ISO 4624:2023
Paints and varnishes — Pull-off test for adhesion
Paints and varnishes — Pull-off test for adhesion
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 12
- Дата публикации:
- 12 июня 2023 г.
- Издание:
- ISO IS 4624 edition 4 version 1
- ICS:
- 87.040
This document specifies three methods for determining the adhesion by carrying out a pull-off test on a single coating or a multi-coat system of paint, varnish or related product. These methods include: — method A: using two dollies, suitable for testing both rigid and deformable substrates; — method B: testing from one side only, using a single dolly, suitable for rigid substrates only; — method C: using dollies, one as a painted substrate. These test methods have been found useful in comparing the adhesion behaviour of different coatings. It is most useful in providing relative ratings for a series of coated panels exhibiting significant differences in adhesion. The test can be applied using a wide range of substrates. Different procedures are given according to whether the substrate is deformable, e.g. thin metal, plastics and wood, or rigid, e.g. thick concrete and metal plates. To avoid distortion of the substrate during the tensile test, it is common to use a sandwich construction. For example, for special purposes, the coating can be applied directly to the face of a test dolly.
Abstract
Overview
ISO 4624:2023 - Paints and varnishes - Pull-off test for adhesion specifies three standardized pull-off methods to determine the adhesion of a single coating or multi-coat system. The test measures the minimum tensile stress required to detach or rupture a coating perpendicular to the substrate. It is designed for use across a wide range of substrates (rigid and deformable) and is valuable for comparing adhesion behaviour and providing relative ratings for coated panels.
Key topics and technical requirements
- Three methods
- Method A: Two-dolly (general) method - suitable for both rigid and deformable substrates.
- Method B: Single-dolly method - one-sided testing suitable for rigid substrates only; smaller dollies (e.g., 7 mm) can be used to avoid substrate distortion.
- Method C: Dolly-as-painted-substrate method - a dolly acts as a painted substrate.
- Apparatus
- Tensile tester that applies axial tensile stress perpendicular to the coating; rate not greater than 1 MPa/s and failure should occur within 90 s.
- Dollies (nominal 20 mm diameter recommended; 7 mm or up to 100 mm for concrete as applicable). Dollies must have flat machined faces and adequate thickness.
- Centring device for coaxial alignment and a cutting device for cutting around dollies when specified.
- Adhesives
- Adhesive selection is critical: adhesive cohesive/bonding strength should exceed that of the coating or substrate to ensure failure occurs in the test assembly component of interest.
- Specimen preparation
- Results
- Reported as breaking strength (tensile stress) and nature of fracture (adhesive, cohesive or mixed). Test report shall identify instrument type, dolly diameter, adhesives and other conditions.
Applications and users
- Useful for quality control, product development, comparative testing and specification compliance of paints, varnishes and related coatings.
- Typical users: coating manufacturers, independent test laboratories, specifiers, corrosion engineers, civil/structural contractors, and R&D teams assessing adhesion to metals, plastics, wood, concrete and other substrates.
- Particularly helpful when ranking coatings that show significant differences in adhesion.
Related standards
- ISO 2409 (adhesion by cross-cut test) - complementary evaluation.
- Normative references: ISO 1513, ISO 1514, ISO 2808, ISO 3270, ISO 4618, ISO 15528 - for sampling, panel prep, conditioning and terminology.
Keywords: ISO 4624:2023, pull-off test, paint adhesion test, coating adhesion, dollies, tensile tester, paints and varnishes.
Технические детали
- Технический комитет
- ISO/TC 35/SC 9 - General test methods for paints and varnishes
- SKU
- ISO 4624:2023
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