kSIST FprEN 12814-6:2026

Testing of welded joints of thermoplastics semi-finished products - Part 6: Low temperature tensile test

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.

Prüfen von Schweißverbindungen aus thermoplastischen Kunststoffen - Teil 6: Zugversuch bei tiefen Temperaturen

Dieses Dokument legt die Maße, das Probenahmeverfahren und die Vorbereitung der Proben sowie die Bedin
gungen für die Durchführung der Zugprüfung bei tiefen Temperaturen senkrecht zur Schweißnaht fest, um den Zug-Schweißfaktor bei tiefen Temperaturen zu bestimmen.
Eine Zugprüfung bei tiefen Temperaturen kann in Verbindung mit weiteren Prüfungen (z.B. Biegeprüfung, Zeitstand-Zugprüfung, makroskopische Untersuchung) angewendet werden, um die Gebrauchstauglichkeit von geschweißten Baugruppen aus thermoplastischen Kunststoffen zu beurteilen.
Der Zug-Schweißfaktor bei tiefen Temperaturen und das Aussehen der Bruchfläche stellen ein Hilfsmittel für die Bewertung der Dehnbarkeit der Verbindung und die Qualität der Schweißung dar.
Dieses Dokument ist auf koaxiale oder in einer Ebene liegende Schweißverbindungen anwendbar, die aus gefüllten oder ungefüllten, nicht aber aus verstärkten thermoplastischen Kunststoffen bestehen, unabhängig vom angewendeten Schweißverfahren.
Dieses Dokument ist nicht anwendbar für koaxiale Baugruppen mit einem Außendurchmesser<20mm.

Essais des assemblages soudés sur produits semi-finis en thermoplastiques - Partie 6 : Essai de traction à basse température

Le présent document spécifie les dimensions, la méthode de prélèvement et de préparation des éprouvettes, ainsi que les conditions d'exécution de l'essai de traction à basse température effectué perpendiculairement à la soudure, afin de déterminer le facteur de soudage en traction à basse température.
Un essai de traction à basse température peut être effectué en combinaison avec d'autres essais (par exemple, essai de pliage, essai de fluage en traction, examen macrographique, etc.) afin d'évaluer les performances des assemblages soudés, réalisés avec des matériaux thermoplastiques.
Le facteur de soudage en traction à basse température et l'aspect de la surface de rupture renseignent sur la ductilité de la soudure et la qualité des travaux de soudage.
Le présent document est applicable aux assemblages soudés dans le même axe ou le même plan, réalisés avec des matériaux thermoplastiques chargés ou non chargés, mais non renforcés, quel que soit le
procédé de soudage utilisé.
Le présent document ne s'applique pas aux assemblages soudés dans le même axe ayant un diamètre
extérieur inférieur à 20 mm.

Preskus zvarjenih spojev plastomernih polizdelkov - 6. del: Trgalni preskus pri nizki temperaturi

General Information

• Status: Not Published
• Public Enquiry End Date: 30-Jul-2025
• ICS: 25.160.40 - Welded joints and welds
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 11-May-2026
• Due Date: 29-Jun-2026
• Completion Date: 11-May-2026
• Ref Project: FprEN 12814-6 - Testing of welded joints of thermoplastics semi-finished products - Part 6: Low temperature tensile test

Relations

• Revises: SIST 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

kSIST FprEN 12814-6:2026 is a European draft standard that specifies procedures for the low temperature tensile test of welded joints in thermoplastics semi-finished products. Developed by the Slovenski inštitut za standardizacijo (SIST) and the CEN/TC 249 Technical Committee, this standard outlines the dimensions, sampling methods, specimen preparation, and testing conditions necessary to determine the low temperature tensile welding factor. This procedure is crucial for evaluating the mechanical performance and quality assurance of welded assemblies constructed from thermoplastic materials, ensuring they meet international reliability and safety requirements.

Key Topics

• Test Methodology

  • Specifies dimensions and preparation of test specimens for weld assessment.
  • Describes the low temperature tensile test conducted perpendicular to the weld to promote brittle fracture.
  • Outlines sampling procedures to ensure consistent, representative testing.

• Performance Assessment

  • Introduces the low temperature tensile welding factor, a comparative metric for the strength of welded versus unwelded specimens.
  • Evaluates fracture surface appearance to gather insights into joint ductility and overall weld quality.

• Scope and Applicability

  • Applicable to both co-axial and co-planar welded assemblies of thermoplastics that are filled or unfilled, but not reinforced.
  • Covers welded assemblies produced by any welding process, provided external diameter (for co-axial assemblies) is not less than 20 mm.

• Reporting Requirements

  • Mandates comprehensive reporting of all test and specimen variables, including weld type, test temperatures, speeds, specimen dimensions, and visual observations.

Applications

The low temperature tensile test serves a vital role in the overall qualification and performance evaluation of welded thermoplastic assemblies:

• Quality Control in Manufacturing

  • Ensures weld integrity in piping, tanks, and other fabrications critical to chemical processing, water treatment, or infrastructure.
  • Provides a reliable metric for acceptance or rejection of welded joints based on mechanical strength and fracture characteristics.

• Material and Process Development

  • Assists in benchmarking various welding techniques and thermoplastic materials under sub-zero service conditions.
  • Offers comparative data to optimize welding parameters, such as temperature and speed, for improved ductility and fracture resistance.

• Safety and Regulatory Compliance

  • Enables engineers and manufacturers to comply with European and international quality standards for thermoplastic welds.
  • Supports documentation required for audits, certifications, and customer specifications.

• Research and Laboratory Testing

  • Useful in R&D settings for comparative studies on the effects of fillers, additives, or design changes on weld behavior at low temperatures.

Related Standards

• EN 13100-1: Non-destructive testing of welded joints in thermoplastics semi-finished products - Part 1: Visual examination.
• EN ISO 291: Plastics - Standard atmospheres for conditioning and testing.
• ISO 5893: Test equipment for rubber and plastics - Specifies equipment for tensile, flexural, and compression tests.
• EN 12814 Series: The broader standard series for testing of welded joints of thermoplastics semi-finished products, of which Part 6 focuses specifically on low temperature tensile testing.

---

By following kSIST FprEN 12814-6:2026, organizations can achieve standardized, reliable assessment of thermoplastic welded joints under low temperature conditions, leading to enhanced product quality, safety, and compliance with European directives and industry best practices.

Standards Content (Sample)

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
...