kSIST FprEN 18233:2026

• Abstract:

  This document covers the determination of the characteristic load resistance Fp and the characteristic plate stiffness kp of plate anchors.

• Status: Not Published
• Public Enquiry End Date: 16-Nov-2025
• ICS: 91.100.60 - Thermal and sound insulating materials
• Technical Committee: TOP - Thermal insulation
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 17-Aug-2026
• Due Date: 05-Oct-2026
• Ref Project: FprEN 18233 - Determination of characteristic load resistance and characteristic plate stiffness of plate anchors in the ETICS kit

kSIST FprEN 18233:2026 is a CEN draft European Standard for determining the characteristic load resistance F and characteristic plate stiffness k of plate anchors in the ETICS kit. It tells laboratories and manufacturers how to test these anchors, calculate the characteristic values, and record the results in a report.

What does kSIST FprEN 18233:2026 specify?

kSIST FprEN 18233:2026 specifies a test method for plate anchors used in ETICS kits, focusing on two properties: characteristic load resistance F and characteristic plate stiffness k. In practice, the document is used to compare products on a common basis and to document performance from a defined test setup.

The document is organized into clauses on scope, normative references, terms and definitions, principles, test equipment, test specimen, test conditions, procedure, calculation and expression of results, and the test report. Clause 4 explains the pulling principle, while clauses 6 to 9 cover how specimens are prepared, tested and evaluated.

What are the key requirements of kSIST FprEN 18233:2026?

• Clause 4 - test principle: kSIST FprEN 18233:2026 determines the properties by pulling an anchor plate through a metal ring under a defined tensile load. This matters because the test simulates the load path needed to measure how the plate behaves under pull-out conditions.

• Clause 5 - test equipment: The standard requires a solid support ring, a displacement transducer with 0.01 mm accuracy, clamping jaws, and a tensile testing machine with 0.01 kN accuracy. That means the laboratory needs equipment that can measure both force and movement precisely enough for small changes in anchor behaviour.

• Clause 6.1 - specimen set-up: The plate anchor rests with its plate on the support ring, and the expansion element is held by clamping jaws after removing the expansion zone. The measuring point changes according to whether the anchor is type 1 or type 2, so the lab must place the displacement measurement at the correct location for the anchor design.

• Clause 6.2 and 6.3 - specimens and conditioning: Five test specimens are required, and plate anchors made of polar plastic material are conditioned to equilibrium moisture content at 23 °C and 50 % RH until mass constancy. In practice, this keeps moisture effects from distorting the results and helps make different test series comparable.

• Clause 7 and 8 - test conditions and procedure: Testing is carried out at 23 °C and 50 % RH after conditioning, if needed, and the tensile load is increased until failure at a rate of 1 kN/min, with maximum load and displacement recorded. This gives a repeatable loading rate and a complete load-displacement record for later evaluation.

• Clause 9.1 - characteristic load resistance: kSIST FprEN 18233:2026 derives the characteristic load resistance from the 5 % quantile of the maximum loads at 90 % confidence, using the statistics from the test series. For the reader, this means the reported value is not a single peak load but a statistically derived characteristic value.

• Clause 9.2 - characteristic plate stiffness: The characteristic plate stiffness is the mean of the tangent stiffness values from the tests, with the tangent stiffness taken from the slope at 1 mm displacement. In practice, the user must extract a load-displacement slope, not just a maximum force, to describe how stiff the plate anchor is.

• Clause 10 - test report: The report must identify the product, list the test conditions and any amendments to the procedure, and give the individual and characteristic results. This is what a manufacturer, test lab or reviewer needs to document traceable performance data.

What terms does kSIST FprEN 18233:2026 define?

• Expansion element - the screw or nail that spreads the expansion zone of the anchor within the substrate for fixing.
• Expansion zone - the part of the anchor sleeve that is expanded by the expansion element.
• Characteristic load resistance - the statistical load value used to represent the anchor plate's resistance in reporting.
• Characteristic plate stiffness - the stiffness value used to represent the anchor plate's response under load.
• Tangent stiffness - the slope of the load-displacement curve at 1 mm displacement for a single test.
• Variation coefficient - the coefficient used to describe the spread of a test series and to support the statistical evaluation.

Who uses kSIST FprEN 18233:2026?

kSIST FprEN 18233:2026 is used by manufacturers of plate anchors and ETICS kits, testing laboratories, and quality teams that need repeatable performance data. It is also relevant to product evaluation, development testing, and technical documentation for thermal insulation products used in external thermal insulation composite systems with renders (ETICS).

Which standards are used with kSIST FprEN 18233:2026?

Standard	What it contributes
EN ISO 9229:2007	Vocabulary for thermal insulation terms used in the document.
ISO 12491:2019	Statistical methods for evaluating test series and variability.
EN 17237	ETICS specification that frames the product context for plate anchors.
EN ISO 1110:2019	Mentioned for accelerated conditioning of polar plastic test specimens.

What does the kSIST FprEN 18233:2026 document contain?

kSIST FprEN 18233:2026 contains a defined test setup, including a support ring, clamping arrangement and two measurement layouts for different plate anchor types. It also includes a load-displacement diagram and the calculation approach for characteristic load resistance and characteristic plate stiffness.

The document gives the conditioning step for polar plastic materials, the loading rate, and the way to record maximum load and displacement. Its reporting clause lists the product identification and the numerical results that must be reported for each test series.

SLOVENSKI STANDARD
oSIST prEN 18233:2025
01-november-2025
Ugotavljanje karakteristične nosilnosti in karakteristične togosti ploščatih sidrnih
plošč v kompletu ETICS
Determination of characteristic load resistance and characteristic plate stiffness of plate
anchors in the ETICS kit
Wärmedämmstoffe für das Bauwesen - Bestimmung der charakteristischen Tragfähigkeit
und der charakteristischen Steifigkeit von Tellerdübeln
Détermination de la résistance caractéristique à la charge et de la raideur caractéristique
des chevilles à rosace dans le kit ETICS
Ta slovenski standard je istoveten z: prEN 18233
ICS:
91.100.60 Materiali za toplotno in Thermal and sound insulating
zvočno izolacijo materials
oSIST prEN 18233:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 18233:2025
oSIST prEN 18233:2025
DRAFT
EUROPEAN STANDARD
prEN 18233
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2025
ICS 91.100.60
English Version
Determination of characteristic load resistance and
characteristic plate stiffness of plate anchors in the ETICS
kit
Détermination de la résistance caractéristique à la Wärmedämmstoffe für das Bauwesen - Bestimmung
charge et de la raideur caractéristique des chevilles à der charakteristischen Tragfähigkeit und der
rosace dans le kit ETICS charakteristischen Steifigkeit von Tellerdübeln
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 88.
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 18233:2025 E
worldwide for CEN national Members.

oSIST prEN 18233:2025
prEN 18233:2025 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
3.1 Terms and definition . 4
3.2 Symbols and units . 4
4 Principles . 5
5 Test equipment/apparatus . 5
6 Test specimen . 5
6.1 Preparing of the test specimen . 5
6.2 Numbers of the test specimen . 6
6.3 Conditioning of plate anchors . 6
7 Test conditions . 7
8 Procedure . 7
9 Calculation and expression of results . 7
9.1 Characteristic load resistance . 7
9.2 Characteristic plate stiffness . 7
10 Test report . 9

oSIST prEN 18233:2025
prEN 18233:2025 (E)
European foreword
This document (prEN 18233:2025) has been prepared by Technical Committee CEN/TC 88 “Thermal
insulating materials and products”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
oSIST prEN 18233:2025
prEN 18233:2025 (E)
1 Scope
This document covers the determination of the characteristic load resistance F and the characteristic
p
plate stiffness k of plate anchors.
p
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 9229:2007, Thermal insulation — Vocabulary (ISO 9229:2007)
ISO 12491:2019, Statistical methods for quality control of building materials and components
(ISO 12491:2019)
EN 17237, Thermal insulation products for buildings — External thermal insulation composite systems
with renders (ETICS) — Specification
3 Terms and definitions
3.1 Terms and definition
For the purposes of this document, the terms and definitions given in EN ISO 9229:2007 and EN 17237
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: av
...