IS 7016-4: Methods of Test for Coated and Treated Fabrics, Part 4: Rubber - or Plastics-Coated Fabrics - Determination of Resistance to Damage by Flexing

15 Pages·2003·1.4 MB·English

by  Bureau of Indian Standards

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IS 7016-4 (2003): Methods of Test for Coated and Treated
Fabrics, Part 4: Rubber - or Plastics-Coated Fabrics -
Determination of Resistance to Damage by Flexing [PCD 13:
Rubber and Rubber Products]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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IS 7016 (Part 4): 2003
ISO 7854:1995

Indian Standard
METHODS OF TEST FOR COATED AND
TREATED FABRICS
PART 4 RUBBER-OR PLASTICS-COATED FABRICS — DETERMINATION OF
RESISTANCETO DAMAGE BY FLEXING
( Second Revision)
?
ICS 59.080.40

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@BIS 2003
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
April 2003 PriceGroup 5
,.
Rubber and Rubber Products Sectional Committee, PCD 13
NATIONAL FOREWORD
This Indian Standard ( Part 4 ) ( Second Revision ) which is identical with ISO 7854:1995 ‘Rubber- or
plastics-coated fabrics — Determination of resistance to damage by flexing’ issued by the International
Organization for Standardization ( ISO ) was adopted by the Bureau of Indian Standards on the
recommendations of the Rubber and Rubber Products Sectional Committee and approval of the
Petroleum, Coal and Related Products Division Council.
This standard was first published in 1973 and revised in 1987. In the first revision certain changes had
been made in the test procedure, dimension of test pieces and the assessment and expression of
results in order to update the standard and align with ISO 7854 : 1984 ‘Rubber- or plastics-coated
fabrics — Determination of resistance to damage by flexing ( dynamic method )’. The Committee
therefore decided to revise this standard to completely align with ISO 7854:1995.
The text of ISO Standard has been proposed to be approved as suitable for publication as Indian
Standard without deviations. Certain conventions are, however, not identical to those used in Indian
Standards. Attention is particularly drawn to the following:
a) Wherever the words ‘International Standard’ appear referring to this standard, they should be
read as ‘Indian Standard’.
b) Comma ( ,) has been used as a decimal marker while in Indian Standards, the current practice
is to use a point ( .) as the decimal marker.
Inthis adopted standard, reference appears to certain International Standards for which Indian Standards
also exist. The corresponding Indian Standards which are to be substituted in their place are listed
below along with their degree of equivalence for the editions indicated. However, that International
Standard cross-referred in this adopted ISO Standard which has subsequently been revised, position in
respect of latest ISO Standard has been given:
International Standard Corresponding Indian Standard Degree of Equivalence

LSO132:1983 Rubber, vulcanize d — Nil —

Determination of flex cracking ( De
Mattia )
ISO 1420:1987 Rubber-or plastics- IS 7016 ( Part 7 ) :1986 Methods Technically equivalent
coated fabrics — Determination of of test for coated and treated fabrics: with minor variation
resistance to penetration by water Part 7 Determination of resistance to
penetration by water ( first revision)
ISO 2231 :1989 Rubber- or plastics Nil —
coated fabrics — Standard
atmospheres for conditioning and
testing
ISO 2286:1986 Rubber-or plastics- IS 7016 ( Part 1 ) :1982 Methods Technically equivalent
coated fabrics — Determination of of test for coated and treated fabrics: with minor variation
roll characteristics Part 1 Roll characteristics ( first
revision )
In case of ISO 132:1983 and ISO 2231 :1989, the Committee, responsible for the preparation of this
standard, took cognizance of these standards and decided that they are acceptable for use in conjunction
with this standard.
For tropical countries like India, the standard temperature and the relative humidity shall be taken

as 27 * 2°C and 65 * 5 percent respectively.
IS 7016 (Part 4) :2003
ISO 7854:1995
Indian Standard
METHODS OF TEST FOR COATED AND
TREATED FABRICS
PART 4 RUBBER- OR PLASTICS-COATED FABRICS — DETERMINATION OF
RESISTANCETO DAMAGE BY FLEXING
( Second Revision)
1 Scope tween a pair of flat grips, one of which reciprocates,
causing the folded test piece to be bent outwards five
This International Standard describes three methods times per second. This high-speed folding of the test
of assessing the resistance of coated fabrics to dam- piece is continued for either a pre-set number of cy-
age by repeated flexing. cles or until damage to the test piece is apparent.
2 Normative references 3.2 Apparatus
The following standards contain provisions which, 3.2.1 Flex-testing machine, as specified in
through reference in this text, constitute provisions ISO 132, with pairs of flat grips. One of the grips of
of this International Standard. At the time of publi- each pair is capable of a reciprocating motion in a
cation, the editions indicated were valid. All standards vertical plane with a stroke length of (57 ‘}5) mm and
are subject to revision, and parties to agreements a frequency of 5,0 Hz ~ 0,2 Hz.
based on this International Standard are encouraged
to investigate the possibility of applying the most re- Each pair of grips is positioned so that they are
cent editions of the standards indicated below. 70 mm + 1 mm apart when in the open position and
Members of IEC and ISO maintain registers of cur- 13 mm + 0,5 mm apart when in the closed position.
rently valid International Standards.
ISO 132:1983, Rubber, vulcanized — Determination
3.3 Preparation of test pieces
of flex cracking (De Mattia).
Select six test pieces each 37,5 mm + 1 mm wide x
ISO 1420:1987, Rubber- or plastics-coated fabrics —
125 mm long from the usable width of the roll as de-
Determination of resistance to penetration by water.
fined in ISO 2286. Three test pieces shall be selected
with their longer dimension in the longitudinal direc-
ISO 2231:1989, Rubber- or p/astics-coated fabrics —
tion of the roll of coated fabric and three test pieces
Standard atmospheres for conditioning and testing.
with the longer dimension in the transverse direction
of the roll of coated fabric. Test pieces shall be se-
ISO 2286:1986, Rubber- or p/astics-coated fabrics —
lected from positions evenly spaced across the full
Determination of rol/ characteristics.
width and length of the sample.
NOTES
3 Method A — De Mat&ia method
1 Inthe case of woven-fabric substrates, asfar aspossible
no two test pieces should contain the same threads of the
3.1 Principle
fabric in the direction to be tested.
A rectangular strip of coated fabric is folded twice so 2 Together with suitable increases in the width of grips,
that its long edges meet forming a strip measuring the test piece size may be increased so as to permit sub-
125 mm x 12,5 mm. This folded strip is mounted be- sequent hydrostatic-head tests to be conducted.

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IS 7016 (Part 4) :2003
ISO 7854: 1995
3.4 Conditioning and testing atmosphere or breakdown of the coated fabric is to be deter-
mined, stop the apparatus at predetermined intervals
Condition the test pieces in atmosphere A, B or C of to allow examination of the test piece.
ISO 2231:1989, and conduct the test in that atmos-
phere.
3.6 Examination of test pieces
3.5 Procedure
Fold each test piece twice as illustrated in figure 1, Examine the test pieces initially whilst retained in the
with the coating to be tested outermost, along lines grips of the flexing apparatus or, if required, remove
12,5 mm from each of the longer edges and to a the test pieces from the grips for a more detailed in-
width of 12,5 mm. Mount each folded test piece be- spection in accordance with clause 6. Test pieces re-
tween a pair of grips whilst they are in the open pos- moved from the grips shall not be remounted.
ition so that the test piece is slightly taut and so that
Terminate flexing either at the specified number of
the coating on the centre section of the test piece
cycles or at the first inspection at which test pieces
will be subjected to an outward fold. Move the grips
show signs of deterioration or cracking of the type
together by hand and guide each test piece into afold
under investigation. Where relevant, record at each
at approximately the midpoint (see figure 1).
examination the total number of flexes to which the
Set the apparatus in motion and stop it after the test pieces have been subjected and assess the flex-
specified number of cycles or, if the point of failure ing damage in accordance with clause 6.
Fold 1
---------------------------------------------------------------------------------
Fold 2
_________________________________________________________________________________

All folded plies to
remain incontact
Fold 2
Figure 1 — Illustration of folding and configuration of test piece for De Mattia method

2
IS 7016 (Part 4) :2003
ISO 7854:1995
3.7 Test report ISO 2286. Three test pieces shall be selected with
their longer dimension in the longitudinal direction of
The test report shall include the following particulars: the roll of coated fabric and three test pieces with
their longer dimension in the transverse direction of
a) a reference to this method of test, i.e. Method A the roll of coated fabric. Test pieces shall be selected
of ISO 7854:1 995; from positions evenly spaced across the full width and
length of the sample.
b) all details necessary for the identification of the
coated fabric, including any relevant reference NOTE 3 In the case of woven-fabric substrates, as far as
number; possible no two test pieces should contain the same
threads of the fabric in the direction to be tested.
c) the specified number of flexes for which the test
was run and at which the examination was made 4.3.2 Test pieces for subsequent
and/or the number of flexes at final inspection; hydrostatic-head testing
d) the severitv of damage at each inspection, re- When hydrostatic-head tests are to be subsequently
ported in accordance with clause 6; conducted in accordance with method B of
ISO 1420:1987, the test piece size used for flexing
e) details of any deviation from the standard test shall be 105 mm x 65 mm and the test piece for
procedure. hydrostatic-head testing shall be taken from the cen-
tral portion of the flexed test piece.
4 Method B — Schildknecht method 4.4 Condtiioning and testing atmosphere
Condition the test pieces in atmosphere A, B or C of
4.1 Principle
ISO 2231:1989, and conduct the test in that atmos-
phere.
A rectangular strip of coated fabric is mounted around
two opposing cylinders so that the test piece takes a
4.5 Procedure
cylindrical form. One of the cylinders reciprocates
along its axis, causing the coated-fabric cylinder to be
Mount each test piece, with the coating to be evalu-
alternately compressed and relaxed, thus inducing
ated outermost, around two opposing cylinders that
foldk in the test piece. This folding of the coated-fabric
are in the fully open position with the length of the
cylinder is continued for either a pre-set number of

test piece around the circumference of the cylinders.
cycles or until damage to the test piece is apparent.

Secure the test pieces into position on each cylinder
by means of a clip (4.2.2). Ensure that the distance
4.2 Apparatus
between the inside faces of the attachment clips
(4.2.2) k 36 mm + 1 mm. When using enlarged test
4.2.1 Test machine, consisting of a pair or pairs of
pieces 65 mm wide (see 4.3.2), the free length of
metal cylinders suitably mounted so that the axes of
unclamped test piece shall be 44 mm A 1 mm (see
each pair lie along an arc having a radius of not less
figure 2).
than 450 mm. The cylinders are 25,4 mm * 0,1 mm
in external diameter and one cylinder of each pair is Set the apparatus in motion and stop it after the
capable of a reciprocating motion along its axis at a specified number of cycles or, if the point of failure
frequency of 8,3 HZ -+0,4 Hz. The stroke length of or breakdown of the coated fabric is to be deter-
the reciprocating cylinder is 11,7 mm ~ 0,35 mm. mined, stop the apparatus at predetermined intervals
to allow examination of the test piece.
4.2.2 Hose clips or tool clips, 10 mm * 1 mm
wide, to attach the test pieces to the cylinders. 4.6 Examination of test pieces
4.3 Preparation of test pieces Examine the test pieces initially whilst retained in the
clips around the mounting cylinders or, if required,
4.3.1 General remove the test pieces from the clips for a more de-
tailed inspection in accordance with clause 6. Test
Select six test pieces each 105 mm long x 50 mm pieces removed from the clips shall not be re-
wide from the usable width of the roll as defined in mounted.

3
IS 7016 (Part 4) :2003
ISO 7854:1995
Dimensions in millimetres
‘0’’’’”+
T T
7 - ODenDosition A T_’1
--L
Stroke length
11,7 * 0,35 —
Coated-fabric 1
test piece
Hose clip
rotating cylinder
a) Standard 105 mmx 50 mmtest piece b) Enlarged 105 mmx 65 mm test piece
Figure 2 — Mounting the test pieces
Terminate flexing either at the specified number of c) the specified number of flexes for which the test
cycles or at the first inspection at which test pieces was run and at which the examination was made

show signs of deterioration or cracking of the type and/or the number of flexes at final inspection;

under investigation. Where relevant, record at each
examination the total number of flexes to which the d) the severity of damage at each inspection, re-
test pieces have been subjected and assess the flex- ported in accordance with clause 6;
ing damage in accordance with clause 6.
e) details of any deviations from the standard test
NOTE 4 It is possible to remove the test pieces for ex- procedure.
amination from the apparatus whilst still ~etained by the
clips. This permits the test pieces to be re-inserted in the
5 Method C — Crumple/flex method
apparatus and flexing continued if so required, without in-
terfering with the folded configuration of the test pieces
caused by flexing. 5.1 Principle
A rectangular test piece of coated fabric is sewn into
a cylindrical shape. The cylinder of coated fabric is
4.7 Test report mounted between two discs and secured into pos-
ition. One of the discs oscillates on its axis through
The test report shall include the following particulars: approximately 90”. This induces twisting in the
coated-fabric test piece cylinder. At the same time,
a) a reference to this method of test, i.e. Method B the other disc reciprocates along its axis, thus causing
of ISO 7854:1 995; the cylindrical test piece to compress along its length.
This twisting and simultaneous compressing of the
b) all details necessay for the identification of th e cylindrical test piece is continued for either a pre-set
coated fabric, including any relevant reference number of cycles or until damage to the test piece is
number; apparent.
4
IS 7016 (Part 4) :2003
ISO 7854:1995
5.2 Apparatus 5.5 Procedure
The apparatus consists essentially of two opposing Check that the apparatus is functioning at the required
flanged or shouldered discs, with (180 ‘~) mm speed before proceeding with the test.
between the inside faces of the flanges at maximum
disc separation. The unflanged part of each disc is Mount the cylindrical test piece between the discs so
63,5 mm in ,diameter x 15,0 mm face width. The that each end of the test piece butts up to the inside
discs are mounted along the same axis with their face of the shoulder on the disc.
edges 152,4 mm apart at their maximum separation
NOTE 5 This ensures that there is approximately 10 mm
(see figure 3). One disc shall be capable of moving
of slack in the test piece when mounted.
towards the other along their common axis for a dis-
tance of 70,0 mm, thus inducing compression into the
Ensure when mounting the test piece that the oscil-
cylindrical test piece at the rate of 2,53 Hz +
lating disc is set at the mid-point of its oscillato~
0,07 Hz, i.e. (152 + 4) compression strokes per min-
cycle, i.e. at zero torque, and that the sewn seam (see
ute. The second disc shall be capable of turning
5.3) is in line with the mid-point of the oscillating disc
through an angle of 90° + 2°, thus inserting twist into
(i.e. uppermost on a horizontal machine).
the cylindrical test piece at a frequency of
3,33 Hz t 0,17 Hz, i.e. (200 A 10) twist insertions
NOTES
per minute.
6 The alignment of the sewn seam with the mid-point of
Counters record the total number of compression the oscillating disc on a horizontally oriented machine is to
strokes inserted during a test and the frequency at reduce the effect of test piece sag when mounted, which
which the machine is operating. can influence the effectiveness of the test.
7 The speed of the machine may require adjusting during
5.3 Preparation of test pieces
the test to offset the reduced damping effect of the test
piece as the test proceeds. Heavier or thicker-coated fabrics
5.3.1 General
will tend to have agreater damping effect at the start of the
test and may therefore require greater adjustment as the
Select two test pieces each 220 mm long x 190 mm damping effect is reduced during the test due to folding and
wide from the usable width of the roll as defined in heating up of the test piece.
ISO 2286. One test piece shall be selected with its
longer dimension in the longitudinal direction of the Set the apparatus in motion and stop it after the
roll of coated fabric and one test piece with the longer specified number of cycles or, if the point of failure
dimension in the transverse directi o n of the roll of or breakdown of the coated fabric is to be deter-
coated fabric. Each test piece shall b e sewn into a mined, stop the apparatus at predetermined intervals
cylindrical shape 190 mm long x 64 mm inside diam- to allow examination of the test piece.
eter with the coating face to be evaluated outermost,
as illustrated in figure 4.
5.6 Examination of test pieces
5.3.2 Test pieces for subsequent
hydrostatic-head testing Examine the test pieces initially whilst retained in the
apparatus. Move the discs to the closed position and
When subsequent hydrostatic-head tests are to be examine the test pieces for signs of cracking or de-
conducted in accordance with ISO 1420, test pieces terioration.
for hydrostatic-head testing shall be taken from the
crumple/flex test piece in accordance with figure 5. Terminate flexing either at the specified number of
cycles or at the first inspection at which test pieces
5.4 Conditioning and testing atmosphere show signs of deterioration or cracking of the type
under investigation. Where relevant, record at each
Condition the test pieces in atmosphere A, B or C of examination the total number of flexes to which the
ISO 2231:1989, and conduct the test in that atmos- test pieces have been subjected and assess the fiex-
phere. ing damage in accordance with clause 6.