EN 12814-6:2026

• Abstract:

  This document specifies the dimensions, the method of sampling and the preparation of the test specimens, also the conditions for performing the low temperature tensile test perpendicular to the weld in order to determine the low temperature tensile welding factor.; A low temperature tensile test can be used in conjunction with other tests (e.g. bend, tensile creep, macro) to assess the performance of welded assemblies, made from thermoplastics materials.; The low temperature tensile welding factor and the appearance of the fracture surface provide a guide regarding the ductility of the joint and the quality of the work.; This document is applicable to co-axial or co-planar welded assemblies made from thermoplastics materials filled or unfilled, but not reinforced, irrespective of the welding process used.; This document does not apply to co-axial welded assemblies of an external diameter less than 20 mm.

• Status: Not Published
• Publication Date: 15-Sep-2026
• ICS: 25.160.40 - Welded joints and welds
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249/WG 16 - Welding of thermoplastics
• Current Stage: 5060 - Closure of Vote - Formal Approval
• Start Date: 25-Jun-2026
• Due Date: 14-Sep-2026
• Completion Date: 25-Jun-2026
• Ref Project: kSIST FprEN 12814-6:2026 - Testing of welded joints of thermoplastics semi-finished products - Part 6: Low temperature tensile test

• Revises: EN 12814-6:2000 - Testing of welded joints of thermoplastics semi-finished products - Part 6: Low temperature tensile test
• Effective Date: 07-Aug-2024

Overview

EN 12814-6:2026 is a European Standard developed by CEN for testing welded joints of thermoplastics semi-finished products, specifically addressing the low temperature tensile test. This standard prescribes methods for specimen sampling, preparation, and testing conditions to determine the low temperature tensile welding factor. The test is conducted perpendicular to the weld to evaluate the ductility and quality of welded assemblies under low temperature conditions.

This part of the EN 12814 series is applicable to co-axial or co-planar welded assemblies made from filled or unfilled thermoplastics, regardless of the welding process used. It excludes reinforced materials and co-axial assemblies with an external diameter below 20 mm.

Adhering to EN 12814-6:2026 ensures consistent, reliable testing for manufacturers, testing laboratories, and quality assurance professionals in plastics processing and welding industries.

Key Topics

• Test Scope: Defines applicability to welded thermoplastics, specimen dimensions, and testing exclusions.
• Specimen Preparation: Outlines the procedures for sampling, cutting, and marking welded and unwelded test specimens to ensure traceability and representativeness.
• Test Execution: Details requirements for conditioning, temperature control, and mechanical testing, including the number of specimens and variables like temperature and tensile speed.
• Low Temperature Tensile Welding Factor: Specifies the method for calculating the welding factor, based on the ratio of stresses in welded and unwelded specimens, to assess joint quality.
• Reporting: Lists mandatory items for test reporting, including specimen characteristics, testing conditions, measured forces and stresses, and fracture surface appearance.
• Quality Assessment: Emphasizes visual and mechanical criteria to guide ductility and work quality evaluation based on fracture appearance.

Applications

EN 12814-6:2026 is critical for industries and professionals involved in the welding and fabrication of thermoplastics. Key practical applications include:

• Quality Control: Manufacturers use the standard to validate welded joints in thermoplastic pipes, plates, and semi-finished products.
• Research & Development: Testing new joint designs or evaluating performance of thermoplastic welds under extreme conditions.
• Inspection & Certification: Third-party laboratories and certifying bodies apply the method to ensure compliance with product requirements and regulatory expectations.
• Material Comparison: Enables comparison between different thermoplastic materials, filler types, and welding techniques.
• Failure Analysis: The analysis of fracture surfaces helps identify welding or material-related defects.

By following EN 12814-6:2026, stakeholders ensure consistency, reliability, and comparability in tensile testing at low temperatures, which is crucial for safety and performance, especially in critical applications such as piping systems for water, gas, or chemicals.

Related Standards

For comprehensive weld testing of thermoplastics, the following related standards should also be considered:

• EN 12814-1 to EN 12814-7 - Series covering additional mechanical and non-destructive tests of welded joints in thermoplastics.
• EN ISO 291 - Plastics - Standard atmospheres for conditioning and testing.
• EN 13100-1 - Non-destructive testing of welded joints of thermoplastics semi-finished products - Visual examination.
• ISO 5893 - Rubber and plastics test equipment - Tensile, flexural and compression types (constant rate of traverse) - Specification.

Implementing EN 12814-6:2026 enhances product quality, supports international trade, and strengthens confidence in welded thermoplastic assemblies across industries.

SLOVENSKI STANDARD
oSIST prEN 12814-6:2025
01-julij-2025
Preskus zvarjenih spojev plastomernih polizdelkov - 6. del: Trgalni preskus pri
nizki temperaturi
Testing of welded joints of thermoplastics semi-finished products - Part 6: Low
temperature tensile test
Prüfen von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 6:
Zugversuch bei tiefen Temperaturen
Essais des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 6 :
Essai de traction à basse température
Ta slovenski standard je istoveten z: prEN 12814-6
ICS:
25.160.40 Varjeni spoji in vari Welded joints and welds
oSIST prEN 12814-6:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 12814-6:2025
oSIST prEN 12814-6:2025
DRAFT
EUROPEAN STANDARD
prEN 12814-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2025
ICS 25.160.40 Will supersede EN 12814-6:2000
English Version
Testing of welded joints of thermoplastics semi-finished
products - Part 6: Low temperature tensile test
Essais des assemblages soudés sur produits semi-finis Prüfen von Schweißverbindungen aus
en thermoplastiques - Partie 6 : Essai de traction à thermoplastischen Kunststoffen - Teil 6: Zugversuch
basse température bei tiefen Temperaturen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 249.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

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. prEN 12814-6:2025 E
worldwide for CEN national Members.

oSIST prEN 12814-6:2025
prEN 12814-6:2025 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle of the test . 6
5 Sampling procedures . 6
6 Dimensions of test specimens . 6
7 Cutting of test specimens . 8
8 Mechanical testing . 9
9 Test equipment . 9
10 Determination of the low temperature tensile welding factor . 9
11 Test report . 10
Annex A (informative) Test speeds and maximum test temperatures . 11

oSIST prEN 12814-6:2025
prEN 12814-6:2025 (E)
European foreword
This document (prEN 12814-6:2025) has been prepared by Technical Committee CEN/TC 249 “Plastics”,
the secretariat of which is held by SIS.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12814-6:2000.
prEN 12814-6:2025 includes the following significant technical changes with respect to
EN 12814-6:2000:
— It has been clarified that if one test specimen yields, all of the test specimens cut from both the welded
and unwelded test piece shall be tested at a temperature/speed that generates brittle fracture, not
just one specimen.
A list of all parts in a series can be found on the CEN website: https://www.cencenelec.eu/
oSIST prEN 12814-6:2025
prEN 12814-6:2025 (E)
1 Scope
This document specifies the dimensions, the method of sampling and the preparation of the test
specimens, also the conditions for performing the low temperature tensile test perpendicular to the weld
in order to determine the low temperature tensile welding factor.
A low temperature tensile test can be used in conjunction with other tests (e.g. bend, tensile creep, macro)
to assess the performance of welded assemblies, made from thermoplastics materials.
The low temperature tensile welding factor and the appearance of the fracture surface provide a guide
regarding the ductility of the joint and the quality of the work.
The test is applicable to co-axial or co-planar welded assemblies made from thermoplastics materials
filled or unfilled, but not reinforced, irrespective of the welding process used.
The test is not applicable for co-axial welded assemblies of an external diameter less than 20 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)
EN 13100-1, Non destructive testing of welded joints of thermoplastics semi-finished products - Part 1:
Visual examination
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 t
...