ISO/TR 6356:1982
(Main)Textile floor coverings — Assessment of static electrical propensity — "Walking" test
Textile floor coverings — Assessment of static electrical propensity — "Walking" test
Revêtements de sol textiles — Évaluation de la propension à l'accumulation de charges électrostatiques — Essai du "marcheur"
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TECHNICAL REPORT ISO/TR 63564982 (E)
Published 1982-10-01
INTERNATIONAL ORGANIZATION FOR STANDARDlZATlON.ME)K,QYHAPOflHAR OPrAHM3ALUlR I-IO CTAHAAPTM3AWWl.ORGANlSATlON INTERNATIONALE DE NORMALISATION
Assessment of static electrical
Textile floor covering-s -
“Walking” test
propensity -
This Technical Report, after having been prepared by a Working Group under ISO/TC 38/SC 12, Tetiile floor coverings, was
approved by the sub-committee in a postal ballot in July 1979, thirteen P-members voting in favour and two against. The comments
received were reviewed at the seventh meeting of ISO/TC 38/SC 12 in October 1980, where it was agreed that the amended text
should be submitted to ISO/TC 38 for a postal ballot. This was carried out in March 1981, where twelve P-members of ISO/TC 38
voted in favour and one against.
The subject of static electrical propensity has been studied for a number of years in a Working Group of ISO/TC 38/SC 12 and,
although the “Walking” test method has been refined during this period, the fourth draft proposal did not receive sufficient support
for further processing as a draft International Standard. Nevertheless, many members of the Working Group felt that the method was
of such importance and already so widely used that some form of official international publication was essential, whatever its short-
comings.
Contents
Page
2
0 Introduction . .
.............
.................................................................................
2
1 Scope and field of application
2
2 References. .
2
3 Principle .
3
4 Apparatus .
........................................................................
3
5 Atmosphere for conditioning and testing
...........................................................................
3
6 Sampling and selection of specimens
..............................................................
4
7 Conditioning of specimens, rubber mat and sandals.
4
8 Selectionofoperatives .
4
9 Testprocedure .
...........................................................................
5
10 Calculation and expression of results
5
11 Testreport .
Annexes
6
A Specificationofthesandals .
10
B Standardsolematerials .
.....................................................
12
C Method for measuring the electrical resistance of the footwear
..................................................................
13
D Example of a suitable hand electrode and its use
6
Table Materials for the sandals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures
8
..............................................................................................
1 Insolepattern.
.........................................................................
9
2 Positioning of blind rivets and steel plate
.......................................................
12
3 Circuit for measuring the electrical resistance of the footwear
.................................................................................
13
4 Representation of total system.
14
5 Handelectrodeandvoltagedivider.~
......................
14
6 Handelectrode.~ .
A
Ref. No. : ISO/TR 63564982 (E)
UDC 645.12 : 620.1 : 537.2
Descriptors : textile, floor covering, tests, testing conditions, sampling.
0 International Organization for Standardization, 1982 0
Price based on 14 pages
Printed in Switzerland
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ISO/TR 6356-1982 E)
0 introduction
The present method of test for assessing the static electrical propensity of textile floor coverings has been prepared following exten-
sive development work and laboratory trials. There are several reasons why a full International Standard was not produced, and these
include the following :
-
between laboratories, within laboratories and between operatives where shown to be high in a
the variations in test results
number of inter-laboratory trials; the reasons for such variations were not fully understood and were still being studied;
Yet
-
the sensitivity of the method to changes in atm osp heric conditions is very high, and the maintenance of these conditions
within the prescribed limits is not easily achieved;
-
experience of the method using two of the three sole materials is very restricted, and more information on the relationship of
all three materials is required;
-
‘native or additional mode of walking, and a different manner of recording the results, have
new proposals concerning an al ter
alongside the existing method; details of these proposals are given below :
been put foward and need evaluati
w
Scuffing walk
Instead of the procedure described in 9.2 which requires that the sandals be lifted to between 50 and 80 mm above the
” Walk on the specimen, at the rate of 2 steps per second, rubbing the sandals
specimen, the following method is proposed :
on the specimen without lifting the feet, so that the sandals are always in contact with the specimen; when the walker has
reached the end of the specimen, he turns in one place and moves over the specimen in the opposite direction. Come no closer
than 50 cm to walls of the conditioning room and to other objects in it. Cover as much of the specimen as possible. When the
peak voltage ceases to rise, continue walking for at least 30 s.” The proponents of this method claim better reproducibility and
higher voltages giving more discrimination, its critics comment on the lack of supporting background evidence, whilst several
Working Group members see an advantage in including both walking methods in the test procedure.
Expression of results
Instead of the existing clause 10, the following procedure is proposed : ” Determine from the recorder diagram the linear mean
of the five highest peaks and valleys and express the result in kilovolts.” The supporters of this alteration point out that the
method is independent of the response time of the recording instrument; its critics claim that it is less reproducible and more
dependent on the manner of walking.
two variations are put fomard for information in the hope that they will be studied in conju nction with the basic test method
These
with a view to further consideration at a later date.
1 Scope and field of application
Technical Report describes a “Walki ng” test method for the determination of the electrostatic propensity of floor cover-
This
ings of all types.
2 References
IS0 40, Vulcanized rubbers - Determination of hardness (Hardness between 30 and 85 IRHD).
ISO/R 275, 2C1c oxide for paints.
Sampling and cutting specimens for physical tests.
IS0 1957, Machine-made textile floor coverings -
IS0 2781, Rubber, vulcanized - Determination of density.
IS0 3844, Shoe sizes - Method of marking.
3 Principle
The body voltage generated when a person wearing standardized footwear walks on the textile floor covering under controlled at-
mospheric conditions is measured.
2
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lSO/TR 6356-1982 E)
4 Apparatus
4.1 Grounded metal base plate, measuring at least 200 cm x 100 cm.
NOTE - The use of an earthed metal plate on the floor of the test room or, alternatively, a floor which is entirely of metal may constitute a hazard
where mains voltages are present. It is recommended that mains voltage sources in the test room be protected by the use of suitable earth leakage cir-
cuit breakers.
4.2 Rubber mat, of dimensions 220 cm x 120 cm, thickness 4,5 + 0,5 mm and vertical resistance > 1012 Q, in relation to a sur-
face area of 1 cm?
NOTE - Determination of resistance value is not-in practice carried out over an area of 1 cm?
4.3 Sandals, made in accordance with the requirements in annex A, and reserved specifically for this test method. At least two
sole materials shall be used, conductive “BAM” rubber and either polyvinylchloride (PVC) or XS-664P Neolite, in accordance with the
requirements in annex B. The resistance between the metal plate and an operative standing on it wearing the sandals with conductive
rubber soles shall be < 109 Q, determined in accordance with the method in annex C; with the Neolite soles it shall be approximately
1,5 x 10’0 a.
4.4 Means of cleaning the footwear :
Fine sandpaper.
4.4.1
4.4.2 Scoured cotton cloth, free from finish or detergent.
Ionizing source.
4.5
NOTE - Care should be taken if the ionizing source is of the polonium-210 type, which is toxic although not emitting harmful radiation.
4.6 Body voltage measuring system, consisting of a d.c. static voltmeter, an autographic recorder and a hand electrode,
meeting the following requirements :
a) input resistance of voltmeter and hand electrode system : a 1014 Q
input capacitance of hand electrode : < 20 pF
b)
c) response time of whole system (electrode/voltmeter/recorder) such that the full-scale deflection on the recorder is reached
within 0,25 s.
prevents true maximum voltage being observed; under-damping .
NOTE - Over-damping cause overshooting The system should be checked
may
and low voltage sources applied at step frequency.
periodically against high
An example of a suitable hand electrode system is given in annex D.
4.7 Wet-and-dry bulb ventilated hygrometer, capable of determining relative humidity to an accuracy of 1 %.
5 Atmosphere for conditioning and testing
The specimens shall be conditioned and the test conducted in an atmosphere of 23 k 1 OC and 25 y0 k 2 y0 relative humidity.
NOTE - It is important to maintain
the atmosphere of the test room within the stated limits of temperature and humidity, as under controlled condi-
tions in the region of 23 OC and 25 % r.h., variations in humidity of up to 2 % can produce changes in body voltage of
up to 20 % .
6 Sampling and selection of specimens
Carry out sampling and selection of specimens in accordance with IS0 1957. From each sample, select at least one specimen,
measuring 200 cm x 100 cm.
NOTES
1 In addition to the specimen, it is desirable to have standard specimens of known electrostatic propensity (if possible, one high charging and one
low charging) in order to check the equipment and performance at regular intervals.
2 Generally, the test is carried out on the textile floor covering as received, i.e. with finishes and special treatments as appropriate. However, if it is
required to investigate the permanency of such finishes and treatments, then it may be necessary to submit the specimen to a cleaning process or to
practical wear conditions before testing. If so, these pre-treatments should be recorded in the test report.
3
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ISO/TR 6356-1982 E)
7 Conditioning of specimens, rubber mat and sandals
atmosphere specified in clause 5 for at least 4 hangi freely on a sample
Condition the specimens from the wet side in the days,
w
rack.
finishes are used,
NOTE - Care should be taken to ensu re that specimens are adequately conditioned, particularly in cases where certain special
which can lead to slow conditioning.
, and the rubber mat (4.2) shoul d remain in the testing atmosphere
The sandals (4.31, which sh ould not be used for any other purpose
should nevertheless be conditioned in that atmosphere for at least 2 days.
all the time if possible, but
8 Selection of operatives
The test should be conducted by one representative operative of either sex. Select this operatve and a replacement initially from a
greater population consisting of 10 or more persons, by means of the “Walking” test. The two who produce body voltages nearest to
the average body voltage from that population shall be considered as the representative operatives.
9 Test procedure
9.1 Preparatory
9.1.1 Cleaning of the footwear
9.1.1.1 Before each test series, and if testing is interrupted for a relatively long period of time, clean the soles, of all types, with fine
sandpaper (4.4.11, and rub with a dry piece of scoured cotton cloth (4.4.2).
NOTE - A test series is defined as three (or more) tests on the same specimen with the same sole material.
note ensuring that
9.1. Before each separate test, clean the soles in the manner most appropriate to the sole material (see the 1 I
1.2
the soles are dry before testing.
I
NOTE The following are the methods recommended by the respective sole material suppliers :
-
conductive “BAM” rubber : scoured cotton cloth, moistened with distilled or de-ionized water free from residual detergent;
-
PVC : scoured cotton cloth, moistened with distil
...
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