EN 60068-2-70:1996

SLOVENSKI STANDARD
01-september-2001
Environmental testing - Part 2: Tests - Test Xb: Abrasion of markings and
letterings caused by rubbing of fingers and hands
Environmental testing -- Part 2: Tests - Test Xb: Abrasion of markings and letterings
caused by rubbing of fingers and hands
Umweltprüfungen -- Teil 2: Prüfungen - Prüfung Xb: Prüfung der Beständigkeit von
Kennzeichnungen und Aufschriften gegen Abrieb, verursacht durch Wischen mit Fingern
und Händen
Essais d'environnement -- Partie 2: Essais - Essai Xb: Effacement des marquages et
inscriptions par friction des doigts et des mains
Ta slovenski standard je istoveten z: EN 60068-2-70:1996
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
INTERNATIONALE
IEC
60068-2-70
INTERNATIONAL
Première édition
STANDARD
First edition
1995-12
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Essais d’environnement –
Partie 2-70:
Essais – Essai Xb: Effacement des marquages et
inscriptions par friction des doigts et des mains

Environmental testing –
Part 2-70:
Tests – Test Xb: Abrasion of markings and
letterings caused by rubbing of fingers and hands

CODE PRIX
K
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

- 3 -
68-2-70 © IEC:1995
CONTENTS
Page
FOREWORD 5
INTRODUCTION 5
Clause
1 Scope 9
2 Normative reference 9
3 General description
4 Description of the test apparatus 9
4.1 Test apparatus 9
4.2 Test fabric 11
4.3 Test liquids
5 Severity 13
6 Preconditioning
7 Initial measurements
8 Testing
9 Intermediate measurements
10 Recovery
11 Final measurements 15
12 Information to be given in the relevant specification
Annex A - Schematic drawing of a test apparatus for test Xb

68-2-70 © IEC:1995 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
–––––––––
ENVIRONMENTAL TESTING –
Part 2: Tests – Test Xb: Abrasion of markings and letterings
caused by rubbing of fingers and hands
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international cooperation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 68-2-70 has been prepared by IEC technical committee 50:
Environmental testing.
The text of this standard is based on the following documents:
DIS Report on voting
50/359/DIS 50/372/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
Annex A is for information only.
It has the satus of a basic safety publication in accordance with IEC Guide 104.

68-2-70 © IEC:1995 – 7 –
INTRODUCTION
This standard describes a method of test applicable to markings and lettering on such
parts of electrical products (switches, plugs, handles etc.) which in service are subjected
to rubbing forces caused by the fingers or other parts of the hand. This standard may be
applied to other industrial products.
This test should be required by the relevant specification when the stress during normal
use is very high or in such cases where the legibility is important because of safety
aspects or other reasons.
68-2-70 © IEC:1995 - 9 -
ENVIRONMENTAL TESTING —
Part 2: Tests —
Test Xb: Abrasion of markings and letterings
caused by rubbing of fingers and hands
1 Scope
This International standard provides a standard method to determine the resistance
rfaces against abrasion as may occur for
of markings and letterings on flat or curved su
example by manually operating actuators and keyboards. The method is also suitable to
test the resistance against fluid contamination as may occur under normal use.
2 Normative reference
The following normative document contains provisions which, through reference in this
text, constitute provisions of this part of IEC 68. At the time of publication, the edition
indicated was valid. All normative documents are subject to revision, and parties to agree-
ments based on this part of IEC 68 are encouraged to investigate the possibility of
applying the most recent editions of the normative document indicated below. Members
of IEC and ISO maintain registers of currently valid International Standards.
Environmental testing - Part 1: General and guidance
IEC 68-1: 1988,
Amendment 1 (1992)
3 General description
ace under test shall be repeatedly stressed by the rubbing movement of a test
The su rf
piston. The tip of the test piston due to its elasticity is deformed in such a way as to fit the
su rface under test. The material, hardness and shape of the piston, the movem
...