SIST EN 12608-1:2026

• Abstract:

  This document specifies the classifications, requirements and test methods for non-covered unplasticized poly(vinyl chloride) (PVC-U) profiles intended to be used for the fabrication of windows and doors.; NOTE For editorial reasons in this document the term “window” is used for window/door.

• Status: Published
• Public Enquiry End Date: 09-Jun-2025
• Publication Date: 20-Aug-2026
• ICS: 83.140.99 - Other rubber and plastics products
• ICS: 91.060.50 - Doors and windows
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 13-Aug-2026
• Due Date: 18-Oct-2026
• Completion Date: 21-Aug-2026
• Ref Project: EN 12608-1:2026 - Unplasticized poly(vinyl chloride) (PVC-U) profiles for the fabrication of windows and doors - Classification, requirements and test methods - Part 1: Non-covered PVC-U profiles

• Referred By: SIST EN 12608-4:2025 - Unplasticized poly(vinyl chloride) (PVC-U) profiles for the fabrication of windows and doors - Classification, requirements and test methods - Part 4: PVC-U profiles with thermo-laminated foils
• Effective Date: 12-Aug-2026
• Referred By: SIST EN 17410:2021 - Plastics - Controlled loop recycling of PVC-U profiles from windows and doors
• Effective Date: 12-Aug-2026
• Revises: SIST EN 12608-1:2016+A1:2020 - Unplasticized poly(vinyl chloride) (PVC-U) profiles for the fabrication of windows and doors - Classification, requirements and test methods - Part 1: Non-coated PVC-U profiles with light coloured surfaces
• Effective Date: 29-May-2024

SIST EN 12608-1:2026 is a CEN European Standard for non-covered unplasticized poly(vinyl chloride) (PVC-U) profiles used to fabricate windows and doors. It specifies how these profiles are classified, what requirements they have to meet, and which test methods are used to check them. In practice, it gives manufacturers, laboratories, specifiers and buyers a common basis for judging PVC-U profile quality and suitability.

What does SIST EN 12608-1:2026 specify?

SIST EN 12608-1:2026 specifies classifications, requirements and test methods for non-covered PVC-U profiles intended for windows and doors. For editorial reasons, the standard uses the term “window” to mean window/door.

The document is organized into Scope, Normative references, Terms and definitions, Classifications, Requirements, Test methods and Traceability, followed by two normative annexes.

Annex	What it covers
Annex A	Requirements for materials and the preparation of test specimens
Annex B	Calculation method for radiant exposure and exposure time for artificial weathering

What are the key requirements of SIST EN 12608-1:2026?

SIST EN 12608-1:2026 links profile acceptance to climate exposure, wall thickness, surface material, appearance, dimensions, heat behaviour, weldability and traceability. The main practical task is to match the profile class to the intended use, then verify it with the stated tests.

Classification and climate exposure

Clause 4.2 divides geographical Europe into two climatic zones: moderate climate (M) and severe climate (S). This matters because a profile designed for severe climate may also be used in moderate climate, but not the other way around.

Clause 4.3 classifies the surface material resistance to artificial weathering. The standard uses the classes UVM, RUVM, M and S, with test exposure based on EN 513 and the calculation method in Annex B. For the reader, this means the weathering claim is not just descriptive - it has to be tied to a defined exposure regime.

Clause 4.4 classifies main profiles by the wall thickness of external walls into classes A, B and C. Classes A and B set minimum thicknesses for sight surfaces, non-sight surfaces and seal grooves, while class C leaves those thicknesses without a requirement. In practice, this helps compare profile designs and check whether the declared wall thickness matches the intended class.

Materials and co-extrusion

Clause 5.1 and Annex A set the material rules. The standard allows virgin, recovered and reused material, and also allows fibre reinforcement if the identification requirements are met.

Visible surfaces have to use UV resistant material, while non-sight visible surfaces may use UV resistant material or reduced-UV resistant material (RUVM). The core of a profile may use any material allowed by Annex A, provided the visible surfaces are fully covered by a suitable co-extruded layer.

The minimum co-extruded layer thickness is 0.5 mm for sight surfaces and 0.2 mm for non-sight visible surfaces. For users, that means the surface layer is not just a design feature - it is part of the conformity check.

Appearance, dimensions and weight

Clause 5.2 requires visible surfaces to have a uniform colour and be free from pitting, impurities, cavities and similar defects. Edges have to be burr-free, except for the cut end of the profile bar. Colour differences are checked using CIE Lab* coordinates, so buyers can ask for a measurable colour control method rather than a subjective judgment.

Clause 5.3 sets dimensional control for the nominal profile shape, external dimensions and straightness. For main profiles, the deviation from straightness has to be within the stated limit when measured under the prescribed conditions. Clause 5.4 adds a linear weight requirement for main profiles: the measured linear weight has to reach at least 95 % of the nominal value. In practice, this supports fit, fabrication consistency and process control.

Heat behaviour, welding and optional checks

Clause 5.5 covers heat reversion for main and auxiliary profiles. Clause 5.6 requires profiles to show no defects after heating at 150 °C, and delamination of a co-extruded layer counts as failure. This matters for processing and service performance because it checks how the profile behaves under heat stress.

Clause 5.7 covers weldability by testing welded corners and T-joints in accordance with EN 514. The standard uses tensile bending and compression bending performance to judge whether welded joints are strong enough for fabrication and service.

Clause 5.8 treats ash content and resistance of main profiles to impact by falling mass as optional properties. If these are specified, the standard gives the corresponding test methods in Clause 6.

Traceability

Clause 7 requires minimum traceability information: the company responsible for extrusion, the relevant classes, production codes, any rPVC-U marking, any fibre reinforcement marking and a reference to EN 12608-1. Main profiles have to be identified at least every 2 m. For a buyer or quality manager, this makes batch tracing and recycling identification possible.

What terms does SIST EN 12608-1:2026 define?

SIST EN 12608-1:2026 uses the terms and definitions from EN 17508 and adds several profile-specific terms.

• Profile - a product produced by extrusion.
• Non-covered profile - a profile without any surface covering and without non-PVC-U co-extruded layers.
• Main profile - a profile that defines the structure of the window.
• Auxiliary profile - a profile used in window fabrication that is not a main profile.
• Sight surface - the surface exposed to view when the installed window is closed.
• Visible surface - any surface that can be exposed to UV radiation after installation, including sight and non-sight visible surfaces.
• Co-extruded profile - a profile produced with more than one extruder using different PVC-U materials in one process without mixing them.
• Reduced-UV resistant material (RUVM) - a surface material class permitted for non-sight visible surfaces where reduced UV resistance is acceptable.

Who uses SIST EN 12608-1:2026?

SIST EN 12608-1:2026 is used by PVC-U profile manufacturers, window and door fabricators, test laboratories, certification bodies, quality managers and purchasing teams. It is also relevant to specifiers who need to choose profile classes for a project.

In practice, these users apply it to classify profiles, define wall thickness, verify appearance and dimensions, check weathering and heat performance, and maintain traceability through production and supply.

What changed in SIST EN 12608-1:2026 from the previous edition?

SIST EN 12608-1:2026 supersedes EN 12608-1:2016+A1:2020. The foreword lists these significant technical changes:

• the restriction on profile colour and the exclusion of fibre reinforced material in Clause 1 were deleted
• the material definitions in Clause 3 were deleted and replaced by a reference to EN 17508
• material requirements were moved into a new Annex A
• RUVM is now permitted for non-sight visible surfaces
• classification of main profiles by resistance to impact by falling mass was deleted, and the test method was moved into Clause 6 as an optional property
• ash content was added as an additional optional test method in Clause 6
• editorial changes were made and normative references were updated

Which standards are used with SIST EN 12608-1:2026?

SIST EN 12608-1:2026 relies on the following referenced standards and companion parts.

Standard	What it contributes
EN 477	Impact resistance test by falling mass
EN 478	Appearance after heating at 150 °C
EN 479	Heat reversion test
EN 513	Artificial weathering test method
EN 514	Strength of welded corners and T-joints
EN 15346	Characterization of PVC recyclates
EN 17508	Terminology of PVC-based materials
EN 20105-A02	Grey scale for colour change assessment
EN ISO 105-A01:2010	General principles for colour fastness testing
EN ISO 178	Flexural properties
EN ISO 179-1	Charpy impact properties
EN ISO 306	Vicat softening temperature
EN ISO 3451-5	Ash content of PVC
EN ISO 8256	Tensile-impact strength
EN ISO 18314-1	Practical colour measurement
EN ISO 21306-2:2019	Preparation of test specimens and property determination for PVC-U materials
EN ISO/CIE 11664-1, -2, -4	Colorimetry definitions used for Lab* measurement
EN 12608 series	Companion parts for covered and coated PVC-U profile types

What does the SIST EN 12608-1:2026 document contain?

SIST EN 12608-1:2026 contains classification tables for climate zones, weathering resistance and wall thickness classes, plus requirements for materials, appearance, dimensions, linear weight, heat reversion, heating behaviour and weldability. It also contains traceability rules and marking examples.

The test section gives the methods for visual inspection, dimensional measurement, linear weight, co-extruded layer thickness, colour measurement, ash content and falling-mass impact. Annex A adds material property requirements and specimen preparation, while Annex B gives the calculation method for radiant exposure and exposure time, with supporting tables for moderate and severe climates. Figures illustrate profile geometry, surface designation, measurement positions and the rPVC pictogram used for traceability.

SLOVENSKI STANDARD
01-oktober-2026
Profili iz trdega polivinilklorida (PVC-U) za izdelavo oken in vrat - Razvrščanje,
zahteve in preskusne metode - 1. del: Neprevlečeni PVC-U profili
Unplasticized poly(vinyl chloride) (PVC-U) profiles for the fabrication of windows and
doors - Classification, requirements and test methods - Part 1: Non-covered PVC-U
profiles
Profile aus weichmacherfreiem Polyvinylchlorid (PVC-U) zur Herstellung von Fenstern
und Türen – Klassifizierung, Anforderungen und Prüfverfahren – Teil 1: Nicht
beschichtete PVC-U-Profile
Profilés de poly(chlorure de vinyle) non plastifié (PVC-U) pour la fabrication des fenêtres
et des portes - Classification, exigences et méthodes d'essai - Partie 1 : Profilés en PVC-
U non revêtus
Ta slovenski standard je istoveten z: EN 12608-1:2026
ICS:
83.140.99 Drugi izdelki iz gume in Other rubber and plastics
polimernih materialov products
91.060.50 Vrata in okna Doors and windows
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12608-1
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2026
EUROPÄISCHE NORM
ICS 83.140.99 Supersedes EN 12608-1:2016+A1:2020
English Version
Unplasticized poly(vinyl chloride) (PVC-U) profiles for the
fabrication of windows and doors - Classification,
requirements and test methods - Part 1: Non-covered PVC-
U profiles
Profilés de poly(chlorure de vinyle) non plastifié (PVC- Profile aus weichmacherfreiem Polyvinylchlorid (PVC-
U) pour la fabrication des fenêtres et des portes - U) zur Herstellung von Fenstern und Türen -
Classification, exigences et méthodes d'essai - Partie 1 : Klassifizierung, Anforderungen und Prüfverfahren -
Profilés en PVC-U non revêtus Teil 1: Nicht beschichtete PVC-U-Profile
This European Standard was approved by CEN on 5 July 2026.

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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12608-1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Classifications. 10
4.1 General . 10
4.2 Classification of climatic zones . 10
4.3 Classification of material to the resistance to artificial weathering . 11
4.4 Classification of main profiles according to the wall thickness of the external walls . 11
5 Requirements . 12
5.1 Material . 12
5.2 Appearance . 13
5.3 Dimensions and tolerances . 13
5.3.1 General . 13
5.3.2 Nominal shape. 13
5.3.3 Wall thickness of main profiles . 14
5.3.4 Tolerances on other dimensions . 14
5.3.5 Deviation from straightness of the main profiles . 14
5.4 Linear weight of the main profiles . 14
5.5 Heat reversion. 14
5.5.1 Main profiles . 14
5.5.2 Auxiliary profiles . 14
5.6 Behaviour after heating at 150 °C . 14
5.7 Weldability . 14
5.7.1 General . 14
5.7.2 Tensile bending test . 14
5.7.3 Compression bending test . 15
5.8 Optional properties . 15
6 Test methods . 15
6.1 Visual inspection . 15
6.2 Determination of dimensions . 15
6.2.1 Measuring devices . 15
6.2.2 Test specimen. 15
6.2.3 Conditioning . 15
6.2.4 Procedure . 15
6.3 Determination of the linear weight of the profile . 16
6.3.1 General . 16
6.3.2 Using a balance . 16
6.4 Determination of the thickness of a co-extruded layer . 17
6.5 Determination of colorimetric coordinates . 17
6.6 Determination of the ash content . 17
6.7 Determination of the resistance of main profiles to impact by falling mass . 17
7 Traceability . 18
Annex A (normative) Requirements for materials . 19
A.1 General . 19
A.2 Preparation of test specimens . 22
A.2.1 General . 22
A.2.2 Preparation of pressed plates . 22
A.2.3 Material properties . 22
Annex B (normative) Calculation method for the determination of the radiant exposure and
exposure time to be used for artificial weathering . 23
B.1 General . 23
B.2 Calculation. 23
Bibliography . 26

European foreword
This document (EN 12608-1:2026) 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 February 2026, and conflicting national standards shall
be withdrawn at the latest by February 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 12608-1:2016+A1:2020.
This document includes the following significant technical changes with respect to
EN 12608-1:2016+A1:2020:
— the restriction of profile colour and the exclusion of fibre reinforced material in Clause 1 have been
deleted;
— material definitions in Clause 3 have been deleted and replaced by reference to EN 17508;
— requirements for materials have been summarized in new Annex A;
— the use of RUVM for non-sight visible surfaces has been permitted;
— classification of main profiles according to the resistance to impact by falling mass has been deleted
and the test method has been moved to Clause 6 as optional property;
— the determination of the ash content has been added as an additional test method for an optional
property to Clause 6;
— editorial changes have been made and normative references have been updated.
EN 12608, Unplasticized poly(vinyl chloride) (PVC-U) profiles for the fabrication of windows and doors —
Classification, requirements and test methods consists of the following parts:
— Part 1: Non-covered PVC-U profiles
— Part 2: PVC-U profiles covered with laminated foils bonded with adhesives
— Part 3: PVC-U profiles covered with paint (in preparation)
— Part 4: PVC-U profiles with thermo-laminated foils
— Part 5: PVC-U profiles with co-extruded coloured top-layer (in preparation)
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 classifications, requirements and test methods for non-covered unplasticized
poly(vinyl chloride) (PVC-U) profiles intended to be used for the fabrication of windows and doors.
NOTE For editorial reasons in this document the term “window” is used for window/door.
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 477, Plastics — Poly(vinyl chloride) (PVC) based profiles — Determination of the resistance to impact of
profiles by falling mass
EN 478, Plastics — Poly(vinyl chloride) (PVC) based profiles — Determination of the appearance after
exposure at 150 °C
EN 479, Plastics — Poly(vinyl chloride) (PVC) based profiles — Determination of heat reversion
EN 513, Plastics — Poly(vinyl chloride) (PVC) based profiles — Determination of the resistance to artificial
weathering
EN 514, Plastics — Poly(vinyl chloride) (PVC) based profiles — Determination of the strength of welded
corners and T-joints
EN 15346, Plastics — Recycled plastics — Characterization of poly(vinyl chloride) (PVC) recyclates
EN 17508, Plastics — Unplasticized poly(vinyl chloride) (PVC-U) profiles for the fabrication of windows and
doors — Terminology of PVC based materials
EN 20105-A02, Textiles — Tests for colour fastness — Part A02: Grey scale for assessing change in colour
(ISO 105-A02)
EN ISO 105-A01:2010, Textiles — Tests for colour fastness — Part A01: General principles of testing
(ISO 105-A01:2010)
EN ISO 178, Plastics — Determination of flexural properties (ISO 178)
EN ISO 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact
test (ISO 179-1)
EN ISO 306, Plastics — Thermoplastic materials — Determination of Vicat softening temperature (VST)
(ISO 306)
EN ISO 3451-5, Plastics — Determination of ash — Part 5: Poly(vinyl chloride) (ISO 3451-5)
EN ISO 8256, Plastics — Determination of tensile-impact strength (ISO 8256)
EN ISO 18314-1, Analytical colorimetry — Part 1: Practical colour measurement (ISO 18314-1)
EN ISO 21306-2:2019, Plastics — Unplasticized poly(vinyl chloride) (PVC-U) moulding and extrusion
materials — Part 2: Preparation of test specimens and determination of properties (ISO 21306-2:2019)
EN ISO/CIE 11664-1, Colorimetry — Part 1: CIE standard colorimetric observers
EN ISO/CIE 11664-2, Colorimetry — Part 2: CIE standard illuminants
EN ISO/CIE 11664-4, Colorimetry — Part 4: CIE 1976 L*a*b* Colour space
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 17508 and the following 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
profile
product produced by extrusion
3.2
non-covered profile
profile without any surface covering and without any co-extruded layer(s) that are not made of PVC-U
EXAMPLE Profiles without laminated foils or painted surfaces.
Note 1 to entry: Profiles covered with a co-extruded layer other than PVC-U will be covered by a separate part of
this standard series (in preparation).
3.3
main profile
profile, which defines the structure of the window
Note 1 to entry: See Figure 1.
3.4
auxiliary profile
profile intended to be used for the fabrication of a window which is not a main profile
Note 1 to entry: Main and auxiliary profiles can be different according to the window construction techniques in
the individual countries.
Note 2 to entry: See Figure 1.
Key
1 transom
2 sash
3 frame
4 mullion
Figure 1 — Illustration of main profiles
3.5
external wall (of a main profile)
wall of a main profile corresponding to its sight and non-sight surfaces
3.6
sight surface
surface of a profile exposed to view when the installed window is closed
Note 1 to entry: See Figure 2.
3.7
visible surface
any surface or parts of surface of a profile which can be exposed to UV radiation after installation of the
window, open or closed (sight surface and non-sight visible surface)
Note 1 to entry: See Figure 2.
Key
1 + 2 sight surfaces
3 non-sight visible surface (rebate that is visible when the window is open)
4 non-visible surface
5 frame profile
6 sash/casement profile
NOTE Types of profiles are given as examples only.
Figure 2 — Designation of profile surfaces by the example of frame profile and sash profile
3.8
co-extruded profile
profile produced by using more than one extruder with different PVC-U materials according to EN 17508
in one production process without mixing them
3.9
nominal profile shape
shape and dimensions of a profile, as specified by the manufacturer
3.10
deviation from straightness
deviation of the longitudinal axis of a profile from the straight line
3.11
depth (of a profile)
d
dimension, measured at right angles to the glazing plane, between the front and the back sight surfaces
of a profile
Note 1 to entry: See “d” in Figure 3.
3.12
overall width (of a profile)
w
largest dimension, measured in the direction of the glazing plane, perpendicular to the longitudinal axis
of a profile
Note 1 to entry: See “w” in Figure 3.

Key
d depth of a profile
w overall width of a profile
Figure 3 — Cross-section of a typical profile
4 Classifications
4.1 General
The selection of appropriate classes necessary to fulfil national requirements may be given in a national
foreword of EN 12608-1.
4.2 Classification of climatic zones
For the purposes of this document, geographical Europe is divided in two zones, climate M (moderate)
and climate S (severe) as defined in Table 1. These climatic zones do not cover climates outside of
geographical Europe.
Table 1 — Classification of climatic zones in Europe
Class M (moderate climate) S (severe climate)
2 2
a
< 5 GJ/m ≥ 5 GJ/m
Annual total solar radiant exposure on horizontal
surface
and or
a
Average temperature of the warmest month per year < 22 °C ≥ 22 °C
NOTE For the purpose of this document, “moderate climate” refers in general to warm and humid weathering
conditions and “severe climate” to hot and dry weathering conditions. The relevant moderate and severe test
methods for artificial weathering can be found in EN 513.
a
Values measured according to the specifications of the World Meteorological Organization (WMO).

Profiles which are designed to be used in a severe climate (S) may also be used in a moderate climate (M).
In those countries where the two climatic zones exist, care should be taken that profiles designed for a
moderate climate (M) are not used in the severe climate (S).
4.3 Classification of material to the resistance to artificial weathering
For the resistance to artificial weathering, the material used for the surface of the profile shall be
classified according to Table 2. For calculation of the exposure time see Annex B.
Table 2 — Classification of material according to the resistance to artificial weathering
Class RUVM M S
Method 1 Method 1 Method 2
Test method according to EN 513
(climate M) (climate M) (climate S)
Radiant exposure in wavelength
2 2 2
1 GJ/m 8 GJ/m 12 GJ/m
range (300 to 800) nm
approximate exposure time (for
500 h 4 000 h 6 000 h
information)
4.4 Classification of main profiles according to the wall thickness of the external walls
For the wall thickness of the external walls, the main profiles shall be classified according to Figure 4 and
Table 3.
Figure 4 shows the areas of typical main profiles where the wall thicknesses of external walls shall satisfy
the requirements given in Table 3.

NOTE The types of walls are explained in Table 4.
Figure 4 — Areas of two typical main profiles with required external wall thicknesses
Table 3 — Classification of main profiles according to external wall thickness
Type of external wall Class A Class B Class C
(see Figure 4)
sight surface ≥ 2,8 mm ≥ 2,5 mm No requirement

non-sight surface ≥ 2,5 mm ≥ 2,0 mm No requirement

seal groove ≥ 2,0 mm ≥ 2,0 mm No requirement

not to consider No requirement No requirement No requirement

NOTE The classification of main profiles according to the wall thickness is intended to represent the
wide variations in profile and window design for the various systems which are in use in Europe. It is not
intended to imply differences in profile quality or in the performance of windows provided that the relevant
performance requirements for both profiles and windows are met.

In order to be classified for either class A or B both minimum requirements for the wall thickness shall
be fulfilled.
5 Requirements
5.1 Material
All requirements for materials are given in Annex A.
Recovered material rPVC-U may be re-stabilized and/or enhanced with additives (e.g. modifiers,
pigments, lubricants) before use.
The use of permitted materials on surfaces of profiles is given in Table 4.
Table 4 — Use of materials on surfaces of profiles
Visible surface Non-visible surface
Sight surface Non-sight visible surface
Any UV resistant material Any UV resistant material (class Any material according to
(class M or S) M or S) or reduced-UV resistant Annex A
material (class RUVM)
In the core of the profile any material according to Annex A may be used where any visible surfaces are
completely covered by co-extrusion with a material suitable for these surfaces according to Table 4.
The minimum value of thickness of the co-extruded surface layer shall be
— for sight surfaces 0,5 mm;
— for non-sight visible surfaces 0,2 mm.
There is no requirement concerning the thickness of the co-extruded surface layer
— for the inner surface of grooves with an entry width ≤ 5 mm;
— for grooves pro
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