EN 12608‑1 | PVC‑U Window‑Door Profile Standard, Test Methods & Testing Machine Solution

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EN 12608‑1 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

EN 12608-1 defines how profiles are classified, which properties must be met, and exactly how each property is tested. For profile extruders, window system houses, certification bodies and independent laboratories, this standard – not marketing claims – decides whether a profile can be sold as a durable, weathering-resistant window profile in Europe.

The standard applies to non-coated PVC-U profiles whose visible surfaces are light coloured, defined by colorimetric coordinates:

L* ≥ 82 (chromaticity coordinate Y ≥ 60)

−5 ≤ b* ≤ 15

Darker or colour-coated profiles fall under the future Parts 2–4 (laminated, co-extruded, lacquered). Profiles made from PVC-U compounds with reinforcements (e.g. glass fibres) are explicitly excluded. Throughout the document, “window” is used to mean window/door.

Classifications

1. Climatic‑zone classification: Moderate climate (M) and Severe climate (S), for weathering‑resistance design of window profiles across geographical Europe.

2. Falling‑mass impact classification: Characterises low‑temperature impact toughness of main profiles at −10 °C.

3. External‑wall thickness classification: Class A / Class B / Class C, defining minimum wall‑thickness for sight surfaces, non‑sight surfaces and seal‑groove areas of extruded profiles.

4. Material classification: UV‑resistant virgin material, non‑UV‑resistant virgin material, own‑reprocessed material, external‑reprocessed material and post‑consumer recycled material, specifying allowed application scenarios for each raw‑material category.

Material scope

Covers PE (polyethylene) and PVC‑U (unplasticized polyvinyl chloride, including modified PVC‑U for lining) pipes and fittings for gravity non‑pressure sewer renovation. It defines two product stages:

M‑stage: Manufactured‑as‑produced pipe condition (factory output before site installation).
I‑stage: Installed‑in‑situ lining system after on‑site re‑forming / heat‑reversion.

Important note: ISO 11296‑3:2018 applies to NON‑PRESSURE gravity sewer networks only. For pressurized sewer close‑fit lining, you should refer to ISO 11297‑3; for drinking‑water close‑fit liners refer to ISO 11298‑3iteh.eu. This standard does NOT contain burning / fire resistance test clauses; fire performance shall follow separate building‑fire related ISO standards.

Industry application fields

PVC-U profile extrusion – the primary users: compound formulation, die design, wall-thickness class strategy, in-process quality control.

Window and door system houses and fabricators – welding parameters (EN 514 corner strength), profile purchasing specifications, warranty claims.

Building construction and façade engineering – specification of durable, low-maintenance window systems; climatic zone selection (M/S) for the project location.

Third-party testing, inspection and certification (ISO/IEC 17025 laboratories) – initial type testing (ITT) and factory production control (FPC) support for CE marking under Regulation (EU) 305/2011 and EN 14351-1.

Raw material and additive suppliers – PVC resin, impact modifiers, TiO₂, heat stabilisers; proving that a compound meets Annex A and weathering limits.

Recycling and circular-economy operations – qualifying ORM/ERM/RM streams for use in defined profile surfaces (Table 4), a fast-growing area since the 2016 revision formalised reprocessed/recycled categories.

Quality marks and trade associations – e.g. RAL-GZ 716 (Germany), national PVC window associations, and equivalent schemes in Australia/New Zealand that mirror EN 12608-1 with EN ISO 179-1 Charpy thresholds.

Test equipment manufacturers (UnitedTest) – supplying the falling-weight impact testers, Charpy machines, Vicat/HDT testers, UTMs, ovens, weathering chambers and notching devices that make the clauses measurable.

EN 12608-1 Test equipment mapping (UnitedTest)

EN 12608-1 requirement	UnitedTest equipment	Key specs to look for
Impact by falling mass (EN 477)	Falling weight / drop-weight impact tester + −10 °C conditioning chamber	Guided rails, 1 000 g striker with hemispherical tip, 1 000 / 1 500 mm drop, anti-rebound, rigid specimen clamping
Charpy impact (EN ISO 179-1)	Charpy impact tester (pendulum) + notching machine	2 J pendulum (1 J / 4 J / 5 J options), 40 mm span, digital energy readout, double-notch cutter with 3 mm residual-width setting
Vicat softening temperature (EN ISO 306, B50)	Vicat / HDT softening point tester	50 ± 5 °C/h ramp, oil bath, ≥ 75 °C capability, 3–6 stations
flexural modulus (EN ISO 178)	Universal testing machine (UTM) with 3-point bending kit	Class 0.5/1 force accuracy, deflection or extensometer measurement, 23 ± 2 °C conditioned testing
tensile impact strength (EN ISO 8256, type 5)	Tensile impact tester	Pendulum with tensile-impact striker/yoke, type 5 specimen grips
Heat reversion (EN 479)	Forced-air circulating oven at 100 ± 3 °C + 0.1 mm length gauge	Temperature uniformity, ≥ 250 mm specimen capacity, scribing jig for 200 mm marks
Behaviour after heating at 150 °C (EN 478)	Ventilated oven 150 ± 3 °C	Recovery to set-point within 15 min after loading, non-stick supports (talc / PTFE)
Artificial weathering (EN 513)	Xenon-arc weathering chamber	300–800 nm radiant exposure control, black-standard temperature, spray cycles, 4 000 h / 6 000 h (8 / 12 GJ/m²) programmes
Colour fastness and colourimetry	Spectrophotometer / colourimeter	D65, d/8° geometry, SCI, Lab* and ΔE* calculation per ISO 18314-1
Welded corner and T-joint strength (EN 514)	UTM with tensile-bending and compression-bending fixtures	Constant crosshead speed, stress calculation in N/mm², fixtures for corner and T-joint specimens

Main Test Methods and Test Introduction of EN 12608‑1

1, Heat‑reversion test
Test standard	EN 479
Test Stipulation	1. Main profiles: heat‑reversion rate for two major sight surfaces ≤ 2.0 %; difference between two surfaces ≤ 0.4 %. 2. Auxiliary profiles: heat‑reversion ≤ 3.0 %; external‑use glazing beads limit ≤ 2 %.
Test Specimen info	profile segments (main profile / auxiliary profile).
2, Falling‑mass impact test
Test standard	EN 477
Test Equipment	falling‑mass impact tester for PVC‑U hollow profiles, controlled low‑temperature conditioning chamber, profile mounting fixtures.
Test Stipulation	Maximum one test specimen shall show rupture on tested external sight‑surface; delamination is failure condition.
Test Specimen info	Cut from main profiles (Class 0 profiles are exempted). Pre‑condition at −10 °C.
Test Procedure	Drop defined mass from specified height corresponding to profile impact class, impact on external sight surfaces. Co‑extrusion‑layer delamination counts as failure.
3, Charpy notched‑impact Test
Test standard	ISO 179
Test Equipment	Charpy pendulum impact tester.
Test Stipulation	Average Charpy impact strength shall meet threshold values corresponding to profile wall‑thickness class; also applies after artificial weathering with maximum‑allowed strength reduction defined in standard table.
Test Specimen info	taken from profile sight surface, longitudinal direction matches profile extrusion direction; dimensions: length 50 ± 1 mm, width 6 ± 0.2 mm; residual notch width 3 ± 0.1 mm; support span 40 +0.5/0 mm.
4, Artificial weathering test
Test standard	EN 513
Test Equipment	Hot‑air circulating oven stable at (120 ± 2) °C, caliper dimension measuring tool.
Post‑weathering evaluations	1. Charpy impact strength (shall not drop below class‑specific threshold). 2. Colour‑fastness (ΔE* ≤ 5, \|Δb*\| ≤ 3)
Test Specimen info	cut from profile sight surfaces.
5, Welded‑corner & T‑joint strength test
Test Equipment	Universal testing machine with dedicated corner‑bending fixtures; force‑recording and failure‑stress‑calculation function.
Test standard	EN 514
Test Specimen info	Real hot‑welded 90° corners / T‑joints. Weld seam shall not be grooved or knifed‑finished; only outer 90° edges may be cleaned for fixture seating. Two sets of specimens for tensile‑bending and compression‑bending.
Test Procedure	Load until joint fracture, record peak force and compute failure stress.
6, Behaviour after heating at 150 °C
Test Stipulation	No defects; co‑extrusion‑layer delamination = test failure.Thermal exposure at 150 °C following EN 478.
Test Standard	EN 478
Test Specimen info	profile sample.
Other Material‑characteristic test	Vicat softening temperature (VST);  ISO 306 Method B, heating‑rate 50 ± 5 °C/h; Average ≥ 75 °C; every single value ≥ 73 °C
	Flexural modulus of elasticity;  ISO 178 (23 ± 2 °C) ; Average ≥ 2 200 N/mm²; individual ≥ 2 000 N/mm²
	Tensile‑impact strength: ISO 8256, Type 5 specimen; Average ≥ 600 kJ/m²; individual ≥ 450 kJ/m²

Keywords: EN 12608‑1, EN 12608‑1:2016+A1:2020, PVC‑U profile test standard, unplasticized PVC window door profile testing, falling mass impact test for PVC‑U profile, Charpy impact test for UPVC profile, welded corner strength test EN 514, heat reversion test PVC profile, artificial weathering test for PVC‑U window profile, Vicat softening temperature test for PVC‑U, UPVC profile dimensional tolerance test, UnitedTest PVC‑U profile testing equipment, non‑coated light‑coloured PVC‑U profile laboratory testing, European standard for uPVC extrusion profile quality control

WDW Series Computer Control Electronic Universal Testing Machine made by UNITEDTEST range from 100N to 600KN load capacity with various models like single columns, table type, door frame type etc., is used to perform tension, compression, flexure/bending, shearing, peeling etc., test for metal and nonmetal specimens.

Charpy & Izod Integrated Impact Tester combine the Charpy and IZOD two impact method in one machine, include the full IZOD and Charpy test energy, simply change pendulum and vice, in one machine meet user multiple test requirement, enhance the working efficiency.

Pipe Falling Hammer Impact Testing Machine for assessing the impact resistance and toughness of plastic and metal pipes, offering controlled hammer energy, accurate impact measurement, and reliable quality evaluation for industrial and laboratory testing.

Heat Distortion Temperature Tester for accurate measurement of plastic materials’ heat deflection under load, ensuring reliable thermal performance evaluation, quality control, and compliance with international standards.

Pipe Size Change Measuring Tester/ Longitudinal Reversion Tester suitable to measure various kinds of plastic pipe or plastic materials size change after heating, or used to heat the test sample. It can be used as a heating oven as well.

pipe ring stiffness test machine is used to determine the ring stiffness of circular cross-section thermoplastic pipes, according customer’s request, it can also execute compression, ring stiffness, ring softness and creep ratio test.

Elevate your pipeline testing with our advanced hydrostatic pressure testing machine, designed per ISO 1167, ASTM D1598, and ASTM D1599 standards. Perfect for evaluating the durability of plastic and compound pipelines like PP-R, PVC, and PE, it applies precise constant or rapid hydraulic pressure, ensuring reliable performance.

Extrusion Plastometer is for melt mass-flow rate (MFR) and the melt volume-flow rate (MVR),to measure the melt mass flow rate of thermoplastic plastics under specific temperatures and pressures, reflecting the flow performance of materials through standardized testing.

Oxidative Induction Time testing machine is kind of differential scanning calorimeter,, check the relation of temperature with the rate differential input in test sample and reference articles. used to do Oxidative Induction Time test, heat stability, glass transition temperature, melting point.

Methylene chloride tester/Dichloromethane soak testing machine is used to determine the resistance of unplasticised polyvinyl chloride (PVC-U) pipes to dichloromethane (methylene chloride) at a specified temperature (DCMT).

UnitedTest Pipe Apparent Hoop Tensile Testing Machine complies with ASTM D2290, specialized in testing apparent hoop tensile strength of plastic and reinforced plastic pipes. It uses a self-aligning split disk fixture to apply tensile stress to pipe ring samples along their contour.

Hoop tensile strength of plastic pipes is designed based on the ASTM D2290, to determine the breaking strength for the pipe hoop tensile test. ASTM D2290 is a test method used to study the apparent tensile strength of plastic pipes using a specialized test fixture to pull apart a ring of pipe.

Q1: What is EN 12608-1 used for?

It specifies the classifications, requirements and test methods for non-coated, light-coloured PVC-U profiles used to make windows and doors – the basis for type testing, factory production control, CE-marking support and quality marks in Europe.

Q2: What is the Charpy impact requirement for PVC-U window profiles?

Mean values of at least 55 kJ/m² (class A, wall ≥ 2.8 mm), 60 kJ/m² (class B, ≥ 2.5 mm) and 65 kJ/m² (class C), tested to EN ISO 179-1 with the adapted double-notched 1fA specimen. After artificial weathering the reduction may not exceed 40 % / 30 % / 20 % respectively.

Q3: At what temperature is the falling-mass impact test performed?

−10 °C, with specimens conditioned for at least one hour; the mass is 1 000 g and the drop height 1 000 mm (class I) or 1 500 mm (class II).

Q4: How long is the artificial weathering test?

The standard targets an exposure equivalent to five years outdoors: about 8 GJ/m² in the 300–800 nm band (≈ 4 000 h) for moderate climate M and about 12 GJ/m² (≈ 6 000 h) for severe climate S, per EN 513 (Annex B gives the calculation). For quality control the period may be shortened to a two-year equivalent.

Q5: Can recycled PVC be used in EN 12608-1 profiles?

Yes, within Table 4: visible surfaces require UV-resistant material, non-sight visible surfaces may use reduced-UV or other Annex A materials, and use of post-consumer recycled material (RM1) must be declared in the profile marking.

Q6: References of the related standards?

EN 12608-1:2016+A1:2020 – PVC-U profiles for windows and doors, Part 1 (CEN/TC 249).

EN 477 – PVC-based profiles: resistance to impact by falling mass.

EN 478 – PVC-based profiles: appearance after exposure at 150 °C.

EN 479 – PVC-based profiles: determination of heat reversion.

EN 513 – PVC-based profiles: resistance to artificial weathering.

EN 514 – PVC-based profiles: strength of welded corners and T-joints.

EN ISO 179-1, EN ISO 178, EN ISO 306, EN ISO 8256, EN ISO 11664 series, ISO 18314-1, EN 20105-A02, EN ISO 21306-2.

EN 14351-1 – Windows and doors – product standard, performance characteristics (CE marking under Regulation (EU) No 305/2011).

Q7: Why EN 12608‑1 Is Critical for PVC‑U Materials?

PVC‑U window‑door profiles work under complex outdoor conditions: low‑temperature impact, solar UV ageing, thermal‑cycle deformation, mechanical load from welded joints, and dimensional stability after extrusion.

Unifies evaluation criteria: Before this harmonised standard, different European countries used divergent test thresholds for UPVC profiles, causing barriers to cross‑border trade.

Guarantees in‑service durability: Defines material limits for virgin, reprocessed and recycled PVC‑U; restricts improper use of non‑UV‑stable material on visible surfaces to avoid yellowing, brittleness or early failure in real‑world building service.

Controls extrusion‑process quality: Wall‑thickness, straightness, linear weight and heat‑reversion requirements verify whether extrusion‑tooling and process parameters are stable.

Validates welded‑joint reliability: Welded corners are the most frequent failure point of uPVC windows; the standard defines tensile‑bending and compression‑bending test thresholds to prevent window‑frame collapse under wind and thermal stress.

Supports circular economy: Gives clear rules for safe utilisation of own‑reprocessed and external‑reprocessed PVC‑U material in profile cores, while still protecting visible surface performance via co‑extrusion layer minimum‑thickness rules.

From the lab‑testing perspective, every requirement in EN 12608‑1 must be verified by standardised test‑equipment. UnitedTest develops complete testing‑instrument portfolios for manufacturers and labs to run all mandatory EN 12608‑1 tests for PVC‑U window‑door profiles.

We offer customization to meet your specific needs. Our expert team will collaborate with you to develop the perfect product for you