IEC 63522-35:2025

IEC 63522-35 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –
Part 35: Resistance to cleaning solvents

Relais électriques – Essais et mesurages –
Partie 35: Résistance aux solvants de nettoyage
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IEC 63522-35 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –

Part 35: Resistance to cleaning solvents

Relais électriques – Essais et mesurages –

Partie 35: Résistance aux solvants de nettoyage

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.70  ISBN 978-2-8327-0232-1

– 2 – IEC 63522-35:2025 © IEC 2025
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references. 5
3 Terms and definitions . 5
4 Test procedure . 6
4.1 General . 6
4.2 Procedure . 6
4.3 Conditions. 7
4.3.1 General . 7
4.3.2 Ambient environment conditions . 7
4.3.3 Solvents to be used . 7
4.3.4 Solvent temperature . 7
4.3.5 Test method . 7
5 Evaluation . 8
5.1 General . 8
5.1.1 Visual inspection . 8
5.1.2 Final measurements . 8
5.2 Test report . 9
Bibliography . 10

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL RELAYS – TESTS AND MEASUREMENTS –

Part 35: Resistance to cleaning solvents

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
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shall not be held responsible for identifying any or all such patent rights.
IEC 63522-35 has been prepared by IEC technical committee 94: Electrical relays. It is an
International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
94/1087/FDIS 94/1135/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

– 4 – IEC 63522-35:2025 © IEC 2025
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts of IEC 63522 series, published under the general title Electrical relays can be
found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
ELECTRICAL RELAYS – TESTS AND MEASUREMENTS –

Part 35: Resistance to cleaning solvents

1 Scope
This document is used for testing all kind of relays within the scope of technical committee 94
and evaluates their ability to perform under expected conditions of transportation, storage and
all aspects of operational use.
This document defines a standard test method for resistance to cleaning solvents.
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.
IEC 60068-2-45:1980, Basic environmental testing procedures – Part 2-45: Tests – Test XA
and guidance: Immersion in cleaning solvents
IEC 60068-2-45:1980/AMD1:1993
IEC 63522-0, Electrical relays – Tests and measurements – Part 0: General and guidance
IEC 63522-1, Electrical relays – Tests and measurements – Part 1: Visual inspection and check
of dimensions
IEC 63522-4, Electrical relays – Tests and measurements – Part 4: Dielectric strength test
IEC 63522-7, Electrical relays – Tests and measurements – Part 7: Functional tests
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 63522-0 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
___________
Under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-1:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-4:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-7:2024.

– 6 – IEC 63522-35:2025 © IEC 2025
3.1
marking
identification of a relay which, when completely given to the manufacturer of this relay, allows
the unambiguous indication of its electrical, mechanical, dimensional and functional parameters
EXAMPLE Through the indication of the trademark and the type designation on the relay, all relay-specific data can
be derived from the type code.
3.2
ink marking
marking created by using ink, paint, or other pigment
3.3
laser marking
marking created by using a laser to ablate or melt the relay surface, to bond a contrasting
labelling material, or to activate a pigmented coating
3.4
moulded marking
marking created by using the process of moulding
3.5
legibility
ability of a character or symbol to be read or deciphered
4 Test procedure
4.1 General
The resistance to cleaning solvents test is to ensure that the marking legibility of relay can be
guaranteed after immersion in either cleaning solvents or subjection to manual handling, or
both, and that no damage, as visually inspected, has occurred.
When using solvents other than water (e.g. petroleum, mixture of organic hydrocarbons and
alcohols) for the test, at least the following safety precautions shall be observed because these
solvents exhibit some potential for health and safety hazards:
• Avoid contact with eyes and prolonged contact with skin;
• Provide adequate ventilation and avoid inhalation of vapours;
• Avoid exposure to open flame or hot surface;
• Solutions are to be kept in covered vessels when not in direct use.
4.2 Procedure
This test procedure applies only for ink marking.
NOTE This test has no influence on laser or moulding marked DUTs.
DUTs shall be representative of production in an as-shipped condition and shall not be
subjected to any cleaning or surface treatment process prior to test.
Before testing, the DUTs shall be subjected to the atmospheric conditions defined in 4.3.1 for
sufficient time to allow them to reach thermal equilibrium.
Before testing the DUTs shall be visually inspected according to IEC 63522-1, the relevant
specification can also require either the electrical or mechanical measurements, or both.

The DUTs shall then be subjected to the test procedure with the method selected from 4.3.4.
If either final electrical or mechanical measurements, or both, are required for evaluation, after
removal from the solvent the DUTs shall remain under the atmospheric conditions defined in
4.3.1 for not less than 1 h and not more than 2 h, or for a period as prescribed in the relevant
specification.
4.3 Conditions
4.3.1 General
The test shall be carried out under the conditions defined in 4.3.2 to 4.3.5. Deviations from
these conditions may be specified and are subject to the agreement of manufacturer and
customer, details of the deviation shall be documented in the test report.
4.3.2 Ambient environment conditions
The test shall be carried out under the following atmospheric conditions:
• Temperature: 23 °C ± 5 °C
• Relative humidity: 25 % to 75 %
• Air pressure: 86 kPa to 106 kPa
4.3.3 Solvents to be used
Demineralized or distilled water shall be used for test method A and B.
Demineralized or distilled water and petroleum shall be used for test method C.
The demineralized or distilled water shall have a resistivity of not less than 500 Ωm
corresponding to a conductivity of 2 mS/m.
NOTE The petroleum spirit used is defined as an aliphatic solvent hexane with a content of aromatics of maximum
0,1 volume %, a kauributanol-value of 29, initial boiling point approximately 65 °C, dry point approximately 69 °C and
specific gravity of 0,68 g/cm .
4.3.4 Solvent temperature
For test method A and B, the temperature of solvent is 55 °C ± 5 °C.
For test method C, the temperature of solvent(s) is same as the ambient environment.
When solvents other than those defined in 4.3.2 are used for test, the temperature of solvents
shall be prescribed by the manufacturer considering the recommended temperature for cleaning
specified by the solvent supplier.
4.3.5 Test method
4.3.5.1 Method A
The test shall be conducted in accordance with IEC 60068-2-45:1980, 5.1, the rubbing material
shall be specified by manufacturer. The solvent shall not be agitated during the test.
4.3.5.2 Method B
The test shall be conducted in accordance with IEC 60068-2-45:1980, 5.2. The solvent shall
not be agitated during the test.

– 8 – IEC 63522-35:2025 © IEC 2025
4.3.5.3 Method C
The test indicated below is applicable to ink marking only and shall be done by rubbing the
marking by hand as follows:
a) 15 back-and-forth movements in about 15 s with a piece of cloth soaked with distilled water,
followed by
b) 15 back-and-forth movements in about 15 s with a piece of cloth soaked with petroleum
spirit.
During the tests, the soaked piece of cloth shall be pressed on the marking area with a force
from 2 N to 5 N.
5 Evaluation
5.1 General
A final evaluation of the test shall be done as specified in 5.1.1 and 5.1.2.
5.1.1 Visual inspection
The visual inspection after test shall be carried out according to IEC 63522-1, any of the
following marking defects which render the marking illegible or unreadable shall be cause for
rejection (some of these defects cannot apply to all marking types).
• Bridging: e.g. a portion of the character is bridged by excess ink, yielding an unintended
character;
• Distorted marking: e.g. a character or symbol appears wavy, or undul
...