SIST EN ISO 8501-4:2020

Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 4: Initial surface conditions, preparation grades and flash rust grades in connection with water jetting (ISO 8501-4:2020)

This document specifies a series of preparation grades for steel surfaces after removal/partial removal of water-soluble contaminants, rust, previous paint coatings and other foreign matter by high-pressure water jetting. The various grades are defined by written descriptions together with photographs that are representative examples within the tolerances for each grade as described in words.
This document specifies both initial surface conditions and after-cleaning flash rust grades, also defined by written descriptions together with representative photographic examples.
This document applies the cleanliness of the surface to its visual appearance.
Consideration in addition to visual appearance is given to invisible contaminants and roughness or profile. Physical and chemical methods for testing for soluble salts and other invisible contaminants on the visually clean surface are found in the ISO 8502 series. The roughness or profile characteristics of the surface are found in the ISO 8503 series.

Vorbereitung von Stahloberflächen vor dem Auftragen von Beschichtungsstoffen - Visuelle Beurteilung der Oberflächenreinheit - Teil 4: Ausgangszustände, Vorbereitungsgrade und Flugrostgrade in Verbindung mit Hochdruck-Wasserwaschen (ISO 8501-4:2020)

Dieses Dokument legt eine Reihe von Vorbereitungsgraden von Stahloberflächen nach Entfernen/teilweisem Entfernen von wasserlöslichen Verunreinigungen, Rost und alten Beschichtungen sowie artfremden Verunreinigungen durch Hochdruck-Wasserwaschen fest. Die einzelnen Grade sind durch Beschreibungen und photographische Vergleichsmuster definiert, wobei jedes Vergleichsmuster ein repräsentatives Beispiel für den Bereich darstellt, der von der Beschreibung erfasst wird.
Dieses Dokument legt sowohl Ausgangszustände als auch Flugrostgrade nach dem Reinigen fest, die gleichfalls durch Beschreibungen und repräsentative photographische Beispiele definiert sind.
Nach diesem Dokument wird die Reinheit einer Oberfläche nach ihrem Aussehen beurteilt.
Zusätzlich zum äußeren Erscheinungsbild werden nicht sichtbare Verunreinigungen und die Rauheit oder Profilierung berücksichtigt. Physikalische und chemische Prüfverfahren für lösliche Salze und andere nicht sichtbare Verunreinigungen auf der sichtbar sauberen Oberfläche sind in der Normenreihe ISO 8502 enthalten. Die Rauheits  oder Profilkennwerte der Oberfläche sind in der Normenreihe ISO 8503 enthalten.
ACHTUNG - Die in diesem Dokument dargestellten Referenzphotographien können weder auf dem Bildschirm noch im Ausdruck wirklichkeitsgetreu wiedergegeben werden. Es ist wichtig, dass bei der Durchführung von Begutachtungen nur die photographischen Vergleichsmuster in offiziell gedruckten Versionen dieses Dokuments verwendet werden, die von der ISO oder von ISO Mitgliedsorganisationen oder deren Vertreibern erworben wurden.

Préparation des subjectiles d'acier avant application de peintures et de produits assimilés - Évaluation visuelle de la propreté d'un subjectile - Partie 4: États de surface initiaux, degrés de préparation et degrés de fleurette de rouille après décapage à l'eau sous haute pression (ISO 8501-4:2020)

Le présent document spécifie une série de degrés de préparation des subjectiles d'acier après décapage total ou partiel à l'eau sous haute pression des agents contaminants solubles dans l'eau, de la rouille, des couches de peinture antérieures et d'autres matières étrangères. Les différents degrés font l'objet d'une description écrite accompagnée de clichés photographiques qui constituent des exemples représentatifs dans les limites des tolérances pour chacun des degrés décrits.
De plus, ce document spécifie à la fois les états de surface initiaux et les degrés de fleurette de rouille après décapage, également définis par des descriptions écrites accompagnées de clichés photographiques représentatifs.
Le présent document fait le lien entre la propreté du subjectile et son aspect visuel.
Outre l'aspect visuel, il traite également des contaminants invisibles et de la rugosité de surface. Les méthodes physico-chimiques d'analyse des sels solubles et des autres contaminants invisibles sur un subjectile visiblement propre sont issues de la série ISO 8502. Les caractéristiques de rugosité de surface du subjectile sont elles issues de la série ISO 8503.

Priprava jeklenih podlag pred nanašanjem barv in sorodnih premazov - Vizualno ocenjevanje čistosti površine - 4. del: Začetno stanje površine, stopnje priprave in stopnje površinske korozije v povezavi z visokotlačnim vodnim brizganjem (ISO 8501-4:2020)

General Information

• Status: Published
• Public Enquiry End Date: 03-Jul-2019
• Publication Date: 10-Nov-2020
• ICS: 25.220.10 - Surface preparation
• ICS: 87.020 - Paint coating processes
• Technical Committee: IBLP - Paints and varnishes
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 06-Nov-2020
• Due Date: 11-Jan-2021
• Completion Date: 11-Nov-2020
• Ref Project: EN ISO 8501-4:2020 - Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 4: Initial surface conditions, preparation grades and flash rust grades in connection with water jetting (ISO 8501-4:2020)

Relations

• Replaces: SIST EN ISO 8501-4:2007 - Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 4: Initial surface conditions, preparation grades and flash rust grades in connection with high-pressure water jetting (ISO 8501-4:2006)
• Effective Date: 01-Dec-2020
• Referred By: SIST EN 1090-2:2008+A1:2012 - Execution of steel structures and aluminium structures - Part 2: Technical requirements for steel structures
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 1090-2:2018+A1:2024 - Execution of steel structures and aluminium structures - Part 2: Technical requirements for steel structures
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 1090-2:2018 - Execution of steel structures and aluminium structures - Part 2: Technical requirements for steel structures
• Effective Date: 28-Jan-2026

Overview

SIST EN ISO 8501-4:2020 establishes standardized guidelines for the preparation of steel substrates before applying paints and coatings. It focuses on the visual assessment of surface cleanliness after high-pressure water jetting processes. The standard defines initial surface conditions, preparation grades, and flash rust grades using written descriptions and representative photographs, ensuring consistent and reliable evaluation of steel substrates' readiness for coating.

Adhering to this standard is critical for achieving optimal adhesion, durability, and performance of protective coatings in industrial and construction contexts. It was developed collaboratively by international experts within ISO and CEN committees, aligning global best practices in surface preparation.

Key Topics

• Visual Assessment of Cleanliness
  Describes how to inspect steel surfaces visually after the removal of impurities such as water-soluble contaminants, rust, previous paint, and other foreign matter using high-pressure water jetting.

• Initial Surface Conditions
  Outlines defined degrees of cleanliness and the starting state of steel surfaces before further preparation or coating.

• Preparation Grades
  Specifies different levels of cleaning achieved by water jetting and how these grades impact coating performance.

• Flash Rust Grades
  Defines the visual grades for flash rust appearing after water jetting, supported by detailed written descriptions and photographic references.

• Comparison and Verification
  Provides comparative visual examples to objectively assess surface preparation, enhancing communication and agreement between all project stakeholders.

• Complementary Considerations
  Notes the importance of invisible contaminants (e.g., soluble salts) and surface roughness, which are assessed using other standards (ISO 8502 and ISO 8503 series).

Applications

SIST EN ISO 8501-4:2020 is widely used in industries where protective paints and coatings are applied to steel structures. Its practical applications include:

• Infrastructure and Construction
  Ensures bridges, pipelines, and steel frameworks are properly prepared before coating application, minimizing premature failures and maintenance costs.

• Shipbuilding and Offshore Engineering
  Helps control surface preparation for marine vessels and platforms, where corrosion resistance is vital.

• Industrial Plant Maintenance
  Guides refurbishment and re-coating of tanks, equipment, and structural steel, extending service life and maintaining safety.

• Oil, Gas, and Petrochemical Facilities
  Assists in preparing steel surfaces exposed to harsh environments, providing a benchmark for contractors and inspectors.

Following this standard supports consistent project outcomes, facilitates quality assurance, and strengthens communication among engineers, contractors, and asset owners regarding surface preparation requirements.

Related Standards

• ISO 8501 Series
  Comprehensive guidance on visual assessment of surface cleanliness for various preparation methods.
• ISO 8502 Series
  Methods for testing soluble salts and invisible contaminants on cleaned surfaces.
• ISO 8503 Series
  Measurement of surface roughness and profile, important for coating adhesion.
• ISO 12944
  General standard for protective paint systems used on steel structures, referencing surface preparation as a key element.

Utilizing SIST EN ISO 8501-4:2020 alongside these related standards helps ensure high-quality surface preparation and maximizes the long-term performance of protective coating systems. Proper implementation of surface cleanliness assessment directly contributes to the integrity and lifespan of steel infrastructures globally.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2020
Nadomešča:
SIST EN ISO 8501-4:2007
Priprava jeklenih podlag pred nanašanjem barv in sorodnih premazov - Vizualno
ocenjevanje čistosti površine - 4. del: Začetno stanje površine, stopnje priprave in
stopnje površinske korozije v povezavi z visokotlačnim vodnim brizganjem (ISO
8501-4:2020)
Preparation of steel substrates before application of paints and related products - Visual
assessment of surface cleanliness - Part 4: Initial surface conditions, preparation grades
and flash rust grades in connection with water jetting (ISO 8501-4:2020)
Vorbereitung von Stahloberflächen vor dem Auftragen von Beschichtungsstoffen -
Visuelle Beurteilung der Oberflächenreinheit - Teil 4: Ausgangszustände,
Vorbereitungsgrade und Flugrostgrade in Verbindung mit Hochdruck-Wasserwaschen
(ISO 8501-4:2020)
Préparation des subjectiles d'acier avant application de peintures et de produits
assimilés - Évaluation visuelle de la propreté d'un subjectile - Partie 4: États de surface
initiaux, degrés de préparation et degrés de fleurette de rouille après décapage à l'eau
sous haute pression (ISO 8501-4:2020)
Ta slovenski standard je istoveten z: EN ISO 8501-4:2020
ICS:
25.220.10 Priprava površine Surface preparation
87.020 Postopki za nanašanje Paint coating processes
barvnih premazov
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 8501-4
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2020
EUROPÄISCHE NORM
ICS 25.220.10 Supersedes EN ISO 8501-4:2006
English Version
Preparation of steel substrates before application of paints
and related products - Visual assessment of surface
cleanliness - Part 4: Initial surface conditions, preparation
grades and flash rust grades in connection with water
jetting (ISO 8501-4:2020)
Préparation des subjectiles d'acier avant application de Vorbereitung von Stahloberflächen vor dem Auftragen
peintures et de produits assimilés - Évaluation visuelle von Beschichtungsstoffen - Visuelle Beurteilung der
de la propreté d'un subjectile - Partie 4: États de Oberflächenreinheit - Teil 4: Ausgangszustände,
surface initiaux, degrés de préparation et degrés de Vorbereitungsgrade und Flugrostgrade in Verbindung
fleurette de rouille après décapage à l'eau sous haute mit Hochdruck-Wasserwaschen (ISO 8501-4:2020)
pression (ISO 8501-4:2020)
This European Standard was approved by CEN on 25 July 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may
...