SIST EN ISO 23936-4:2024

SLOVENSKI STANDARD
01-december-2024
Naftna in plinska industrija, vključno z nizkoogljično energijo - Nekovinski
materiali v stiku z mediji v povezavi s proizvodnjo nafte in plina - 4. del: Z vlakni
ojačan kompozit (ISO 23936-4:2024)
Oil and gas industries including lower carbon energy - Non-metallic materials in contact
with media related to oil and gas production - Part 4: Fiber-reinforced composite (ISO
23936-4:2024)
Öl- und Gasindustrie einschließlich kohlenstoffarmer Energieträger - Nichtmetallische
Werkstoffe mit Medienkontakt bei der Öl- und Gasproduktion - Teil 4: Verbundwerkstoffe
(ISO 23936-4:2024)
Industries du pétrole et du gaz y compris les énergies à faible teneur en carbone -
Matériaux non métalliques en contact avec les fluides relatifs à la production de pétrole
et de gaz - Partie 4: Composites renforcés de fibres (ISO 23936-4:2024)
Ta slovenski standard je istoveten z: EN ISO 23936-4:2024
ICS:
75.180.01 Oprema za industrijo nafte in Equipment for petroleum and
zemeljskega plina na splošno natural gas industries in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 23936-4
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2024
EUROPÄISCHE NORM
ICS 75.180.01
English Version
Oil and gas industries including lower carbon energy -
Non-metallic materials in contact with media related to oil
and gas production - Part 4: Fiber-reinforced composite
(ISO 23936-4:2024)
Industries du pétrole et du gaz y compris les énergies à Öl- und Gasindustrie einschließlich kohlenstoffarmer
faible teneur en carbone - Matériaux non métalliques Energieträger - Nichtmetallische Werkstoffe mit
en contact avec les fluides relatifs à la production de Medienkontakt bei der Öl- und Gasproduktion - Teil 4:
pétrole et de gaz - Partie 4: Composites renforcés de Verbundwerkstoffe (ISO 23936-4:2024)
fibres (ISO 23936-4:2024)
This European Standard was approved by CEN on 8 September 2024.

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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23936-4:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 23936-4:2024) has been prepared by Technical Committee ISO/TC 67 "Oil and
gas industries including lower carbon energy" in collaboration with Technical Committee CEN/TC 12
“Oil and gas industries including lower carbon energy” 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 March 2025, and conflicting national standards shall
be withdrawn at the latest by March 2025.
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.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations 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.
Endorsement notice
The text of ISO 23936-4:2024 has been approved by CEN as EN ISO 23936-4:2024 without any
modification.
International
Standard
ISO 23936-4
First edition
Oil and gas industries including
2024-09
lower carbon energy — Non-
metallic materials in contact
with media related to oil and gas
production —
Part 4:
Fiber-reinforced composite
materials
Industries du pétrole et du gaz y compris les énergies à faible
teneur en carbone — Matériaux non métalliques en contact avec
les fluides relatifs à la production de pétrole et de gaz —
Partie 4: Matériaux composites renforcés de fibres
Reference number
ISO 23936-4:2024(en) © ISO 2024

ISO 23936-4:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 23936-4:2024(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions and abbreviated terms . 3
3.1 Terms and definitions .3
3.2 Abbreviated terms .4
4 Technical requirements . 5
4.1 General requirements .5
4.2 Cautionary remarks .7
4.3 Traceability .7
4.4 Test specimen identification .7
4.5 Validation of conformity .9
4.6 Quality control for fabrication of laminated test plates .10
4.6.1 General .10
4.6.2 Quality control for fabrication of plates .10
4.7 Test specimen preparation, quality control and identification . 12
4.7.1 Preparation of test specimens . 12
4.7.2 Quality control of specimen preparation . 12
5 Level 1 – Material property characterization .12
5.1 General . 12
5.2 Reporting .14
6 Level 2 - Material stability (short-term) . 14
6.1 General .14
6.2 Test criteria .14
6.2.1 General .14
6.2.2 Exposure temperature . 15
6.2.3 Exposure durations . 15
6.2.4 Test fluids . . . 15
6.2.5 Property test methods . 15
6.2.6 Threshold criteria . 15
6.3 Preconditioning considerations .16
6.4 Reporting .16
7 Level 3 – Material stability (accelerated) .16
7.1 General .16
7.2 Exposure temperatures . .17
7.3 Exposure durations .17
7.4 Exposure fluids .18
7.5 Initial swelling .18
7.6 Property test methods.18
7.7 Threshold criteria .18
7.8 Preconditioning considerations .18
7.9 Evaluation of data for Level 3 .19
7.10 Reporting .19
8 Level 4 – Material stability (long-term) .20
8.1 General requirements for Level 4 evaluation. 20
8.2 Exposure temperatures . 20
8.3 Exposure durations . 20
8.4 Exposure fluids . 20
8.5 Initial swelling . 20
8.6 Property test methods. 20
8.7 Guidance for selection of Level 4 test methods .21

iii
ISO 23936-4:2024(en)
8.8 Preconditioning considerations .21
8.9 Evaluation of data for Level 4 .21
8.10 Threshold baseline .21
8.11 Threshold criteria for composites . 22
Annex A (normative) Test media, conditions, equipment and procedures for ageing of composite
materials .23
Annex B (normative) Fabrication of laminated plates .40
Annex C (normative) Specimen extraction from laminated plates .45
Annex D (normative) Quality control and documentation of laminate and thermoplastic UD-
tape .49
Annex E (informative) Considerations for short-term thermomechanical evaluation and
qualification .53
Annex F (informative) Selecting elevated temperatures for accelerated tests .54
Bibliography .56

iv
ISO 23936-4:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 67, Oil and gas industries including lower carbon
energy, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/
TC 12, Oil and gas industries including lower carbon energy, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
A list of all parts in the ISO 23936 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

v
ISO 23936-4:2024(en)
Introduction
Non-metallic materials are used in the petroleum, petrochemical and natural gas industries for a wide range
of components. The purpose of this document is to establish requirements and guidelines for systematic and
effective planning, for non-metallic material selection to achieve cost effective technical solutions, taking
into account possible constraints due to safety and/or environmental issues.
This document is of benefit to a broad industry group ranging from operators and suppliers to engineers
and authorities. It covers relevant generic types of non-metallic material (e.g. thermoplastics, elastomers,
thermosetting plastics) and includes the widest range of existing technical experience.
This information aids in material selection. It can be applied to help avoid costly degradation failures
of the equipment itself, which can pose a risk to the health and safety of the public and personnel or the
environment. This document complements the document for metallic materials in sour service (the
ISO 15156 series). It differs in the form of guidance provided to the user related to the potential degradation
of desired properties when used in equipment for oil and gas production environments. The ISO 15156
series provides application limits and qualification requirements for metallic materials in H S-containing
environments which are related solely to relevant environmentally assisted cracking mechanisms.
Mechanical properties and the environmental stability of composite materials depend on the properties and
environmental stability of matrix resins, fibres and fibre/resin bonding interfaces. This document focuses
on the overall composite properties and their environmental stability. To permit this assessment this
document utilizes flat plates and/or tubular shapes made specifically for these tests.
The document recognizes that a wider range of compounds and parameters influence the degradation of
non-metallic materials and thus provides guidance to permit selection of materials for oil and gas exploration
and production applications based upon stability in appropriate test conditions.

vi
International Standard ISO 23936-4:2024(en)
Oil and gas industries including lower carbon energy — Non-
metallic materials in contact with media related to oil and gas
production —
Part 4:
Fiber-reinforced composite materials
CAUTION — Non-metallic materials selected using the ISO 23936 series are resistant to the given
environments in the petroleum and natural gas industries, but not necessarily immune under all
service conditions. This document allocates responsibility for suitability for the intended service in
all cases to the equipment user.
1 Scope
This document provides general principles, requirements and recommendations for the assessment of
stability of fibre-reinforced composite materials for service in equipment used in oil and gas production
environments.
This document describes the procedures for comparative testing of composite materials consisting of
polymers (thermoplastics and thermosets) and re-enforcing materials e.g. glass, carbon, aramid and metals
as continuous fibres or woven fabric used in equipment for oil and gas production.
Testing and characterization of neat resins and fibre products are beyond the scope of this document.
The equipment considered includes, but is not limited to, non-metallic pipelines, piping, liners and downhole
tool components.
Blistering by rapid gas decompression, coatings and compounded particulate- and short fibre-reinforced
composites are excluded from the scope of this document.
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.
ISO 175, Plastics — Methods of test for the determination of the effects of immersion in liquid chemicals
ISO 527-4, Plastics — Determination of tensile properties — Part 4: Test conditions for isotropic and orthotropic
fibre-reinforced plastic composites
ISO 527-5, Plastics — Determination of tensile properties — Part 5: Test conditions for unidirectional fibre-
reinforced plastic composites
ISO 1172, Textile-glass-reinforced plastics — Prepregs, moulding compounds and laminates — Determination of
the textile-glass and mineral-filler content using calcination methods
ISO 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion method,
liquid pycnometer method and titration method
ISO 1268-1, Fibre-reinforced plastics — Methods of producing test plates — Part 1: General conditions
ISO 1268-3, Fibre-reinforced plastics — Methods of producing test plates — Part 3: Wet compression moulding

ISO 23936-4:2024(en)
ISO 1268-4, Fibre-reinforced plastics — Methods of producing test plates — Part 4: Moulding of prepregs
ISO 1268-5, Fibre-reinforced plastics — Methods of producing test plates — Part 5: Filament winding
ISO 1268-7, Fibre-reinforced plastics — Methods of producing test plates — Part 7: Resin transfer moulding
ISO 1268-9, Fibre-reinforced plastics — Methods of producing test plates — Part 9: Moulding of GMT/STC
ISO 2781, Rubber, vulcanized or thermoplastic — Determination of density
ISO 6721-11, Plastics — Determination of dynamic mechanical properties — Part 11: Glass transition
temperature
ISO 7822, Textile glass reinforced plastics — Determination of void content — Loss on ignition, mechanical
disintegration and statistical counting methods
ISO 11357-2, Plastics — Differential scanning calorimetry (DSC) — Part 2: Determination of glass transition
temperature and step height
ISO 14126, Fibre-reinforced plastic composites — Determination of compressive properties in the in-plane
direction
ISO 14127, Carbon-fibre-reinforced composites — Determination of the resin, fibre and void contents
ISO 14129, Fibre-reinforced plastic composites — Determination of the in-plane shear stress/shear strain
response, including the in-plane shear modulus and strength, by the plus or minus 45 degree tension test method
ISO 14130, Fibre-reinforced plastic composites — Determination of apparent interlaminar shear strength by
short-beam method
ISO 15024, Fibre-reinforced plastic composites — Determination of mode I interlaminar fracture toughness, G ,
IC
for unidirectionally reinforced materials
ISO 15114, Fibre-reinforced plastic composites — Determination of the mode II fracture resistance for
unidirectionally reinforced materials using the calibrated end-loaded split (C-ELS) test and an effective crack
length approach
EN 2564, Aerospace series – Carbon fibre laminates – Determination of the fibre, resin and void contents
ASTM D792, Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by
Displacement
ASTM E1131, Standard Test Method for Compositional Analysis by Thermogravimetry
ASTM D2290, Standard Test Method for Apparent Hoop Tensile Strength of Plastic or Reinforced Plastic Pipe
ASTM D2344, Standard Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their
Laminates
ASTM D2412, Standard Test Method for Determination of External Loading Characteristics of Plastic Pipe by
Parallel-Plate Loading
ASTM D3039, Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials
ASTM D3171, Standard Test Methods for Constituent Content of Composite Materials
ASTM D3410, Standard Test Method for Compressive Properties of Polymer Matrix Composite Materials with
Unsupported Gage Section by Shear Loading
ASTM D3418, Standard Test Method for Transition Temperatures and Enthalpies of Fusion and Crystallization of
Polymers by Differential Scanning Calorimetry
ASTM D3518, Standard Test Method for In-Plane Shear Response of Polymer Matrix Composite Materials by
Tensile Test of a ±45° Laminate

ISO 23936-4:2024(en)
ASTM D5229, Standard Test Method for Moisture Absorption Properties and Equilibrium Conditioning of
Polymer Matrix Composite Materials
ASTM D5379, Standard Test Method for Shear Properties of Composite Materials by the V-Notched Beam Method
ASTM D5448, Standard Test Method for Inplane Shear Properties of Hoop Wound Polymer Matrix Composite
Cylinders
ASTM D5449, Standard Test Method for Transverse Compressive Properties of Hoop Wound Polymer Matrix
Composite Cylinders
ASTM D5450, Standard Test Method for Transverse Tensile Properties of Hoop Wound Polymer Matrix Composite
Cylinders
ASTM D5528, Standard Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Fiber-
Reinforced Polymer Matrix Composites
ASTM D6641, Standard Test Method for Compressive Properties of Polymer Matrix Composite Materials Using a
Combined Loading Compression (CLC) Test Fixture
ASTM D7028, Standard Test Method for Glass Transition Temperature (DMA Tg) of Polymer Matrix Composites
by Dynamic Mechanical Analysis (DMA)
ASTM D7078, Standard Test Method for Shear Properties of Composite Materials by V-Notched Rail Shear Method
ASTM D7905, Standard Test Method for Shear Properties of Composite Materials by V-Notched Rail Shear Method
Standard Test Method for Determination of the Mode II Interlaminar Fracture Toughness of Unidirectional Fiber-
Reinforced Polymer Matrix Composites
NPL (2020) Measurement Good Practice Guide No. 38, Fibre Reinforced Plastic Composites – Machining of
1)
Composites and Specimen Preparation; National Physical Laboratory (UK)
3 Terms and definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions 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/
3.1.1
composite material
fibre-reinforced material system consisting of thermoplastic or thermoset polymers and reinforcing
materials in the form of long and continuous glass, carbon and/or aramid fibres or woven fabric
3.1.2
fabricator
producer of test plates and specimens
1) Available at www .npl .co .uk.

ISO 23936-4:2024(en)
3.1.3
glass transition temperature
T
g
characteristic value of the temperature range over which the glass transition takes place and at which the
composite material's (3.1.1) mechanical properties change from elastic (glassy) state to viscous (rubbery) state
Note 1 to entry: The assigned glass transition temperature (T ) may vary, depending on the specific property and
g
on the method and conditions selected to measure it [for instance, by differential scanning calorimetry (DSC) or by
dynamic mechanical analysis (DMA)].
3.1.4
lamina
ply
thin, single sheet of long and continuous reinforcing fibres sharing the same orientation in a polymeric resin
matrix built up into a flat or curved arrangement
3.1.5
laminate
combination of laminas (3.1.4)
3.1.6
manufacturer
producer of the materials used for creation of semi-finished and/or finished products
3.1.7
sizing
optional treatments usually applied to yarn by manufactures (3.1.6) for reasons that can include increasing
fibre-matrix compatibility, as well as facilitating handling during manufacture
3.1.8
wet T
g
glass transition temperature (3.1.3) of the fluid saturated material
3.2 Abbreviated terms
ATM accelerated testing method
CA autoclave cured
CH hot-press cured
CNC computerized numerical control
CO oven cured
COA certificate of analysis
COC certificate of conformity
COV coefficient of variation
CU UV cured
DMA dynamic mechanical analysis
DSC differential scanning calorimetry
GFRP glass fibre reinforced polymer
GMT glass fibre mat reinforced thermoplastic

ISO 23936-4:2024(en)
HDT heat deflection temperature
HPHT high-pressure high-temperature
IPS in plane shear
LF filament winding lamination
LP prepreg lamination
LR vacuum-assisted resin-transfer moulding
LW wet layup lamination
MOL material operational limit
NDT non-destructive testing
PA Polyamide
ppm (vol) volume parts per million volume parts
QC quality control
QD quality documentation
SEM scanning electron microscopy
STC sheet thermoplastic composite
TA autoclave consolidation
TI isothermal consolidation
TP hot pressing
TGA thermogravimetric analysis
UD unidirectional
UV ultraviolet light
4 Technical requirements
4.1 General requirements
Composite selection depends upon material property characteristics and fluid ageing behaviour. This
document establishes four levels of testing for the purpose of comparing the properties of various composite
materials. The testing methods at the material level shall focus upon the laminate and specimen geometry
and do not represent a functional application test which is beyond the scope of this document. The specimen
layup described is to provide a consistent, common basis for generating comparable data for different
composite materials. Specific testing shall be required for the actual layup for samples representative of the
final product form. Material property data are generated at the four levels to allow consistent comparison
of the subject materials. Generic data shall be derived per Level 1 and Level 2 including threshold criteria,
solely for the purpose of producing information for preselection. Where the user requires accelerated ageing

ISO 23936-4:2024(en)
material stability data in a multi-phase H S containing fluid, Level 3 shall apply. Where the user requires the
material stability data beyond 56 days and an attempted long-term life estimation, Level 4 shall apply.
NOTE Ageing of composites faces combined challenges. Polymer or thermoset ageing alone deals in most
cases with quasi-isotropic material properties. Composites of any configuration furthermore deal with polymeric
challenges as well as with highly anisotropic properties resulting from fibre and interface properties, which can age
very differently than the matrix material. All effects can overlay and become apparent in different failure modes or
shifts thereof over the ageing period.
Ageing experiments can be designed in the following way to extract meaningful information, especially with regards
to establishing lifetime models with these complex effects in mind:
a) identify possible ageing mechanisms for matrix material;
b) identify possible ageing mechanisms for fibre material;
c) identify possible ageing mechanisms for interface;
d) differentiate between physical and chemical ageing;
e) differentiate between reversible and irreversible ageing;
f) identify probabilities for the above-mentioned mechanisms to occur simultaneously during test periods;
g) rank mechanisms for severity;
h) rank for material characterization or application related testing;
i) exclude any unwanted ageing mechanism by physical/chemical exclusion of other ageing influences (monitored
and protocolled), choosing variations in layup to promote specific failure, or some combination of both.
Level 1 conformity consists of the characterization and documentation of material properties in a material
data report. It includes a COC for batch quality control testing. See 5.1 and Table 2 for a list of the required
material properties to be documented. Physical and mechanical properties shall be characterized on
materials in their unaged condition. These standard properties assist with the selection of materials that
meet a design specification. Some property tests are also used for quality assurance and control. Level 1
testing establishes a baseline for higher level testing.
Level 2 conformity pertains to material stability (ageing) behaviour and shall be accompanied by a report.
Clause 6 provides requirements for Level 2 conformity. The effect of the first three fluids listed in 6.2.4 on
material properties shall be investigated with real time ageing studies. A material’s resistance to chemical/
physical/mechanical change is determined.
Level 3 conformity pertains to material stability (accelerated ageing) behaviour and shall be accompanied
by a report. Clause 7 provides requirements for Level 3 conformity. The effects on material properties of
three temperature aging evaluations shall be investigated. The intent of Level 3 evaluations is to accelerate
material property changes specifically in multi-phase H S-fluids.
Level 4 conformity pertains to a material stability (long-term) assessment of 180 days or longer. Level 4
attempts life estimation and shall be accompanied by a report. Clause 8 provides requirements for Level
4 conformity. The intent of Level 4 assessment is to predict the material’s progressive degradation; hence
conformity threshold recommendations are offered for life estimation purposes. The report shall include
a thorough account of data analysis, extrapolation, life estimation, and statistical confidence. Users shall
evaluate the threshold criteria, life estimation results and all methodology to determine the suitability of
materials for application.
All reports shall detail the testing and analysis that was performed as well as the edition of this document
utilized at time of testing.
Laboratory studies using standard test conditions may not derive data that can be used for design purposes.
The user may require fit-for-purpose testing or alternative testing to simulate production conditions to
allow materials selection for final application. Component functional testing is not detailed in this document.

ISO 23936-4:2024(en)
If there is scientific evidence on resistance of the material to the chemicals at the intended pressure and
temperatures then such material may be exempt from Level 3 and Level 4.
4.2 Cautionary remarks
Designers should not assume that properties provided in a material data report as defined in Clause 5
accurately represent those properties found in finished product geometries. The method of conversion is
known to have an impact on these properties and that impact should be accounted for during design.
Life estimation usefulness and certainty can increase when longer term data are used to establish the
degradation trend. Level 3 testing at durations up to 56 days are most useful for shorter term (up to 1 year)
life estimations and can have reduced certainty for long-term (greater than 1 year) life estimations. Level
4 testing requires up to 180 day or longer data in an effort to create higher certainty in long-term life
estimation.
In some cases, progressive degradation of composites over long periods of time at temperatures well above
the target service temperature is not observed. The data and the attempted life estimation are still valuable
because they demonstrate material stability in that test environment.
4.3 Traceability
For a final component to maintain its ISO 23936-4 material conformity, it shall be made from a composite
material that conforms with this document. The entire compound manufacturing process shall be fully
traceable. conformity records shall state the edition of this document used in the assessment. Reference
to conformity with the ISO 23936 series shall include the part and edition (year) of the standard used e.g.
ISO 23936-4:2024.
Each component and accompanying COC shall be traceable back to the compound manufacturer. Each
company that participates in the manufacture of a compound that conforms with this document shall
maintain traceability records for a minimum of 10 years that include its own manufacturing procedures,
locations, and dates.
Further requirements on conformity and traceability over the supply chain can be found in relevant product
standards and agreed between interested parties.
4.4 Test specimen identification
The specimen fabrication details shall be reported using the following identification code system. If the type
of fibre or resin is a new class not covered below, the full designation shall be added in the datasheet.
a) Material system:
A.1 Type of reinforcement fibre (e.g. carbon: CF, E-glass: EG, ECR-glass: ECR, S-glass: SG, aramid: AR,
information regarding sizing and any additives, fibre modulus and precursor, bundle type, linear weight,
tow size and type of weave, whenever applicable) and its grade should be included if made available.
Designations for carbon, glass and aramid fibres can be provided according to ISO 13002, ASTM D578/
D578M-23 and the EN 13003 series, respectively.
NOTE Discontinuous (short) fibre reinforced composites like veils composites are covered in ISO 23936-1.
...