Amendment 1 - Environmental testing - Part 2-10: Tests - Test J and guidance: Mould growth

Amendement 1 - Essais d'environnement - Partie 2-10: Essais - Essai J et guide: Moisissures

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Publication Date
24-Apr-2018
Current Stage
PPUB - Publication issued
Completion Date
25-Apr-2018
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IEC 60068-2-10:2005/AMD1:2018 - Amendment 1 - Environmental testing - Part 2-10: Tests - Test J and guidance: Mould growth
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IEC 60068-2-10
Edition 6.0 2018-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BA SIC SAFETY PUBLICATION
PU BLICATION FONDAMENTALE DE SÉCURITÉ
AMENDMENT 1
AMENDEMENT 1
Environmental testing –
Part 2-10: Tests – Test J and guidance: Mould growth
Essais d’environnement –
Partie 2-10: Essais – Essai J et guide: Moisissures
IEC 60068-2-10:2005-06/AMD1:2018-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60068-2-10
Edition 6.0 2018-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BA SIC SAFETY PUBLICATION
PU BLICATION FONDAMENTALE DE SÉCURITÉ
AMENDMENT 1
AMENDEMENT 1
Environmental testing –
Part 2-10: Tests – Test J and guidance: Mould growth
Essais d’environnement –
Partie 2-10: Essais – Essai J et guide: Moisissures
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-5513-1

Warning! Make sure that you obtained this publication from an authorized distributor.

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60068-2-10:2005/AMD1:2018
© IEC 2018
FOREWORD
This amendment has been prepared by IEC technical committee 104: Environmental
conditions, classification and methods of test.
The text of this amendment is based on the following documents:
CDV Report on voting
104/740/CDV 104/790/RVC

Full information on the voting for the approval of this amendment can be found in the report

on voting indicated in the above table.

The committee has decided that the contents of this amendment and the base publication will

remain unchanged until the stability date indicated on the IEC website under

"http://webstore.iec.ch" in the data related to the specific publication. At this date, the

publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
3 General description
Replace the existing Clause 3 with the following new Clause 3:
3 General description
3.1 Background

Under certain climatic and environmental conditions, micro-organisms may settle on and

colonize the surface of electrotechnical equipment. Their presence or their metabolic products

may not only damage the equipment itself, but may also affect the equipment’s operability and

serviceability. The actions of micro-organisms on equipment are influenced by two different

processes: direct action in which the deterioration of material serve as a nutritive substance

for the growth of the micro-organisms and indirect action in which the metabolic products of

the micro-organisms generate deterioration.

The preferred method for controlling the effects of micro-organisms is by the selection of

materials that do not promote growth. Also acceptable is the treatment, or hermetic sealing, of

potentially vulnerable materials and components. Additionally, equipment may not need to be

evaluated if it is stored and/or operated throughout its entire life, in conditions unlikely to

encourage the growth of micro-organisms. Only if these cannot be achieved is it usually

necessary to demonstrate the resistance of complete or partial equipment by testing.

The test procedures and severities of this document are most commonly used to evaluate the

resistance of complete or partial equipment, to the damaging effects due to the presence of

---------------------- Page: 4 ----------------------
IEC 60068-2-10:2005/AMD1:2018 – 3 –
© IEC 2018

micro-organisms and their metabolic products. Testing of entire equipment is usually

necessary if it is critical that performance be demonstrated after exposure to adverse

temperature/humidity conditions that would support the growth of micro-organisms.

An alternative approach which is sometimes used is to consider only the individual materials

of which an equipment is composed. This alternative approach may be particularly relevant

when the primary concern is with deterioration of structural materials of the equipment rather

than its operability and serviceability. In such cases, individual materials may need to be

evaluated, only if previous evidence exists as to its resistance to the effects of growth of

micro-organisms. The testing procedures in ISO 846 are essentially the equivalent of those

set out in this document but applied to specimens comprising samples of material.

Some materials can, when buried in natural soil that has a water holding capacity, exhibit

significant degradation in structural characteristics. The evaluation of such conditions are not

included in this document. However, should the evaluation of material be required, Method D

(soil-burial test) in ISO 846 is suggested. Similarly, if it is necessary to evaluate a material’s

resistance to biological growth, Method C (resistance to bacteria) in ISO 846 is suggested.

3.2 Selection of test procedure

The test procedures of this document involves exposing electrotechnical products to the

action of a selection of test strains of mould spores for a period of incubation under conditions

which promote spore germination and the growth of mould. At the end of the exposure, the

specimens are assessed for deterioration by visual examination and, if applicable, for any

change in mass or other physical properties.
This document contains two basic test procedures Variant 1 and Variant 2:

a) In Variant 1, specimens are inoculated with a mixed suspension of mould spores in the

presence of an incomplete nutritive medium (without a carbon source). The mould can

only grow at the expense of the specimen. If the specimens contain no nutritive

component, the fungi cannot develop mycelia and there is no deterioration of the material.

b) In Variant 2, specimens are inoculated with a mixed suspension of mould spores in a

(complete) nutritive solution, i.e. with a carbon source. Even if the specimen does not

contain any nutritive elements, the mould can grow over the specimen and their metabolic

products can attack the material. Any inhibition of the growth on the specimen shows

fungal activity of the material or the presence of a fungicidal treatment.
3.3 Considerations when specifying test procedures

Surface contamination in the form of dusts, liquids, condensed volatile nutrients or grease

may be deposited upon assembled specimens. This can be brought about by storage and use

or transport with the product exposed to the atmosphere or handled without protective

covering. This surface contamination can cause an increased colonization by fungi and may

lead to greater growth and damage. An assessment of the effect of such contamination can

be given by the application of test Variant 2.
Due to the difficulty of maintaining the necessar
...

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