ISO 4628-4-2003 rus PDF

Full title and description

Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 4: Assessment of degree of cracking (ISO 4628-4:2003). This document defines a pictorial-comparison method and designation system for assessing cracking in organic and inorganic coating systems.

Abstract

ISO 4628-4:2003 describes a method for assessing the degree of cracking of coatings by visual comparison with pictorial reference standards and by using the designation system defined in ISO 4628-1. The procedure is intended for laboratory and field assessments of coating degradation caused by ageing, weathering and similar phenomena.

General information

• Status: Withdrawn / Superseded.
• Publication date: September 2003 (Edition 2).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 87.040 — Paints and varnishes.
• Edition / version: Edition 2 (2003).
• Number of pages: 13 (official ISO English edition length).

Scope

This part of ISO 4628 specifies a visual assessment method to determine the degree of cracking of coatings by comparing the coating surface with standardized pictorial examples and applying the designation rules from ISO 4628-1. It is intended to be used for defects resulting from ageing and weathering and for uniform changes in appearance where cracking is observed. The method provides a reproducible way to communicate crack severity for specification, quality control and reporting.

Key topics and requirements

• Use of pictorial reference standards for grading crack patterns and severities.
• Designation and reporting system consistent with ISO 4628-1.
• Defined grading steps for degree of cracking (visual categories and descriptions).
• Applicability to laboratory and field assessments of paints and varnishes.
• Guidance for reproducible visual comparison and documentation of results.

Typical use and users

Used by paint and coatings manufacturers, testing and quality-control laboratories, corrosion and maintenance engineers, specification writers, third‑party inspectors and researchers who need a standardized visual method to assess and report cracking in coating systems.

Related standards

ISO 4628-4 is part of the ISO 4628 series; related parts include ISO 4628-1 (general introduction and designation system) and other parts covering blistering, rusting, flaking, chalking and other degradation modes. The 2003 edition was later superseded by ISO 4628-4:2016, which should be consulted for the current method. Also commonly referenced alongside ISO 12944 (corrosion protection of steel structures) and other coating-test standards.

Keywords

cracking, coatings degradation, paints and varnishes, visual assessment, pictorial standards, ISO 4628, designation of defects, quality control

FAQ

Q: What is this standard?

A: ISO 4628-4:2003 is the part of the ISO 4628 series that specifies a visual, pictorial-comparison method for assessing the degree of cracking in coatings.

Q: What does it cover?

A: It covers the visual grading procedure and designation rules (using the system from ISO 4628-1) to assess cracking severity on painted or varnished surfaces, intended for both laboratory and field use.

Q: Who typically uses it?

A: Coatings manufacturers, test laboratories, inspectors, maintenance and corrosion engineers, and standards/specification authors who require a reproducible method to record and communicate cracking in coatings.

Q: Is it current or superseded?

A: ISO 4628-4:2003 has been withdrawn and superseded by ISO 4628-4:2016; users requiring the latest, authoritative procedure should consult the 2016 edition. (The 2003 edition was withdrawn when the revision was published.)

Q: Is it part of a series?

A: Yes — it is part of the ISO 4628 series on evaluation of degradation of coatings (other parts cover blistering, rusting, flaking, chalking, etc.).

Q: What are the key keywords?

A: Cracking; coatings degradation; pictorial standards; visual assessment; paints and varnishes; ISO 4628; designation of defects.