ISO 4898:2025
(Main)Rigid cellular plastics — Thermal insulation products for buildings — Specifications
Rigid cellular plastics — Thermal insulation products for buildings — Specifications
This document specifies requirements and methods of testing for three categories of rigid cellular plastics thermal-insulation products for buildings. It covers rigid cellular plastics in the form of flat or profiled boards, with or without natural skins. They can also be faced or laminated with foil, plastic or metal films or sheets, mineral coatings, paper, cardboard, or other materials. This document is not applicable to materials used for the thermal insulation of pipes and vessels, for impact sound absorption or for acoustical insulation. This document covers the following cellular materials used in the thermal insulation of buildings: — PF based on phenolic polymer; — EPS based on expanded polystyrene; — XPS based on extruded polystyrene; — PUR based on polyurethane. The limiting quality values in this document are for use only in the specification of materials between purchaser and supplier.
Plastiques alvéolaires rigides — Produits d'isolation thermique pour bâtiments — Spécifications
General Information
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Standards Content (Sample)
International
Standard
ISO 4898
Seventh edition
Rigid cellular plastics — Thermal
2025-10
insulation products for buildings —
Specifications
Plastiques alvéolaires rigides — Produits d'isolation thermique
pour bâtiments — Spécifications
Reference number
© ISO 2025
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Sizes and dimensional tolerance requirements . 3
5 Physical-property requirements . 3
5.1 Categories.3
5.2 Subcategories .4
5.3 Limiting quality values .4
6 Sampling . 4
7 Conditioning . 4
7.1 Sample panels .4
7.2 Specimens .4
8 Test methods . 4
8.1 Bending load at break .4
8.2 Burning characteristics .5
8.3 Compressive creep at elevated temperature .5
8.4 Compressive strength .5
8.5 Density .5
8.6 Dimensional stability .5
8.7 Formaldehyde emissions .5
8.8 Heat release rate and smoke production rate .6
8.9 Linear dimensions .6
8.10 Thermal conductivity .6
8.10.1 General .6
8.10.2 Initial thermal conductivity .6
8.10.3 Long term thermal resistance .6
8.11 Water absorption .6
8.12 Water vapour permeability .6
9 Conformity control . 6
10 Labelling and marking of products . 7
11 Reporting requirements . 7
Annex A (normative) Amendments to ISO 12576-1 .11
Bibliography .13
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
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with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
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related to conformity assessment, as well as information about ISO's adherence to the World Trade
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This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular
plastics.
This seventh edition cancels and replaces the sixth edition (ISO 4898:2018), which has been technically
revised.
The main changes are as follows:
— the list of normative references (see Clause 2) has been updated;
— the test methods in Clause 8 have been completely revised;
— requirements for density testing have been added;
— requirements for initial thermal conductivity have been added;
— requirements for burning characteristics have been added;
— requirements for fire retardancy have been added;
— requirements for formaldehyde emissions have been added;
— requirement for testing to ISO 16000-25 has been added.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
This document provides a list of material properties for cellular plastic board-stock thermal insulation
materials, along with performance requirements and the test methods to determine the performance
requirements.
v
International Standard ISO 4898:2025(en)
Rigid cellular plastics — Thermal insulation products for
buildings — Specifications
1 Scope
This document specifies requirements and methods of testing for three categories of rigid cellular plastics
thermal-insulation products for buildings. It covers rigid cellular plastics in the form of flat or profiled
boards, with or without natural skins. They can also be faced or laminated with foil, plastic or metal films or
sheets, mineral coatings, paper, cardboard, or other materials.
This document is not applicable to materials used for the thermal insulation of pipes and vessels, for impact
sound absorption or for acoustical insulation.
This document covers the following cellular materials used in the thermal insulation of buildings:
— PF based on phenolic polymer;
— EPS based on expanded polystyrene;
— XPS based on extruded polystyrene;
— PUR based on polyurethane.
The limiting quality values in this document are for use only in the specification of materials between
purchaser and supplier.
2 Normative references
The following documents are referred to in the text in such a way that some or all 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 291, Plastics — Standard atmospheres for conditioning and testing
ISO 844, Rigid cellular plastics — Determination of compression properties
ISO 845, Cellular plastics and rubbers — Determination of apparent density
ISO 21723, Buildings and civil engineering works — Modular coordination — Module
ISO 1209-1, Rigid cellular plastics — Determination of flexural properties — Part 1: Basic bending test
ISO 1663, Rigid cellular plastics — Determination of water vapour transmission properties
ISO 1923, Cellular plastics and rubbers — Determination of linear dimensions
ISO 2796, Cellular plastics, rigid — Test for dimensional stability
ISO 2896, Rigid cellular plastics — Determination of water absorption
ISO 5660-1, Reaction-to-fire tests — Heat release, smoke production and mass loss rate — Part 1: Heat release
rate (cone calorimeter method) and smoke production rate (dynamic measurement)
ISO 7850, Cellular plastics, rigid — Determination of compressive creep
ISO 8301, Thermal insulation — Determination of steady-state thermal resistance and related properties —
Heat flow meter apparatus
ISO 8302, Thermal insulation — Determination of steady-state thermal resistance and related properties —
Guarded hot plate apparatus
ISO 9772, Cellular plastics — Determination of horizontal burning characteristics
...
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