SIST-TP CEN ISO/TR 21555:2020 PDF

Paints and varnishes - Overview of test methods on hardness and wear resistance of coatings (ISO/TR 21555:2019)

Название (английский):

SIST-TP CEN ISO/TR 21555:2020

Paints and varnishes - Overview of test methods on hardness and wear resistance of coatings (ISO/TR 21555:2019)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 79
Дата публикации:: 21 октября 2020 г.
ICS:: 87.040
Технический комитет:: IBLP - Paints and varnishes

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Описание (английский):

This document provides an overview for selecting the most suitable test method regarding the evaluation of the hardness and the wear resistance of coatings. Annex A gives a summarized list of test methods for the evaluation of the hardness and of the wear resistance of coatings for different stresses. Methods for testing cross-linking (wear test in connection with solvents) and abrasion tests with multiple impacts are not covered by this document.

Технические детали

SKU: SIST-TP CEN ISO/TR 21555:2020

Abstract

Overview

SIST-TP CEN ISO/TR 21555:2020 (ISO/TR 21555:2019) is a technical report that provides an expert overview of test methods used to evaluate the hardness and wear resistance of coatings (paints and varnishes). It is intended as a guidance document to help users select the most suitable test method for different mechanical stresses. The report summarizes common laboratory techniques, highlights method-specific considerations and points to the detailed standards that specify test procedures.

Key topics and requirements

Purpose: overview and selection guidance rather than prescriptive, step-by-step test procedures. Detailed requirements remain in the referenced standards.
Scope notes:
- Covers a wide range of hardness and wear-resistance methods for coatings.
- Excludes methods for testing cross-linking (wear tests in connection with solvents) and abrasion tests involving multiple impacts.
- Annex A provides a summarized list of test methods mapped to different stress types.
Important technical considerations emphasized:
- Visco‑elastic behavior of coatings strongly affects results - timing between conditioning, testing and evaluation must be agreed and observed.
- Environmental conditions (temperature, humidity) influence mechanical properties; tests are preferably done in a climatic chamber after appropriate conditioning.
- Film thickness and operator expertise affect reproducibility and interpretation of results.
Representative methods indexed in the report (informative list):
- Hardness (indentation): Buchholz, Knoop, Pfund, Vickers.
- Oscillation/pendulum damping: König, Persoz, rocker methods.
- Wear/resistance: single-scratch (pencils, ball stylus, conical stylus, disc, U-shaped), multiple-scratch, dry and wet abrasion tests (locked/rotating abrasive wheels, scrub tests, non‑woven web), and falling‑sand tests.
Example numeric detail included: Buchholz indenter test uses a 500 g (~4.96 N) load for 30 s with indentation measured after 35 s (×20 microscope).

Practical applications and users

Who uses it:
- Coating manufacturers and formulators for R&D and product development.
- Independent test laboratories and QA/QC teams for method selection and interpretation.
- Specifiers and procurement engineers choosing appropriate performance tests for applications (industrial, automotive, protective, decorative).
- Standards committees and technical authors as a reference map to related methods.
How it helps:
- Guides selection of appropriate hardness and wear tests for specific service stresses.
- Alerts users to method limitations and factors affecting repeatability and reproducibility.
- Directs users to the normative detailed standards for execution and reporting.

Related standards

Normative reference within the report: ISO 4618 (Paints and varnishes - Terms and definitions).
Report prepared by ISO/TC 35 and adopted by CEN (CEN/TC 139) as CEN ISO/TR 21555:2020.
Annex A lists the specific test standards and methods to consult for detailed procedures.

Overview

Key topics and requirements

Purpose: overview and selection guidance rather than prescriptive, step-by-step test procedures. Detailed requirements remain in the referenced standards.
Scope notes:
- Covers a wide range of hardness and wear-resistance methods for coatings.
- Excludes methods for testing cross-linking (wear tests in connection with solvents) and abrasion tests involving multiple impacts.
- Annex A provides a summarized list of test methods mapped to different stress types.
Important technical considerations emphasized:
- Visco‑elastic behavior of coatings strongly affects results - timing between conditioning, testing and evaluation must be agreed and observed.
- Environmental conditions (temperature, humidity) influence mechanical properties; tests are preferably done in a climatic chamber after appropriate conditioning.
- Film thickness and operator expertise affect reproducibility and interpretation of results.
Representative methods indexed in the report (informative list):
- Hardness (indentation): Buchholz, Knoop, Pfund, Vickers.
- Oscillation/pendulum damping: König, Persoz, rocker methods.
- Wear/resistance: single-scratch (pencils, ball stylus, conical stylus, disc, U-shaped), multiple-scratch, dry and wet abrasion tests (locked/rotating abrasive wheels, scrub tests, non‑woven web), and falling‑sand tests.
Example numeric detail included: Buchholz indenter test uses a 500 g (~4.96 N) load for 30 s with indentation measured after 35 s (×20 microscope).

Practical applications and users

Who uses it:
- Coating manufacturers and formulators for R&D and product development.
- Independent test laboratories and QA/QC teams for method selection and interpretation.
- Specifiers and procurement engineers choosing appropriate performance tests for applications (industrial, automotive, protective, decorative).
- Standards committees and technical authors as a reference map to related methods.
How it helps:
- Guides selection of appropriate hardness and wear tests for specific service stresses.
- Alerts users to method limitations and factors affecting repeatability and reproducibility.
- Directs users to the normative detailed standards for execution and reporting.

Related standards

Normative reference within the report: ISO 4618 (Paints and varnishes - Terms and definitions).
Report prepared by ISO/TC 35 and adopted by CEN (CEN/TC 139) as CEN ISO/TR 21555:2020.
Annex A lists the specific test standards and methods to consult for detailed procedures.

SIST-TP CEN ISO/TR 21555:2020 PDF

Технические детали

Abstract

Overview

Key topics and requirements

Practical applications and users

Related standards

Похожие стандарты

Abstract

Overview

Key topics and requirements

Practical applications and users

Related standards

Похожие стандарты

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