SIST EN ISO 8067:2027

• Abstract:

  This document specifies two methods for the determination of the tear strength of flexible cellular polymeric materials:; Method A, using a trouser test piece;; Method B, using an angle test piece without a nick.

• Status: Published
• Public Enquiry End Date: 30-Jul-2025
• Publication Date: 10-Nov-2026
• ICS: 83.100 - Cellular materials
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 09-Nov-2026
• Due Date: 14-Jan-2027
• Completion Date: 11-Nov-2026
• Ref Project: EN ISO 8067:2026 - Flexible cellular polymeric materials - Determination of tear strength (ISO 8067:2026)

• Revises: SIST EN ISO 8067:2018 - Flexible cellular polymeric materials - Determination of tear strength (ISO 8067:2018)
• Effective Date: 13-Mar-2024

SIST EN ISO 8067:2027 is the Slovenian adoption of ISO 8067 on flexible cellular polymeric materials, published by SIST. It specifies two methods for determining tear strength, using either a trouser test piece or an angle test piece without a nick, for laboratories, manufacturers, and buyers that need comparable results on foam materials.

What does SIST EN ISO 8067:2027 specify?

SIST EN ISO 8067:2027 specifies how to measure the tear strength of flexible cellular polymeric materials. The document is organized into clauses on scope, normative references, terms and definitions, apparatus, test pieces, number of test pieces, conditioning, procedure, expression of results, and the test report, plus one informative annex on precision.

The scope is limited to two test methods:

• Method A - trouser test piece
• Method B - angle test piece without a nick

Annex A gives a precision comparison between the two test-piece types. That matters in practice because users can judge which method fits their material and how the two approaches compare for repeatability and reproducibility.

What are the key requirements of SIST EN ISO 8067:2027?

SIST EN ISO 8067:2027 sets out a full laboratory method, from specimen preparation to reporting. The main requirements are about using the right test piece, conditioning the material properly, running the tensile test under controlled speed, and reporting the median result.

Apparatus and machine performance

SIST EN ISO 8067:2027 requires a tensile-testing machine that shows the force at rupture. The machine accuracy shall be class 2 or better as defined in ISO 7500-1. In practice, the force measurement must be good enough that the tear-strength result is not distorted by the machine itself.

Test pieces and orientation

SIST EN ISO 8067:2027 allows test pieces with or without skin, but they shall be free of voids and flow lines. If the material has a predominant foam-rise direction, the test piece orientation relative to that direction shall be controlled and, if not possible, stated in the report. This matters because foam structure can affect tearing and can change the result depending on cutting direction.

For method A, the document uses a rectangular trouser test piece with a defined cut. For method B, it uses an angle test piece cut from a sheet of material of 10 mm to 15 mm thickness. The shape of the specimen is part of the method, so results from different methods should not be mixed without care.

Number of specimens and conditioning

SIST EN ISO 8067:2027 requires three test pieces. Additional pieces may be needed if the spread of results is too large or if the tear does not progress properly. Materials are normally tested no less than 72 h after manufacture, with earlier testing allowed only under the conditions stated in Clause 7. The conditioning atmosphere is specified, so the material state is controlled before testing.

Test procedure

For method A, the test piece is clamped and torn at a jaw speed between 50 mm/min and 500 mm/min, with 50 mm/min used for referee purposes. The tear should travel about 25 mm, and the test piece is rejected if rupture happens too early. For method B, the test piece is clamped symmetrically and tested at the same general speed range, with 500 mm/min used for referee purposes. These speed limits matter because tear strength can vary with deformation rate.

Expression of results and report

SIST EN ISO 8067:2027 defines tear strength R as maximum force divided by original thickness, reported in N/cm. The result is the median of three values. If one or more values differs by more than 20 % from the median, two more test pieces are tested and the median of all five values is reported. The test report also records the material, test-piece type, conditioning, jaw speed, sample location, skin surfaces, thickness, result, deviations, and test date.

What terms does SIST EN ISO 8067:2027 define?

Clause 3 defines tear strength (R) as the maximum force per unit thickness observed when a test piece is stretched to rupture. In practical terms, it is the value the method is designed to measure.

A trouser test piece is the specimen used in method A, cut so that the tear propagates from the opened legs of the piece. It is used to produce a controlled tear path.

An angle test piece without a nick is the specimen used in method B, with a V-shaped geometry rather than a pre-cut nick. It is used to measure tear resistance with a different stress distribution.

The predominant foam-rise direction is the main cellular orientation in the material. The document uses it to control specimen alignment because directionality can influence tear results.

The conditioning atmosphere is the specified temperature and relative humidity before testing. It helps bring specimens to a defined state so results are more comparable between laboratories.

Who uses SIST EN ISO 8067:2027?

SIST EN ISO 8067:2027 is used by test laboratories, foam producers, quality-control staff, and technical buyers who need tear-strength data for flexible foam materials. It is also useful in specification checking, incoming inspection, product development, and dispute testing when the tear resistance of a material has to be measured in a consistent way.

What changed in SIST EN ISO 8067:2027 from the previous edition?

SIST EN ISO 8067:2027 replaces ISO 8067:2018 and is described as technically revised. The stated change is that clause 10 f) now includes the location and number of surfaces with skin.

Which standards are used with SIST EN ISO 8067:2027?

ISO 1923 provides the method for determining linear dimensions, which this standard uses to measure specimen thickness. ISO 7500-1 provides the calibration and verification basis for the tensile-testing machine force-measuring system.

Annex A also uses ISO/TR 9272 to calculate the precision data for the comparative trial. That gives users context for repeatability and reproducibility when comparing the two specimen types.

What does the SIST EN ISO 8067:2027 document contain?

The document contains the test apparatus requirements, specimen shapes, conditioning rules, test procedures for methods A and B, the calculation of tear strength, and the required contents of the test report. It also includes Figures 1 to 4, which show the test-piece shapes and the method A test arrangement. Annex A provides comparative precision data in Tables A.1 and A.2 for the two test-piece types, supported by a discussion of repeatability and reproducibility.

SLOVENSKI STANDARD
01-januar-2027
Mehki penjeni polimerni materiali - Ugotavljanje pretržne trdnosti (ISO 8067:2026)
Flexible cellular polymeric materials - Determination of tear strength (ISO 8067:2026)
Flexible Polymer-Schaumstoffe - Bestimmung des Weiterreißwiderstands (ISO
8067:2026)
Matériaux polymères alvéolaires souples - Détermination de la résistance au
déchirement (ISO 8067:2026)
Ta slovenski standard je istoveten z: EN ISO 8067:2026
ICS:
83.100 Penjeni polimeri Cellular materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 8067
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2026
EUROPÄISCHE NORM
ICS 83.100 Supersedes EN ISO 8067:2018
English Version
Flexible cellular polymeric materials - Determination of
tear strength (ISO 8067:2026)
Matériaux polymères alvéolaires souples - Flexible Polymer-Schaumstoffe - Bestimmung des
Détermination de la résistance au déchirement (ISO Weiterreißwiderstands (ISO 8067:2026)
8067:2026)
This European Standard was approved by CEN on 20 September 2025.

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 be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
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translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
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United Kingdom.
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COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8067:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 8067:2026) has been prepared by Technical Committee ISO/TC 45 "Rubber and
rubber products" in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of
which is held by SIS.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2027, and conflicting national standards shall be
withdrawn at the latest by April 2027.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 8067:2018.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 8067:2026 has been approved by CEN as EN ISO 8067:2026 without any modification.

International
Standard
ISO 8067
Fourth edition
Flexible cellular polymeric
2026-09
materials — Determination of tear
strength
Matériaux polymères alvéolaires souples — Détermination de la
résistance au déchirement
Reference number
ISO 8067:2026(en) © ISO 2026
ISO 8067:2026(en)
© ISO 2026
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ii
ISO 8067:2026(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 1
5 Test pieces . 2
5.1 General .2
5.2 Trouser test piece for method A .2
5.3 Angle test piece for method B .3
6 Number of test pieces . 4
7 Conditioning . 4
8 Procedure . 5
8.1 General .5
8.2 Method A .5
8.3 Method B .6
9 Expression of results . 6
10 Test report . 6
Annex A (informative) Precision comparison for the two types of test piece. 8
Bibliography .10

iii
ISO 8067:2026(en)
Foreword
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This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 4, Products (other than hoses), in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 8067:2018), which has been technically
revised.
The main change is as follows:
— addition of information regarding the location and number of surfaces with skin in Clause 10.
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.

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