EN ISO 4628-6:2023 PDF

Paints and varnishes - Evaluation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 6: Assessment of degree of chalking by tape method (ISO 4628‑6:2023)

Название (английский):

EN ISO 4628-6:2023

Paints and varnishes - Evaluation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 6: Assessment of degree of chalking by tape method (ISO 4628‑6:2023)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 13
Дата публикации:: 25 октября 2023 г.
Издание:: CEN EN 4628 edition 2 version 1
ICS:: 87.040

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Описание (английский):

This document provides pictorial reference standards for designating the degree of chalking of paint coatings. It also describes a method by which the degree of chalking is rated. In using this method, it is essential that care be taken to distinguish between true degradation products and adhering dirt, particularly when chalking is slight.

Технические детали

Технический комитет: CEN/TC 139 - Paints and varnishes
SKU: EN ISO 4628-6:2023

Abstract

Overview

EN ISO 4628-6:2023 (also published as ISO 4628-6:2023) specifies a standardised tape method and pictorial reference standards for assessing the degree of chalking of paint and varnish coatings. Chalking is defined (ISO 4618:2023) as a surface change in the form of loose adherent powder produced by coating degradation. This fourth edition (2023) supersedes EN ISO 4628-6:2011 and is intended for consistent visual and instrumental evaluation of chalking after ageing or weathering.

Key topics and requirements

Pictorial reference standards: Printed photographic scales included in the standard must be used for visual comparison (electronic copies can vary and are not recommended).
Tape method principle: Chalking is lifted from the coating with an adhesive transparent tape and assessed against a contrasting background.
Materials:
- Self-adhesive transparent tape, minimum width 15 mm; tape type influences results and must be agreed between parties and reported.
- Matt black or white background (card or velvet) to provide best contrast.
Procedure highlights:
- Test surface must be dry at room temperature.
- Apply tape with firm pressure and rub; tape length at least 40 mm.
- Remove tape perpendicularly and place adhesive side down on chosen background (black for light coatings, white for dark).
- Assess immediately under consistent illumination and compare to pictorial scale.
- Distinguish true degradation (chalking) from adhering dirt, especially for slight chalking.
Instrumental option:
- Photoelectric measurement of tape transmittance vs unused tape is allowed if chalk residue is homogeneous.
- **Transmittance

Overview

Key topics and requirements

Pictorial reference standards: Printed photographic scales included in the standard must be used for visual comparison (electronic copies can vary and are not recommended).
Tape method principle: Chalking is lifted from the coating with an adhesive transparent tape and assessed against a contrasting background.
Materials:
- Self-adhesive transparent tape, minimum width 15 mm; tape type influences results and must be agreed between parties and reported.
- Matt black or white background (card or velvet) to provide best contrast.
Procedure highlights:
- Test surface must be dry at room temperature.
- Apply tape with firm pressure and rub; tape length at least 40 mm.
- Remove tape perpendicularly and place adhesive side down on chosen background (black for light coatings, white for dark).
- Assess immediately under consistent illumination and compare to pictorial scale.
- Distinguish true degradation (chalking) from adhering dirt, especially for slight chalking.
Instrumental option:
- Photoelectric measurement of tape transmittance vs unused tape is allowed if chalk residue is homogeneous.
- **Transmittance

EN ISO 4628-6:2023 PDF

Технические детали

Abstract

Overview

Key topics and requirements

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Abstract

Overview

Key topics and requirements

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