увод
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 тој комисији. Међународне владине и невладине организације које су у вези са ИСО такође су укључене у овај посао. ИСО блиско сарађује са Међународном електротехничком комисијом (ИЕЦ) о свим питањима електричне стандардизације.

Међународни стандарди се израђују у складу са правилима датим у ч 2 ИСО/ИЕЦ директиве.

Главни задатак техничког комитета је развој међународних стандарда. Нацрт међународног стандарда који је усвојио Технички комитет биће прослеђен телима чланицама на гласање. Објављивање као међународни стандард захтева одобрење најмање од стране 75% институција чланица.

ИСО 4628-6-2011 Assessment of the number and size of defects and the intensity of uniform changes in appearance in paints and varnishes coatings for ageing – Парт 6: Assessment of the degree of chalking by the tape method

Please note that certain elements of this document may be subject to patent rights. ИСО није одговоран за идентификацију било ког или свих таквих патената.

ИСО 4628-6 је развијен од стране Техничког комитета ИСО/ТЦ 35, Боје и лакови, Пододбор СЦ 9, General Test Methods for paints and varnishes.

The third edition cancels and replaces the technically revised second edition (ИСО 4628-6:2007). The main changes are as follows:

а) The graphic standard (photographic picture) used in the first edition (ИСО 4628-6:1990) has been reinserted because the computer-generated chalk scale used in the second edition (ИСО 4628-6:2007) does not always give the same rating as the scale used in the first edition (see introduction for more details);

б) Increased the limit of tape transmission, below which powdering is considered to have occurred (види 5.2).

ИСО 4628 consists of the following parts under the general heading: Боје и лакови – Assessment of coating degradation – Designation of the number and size of defects, and the intensity of uniform changes in appearance:

ИСО 4628-6-2011 Assessment of the number and size of defects and the intensity of uniform changes in appearance in paints and varnishes coatings for ageing – Парт 6: Assessment of the degree of chalking by the tape method

– Парт 1: General introduction and specification of the system

– Парт 2: Assessment of the degree of foaming

– Парт 3: Assessment of the degree of rust

– Парт 4: Evaluation of degree of cracking

– Парт 5: Assessment of the degree of spalling

– Парт 6: Evaluation of pulverization by tape method

– Парт 7: Evaluation of pulverization by velvet method

– Парт 8: Assessment of the degree of delamination and corrosion around lines or other artificial defects

– Парт 10: Assessment of the degree of filamentous corrosion

увести
ИСО 4628-1 defines a system for specifying the number and size of defects and the intensity of uniform variation of coatings, and Outlines the general principles for this system. The system is particularly suitable for defects caused by aging and weathering, as well as uniform changes, such as color changes, such as yellowing.

Other parts of ISO 4628 provide graphical standards or other methods for assessing specific types of defects. Build on existing evaluation plans wherever possible.

The chalk scale used in the first (1990) and third editions of ISO 4628-6 consists of a photographic picture of tape adhering to different numbers of pigment particles. The pigment particles are unevenly distributed on each piece of tape. Нарочито, lower ratings (i.e., 1 до 3) give the impression of being cloudy. Међутим, all five levels in the scale used in the first edition (1990) and this edition differ enough to allow for visual assessment.

ИСО 4628-6-2011 Assessment of the number and size of defects and the intensity of uniform changes in appearance in paints and varnishes coatings for ageing – Парт 6: Assessment of the degree of chalking by the tape method

The scale used in the second edition (2007) was computer generated. As a result, white dots representing pigment particles are distributed very evenly across the tape, and the results are not all ratings different enough from each other for visual evaluation. While ratings 0,5 до 3 on the black background of the 2007 grade can be well distinguished from each other, it is almost impossible to visually distinguish ratings above 3, 0, especially ratings 4 и 5. On a white background, the difference between ratings 0,5, 1,0, и 1,5 is not easy to discern. Међутим, the difference between ratings 1,5 и 5,0, is more pronounced.

Comparing the 1990 grade with the 2007 разред, a grade 1 in the 1990 grade appears to correspond to a grade 0.5 ин 2007, and a grade 2 in the 1990 grade corresponds to a grade 1 ин 2007.

Стога, it was decided that the 2007 Scale was not suitable for visually assessing the degree of paint powdering across the entire grade scale from 0,5 до 5,0.

Important – In order to assess the degree of pulverization by tape method, it is necessary to use the graphic reference standard included in this part of ISO 4628. Since electronic copies of these standards may change when viewed on screen or printed, it is recommended to use only the graphic standards included in printed copies of this part of ISO 4628 purchased from ISO member bodies or their distributors when comparing test results.

ИСО 4628-6-2011 Assessment of the number and size of defects and the intensity of uniform changes in appearance in paints and varnishes coatings for ageing – Парт 6: Assessment of the degree of chalking by the tape method

1 Домет
Овај део ИСО-а 4628 provides a graphical reference standard for specifying the degree of powderization of paint coatings. It also describes a method to assess the degree of pulverization. When using this method, care needs to be taken to distinguish between true degradation products and adhered dirt, especially in the case of slight powderization.

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

2.1 Pulverization

The surface of the paint coating appears to be loosely adhered to fine powder, which is caused by the degradation of one or more components

Јаван је само одељак са стандардним информацијама. Да бисте видели цео садржај, морате купити стандард преко званичних канала.