvet method

1 Обим
Овај део ИСО-а 4628 specifies a method particularly suitable for assessing the degree of chalking of white or coloured outer coatings on rough surfaces and coating systems (тј. coatings with roughness greater than that of the reference comparator section G 4 as described in ISO 8503-1).

The specified test method can also be used to assess the degree of pulverization of coatings and coating systems on smooth surfaces, but for this purpose the method specified in ISO 4628-6:2011 is preferred.

The test method is applicable to paints and coating systems on mineral substrates, such as fiber cement, brick, concrete, and rendering, independent of surface structure. The method can be used very effectively by experienced operators and is recommended for laboratory and field evaluation.

Белешка 1 When a reference to the test method is included in the specification, the test conditions (тј. the aging method and the substrate) need to be agreed upon between the interested parties.

Белешка 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. But see the description of Table 1.

Белешка 3 For the number and size of defects, the intensity of changes in the appearance of the coating and the general principles of the system, please refer to the specified system of ISO 4628-1.

2 Normative references
The following documents are referred to normatively in whole or in part in this document and are required for their application. За датиране референце, примењује се само наведена верзија. For undated references, the new version of the reference (укључујући све ревизије) примењује.

ИСО 13076, Боје и лакови – Lighting and procedures for visual assessment of coatings

ИСО 4628-7-2016 – Процена старења лакова и лакова – Процена броја и величине дефеката и интензитета уједначених промена изгледа – Парт 7: Assessment of the powder grade by the velvet method

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

3.1 Pulverization

A loosely adhered fine powder appears on the surface of the film, which results from the degradation of one or more components

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