ISO 6915:2019

Flexible cellular polymeric materials - Polyurethane foam for laminate use - Specification

This document specifies the minimum requirements for flexible polyurethane foams up to and including 20 mm thick intended for combination with suitable substrates such as non-woven, woven or knitted fabrics, to form a laminate. Three types of flexible polyurethane foam are specified as follows: - type 1: polyether; - type 2: polyester with minimum elongation at break of 200 %; - type 3: polyester with minimum elongation at break of 300 %.

Matériaux polymères alvéolaires souples — Mousse de polyuréthanne pour utilisation sous forme de feuilles pour assemblages — Spécifications

General Information

• Status: Published
• Publication Date: 22-Aug-2019
• ICS: 83.100 - Cellular materials
• Technical Committee: ISO/TC 45/SC 4 - Products (other than hoses)
• Drafting Committee: ISO/TC 45/SC 4/WG 8 - Flexible and semi-rigid cellular material
• Current Stage: 9093 - International Standard confirmed
• Start Date: 10-Jan-2025
• Completion Date: 13-Dec-2025

Relations

• Consolidated By: ISO 16826:2025 - Non-destructive testing - Ultrasonic testing - Testing for discontinuities perpendicular to the surface
• Effective Date: 28-Jan-2023
• Revises: ISO 6915:1991 - Flexible cellular polymeric materials - Polyurethane foam for laminate use - Specification
• Effective Date: 23-Apr-2020

Overview

ISO 6915:2019 - Flexible cellular polymeric materials - Polyurethane foam for laminate use - Specification - defines minimum requirements for flexible polyurethane foam up to 20 mm thick intended to be laminated to substrates (non‑woven, woven or knitted fabrics). The standard specifies three foam types by chemistry and mechanical performance:

• Type 1: polyether
• Type 2: polyester, elongation at break ≥ 200%
• Type 3: polyester, elongation at break ≥ 300%

ISO 6915:2019 includes appearance, dimensional tolerances, mechanical and aging performance, cell‑count and solvent‑swelling test methods (Annex A and Annex B), plus packaging and marking requirements.

Key topics and technical requirements

• Appearance and defects: Uniform cell network; free from flaws, stains and holes > 3 mm through thickness. Limits on number of 1.5–3 mm holes per 60 m2.
• Dimensions and tolerances: Nominal thickness agreed between parties; tolerances (examples):
  • < 4 mm: +0.3 / −0.2 mm
  • ≥ 4 mm: +0.5 / −0.3 mm Width and roll length tolerances are specified and agreed between purchaser and supplier.
• Apparent density: Measured per ISO 845; tolerance ±10% of the agreed nominal value.
• Cell count: Expressed as cells per 100 mm, determined by the method in Annex A; tolerance ±10% unless otherwise agreed.
• Mechanical performance (Table 3):
  • Initial tensile strength (kPa) minima: Type 1 = 100; Type 2 = 120; Type 3 = 160 (ISO 1798)
  • Initial elongation at break (%) minima: Type 1 & 2 = 200%; Type 3 = 300% (ISO 1798)
  • Retention after humidity and heat ageing (ISO 2440): tensile strength and elongation ≥ 80% of initial values.
• Solvent swelling (Annex B): Temporary and permanent swelling limits after immersion in perchloroethylene (or agreed solvent); detailed procedure and formulae provided.
• Packaging & marking: Manufacturer ID, batch number, nominal thickness/width/length, and ISO 6915 document/type must be marked.

Applications and practical value

ISO 6915:2019 is intended for specifying foams used as sheets for laminating with textiles and other substrates to produce laminated materials. Typical practical uses include quality control, material specification, supplier contracts and acceptance testing for laminated components in industries that require foam-to-fabric assemblies.

Who should use this standard

• Foam manufacturers and compounders
• Laminate and textile converters
• Product designers and specifiers
• Quality control and test laboratories
• Procurement and standards writers

Related standards

Normative references included in ISO 6915:2019:

• ISO 845 - Determination of apparent density
• ISO 1798 - Tensile strength and elongation at break
• ISO 1923:1981 - Determination of linear dimensions
• ISO 2440 - Accelerated ageing tests

Keywords: ISO 6915:2019, polyurethane foam, flexible cellular polymeric materials, foam for laminate use, polyether foam, polyester foam, tensile strength, elongation at break, cell count, solvent swelling, apparent density.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 6915
Third edition
2019-08
Corrected version
2020-04
Flexible cellular polymeric
materials — Polyurethane foam for
laminate use — Specification
Matériaux polymères alvéolaires souples — Mousse de polyuréthanne
pour utilisation sous forme de feuilles pour assemblages —
Spécifications
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Appearance . 1
5 Joints . 2
6 Odour . 2
7 Dimensions . 2
7.1 Thickness . 2
7.2 Width . 2
7.3 Length . 2
8 Apparent density . 3
9 Cell count . 3
10 Performance requirements . 3
11 Packaging and marking . 3
Annex A (normative) Measurement of cell count . 5
Annex B (normative) Measurement of solvent swelling . 7
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, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 4, Products other than hoses.
This third edition cancels and replaces the second edition (ISO 6915:1991), of which it constitutes a
minor revision.
The main changes compared to the previous edition are as follows:
— normative reference has been updated
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.
This corrected version of ISO 6915:2019 incorporates the following corrections:
— in B.6.1, the measurements have been corrected from "250 pm" to "250 μm";
— in B.7.2, the key description for h has been corrected from "the diameter of the test piece [.]" to
"the thickness of the test piece[.] ".
iv © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 6915:2019(E)
Flexible cellular polymeric materials — Polyurethane foam
for laminate use — Specification
1 Scope
This document specifies the minimum requirements for flexible polyurethane foams up to and including
20 mm thick intended for combination with suitable substrates such as non-woven, woven or knitted
fabrics, to form a laminate.
Three types of flexible polyurethane foam are specified as follows:
— type 1: polyether;
— type 2: polyester with minimum elongation at break of 200 %;
— type 3: polyester with minimum elongation at break of 300 %.
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 845, Cellular plastics and rubbers — Determination of apparent density
ISO 1798, Flexible cellular polymeric materials — Determination of tensile strength and elongation at break
ISO 1923:1981, Cellular plastics and rubbers — Determination of linear dimensions
ISO 2440, Flexible and rigid cellular polymeric materials — Accelerated ageing tests
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Appearance
4.1 The material shall consist of a uniform network of cells and shall be free from any flaws, stains and
other defects which might detrimentally affect the serviceability.
4.2 Material of thickness up to and including 6 mm shall lie flat when laid on a flat surface.
4.3 The material shall have no holes more than 3 mm in diameter through the full thickness of the
foam. The maximum number of holes of diameter between 1,5 mm and 3 mm in any 60 m2 of material
shall be not more than fo
...