ISO 22627:2026

• Abstract:

  This document specifies the technical requirements for painting the accommodation interior structured by steel on passenger ships, including ferries, cruise ships and ocean liners. The requirements in this document cover primary surface preparation, protective paint system, secondary surface preparation, inspection and testing. This document is applicable to painting the accommodation interior excluding the floor of passenger ships. It can also be used as a reference for other ships which are not passenger ships but which have accommodation structured by steel.

• Status: Published
• Publication Date: 02-Aug-2026
• ICS: 25.220.10 - Surface preparation
• ICS: 47.020.80 - Accommodation spaces
• ICS: 87.040 - Paints and varnishes
• Technical Committee: ISO/TC 8/SC 8 - Ship design
• Drafting Committee: ISO/TC 8/SC 8 - Ship design
• Current Stage: 6060 - International Standard published
• Start Date: 03-Aug-2026
• Due Date: 11-Sep-2026
• Completion Date: 03-Aug-2026

ISO 22627:2026 is an ISO International Standard for painting the steel accommodation interior of passenger ships, including ferries, cruise ships and ocean liners. It specifies surface preparation, paint system selection, inspection and testing so the accommodation areas can be protected against corrosion while meeting interior coating needs.

What does ISO 22627:2026 specify?

ISO 22627:2026 specifies technical requirements for painting the accommodation interior structured by steel on passenger ships. It applies to the accommodation interior excluding the floor, and it can also be used as a reference for other non-passenger ships with steel-structured accommodation.

The document is organized into clauses for scope, normative references, terms and abbreviations, primary surface preparation, protective paint system, secondary surface preparation, paint requirements, and inspection and testing. It also includes a bibliography for related methods and background documents.

What are the key requirements of ISO 22627:2026?

ISO 22627:2026 sets a step-by-step coating approach: prepare the steel, select the paint system by area, apply secondary preparation, then inspect and test the coating. In practice, this means the coating plan has to match both the surface condition and whether the area is classed as cold or warm.

Surface preparation and primer

Clause 5 requires blast-cleaning to Sa2½ in accordance with ISO 8501-1, with a surface roughness between 30 μm and 75 μm unless the paint manufacturer recommends otherwise. It also calls for one coat of inorganic zinc silicate shop primer, with dry film thickness on smooth bare steel in the stated range or as recommended by the manufacturer. This matters because the final coating performance depends on a clean, correctly profiled steel surface and a sound primer.

Paint system selection by area

Clause 6 requires EP, AK or ESI paint to be selected for the cold area and warm area according to the surface type. The cold area and warm area are treated differently, and the document allows other paint systems only if they give equivalent corrosion prevention performance. For a reader, this means the coating specification cannot be copied blindly from one space to another.

Secondary surface preparation

Clause 7 requires structural surface treatment at least to Grade P1 as specified in ISO 8501-3. In the cold area, steel substrates require minimum St2 cleaning to ISO 8501-1. In the warm area, invisible steel surfaces are cleaned of oil stains, loose rust and other pollutants, while visible steel surfaces require minimum St2. This helps the coater target the visible and hidden steel appropriately.

Paint performance and safety

Clause 8 requires paints to provide decoration, corrosion resistance and low flame-spread performance, and they may be single-pack or two-pack materials. The film must dry and cure at ambient temperature, be suitable for brush, roller or spray application, and form a smooth, uniform film without sagging. The clause also requires salt spray resistance, drying performance and heavy metal limits, and it prohibits asbestos. In practice, the paint supplier’s technical data sheet becomes part of the working specification.

Inspection and environmental control

Clause 9 requires inspection and testing of paint systems using ISO 8502-4 for environmental conditions, ISO 2808 for film thickness, and visual examination for curing, contamination, solvent retention, pinholes/popping and sagging. Coating application must be done under controlled humidity and surface conditions, and not when relative humidity is above 85% or the surface is less than 3 °C above the dew point. This gives the buyer or inspector clear acceptance conditions before the coating is accepted.

What terms does ISO 22627:2026 define?

ISO 22627:2026 defines accommodation interior as the internal space of a compartment used to accommodate passengers and crew members. This is the area the standard is written for.

An invisible surface is steel hidden by decoration panels, rock wool or similar covering. The distinction matters because some coating choices differ between visible and hidden steel.

The cold area of accommodation interior is the zone extending 500 mm inward from the outer wall and 500 mm inward from the weather deck, with corrosivity up to C2. The warm area of accommodation interior is the rest of the accommodation interior.

A technical data sheet is the paint manufacturer’s product data sheet with technical instructions and application information. A paint system is the total set of paints or related products applied to a substrate.

The abbreviations AK, EP, ESI and NDFT mean alkyd, epoxy, ethyl silicate and nominal dry film thickness. These terms are used throughout the coating specification and thickness requirements.

Who uses ISO 22627:2026?

ISO 22627:2026 is used by shipbuilders, coating contractors, paint manufacturers, ship owners, quality managers and inspection personnel. It helps them specify interior coating work, verify steel preparation, select a compatible paint system, and check that the finished coating meets the required application and test conditions.

It is most relevant in passenger ship construction and outfitting, especially where accommodation spaces have steel structure and where controlled coating work is needed to reduce corrosion and avoid contamination during construction.

Which standards are used with ISO 22627:2026?

ISO 22627:2026 cites ISO 8501-1 and ISO 8501-3 for visual assessment of steel cleanliness and preparation grades. It uses these standards to define how clean and how well prepared the steel must be before coating.

It cites ISO 9117-1 and ISO 9117-3 for drying tests, ISO 9227 for salt spray testing, ISO 8502-4 for assessing condensation risk before paint application, and ISO 2808 for film thickness measurement. These references supply the test methods behind the coating acceptance checks.

What does the ISO 22627:2026 document contain?

ISO 22627:2026 contains one figure that explains the cold area and warm area, and four main tables covering paint systems, paint test requirements, heavy metal limits and inspection/testing. The tables are used to select coating systems, check drying and corrosion resistance, and confirm the coating meets environmental and thickness criteria.

The bibliography points readers to related coating and surface-preparation standards, including environment classification, surface contamination methods, roughness assessment, density, flash point, adhesion and fire test procedures. This makes the document usable as a working specification for design, coating application, inspection and acceptance.

International
Standard
ISO 22627
First edition
Ships and marine technology —
2026-08
Technical requirements for painting
the accommodation interior of
passenger ships
Reference number
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviations . 3
5 Primary surface preparation . 3
6 Protective paint system . 3
7 Secondary surface preparation . 4
7.1 General .4
7.2 Cold area .4
7.3 Warm area .4
8 Requirements for paints . 4
8.1 General .4
8.2 Low flame-spread and harmful substance requirements .4
9 Inspection and testing . 5
Bibliography . 6

iii
Foreword
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This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee
SC 8, Ship design.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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iv
Introduction
Passenger ships have large accommodation areas, which is a difficult part of the entire passenger ship
construction. It is especially challenging to effectively control the painting process of the accommodation
areas in terms of grinding and dust to avoid polluting.
This document provides technical requirements for the primary surface preparation and paint system of
steel in passenger ship accommodation areas based on corrosion rate and combined with the corrosion
environment of the accommodation areas.
The technology specified in this document requires the division of cold and warm area as the basis. Through
the control of intact workshop primer, a differentiated coating method for the accommodation area can be
established to meet the anti-corrosion requirements of the accommodation area while conforming to the
requirements of ship construction work.

v
International Standard ISO 22627:2026(en)
Ships and marine technology — Technical requirements for
painting the accommodation interior of passenger ships
1 Scope
This document specifies the technical requirements for painting the accommodation interior structured by
steel on passenger ships, including ferries, cruise ships and ocean liners. The requirements in this document
cover primary surface preparation, protective paint system, secondary surface preparation, inspection and
testing.
This document is applicable to painting the accommodation interior excluding the floor of passenger ships. It
can also be used as a reference for other ships which are not passenger ships but which have accommodation
structured by steel.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 8501-1, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and
of steel substrates after overall removal of previous coatings
ISO 8501-3, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 3: Preparation grades of welds, edges and other areas with surface
imperfections
ISO 9117-1, Paints and varnishes — Dryi
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