ISO/TR 21555:2019 PDF

Name: ISO/TR 21555:2019 — Paints and varnishes - Overview of test methods on hardness and wear resistance of coatings
SKU: ISO/TR 21555:2019
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Paints and varnishes - Overview of test methods on hardness and wear resistance of coatings

Название (английский):

ISO/TR 21555:2019

Paints and varnishes - Overview of test methods on hardness and wear resistance of coatings

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 71
Дата публикации:: 14 августа 2019 г.
Издание:: ISO TR 21555 edition 1 version 1
ICS:: 87.040

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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.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO/TR 21555:2019 - Paints and varnishes: Overview of test methods on hardness and wear resistance of coatings is a technical report that helps users select the most suitable test methods for evaluating hardness and wear resistance of dry-film coatings. It summarizes a wide range of indentation, scratch and abrasion tests, describes typical procedure elements and limitations, and provides a compact annex (Annex A) with a summarized list of methods mapped to different mechanical stresses. Note: methods for testing cross‑linking (wear with solvents) and multiple‑impact abrasion are excluded.

Key topics and technical requirements

Scope & purpose: Guidance for choosing appropriate test methods rather than replacement of the detailed normative test standards.

Definitions & terminology: Uses ISO 4618 and other standardized terms (hardness, wear, stylus, scratch, abrasion, repeatability/reproducibility).

Hardness tests:

Indentation methods with resting indenters (e.g., Buchholz) and oscillating indenters.
Representative examples include Buchholz, Knoop, Pfund, Vickers. Procedures specify loading, dwell times and measurement approach (e.g., Buchholz indentation length measured after defined resting time; Knoop long‑diagonal used to calculate KHN).
Example precision data provided (Buchholz repeatability limit r = 0.23 mm, reproducibility R = 0.45 mm; Knoop repeatability ≈ 9%, reproducibility ≈ 24%).

Wear and abrasion tests:

Single‑scratch and multiple‑scratch tests with different stylus geometries (pencils, ball, conical, disc, U‑shaped).
Dry and wet abrasion tests (locked or rotating abrasive wheels, brushes, non‑woven media).
Falling‑sand tests (corundum, quartz sand).

Test conditions & influences:

Emphasizes visco‑elastic behaviour, film thickness, temperature and humidity influence results.
Recommends conditioning (examples: 23 °C / 50 % RH for defined durations) and performing tests in a climatic chamber when appropriate.

Evaluation: Typical reporting is mean values from multiple determinations and reference to the applicable normative standards for full procedures and calibration.

Practical applications - who uses this standard

Coatings manufacturers - method selection for product development and QC.

Test laboratories - planning appropriate mechanical tests and interpreting limitations.

R&D teams - comparing formulations and understanding mechanical failure modes.

Specifiers / procurement - selecting test requirements for tender/specs.

Standards writers & regulatory bodies - harmonizing test method references.

Related standards (referenced)

ISO 4618 (terms and definitions)

ISO 2815 (Buchholz test)

ISO 22557 (stylus terminology)

ISO 4545‑1, ASTM D1474 (Knoop references)

See Annex A of ISO/TR 21555:2019 for a concise mapping of methods to stress types.

Keywords: ISO TR 21555, coatings hardness test, wear resistance tests, Buchholz, Knoop, Vickers, scratch test, abrasion test, paint testing, coatings durability.

ISO/TR 21555:2019 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications - who uses this standard

Related standards (referenced)

Технические детали

SIST EN ISO 4618:2023

Paints and varnishes - Vocabulary (ISO 4618:2023)

SIST EN ISO 28158:2018

Dentistry - Integrated dental floss and handles (ISO 28158:2018)

SIST EN ISO 22557:2021

Paints and varnishes - Scratch test using a spring-loaded pen (ISO 22557:2019)

SIST EN ISO 4545-1:2023

Metallic materials - Knoop hardness test - Part 1: Test method (ISO 4545-1:2023)