IEC 60068-2-74:1999/AMD1:2018

IEC 60068-2-74 ®
Edition 1.0 2018-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BA SIC SAFETY PUBLICATION
PU BLICATION FONDAMENTALE DE SÉCURITÉ

AMENDMENT 1
AMENDEMENT 1
Environmental testing –
Part 2-74: Tests – Test Xc: Fluid contamination

Essais d’environnement –
Partie 2-74: Essais – Essai Xc: Contamination par des fluides

IEC 60068-2-74:1999-06/AMD1:2018-04(en-fr)

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IEC 60068-2-74 ®
Edition 1.0 2018-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BA SIC SAFETY PUBLICATION
PU BLICATION FONDAMENTALE DE SÉCURITÉ

AMENDMENT 1
AMENDEMENT 1
Environmental testing –
Part 2-74: Tests – Test Xc: Fluid contamination

Essais d’environnement –
Partie 2-74: Essais – Essai Xc: Contamination par des fluides

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-5628-2

– 2 – IEC 60068-2-74:1999/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
104/739/CDV 104/791/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• withdrawn,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.
_____________
2 Normative references
Replace the reference to ISO 1817:1985 with the following new reference:
ISO 1817:2015, Rubber, vulcanized or thermoplastic – Determination of the effect of liquids

3.1 Specification of test fluid
Replace the existing text with the following new text:
The relevant specification (see Clause 12) shall specify the required test fluids which shall
wherever possible be selected from the list given in Table 1. Each fluid has been specified as
being representative of a group of fluids. (See Clause A.2.) The actual composition of some of
the fluids specified in Table 1 are provided for information in Table 2 and Table 3.
The relevant specification shall also specify any additional fluids not listed in Table 1 for
which a test is required.
© IEC 2018
3.2 Precaution
Table 1 – Major contaminant fluid groups and test fluids
Replace Table 1 with the following new Table 1:
Table 1 – Major contaminant fluid groups and test fluids
d e
Contaminant fluid group Test fluid Test fluid Test
(See Annex A for description of reference temperature
c
contamination fluids including (± 2 °C)
environmental and toxicological
aspects.)
Kerosene
ISO 1817:2015, Test liquid F
(turbine) fuel a
(a) 70
(see Table 2)
Fuels Diesel fuel
Gasoline (piston ISO 1817:2015, Test liquid B
a
(b) 40
engine) fuel (see Table 2)
NATO H-520 (ON-18)
Mineral oil based (c) 70
(or as an alternative NATO H-515)
Phosphate ester
ISO 1817:2015, Test liquid 103
based (d) 70
(see Table 3)
Hydraulic fluids (synthetic)
Dimethyl silicone fluid grade 10
(10 mm /s (cSt) at 25 °C)
Silicone based (e) 70
NATO S-1714 (Joint Service designation
ZX-42)
SAE 10W/30
Mineral based (f) NATO O-1176 (Joint Service designation 70
OMD 90)
Lubricating oils
Ester based ISO 1817:2015, Test liquid 101
(g) 150
(synthetic) (see Table 3)
Propan-2-ol (isopropyl alcohol);
a
(h) CAS No 67-63-0, 50
(BS 1595-1, ASTM D770 and DIN 53245)
Solvents and cleaning fluids
(i) Denatured alcohol (methylated spirits) 23
(j) Detergent 23
Inhibited ethanediol (ethylene glycol) CAS
(k) No 107-21-1 with a volume fraction of 23
80 % in water
De-icing and antifreeze fluids
Inhibited ethanediol (ethylene glycol) CAS
(l) No 107-21-1 with a volume fraction of 23
50 % in water
Ethylene glycol CAS No 107-21-1
(m) 23
(25 % urea / 25 % ethylene glycol in
Runway de-icers water)
Potassium acetate CAS No 127-822-2
(n) 23
50 % inhibited potassium acetate in water
Dichlorvos (DDVP) pyrethrum based,
CAS No 62-73-7
(o) 23
(2 % solution in kerosene CAS No 8008-
20-6)
Insecticides
D – phenothrin CAS No 26002-80-2
(p) 2 % solution in kerosene CAS No 8008- 23
20-6
Silicate ester dielectric heat transfer fluid
Coolant dielectric fluids (q) 70
TM b
(commercial product “Coolanol 25R ” )

– 4 – IEC 60068-2-74:1999/AMD1:2018
© IEC 2018
d e
Contaminant fluid group Test fluid Test fluid Test
(See Annex A for description of reference temperature
c
contamination fluids including (± 2 °C)
environmental and toxicological
aspects.)
Fluoroprotein foam
(r) 23
(NATO Stock #4210 99 224 6854)
Fire extinguishants
Aqueous film forming foam (AFFF)
(s) 23
containing fluorochemical surfactants
a
The indicated temperature exceeds the critical flash point temperature.
b TM
Coolanol 25R is the tradename of a product supplied by ExxonMobil. This information is given for the
convenience of users of this document and does not constitute an endorsement by IEC of the product
named. Equivalent products may be used if they can be shown to lead to the same results.
c
See Clauses 8, 9, 10 and A.7.
d
Wherever possible the fluid given is specified in an international standard or is described by its constituent
chemicals. In some cases a NATO identification has been used in preference to a commercial identification.
Reference to the relevant commercial literature can correlate to the NATO number with commercially
available fluids.
e
CAS No. refers to Chemical Abstracts Service Number (www.cas.org).

Add, after Table 1, the following new Table 2 and Table 3:
Table 2 – Standard simulated fuels
Content
ISO 1817:2015 CAS Registry
Liquid constituents % (by Application
Test fluid Number
volume)
2,2,4-trimethylpentane 70 540-84-1 Liquid B is intended to
simulate petroleum-
B
derived fuels without
toluene 30 108-88-3
oxygen compounds.
straight-chain paraffins Liquid F is intended to
80 68476-34-6
(C12 to C18) simulate diesel fuel,
F domestic heating oils
and similar light
1-methylnaphthalene 20 90-12-0
furnace oils.
Table 3 – Simulated service liquids
ISO 1817:2015, Content CAS Registry
Liquid constituents Application
Test fluid % (by mass) Number
di-2-ethylhexyl sebacate 99,5 122-62-3 Intended to simulate
101 synthetic diester-type
phenothiazine 0,5 92-84-2
lubricating oils.
Intended to simulate
phosphate-ester
103 tri-n-butyl phosphate 100 126-73-8
hydraulic oils used in
aircraft.
© IEC 2018
Annex A
A.2 Contaminating fluids and their effects
Replace Clause A.2 with the following new Clause A.2:
A.2 Contaminating fluids and their effects
A.2.1 General
Components and equipment may be subject to contamination by fluids, either through normal
operation, accidental spillage or through leakage, for example from faulty pipes or pipe joints.
The contaminating fluid may not be at an elevated temperature, but a component or
equipment may become contaminated whilst it is at its elevated working temperature or it may
attain such a temperature after having been contaminated. Any effect may thus depend upon
the behaviour of the contaminant at elevated temperature, for example if it is volatile it may
disappear rapidly. If it is non-volatile and oxidizes slowly, a hard residue may remain.
Effects which may occur include packaging failure, crazing or swelling of plastics and rubbers,
leaching of anti-oxidants and other soluble materials, seal failure, adhesion failures, paint
legend removal and corrosion.
A number of standards exist which, although not referred to in this part of IEC 60068 in a
normative capacity, may be used in an informative capacity by specification writers (see
Clause A.10).
A.2.2 Fuels
Fuels vary widely in composition even within the same grade and from the same source.
Hydrocarbon-based fuels will, for the most part, be of the gasoline or kerosene type. The
grade of gasoline is improved by adding aromatic or oxygen-containing compounds, but these
additives increase the effect of fuels on normally fuel-resistant material. The composition
varies with the situation on the gasoline market, with the geographical area and can change
rapidly. Gasoline may be expected to evaporate rapidly, possibly with few permanently
harmful effects. However, kerosene may be more persistent and damage elastomers,
particularly at elevated temperatures. Fuels do not normally affect paints and most plastics,
but silicone resin bonded boards may tend to de-laminate after prolonged exposure
...