EN 1555-1:2025

SLOVENSKI STANDARD
01-december-2025
Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Polietilen
(PE) - 1. del: Splošno
Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 1:
General
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 1:
Allgemeines
Systèmes de canalisations en plastique pour la distribution de combustibles gazeux -
Polyéthylène (PE) - Partie 1 : Généralités
Ta slovenski standard je istoveten z: EN 1555-1:2025
ICS:
83.140.30 Polimerne cevi in fitingi za Plastics pipes and fittings for
snovi, ki niso tekočine non fluid use
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 1555-1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2025
EUROPÄISCHE NORM
ICS 23.040.01 Supersedes EN 1555-1:2021
English Version
Plastics piping systems for the supply of gaseous fuels -
Polyethylene (PE) - Part 1: General
Systèmes de canalisations en plastique pour la Kunststoff-Rohrleitungssysteme für die Gasversorgung
distribution de combustibles gazeux - Polyéthylène - Polyethylen (PE) - Teil 1: Allgemeines
(PE) - Partie 1 : Généralités
This European Standard was approved by CEN on 11 August 2025.

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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1555-1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 8
3.1 Terms related to material characteristics . 8
3.2 Terms related to service conditions . 9
3.3 Terms related to joints . 10
4 Symbols and abbreviated terms . 10
4.1 Symbols. 10
4.2 Abbreviated terms . 11
5 Material . 12
5.1 Material of the components . 12
5.2 Compound . 12
5.2.1 Additives and pigments . 12
5.2.2 Colour . 12
5.2.3 Characteristics . 12
5.3 Fusion compatibility . 18
5.4 Classification and designation . 18
5.5 Design coefficient and design stress . 19
Annex A (informative) Additional information related to the installation of PE 100-RC systems . 20
A.1 Pipe material . 20
A.2 Installation conditions . 21
Annex B (informative) Additional information related to the suitability of PE pipe systems for
100 % hydrogen and its admixtures with natural gas . 23
B.1 General . 23
B.2 Chemical resistance . 23
B.3 Permeation . 24
Bibliography. 28

European foreword
This document (EN 1555-1:2025) has been prepared by Technical Committee CEN/TC 155 “Plastics piping and
ducting systems”, the secretariat of which is held by NEN.
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 April 2026, and conflicting national standards shall be withdrawn at
the latest by April 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 1555-1:2021.
The main changes are as follows:
— terms and definitions have been distributed over EN 1555-1, EN 1555-2 and EN 1555-3;
— a conversion and normalisation step has been included to the requirement for the CRB;
— EN ISO 1183-3 has been introduced as alternative test method for the compound density;
— recommended stress ranges for the CRB and stress levels for the AFNCT have been added;
— the strip-bend test (ISO 21751) and the crush test (ISO 13955) have been added as alternative to
ISO 13954;
— a requirement for the electrofusion compatibility has been added;
— information related to the suitability of PE pipe systems for 100 % hydrogen and its admixtures with nat-
ural gas has been added.
System Standards are based on the results of the work being undertaken in ISO/TC 138 “Plastics pipes, fittings
and valves for the transport of fluids”, which is a Technical Committee of the International Organization for
Standardization (ISO).
They are supported by separate standards on test methods to which references are made throughout the
System Standard.
The System Standards are consistent with general standards on functional requirements and on recommended
practice for installation.
EN 1555 consists of the following parts:
— EN 1555-1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1: General
(this document);
— EN 1555-2, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes;
— EN 1555-3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings;
— EN 1555-4, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves;
— EN 1555-5, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5: Fitness for
purpose of the system;
In addition, the following document provides guidance on the assessment of conformity:
— CEN/TS 1555-7, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) —Part 7:
Guidance for assessment of conformity.
NOTE EN 12007-2 prepared by CEN/TC 234 “Gas infrastructure” deals with the recommended practice for
installation of plastics pipes system in accordance with EN 1555 (all parts).
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.

Introduction
The EN 1555 series specifies the requirements for a piping system and its components made from polyethylene
(PE) compounds, which is intended to be used for the supply of gaseous fuels.
This document covers materials and the general aspects of the plastics piping system.
Requirements and test methods for components of the piping system are specified in EN 1555-2, EN 1555-3
and EN 1555-4.
Characteristics for fitness for purpose of the system are covered in EN 1555-5. CEN/TS 1555-7 gives guidance
for assessment of conformity.
Recommended practice for design, handling and installation is given in EN 12007-2.

1 Scope
This document specifies materials and the general aspects of polyethylene (PE) piping systems in the field of
the supply of gaseous fuels.
NOTE For the purpose of this document the term gaseous fuels include for example natural gas, methane, butane,
propane, hydrogen, manufactured gas, biogas, and mixtures of these gases.
It also specifies the test parameters for the test methods referred to in this document.
In conjunction with EN 1555-2, EN 1555-3, EN 1555-4 and EN 1555-5, this document is applicable to PE pipes,
fittings and valves, their joints and, joints with components of PE and other materials intended to be used under
the following conditions:
a) a maximum operating pressure, MOP, up to and including 10 bar at a design reference temperature of
20 °C;
b) an operating temperature between −20 °C and 40 °C.
For operating temperatures between 20 °C and 40 °C, derating coefficients are specified in EN 1555-5.
The EN 1555 series covers a range of MOPs and gives requirements concerning colours.
It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects,
taking into account their particular requirements and any relevant national guidance or regulations and
installation practices or codes.
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 1555-2:2025, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes
EN 1555-3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
EN 1555-4, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves
EN 12099, Plastics piping systems — Polyethylene piping materials and components — Determination of volatile
content
EN ISO 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of
thermoplastics — Part 1: Standard method (ISO 1133-1)
EN ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the
resistance to internal pressure — Part 1: General method (ISO 1167-1)
EN ISO 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the
resistance to internal pressure — Part 2: Preparation of pipe test pieces (ISO 1167-2)
EN ISO 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion
method, liquid pycnometer method and titration method (ISO 1183-1)

1 5 2
1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
EN ISO 1183-2, Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient
column method (ISO 1183-2)
EN ISO 6259-1, Thermoplastics pipes — Determination of tensile properties — Part 1: General test method
(ISO 6259-1)
EN ISO 6259-3, Thermoplastics pipes — Determination of tensile properties — Part 3: Polyolefin pipes
(ISO 6259-3)
EN ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation (ISO 9080)
EN ISO 11357-6, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation
induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) (ISO 11357-6)
EN ISO 12162, Thermoplastics materials for pipes and fittings for pressure applications — Classification,
designation and design coefficient (ISO 12162)
EN ISO 13477, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack
propagation (RCP) — Small-scale steady-state test (S4 test) (ISO 13477)
EN ISO 13478, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack
propagation (RCP) — Full-scale test (FST) (ISO 13478)
EN ISO 13479:2022, Polyolefin pipes for the conveyance of fluids — Determination of resistance to crack
propagation — Test method for slow crack growth on notched pipes (ISO 13479:2022)
EN ISO 15512, Plastics — Determination of water content (ISO 15512)
EN ISO 16871, Plastics piping and ducting systems — Plastics pipes and fittings — Method for exposure to direct
(natural) weathering (ISO 16871)
ISO 6964, Polyolefin pipes and fittings — Determination of carbon black content by calcination and pyrolysis —
Test method
ISO 11413:2019, Plastics pipes and fittings — Preparation of test piece assemblies between a polyethylene (PE)
pipe and an electrofusion fitting
ISO 11414:2009, Plastics pipes and fittings — Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test piece
assemblies by butt fusion
ISO 13953, Polyethylene (PE) pipes and fittings — Determination of the tensile strength and failure mode of test
pieces from a butt-fused joint
ISO 13954, Plastics pipes and fittings — Peel decohesion test for polyethylene (PE) electrofusion assemblies of
nominal outside diameter greater than or equal to 90 mm
ISO 16770, Plastics — Determination of environmental stress cracking (ESC) of polyethylene — Full-notch creep
test (FNCT)
ISO 18488, Polyethylene (PE) materials for piping systems — Determination of Strain Hardening Modulus in
relation to slow crack growth — Test method
ISO 18489:2015, Polyethylene (PE) materials for piping systems — Determination of resistance to slow crack
growth under cyclic loading — Cracked Round Bar test method
ISO 18553, Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes,
fittings and compounds
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1555-2, EN 1555-3 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 Terms related to material characteristics
3.1.1
lower confidence limit of the predicted hydrostatic strength
σ
LPL
quantity that represents the 97,5 % lower confidence limit of the predicted hydrostatic strength at temperature
θ and time t
Note 1 to entry: It is expressed in megapascals (MPa).
3.1.2
minimum required strength
MRS
value of the lower confidence limit of the predicted hydrostatic strength (3.1.1) at 20 °C and 50 years, rounded
down to the next smaller value of the R10 series or the R20 series
Note 1 to entry: Only compounds with an MRS of 8 MPa or 10 MPa are specified in this document.
Note 2 to entry: The R10 series and the R20 series conform to ISO 3 [11].
Note 3 to entry: It is expressed in megapascals (MPa).
[SOURCE: EN ISO 12162:2009, 3.3, modified — Note 1 to entry has been removed and replaced with new Notes 1 to 3 to
entry.]
3.1.3
design coefficient
C
coefficient with a value greater than 1, which takes into consideration service conditions as well as properties
of the components of a piping system other than those represented in the lower confidence limit of the predicted
hydrostatic strength (3.1.1)
3.1.4
design stress
σ
s
allowable stress for a given application at 20 °C, that is derived from the minimum required strength, MRS
(3.1.2), by dividing it by the design coefficient, C (3.1.3)
Note 1 to entry: This is demonstrated in the following formula:
MRS
σ =
S
C
Note 2 to entry: It is expressed in megapascals (MPa).
3.1.5
melt mass-flow rate
MFR
value relating to the viscosity of the molten material at a specified temperature and load
Note 1 to entry: It is expressed in grams per 10 minutes (g/10 min).
3.2 Terms related to service conditions
3.2.1
gaseous fuel
substance that reacts exothermically with oxygen, which is in gaseous state at a temperature of 15 °C and at
atmospheric pressure
Note 1 to entry: The energy contained in the fuel is released when it burns.
Note 2 to entry: Typical gaseous fuels are for example natural gas, methane, butane, propane, hydrogen, manufactured
gas, biogas, ., and mixtures of these gases.
Note 3 to entry: Additional information about the suitability of PE pipe systems for hydrogen and its admixtures can be
found in Annex B.
3.2.2
maximum operating pressure
MOP
maximum effective pressure of the fluid in the piping system, which is allowed in continuous use
Note 1 to entry: It is expressed in bar. It takes into account the physical and the mechanical characteristics of the
components of a piping system. It is calculated using the following formula:
20× MRS
MOP=
C×−()SDR 1
Note 2 to entry: Research on long-term performance prediction of polyethylene gas distribution systems shows a possible
service life of at least 100 years; see References [19], [20] and [21].
3.2.3
design reference temperature
temperature for which the piping system is designed
Note 1 to entry: It is used as the base for further calculation when designing a piping system or parts of a piping system
for operating temperatures different from the design reference temperature (see EN 1555-5).
3.2.4
manufactured gas
synthetic gas
gas which has been treated and can contain components that are not typical of natural gas
Note 1 to entry: Manufactured (synthetic) gases can contain substantial amounts of chemical species that are not typical
of natural gases or common species found in atypical proportions as in the case of wet and sour gases.
Note 2 to entry: Manufactured gases fall into two distinct categories, as follows:
a) those that are intended as synthetic or substitute natural gases, and that closely match true natural gases in both
composition and properties;
b) those that, whether or not intended to replace or enhance natural gas in service, do not closely match natural gases
in composition.
Case b) includes gases such as town gas, coke oven gas (undiluted), and LPG/air mixtures. None of which is compositionally
similar to a true natural gas (even though, in the latter case, it can be operationally interchangeable with natural gas).
[SOURCE: EN ISO 14532:2017, 2.1.1.4]
3.3 Terms related to joints
3.3.1
butt fusion joint
joint made by heating the planed ends of pipes or spigot end fittings, the surfaces of which are fused together
by holding them against a flat heating plate until the polyethylene material reaches fusion temperature,
removing the heating plate quickly and pushing the two softened ends against one another
3.3.2
electrofusion joint
joint between a polyethylene electrofusion socket fitting or electrofusion saddle fitting and a pipe or spigot end
fitting, made by heating the electrofusion fitting by the Joule effect of the heating element incorporated at their
jointing surfaces, causing the material adjacent to them to melt, and the pipe and fitting surfaces to fuse
3.3.3
fusion compatibility
ability of two similar or dissimilar polyethylene compounds to be fused together to form a joint
4 Symbols and abbreviated terms
4.1 Symbols
For the purposes of this document, the following symbols apply.
A surface area
C design coefficient
d nominal outside diameter
n
E wall thickness (at any point) of a fitting and valve body
e wall thickness (at any point) around the circumference of a component
e minimum wall thickness (at any point)
min
e nominal wall thickness
n
strain hardening modulus
p
L length of a pipe
Δp difference in partial pressure
p critical pressure
c
p critical pressure obtained in full-scale test
c,full-scale
p critical pressure obtained in S4-test
cS4
P permeation coefficient
coef
Q mass flow rate
m
Q permeated volume per time unit
V
S pipe series
T wall thickness tolerance
y
t time
θ temperature
ρ density
Δσ stress range
σ design stress
s
σ lower confidence limit of the predicted hydrostatic strength
LPL
4.2 Abbreviated terms
For the purposes of this document, the following abbreviated terms apply.
AFNCT accelerated full notch creep test
ANPT accelerated notched pipe test
CRB cracked round bar (test)
DN/OD nominal size
FNCT full notch creep test
LPL lower predicted limit
LPG liquefied petroleum gas
MFR melt mass-flow rate
MOP maximum operating pressure
MRS minimum required strength
NPT notched pipe test
OIT oxidation induction time
PE polyethylene
PLT point load test
RC raised crack resistance
RCP rapid crack propagation
SCG slow crack growth
standard dimension ratio
SDR
strain hardening test
SHT
5 Material
5.1 Material of the components
The pipes, fittings and valves shall be made of a PE compound conforming to this document.
This document includes materials classified as PE 80 and PE 100.
Another type of PE 100, designated as PE 100-RC with enhanced resistance to SCG, is also included in this
document, see Annex A for additional information.
The material described in this document is a compound, which shall be supplied in the form of granules, suitable
for the production of pipes conforming to EN 1555-2, fittings conforming to EN 1555-3, or valves conforming
to EN 1555-4.
5.2 Compound
5.2.1 Additives and pigments
The compound shall be made by adding to the PE base polymer only those additives and pigments (e.g. carbon
black) necessary for the manufacture of pipes, fittings and valves conforming to EN 1555-2, EN 1555-3 and
EN 1555-4, as applicable, and for their fusibility, storage and use.
The carbon black used in the production of black compound shall have an average (primary) particle size of
10 nm to 25 nm.
All additives and pigments shall be uniformly dispersed.
5.2.2 Colour
The colour of the compound shall be yellow (PE 80), orange (PE 100 and PE 100-RC) or black (PE 80, PE 100
and PE 100-RC).
5.2.3 Characteristics
5.2.3.1 Characteristics of the compound in the form of granules
The compound in the form of granules used for the manufacture of pipes, fittings and valves shall have
characteristics conforming to the requirements given in Table 1.
Table 1 — Characteristics of the compound in the form of granules
a
Characteristic Test parameters Test method
Requirement
Parameter Value
Compound density 3 Test temperature 23 °C EN ISO 1183-1
≥ 930 kg/m
or
Number of test Shall conform
c
EN ISO 1183-2
b to
pieces
EN ISO 1183-1
or
c
EN ISO 1183-2
Oxidation induction ≥ 20 min Test temperature d EN ISO 11357-6
210 °C
time (OIT) (thermal
Test atmosphere Oxygen
stability)
Sample mass (15 ± 2) mg
Number of test 3
b
pieces
Melt mass-flow rate (0,20 ≤ MFR ≤ 1,40) g/10 min Loading mass 5 kg EN ISO 1133-1
(MFR)
Maximum deviation of ±20 %
Test temperature 190 °C
e f
of the nominated value
Time 10 min
Number of test Shall conform
b to
pieces
EN ISO 1133-1
Volatile content ≤ 350 mg/kg Number of test 1 EN 12099
b
(equivalent to ≤ 0,035 % by pieces
mass)
g ≤ 300 mg/kg Number of test 1 EN ISO 15512
Water content
b
(equivalent to ≤ 0,03 % by pieces
mass)
Carbon black (2,0 to 2,5) % (mass fraction) Number of test Shall conform ISO 6964
h b i
content pieces to ISO 6964
Carbon black disper- Grade ≤ 3 Preparation of test j ISO 18553
Free
h pieces
sion Rating of appearance A1, A2,
A3 or B
Number of test Shall conform
b to ISO 18553
pieces
k Grade ≤ 3 Preparation of test j ISO 18553
Pigment dispersion Free
pieces
Rating of appearance A1, A2,
A3 or B
Number of test Shall conform
b to ISO 18553
pieces
Resistance to SCG for ≥ 53,0 MPa Test temperature 80 °C ISO 18488
p
PE 100-RC
Thickness 300 µm
Strain hardening test
Test speed Shall conform
l
(SHT)
to ISO 18488
Number of test Shall conform
b to ISO 18488
pieces
a
Characteristic Test parameters Test method
Requirement
Parameter Value
Resistance to SCG for 6 Test temperature 23 °C ISO 18489
≥ 1,5 × 10 cycles at an inter-
PE 100-RC
polated stress range (Δσ ) of
0 Type of test In air
Cracked round bar
12,5 MPa and converted and
Diameter of test 14 mm
l
(CRB) test normalised to a diameter of
piece
14 mm and an initial crack
m
Reference stress 12,5 MPa
length of 1,40 mm
range
Target initial crack 1,50 mm
length a *
ini
Waveform/ Sinusoid/10 Hz
frequency
Number of test Shall conform
b to ISO 18489
pieces
Resistance to SCG for ≥ 550 h at an interpolated ref- Test temperature 90 °C ISO 16770
PE 100-RC erence tensile stress of
Environment Lauramine ox-
n o
Accelerated FNCT 4 MPa
p
ide
l
(AFNCT) or
Concentration 2 % (mass frac-
≥ 300 h at an interpolated ref-
tion)
erence tensile stress of
n o
5 MPa  Test piece dimension 10 mm square
q Brittle
Failure mode
Number of test Shall conform
b to ISO 16770
pieces
NOTE 1 Chemical Abstracts Service (CAS) Registry Number® is a trademark of the American Chemical Society (ACS).
This information is given for the convenience of users of this document and does not constitute an endorsement by CEN
of the product named. Equivalent products can be used if they can be shown to lead to the same results.
NOTE 2 Arkopal® N100 is an example of a suitable product available commercially. This information is given for the
convenience of users of this document and does not constitute an endorsement by CEN of this product.
NOTE 3 Dehyton® PL is an example of a suitable product available commercially. This information is given for the con-
venience of users of this document and does not constitute an endorsement by CEN of this product.
NOTE 4 The requirement for CRB of 1,5 × 10 cycles is under revision based on the analysis of current round robin

performances.
a
Conformity to these requirements shall be proven by the compound manufacturer.
b
The number of test pieces given indicates the number required to establish a value for the characteristic described in this table.
The number of test pieces required for batch release testing and product verification testing should be listed in the manufacturer’s
quality plan. Guidance on assessment of conformity can be found in CEN/TS 1555-7.
c
EN ISO 1183-3 may be used as alternative. In case of dispute, EN ISO 1183-1 or EN ISO 1183-2 shall apply.
d
Test may be carried out at 200 °C or 220 °C provided that a clear correlation has been established. In case of dispute, the reference
temperature shall be 210 °C. The test may be carried out on melt flow extrudate or pellet. In case of dispute, the test shall be carried
out on pellet. The sample thickness is free and not in accordance with EN ISO 11357-6.
e
Nominated value given by the compound manufacturer.
f
Materials (0,15 ≤ MFR < 0,20) g/10 min may be introduced. In such case 5.3.1 applies. The lowest MFR value resulting from the
maximum lower deviation of the nominated value is to be not less than 0,15 g/10 min.
a
Characteristic Test parameters Test method
Requirement
Parameter Value
g
Volatile or water content shall be measured. In case of dispute, the requirement for water content shall be used, using method B.2
of EN ISO 15512. As an alternative method, ISO 760 [12] may be used. The requirement applies to the compound manufacturer at
the stage of manufacturing and to the compound user at the stage of processing (if the water content exceeds the limit, drying is
required prior to use).
h
Only for black compounds.
i
In case of dispute, Method A “Electric Tube Furnace” shall be used.
j
In case of dispute, the test pieces shall be prepared by the microtome method.
k
Only for non-black compounds.
l
These tests are only performed on PE 100-RC material.
m
For interpolation, CRB test target stress ranges should be chosen between 11,5 MPa and 13,5 MPa. Target stress ranges of
11,5 MPa, 12,2 MPa, 12,8 MPa and 13,5 MPa are recommended. After the test the stress range is to be converted and normalised to
a diameter of 14 mm and an initial crack length of 1,4 mm, in accordance with ISO 18489:2015, Annex A.
n
This requirement correlates to a test in accordance with ISO 16770, with a stress of 4 MPa at 80 °C in nonylphenol ethoxylate with
no failure for a period of 8 760 h [22] and may be used as an alternative. Nonylphenol ethoxylate (CAS Registry Number® 9016–45–
9) with a trade name of Arkopal® N100 is used for this test with a concentration for testing of 2 % (mass fraction). In case of dispute,
the AFNCT applies.
o
AFNCT test stress levels should be chosen close to the nominal stress in order to avoid long testing times. Test stress levels of
3,7 MPa, 3,9 MPa, 4,2 MPa, 4,5 MPa for the 4 MPa reference stress, and 4,7 MPa, 4,9 MPa and 5,2 MPa and 5,5 MPa for the 5 MPa
reference stress are recommended.
p
Lauramine oxide (CAS Registry Number® 85408–49–7) is commercially available as Dehyton® PL. The dilution of the lauramine
oxide in the product shall be taken into account when calculating the concentration of 2 % (mass fraction). For example, when De-
hyton® PL is used, it is already diluted to 30 % (mass fraction). Therefore, 6,67 % (mass fraction) of Dehyton® PL is needed to
obtain 2 %(mass fraction) lauramine oxide.
q
Test specimens tested at a tensile stress of ≥ 4 MPa (or ≥ 5 MPa) may be terminated once the minimum failure time of 550 h (or
300 h) has been achieved, in which case there is no failure mode. Test specimens tested at a tensile stress of < 4 MPa (or < 5 MPa)
may be terminated once the interpolated failure time of 550 h (at the reference tensile stress of 4 MPa) or 300 h (at the reference
tensile stress of 5 MPa) is achieved, taking possible scatter in the actual tensile stress into account.

5.2.3.2 Characteristics of the compound in the form of pipe
Unless otherwise specified by the applicable test method, the test pieces shall be conditioned at (23 ± 2) °C
before testing in accordance with Table 2.
Table 2 — Characteristics of compound in the form of pipe
a
Characteristic Test parameters Test method
Requirement
Parameter Value
Resistance to gas No failure during Conditioning period 1 500 h in air at 23 °C EN ISO 1167-1 and
condensate the test period of (pipe filled with conden- EN ISO 1167-2
all test pieces sate)
End caps Type A
Test temperature 80 °C
Orientation Free
b 3
Number of test pieces
Circumferential (hoop) 2,0 MPa
stress
Pipe dimensions:
d 32 mm
n
3 mm
e
n
Type of test Synthetic condensate
c
internal and water
external to the test
piece (“liquid-in-wa-
ter”)
Test period ≥ 20 h
Resistance to The weathered Preconditioning (weath- 2 EN ISO 16871
≥ 3,5 GJ/m
d e test pieces shall ering): cumulative radi-
weathering
fulfil the require- ant exposure
ments of the fol-
b See below
lowing characteris-
Number of test pieces
tics, a), b) and c)
below:
a) Decohesion of an a) Sample prepared in accordance with ISO 11413:2019, Jointing condi- f
a) ISO 13954
electrofusion joint tion 1: 23 °C; ≤ 33 % brittle failure
d : 110 mm SDR 11
n
b) Hydrostatic b) Shall conform to EN 1555-2:2025, Table 4 b) EN ISO 1167-1
strength (1 000 h at d : 32 mm SDR 11 (preferred) or 110 mm SDR 11 and EN ISO 1167-2
n
80 °C)
c) Elongation at c) Shall conform to EN 1555-2:2025, Table 4 c) EN ISO 6259-1
break d : 32 mm SDR 11 (preferred) or 110 mm SDR 11 and EN ISO 6259-3
n
Resistance to rapid p ≥ 1,5 MOP h d : 250 mm SDR 11 EN ISO 13477
c Pipe dimension n
crack propagation
with
Test temperature 0 °C
(RCP)
p = 3,6 p + 2,6
c cS4
(Critical pressure,
Pressurizing fluid air
g
p )
c
b Shall conform to
Number of test pieces
EN ISO 13477
a
Characteristic Test parameters Test method
Requirement
Parameter Value
Resistance to SCG No failure during Pipe dimension d :110 mm SDR 11 EN ISO 13479
n
for PE 80 and the test period
Test temperature 80 °C
PE 100
Notched pipe test
Internal test pressure
i
for:
(NPT)
PE 80, SDR 11 8,0 bar
PE 100, SDR 11 9,2 bar
Test period ≥ 500 h
Type of test Water internal and
water external to the
test piece (“water-in-
water”)
b Shall conform to
Number of test pieces
EN ISO 13479
Resistance to SCG No failure during Pipe dimension d : 110 mm SDR 11 EN ISO 13479
n
for PE 100-RC the test period
Test temperature 80 °C
Accelerated
notched pipe test
Internal test pressure
j
for:
(ANPT)
PE 100-RC, SDR 11 9,2 bar
Test period k
≥ 300 h
Type of test Water internal and de-
tergent solution exter-
l
nal to the test piece
(“water-in-liquid”)
Shall conform to
b
Number of test pieces
EN ISO 13479
Determination of Test to failure: Pipe dimension d : 110 mm SDR 11 ISO 13953
n
the failure mode in Ductile – pass
Test temperature 23 °C
a tensile test on a Brittle – fail
butt-fusion weld
b Shall conform to
Number of test pieces
ISO 13953
NOTE 1 Chemical Abstracts Service (CAS) Registry Number® is a trademark of the American Chemical Society (ACS).
This information is given for the convenience of users of this document and does not constitute an endorsement by CEN
of the product named. Equivalent products can be used if they can be shown to lead to the same results.
NOTE 2 Arkopal® N100 is an example of a suitable product available commercially. This information is given for the
convenience of users of this document and does not constitute an endorsement by CEN of this product.
NOTE 3 Dehyton® PL is an example of a suitable product available commercially. This information is given for the con-
venience of users of this document and does not constitute an endorsement by CEN of this product.
a
Conformity to these requirements shall be proven by the compound manufacturer.
b
The number of test pieces given indicates the number required to establish a value for the characteristic described in this table.
The number of test pieces required for batch release testing and product verification testing should be listed in the manufacturer’s
quality plan. Guidance on assessment of conformity can be found in CEN/TS 1555-7.
c
50 % n-decane and 50 % (mass fraction) 1–3-5 trimethylbenzene.
a
Characteristic Test parameters Test method
Requirement
Parameter Value
d
Only for non-black compounds.
e 2
For outdoor storage for one year a cumulative radiant exposure of up to 7 GJ/m is valid based on current measurements. Infor-
mation on regional levels of UV radiation can be found on web pages of national authorities e.g. meteorological institutes.
f
Alternatively the strip-bend test according to ISO 21751 [15] or the crush test according to ISO 13955 [14] may be used.
g
If the requirement is not met or S4 test equipment is not available, then (re)testing by using the full-scale test shall be performed
in accordance with EN ISO 13478. In this case: p = p .
c c,full-scale
h
For PE 80 materials, smaller pipe diameters may be used for the RCP test. RCP performance is dependent on wall thickness. Pipe
of thickness ≥ 15 mm shall be tested for RCP performance.
i
This test is not performed on PE 100-RC materials.
j
The ANPT is specifically for testing PE 100-RC materials.
k
This requirement correlates to a test on 110 mm diameter SDR 11 PE 100-RC pipe in accordance with EN ISO 13479, at a pressure
level of 9,2 bar at 80 °C, water-in-water, with no failure in a test period of 8 760 h, and may be used as an alternative [23][24][25]. In
case of dispute, the ANPT applies, see EN ISO 13479:2022, Annex D.
l
Nonylphenol ethoxylate (CAS Registry Number® 9016–45–9) with a trade name of Arkopal® N100 is used for this test with a
concentration for testing using a 2 % (mass fraction) aqueous solution. This detergent will be replaced by lauramine oxide (CAS
Registry Number® 85408–49–7), which is commercially available as Dehyton® PL. The requirement for the ANPT using lauramine
oxide is under development at the time of publication of this document.

5.3 Fusion compatibility
5.3.1 The compounds conforming to Table 1 shall be fusible. The compound manufacturer shall check that
the requirement for the failure mode in a tensile test given in Table 2 is fulfilled for a butt fusion joint. The test
sample shall be prepared by using the parameters specified in ISO 11414:2009, Annex A, at an ambient
temperature of (23 ± 2) °C, from pipes both manufactured from that compound.
Fusion compatibility shall be demonstrated by the compound manufacturer for each compound of their own
product range.
For (0,15 ≤ MFR < 0,20) g/10 min pipe compounds, butt fusion compatibility shall be tested in accordance with
ISO 13953 on pipes d ≥ 200 mm and e > 20 mm instead of the tensile test on d 110 mm pipes as specified in
n n n
Table 2.
For (0,15 ≤ MFR < 0,20) g/10 min pipe compounds, electrofusion compatibility shall be tested using the normal
conditions in accordance with EN 1555-5 on pipes d ≥ 250 mm, SDR 11, with fittings made from PE 100 or
n
PE 100-RC.
5.3.2 Compounds conforming to Table 1 are considered fusible to each other. If requested, the compound
manufacturer shall demonstrate this by checking that the requirement for the failure mode in a tensile test
given in Table 2 is fulfilled for a butt fusion joint prepared by using the parameters as specified in
ISO 11414:2009, Annex A, at an ambient temperature of (23 ± 2) °C from two pipes manufactured from the
compounds from their own range covered by this request.
5.4 Classification and designation
Compounds shall be designated by the type of PE material. The minimum required strength (MRS) shall
conform to Table 3 when tested in the form of pipe.

Table 3 — Classification and designation of compounds
Classification by MRS
Designation
MPa
8 PE 80
PE 100
PE 100-RC
The compound shall be evaluated in accordance with EN ISO 9080 on pipes at least at three temperatures,
where the first temperature is 20 °C, and the second temperature is 80 °C, and the third temperature is free
between 30 °C and 70 °C, to find the σ . The MRS-value shall be derived from the σ and the compound
LPL LPL
shall be classified by the compound manufacturer in accordance with EN ISO 12162.
At 80 °C, there shall be no knee detected in the regression curve at a time t < 5 000 h.
The conformity of the designation of the compound to the classification given in Table 3 shall be demonstrated
by the compound manufacturer.
Where fittings are manufactured from the same compound as pipes, then the material classification shall be the
same as for pipes.
For the classification of a compound intended only for the manufacture of fittings, test pieces in the form of
extruded pipe made from the compound shall be used.
5.5 Design coefficient and design stress
The design coefficient, C, for pipes, fittings and valves for the supply of gaseous fuels shall be greater than or
equal to 2. The maximum value for the design stress, σ , shall be 4,0 MPa for PE 80, and 5,0 MPa for PE 100 and
s
PE 100-RC materials.
Annex A
(informative)
Additional information related to the installation of PE 100-RC systems
A.1 Pipe material
Polyethylene materials have been used for the manufacture of piping systems for gas supply since the 1960s,
offering a corrosion
...