IEC60335-1
7.14 The markings required by the standard shall be clearly legible and durable.
Compliance is checked by inspection and by rubbing the marking by hand for 15 s with a
piece of cloth soaked with water and again for 15 s with a piece of cloth soaked with
petroleum spirit.
After all the tests of this standard, the marking shall be clearly legible. It shall not be easily
possible to remove marking plates nor shall they show curling.
NOTE 1 In considering the durability of the marking, the effect of normal use is taken into account. For example,
marking by means of paint or enamel, other than vitreous enamel, on containers that are likely to be cleaned
frequently, is not considered to be durable.
NOTE 2 The petroleum spirit to be used for the test is aliphatic solvent hexane having a maximum aromatics
content of 0,1 % by volume, a kauri-butanol value of 29, an initial boiling point of approximately 65 °C, a dry point
of approximately 69 °C and a specific mass of approximately 0,66 kg/l.