ISO 16750-5:2023
(Main)Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 5: Chemical loads
Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 5: Chemical loads
This document applies to electric and electronic systems and components for vehicles including electric propulsion systems and components with maximum working voltages according to voltage class B. It describes the potential environmental stresses and specifies tests and requirements recommended for the specific mounting location on/in the vehicle. This document describes chemical loads. This document is not intended to apply to environmental requirements or testing for systems and components of motorcycles and mopeds. NOTE Conditions and testing for a continuous contact with chemical agents can be determined from other standards or upon agreement between the customer and the supplier. Systems and their components released for production, or systems and their components already under development prior to the publication date of this document, can be exempted from fulfilling the changes in this edition compared to the previous one.
Véhicules routiers — Spécifications d'environnement et essais de l'équipement électrique et électronique — Partie 5: Contraintes chimiques
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 16750-5
Third edition
2023-07
Road vehicles — Environmental
conditions and testing for electrical
and electronic equipment —
Part 5:
Chemical loads
Véhicules routiers — Spécifications d'environnement et essais de
l'équipement électrique et électronique —
Partie 5: Contraintes chimiques
Reference number
© ISO 2023
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Tests . 2
4.1 General . 2
4.2 Purpose . 2
4.3 General test conditions . 2
4.4 DUT conditioning . 2
4.5 Test agent conditioning . 3
4.6 Application method . 3
4.7 Test conditions . 3
4.8 Procedure . 5
4.9 Requirements . 6
5 Documentation . 6
Bibliography . 9
iii
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 22, Road vehicles, Subcommittee SC 32,
Electrical and electronic components and general system aspects.
This third edition cancels and replaces the second edition (ISO 16750-5:2010), which has been
technically revised.
The main changes are as follows:
— integrating and harmonizing contents from ISO 19453-5:2018 (e.g. change of Table 2);
— reorganization of test conditions and application methods in context (4.6, 4.7);
— addition of application method (4.6, Table 1);
— reconsideration of chemical agents (Clause 5, Table 3).
A list of all parts in the ISO 16750 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.
iv
INTERNATIONAL STANDARD ISO 16750-5:2023(E)
Road vehicles — Environmental conditions and testing for
electrical and electronic equipment —
Part 5:
Chemical loads
1 Scope
This document applies to electric and electronic systems and components for vehicles including electric
propulsion systems and components with maximum working voltages according to voltage class B. It
describes the potential environmental stresses and specifies tests and requirements recommended for
the specific mounting location on/in the vehicle.
This document describes chemical loads.
This document is not intended to apply to environmental requirements or testing for systems and
components of motorcycles and mopeds.
NOTE Conditions and testing for a continuous contact with chemical agents can be determined from other
standards or upon agreement between the customer and the supplier.
Systems and their components released for production, or systems and their components already under
development prior to the publication date of this document, can be exempted from fulfilling the changes
in this edition compared to the previous one.
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 16750-1, Road vehicles — Environmental conditions and testing for electrical and electronic equipment
— Part 1: General
ISO 16750-4, Road vehicles — Environmental conditions and testing for electrical and electronic equipment
— Part 4: Climatic loads
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 16750-1 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/
4 Tests
4.1 General
Components and associated parts that can come into contact with the specified chemical agents shall
be resistant to those agents. The components and associated parts shall be tested with all agents they
are likely to come into contact with, except for those materials which can be shown by documentary
evidence to be immune to the contaminant.
A material is considered to be immune to a contaminant if there is no change in properties sufficient to
affect material performances over the time and at the temperature specified in this clause.
The documentary evidence of immunity shall be provided for any operating conditions that could be
relevant for the DUT, also including the effects of operating temperature and self-heating if deemed
necessary as agreed between the customer and the supplier.
The customer and the supplier shall agree on the type of chemical agents and the manufacturer.
Resistance to the specified chemical agents shall be considered as early as possible during the material
selection process.
4.2 Purpose
The purpose of the test is to determine whether systems/components are unacceptably affected by
temporary exposure to contaminating agents.
NOTE This test is not intended to be a life test.
4.3 General test conditions
Chemical agents shall be selected as defined in Table 2, depending on the mounting location of the DUT.
Unless otherwise specified, one DUT per test agent shall be used.
The following tests describe one test cycle. Unless otherwise specified, one test cycle with one agent
per DUT shall be performed. Any other number of cycles may be agreed between the customer and the
supplier.
During test cycle, the DUT shall be in operating mode 1.2 as defined in ISO 16750-1. Operating mode
1.1 as defined in ISO 16750-1 with protection seals (e.g. sealed mating connector) can be used if agreed
between the customer and the supplier.
NOTE 1 Operating mode with electrical operation can be used if agreed between the customer and the
supplier, and if judged feasible from test setup perspective.
NOTE 2 If the size of the DUT is sufficient, multiple test agents can be applied partially on one DUT provided
that these do not have any influence on each other.
NOTE 3 When only some part of the DUT (e.g. front panel part of audio) is exposed to chemicals, this test can
be performed with the applicable part by agreement between the customer and the supplier. In this case, it is also
relevant to consider sealings, barriers, or other parts of the system that is preventing the exposure of chemical
agents to the hidden parts of the DUT.
4.4 DUT conditioning
Unless otherwise specified, the DUT shall be stored at a room temperature (RT) of (23 ± 5) °C and a
relative humidity (RH) of between 25 % and 75 % until thermal equilibrium is reached.
The DUT shall be tested under conditions of normal use. If necessary, and unless otherwise specified,
unrepresentative coatings or contaminations of the DUT shall be removed.
If a cleaning procedure is needed, the customer and the supplier shall agree on the methodology.
4.5 Test agent conditioning
All test agents shall be stabilised at an RT of (23 ± 5) °C when applied on the DUT.
4.6 Application method
The application method shall be such that the DUT is sufficiently wetted by the chemical agent in the
areas to be tested. Possible application methods are listed in Table 1 as code I to VI. Refer to 4.7 for the
preferred application method (see also Table 2).
Unless otherwise specified, the application method shall be performed at an RT of (23 ± 5) °C and an RH
of between 25 % and 75 %.
Table 1 — Application methods
Code Method Description of method
Spray the chemical agent using for instance a spray bottle. Spray until DUT is
I Spraying
wetted, agent not dripping off.
Apply the chemical agent on a soft brush and then brush the DUT with low force,
II Brushing
brushing until DUT is wetted, agent not dripping off.
For example, wipe with chemical agent wetted but not dripping cotton cloth, wipe
III Wiping
with light finger pressure. Wipe until DUT is wetted, agent not dripping off.
Sprinkle the chemical agent over the DUT using for instance a funnel or dropper.
IV Pouring
Sprinkle until DUT is wetted, agent not dripping off.
V Dipping Completely submerge the DUT for a very short time, i.e. brief immersion.
VI Immersing Completely submerge the DUT until no more air bubbles are emerging.
4.7 Test conditions
Test conditions are given as chemical loads for the DUT which are defined as chemical agent, application
method, test temperature and test duration. The preferred application method in Table 2 shall be
selected depending on chemical agent and the mounting location of the DUT.
Unless otherwise specified, test temperature and test duration in Table 2 shall be applied.
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