SIST EN 12814-1:2026

SLOVENSKI STANDARD
01-februar-2026
Nadomešča:
SIST EN 12814-1:2001/AC:2003
Preskušanje zvarjenih spojev plastomernih polizdelkov - 1. del: Upogibni preskus
Testing of welded joints of thermoplastics semi-finished products - Part 1: Bend test
Prüfung von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 1:
Biegeversuch
Essai des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 1 :
Essai de pliage
Ta slovenski standard je istoveten z: EN 12814-1:2025
ICS:
25.160.40 Varjeni spoji in vari Welded joints and welds
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12814-1
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2025
EUROPÄISCHE NORM
ICS 25.160.40; 83.080.20 Supersedes EN 12814-1:1999
English Version
Testing of welded joints of thermoplastics semi-finished
products - Part 1: Bend test
Essai des assemblages soudés sur produits semi-finis Prüfung von Schweißverbindungen aus
en thermoplastiques - Partie 1 : Essai de pliage thermoplastischen Kunststoffen - Teil 1: Biegeversuch
This European Standard was approved by CEN on 26 October 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.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of 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
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12814-1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Symbols and designations . 5
5 Principle of the test . 5
6 Sampling procedures . 8
7 Dimensions of test specimens and test arrangement . 8
8 Cutting of test specimens . 9
8.1 General requirement . 9
8.2 Cutting of tubes . 9
9 Mechanical testing .10
10 Testing machine .11
11 Practical determination of bend angle .11
11.1 General.11
11.2 Method 1 .11
11.3 Method 2 .11
12 Test report .12
Annex A (informative) Manual test .13

European foreword
This document (EN 12814-1:2025) has been prepared by 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 June 2026, and conflicting national standards shall be
withdrawn at the latest by June 2026.
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 12814-1:1999.
— in Table 4, PA-U has been added;
— in Clause 12 “Test report”, added requirement to define the initial, final, bend or the ram position and
the bend angle or ram displacement.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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.
1 Scope
This document specifies the dimensions and the method for sampling and preparing test specimens,
together with the conditions for carrying out the bend test.
The result of the test is also influenced by the deformation behaviour of the tested material, the kind of
welding process and the geometry of the sample.
The test is applicable to plate and tube butt jointed assemblies made from thermoplastic materials filled
or unfilled, but not reinforced, irrespective of the welding process used. It is not applicable to assemblies
with a wall thickness < 3 mm.
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.
EN ISO 291, Plastics – Standard atmospheres for conditioning and testing(ISO 291)
ISO 2768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual
tolerance indications
ISO 2818, Plastics — Preparation of test specimens by machining
ISO 5893, Rubber and plastics test equipment — Tensile, flexural and compression types (constant rate of
traverse) — Specification
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
face bend
face corresponding to the open side of the groove is subjected to extension
3.2
root bend
face corresponding to the root of the weld is subjected to extension
3.3
side bend
one of the faces of the test specimen corresponding to the cross section of the weld is subjected to
extension
3.4
initial angle
α
i
angle betw
...