IS 637: Rubber tubings for general purposes

9 Pages·1994·1.2 MB·English

by  Bureau of Indian Standards

इंटरनेट मानक
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to
information for citizens to secure access to information under the control of public authorities,
in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.
“जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ”
Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru
“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 637 (1994): Rubber tubings for general purposes [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””ै”
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”

IS 637 ; 1994

Indian Standard
RUBBERTUBTNGSFORGENERAL
PURPOSES- SPECIFICATION
( Second Revision j
UDC 621-643.3 : 678-4-462

0 BIS 1994
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN. 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
yaM 1994 ecirP poorG 2
.I.._ .----- -..- ..- . . ._ _. _.---- .....- ._._I .____ ^..__ -... . -...-
pm”.-. ^
Rubber Products Sectional Committee, PCD 13
FOREWORD
This Indian Standard ( Second Revision ) was adopted by the Bureau of Indian Standards. after the draft
tinalized by the Rubber Products Sectional Committee had been approved by the Petroleum, Coal and
Related Products Division Council.
This standard was first published in 1955. The first revision of this standard was taken up in 1965 with a
view to adopt the metric system and to align the test methods of tensile strength, elongation at break and
accelerated ageing with those published by ISO. The preparation of test pieces for physical testing from
the slabs of identical rubber mix as the sample as well as the sample itself, where feasible, has been per-
milted. It was also decided not to include the requirements for rubber tubing for hospital use, that come
in intimate contact with such as blood plasma, injectivrs and medicines where chances of contamination
might occur which calls for stricter quality control.
In the preparation of this standard, considerable assistance has been drawn from the following publica-
tions:
IND/TC/2165-1953 ‘Specification for tubing, rubber, red’. Technical Development Establishment
Textiles and Clothing, Kanpur, Ministry of Defence.
BS 1155 : 1954 ‘Vulcanized extruded rubber compounds and tubings’. British Standards Institution.
The present revision has been taken up as a result of review of the standard in the light of experience
gained over the years. In the present version only one type of tubing namely plain rubber tubing has been
cnvered deleting the pressure tubing type. The requirements for pressure tubing has been included in
1S 5680 : 1969 ‘Rubber tubing for medical use ( Amendment No. 1 )‘, which is also under revision.
Sizes up to 50 mm dia for plain rubber tubing has been included. Only one grade of material has been
retained.
This standard contains clause 3.1.2 which permits the purchaser to use his option for selection to suit his
requirements, which calls for agreement between the purchaser and the supplier.
For the purpose of deciding whether a particular requirement of this standard is complied with, the final
value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance
with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )‘. The number of significant places
retained in the rounded off value should be the same as that of the specified value in this standard.
IS 736 : 1994
Indian Standard
RUBBERTUBINGSFORGENERAL
PURPOSES- SPECIFICATION
(S econd Revision )
1 SCOPE Table 1 Dimensions of Plain Rubber
Tubings for General Purposes
This standard prescribes the requirements and
( erualC 3.2.1 )
the methods of sampling and test for plain rubber
tubing for general purposes. llA snoisnemid ni .sertemillim
2 NORMATIVE REFERENCES Sl Internal Tolerance Wall Tole-
NO. Diameter on Internal Thickness rance
The following Indian Standards contain provision Diameter
which through reference in this text, constitute (1) (21 13) 14) (5)
provisions of this standard. At the time of publica- 2’0 i 0’3 - -
i)
tion the edition indicated were valid. All standards ii) 3.0 i_ 0’3 1’5 + 0.2
are subject to revision, and parties to agreements iii) 3’0 i_ 0’3 2’0 f 0.2
based on the standard are encouraged to investi- )vi 5.0 + 0.3 5‘1 rt 0’2
gate the possibility of applying the most recent )v 5’0 & 0’3 0.2 f 0.2
editions of the standards indicated below:
)iv ti.3 5 0’3 0’2 & 0’2
SI .liN Tifle )iiv 6.3 * 0’3 5.2 + 0’2
)iiiv 8Yl f 0.3 0.2 * 0’2
3400 Methods of test for vulcanized )xi 8’0 * 0.3 5.2 & 0.2
( Part 1 ) : 1987 rubbers : Part 1 Tensile stress- ix 0’01 i_ 0’3 5’2 2 0.2
strain properties ( second
)ix 0’01 + 0.3 0’3 & 0’2
revision )
)iix 12.5 105 5.2 & 0’2
3400 Methods of test for vulcanized )iiix 5’21 + 0.5 5.3 rt 0’5
(Part4) : 1987 rubbers : Part 4 Accelerated )vix 0’61 + 0.5 5’2 + 0’2
ageing ( second revision ) )vx 0’61 +- 0.5 5.3 & 0’5
3 REQUIREMENTS )ivx 0’02 k 0.5 03 & 0’2
)iivx . 0’02 * 0’5 0’4 f 0’5
3.1 Materials ,lllVX 0’22 + 0.5 0’3 _t 0.2
)xix O.L2 f 0.5 0.4 & 0.5

3.1.1 The tubing shall be manufactured by extru- )xx 0’52 +_ 0.5 0’4 i_ 0.2
sion from suitable compounded rubber and )ixx 0’52 f 0.5 0’5 + 0’5
properly vulcanized. It shall be uniformly circular )iixx 0.23 + 0.5 0’4 & 0’2
in section within reasonable manufacturing limits
and shall be non-porous, of homogeneous )iiixx 0’23 * 0.5 0.5 & 0.5
)vixx 0’83 f 0’5 0’5 2 0.j
character throughout, and free from grit, pitting
and other visible defects. )vxx 0.83 + 0.5 06 4 0’5
)ivxx 0.54 + 0’5 0.5 zt 0’5
3.1.2 The colour of the tubing shall be subject to )iivxx 0’54 +_ 0’5 0’6 f 0’5
agreement between the purchaser and the )iiivxx 0’05 zt 0.5 0.6 & 0’5
supplier. )xixx 0’05 * 0.5 0.7 & 0.5
3.2 Dimension
3.3 Tensile Strength and Elongation
3.2.1 The internal diameter and wall thickness
The tensile strength and elongation of plain
of plain rubber tubings shall be as specified rubber tubing when tested ( 6.3 ) shall ylpmoc
in Table 1. with the following requirements:
3.2.2 Length Tensile Strength Elongation at Break,
kg/cm=, Min Percent, Min
Unless specified otherwise, the tubing shall be not
less than 10 metres long. 70 300
IS 637 : 1994
3.4 Tension Set 5 SAMPLING
The tension set of the material for plain rubber Representative samples for various tests shall be
tubing when tested ( 6.4 ) shall not exceed the drawn according to the method and scale of
corresponding figures: sampling given in Annex A.
Stretch, Percent Tension Set,
6 TEST METHOD
Percent, Max
200 15 6.1 Test shall be carried out according to the
methods prescribed in this specification. Unless
3.5 Accelerated Ageing Test otherwise agreed to between the purchaser and
the supplier, all tests shall be carried out within
After ageing at 70” f 1°C for 168 hours (6.5), the three months of the date of receipt of the material
tensile strength and elongation of the material by the purchaser.
for plain rubber tubings shall comply with the
following requirements. 6.2 Test Pieces
Percentage change on original tubes after ageing: Wherever possible, the specified test pieces shaii
be cut from the finished article. Where this is
Tensile Strength Elongation at Break
impracticable, the manufacturer shall supply two
- 25 +o sheets of vulcanizates respectively of dimensions
- 30 300 x 300 x 3 mm and 150 x 150 x 6.5 mm
( prepared from the same batch and vulcanized
3.6 Resistance to Ageing Under Tension to the same degree and in the same manner as
the consignment concerned ) from which the
After ageing ( 6.6 ) material shall show no signs
necessary test pieces shall be prepared.
of cracking or other evidence of failure of the
stretched part.
6.3 Tensile Strength and Elongation
3.7 Leakage
Test pieces of the material shall be tested in
The material shall show no leakage when tested accordance with the test method prescribed in
in accordance with 6.7. IS 3400 ( Part 1 ) : 1987.
4 MARKING AND PACKING 6.4 Tension Set
4.1 Packing 6.4.1 Apparatus
The material shall be packed as agreed to Any suitable apparatus capable of subjecting test
pieces to constant elongation may be used. Care
between the purchaser and the supplier.
is needed to ensure that the test piece does not
4.2 Marking slowly creep out of the grips.
4.2.1 Each length of the tu bing shall be plainly, 6.4.2 Temperature
clearly and indelibly marked ad jacent to each end
The test shall be carried out at 27” f 2°C.
with the following:
4 6.4.3 Procedure
Name of the material;
b) Indication of the source of manufacture; Stamp reference marks 50 mm apart on a parallel
sided test pieces 6 mm wide, cut longitudinally
c) Net mass of the material; and buffed smooth on both sides to uniform thick-
4 ness. Fix it in the apparatus and stretch it 200
Internal diameter of the table;
percent for plain rubber tubing for 10 minutes.
)e Lot or batch number; and Allow to recover on a smooth flat surface for 30
f ) Month and year of the manufacture. minutes and then measure the distance between
the reference lines. Note the increase in this
4.2.2 The tube may also be marked with the distance and calculate it as a percentage on the
Standard mark. original length.
4.2.3 The use of the Standard mark is governed 6.5 Accelerated Ageing
by the provisions of Bureau of Indian Standards
Act, 1986 and the Rules and Regulations made Dumb bell test pieces shall be tested after ageing
thereunder. The details of conditions under which at 70” rt 1°C for 168 hours as prescribed in
the licence for the use of Standard Mark may be IS 3400 ( Part 4 ) : 1987 and shall be subjected
granted to manufacturers or producers may be to tensile strength and elongation at break as
obtained from Bureau of Indian Standards. prescribed in IS 3400 ( Part 1 ) : 1987.
IS 637 : 1994
6.6 Resistance to Ageing Under Tension 6.7 Leakage Test
Take a glass rod or tubing or any other suitable
device with smooth surface of diameter greater A 300-cm length of tubing is subjected to internal
than the diameter of the rubber tubing by 20 air pressure of O-5 kg/cm2 for at least 2 minutes
percent for plain rubber tubing Insert 2.5 cm and shall be kept immersed in water for detection
long tubing into it. Subject the assembly to of air ,egakael fi .yna
ageing at 70” f 1°C for seven days as prescribed
in IS 3400 ( Part 4 ) : 1987.
ANNEX A
( Clause 5 )
SCALE OF PLAIN RUBBER TUBING AND CRlTERIA FOR CONFORMITY
A-l SCALE OF SAMPLING A-2 TEST FOR DIMENSIONAL
CHARACTERISTICS
A-l.1 Lot
A-2.1 Each of the tubings selected according
In any consignment, all tubings of the same type to A-l.2 shall be tested for all the dimensions
and grade and manufactured by the same firm and visual characteristics specified under 3.1, 3.2.1
undtr similar conditions of manufacture shall be and 3.2.2. Any tubing failing to satisfy any of the
separated in groups of 5 000 tubings or less and requirements for dimensions and visual charac-
each shall constitute a lot. teristics shall be considered as defective.
A-l.2 Tests for determination of the conformity
A-2.1.1 If the number of defective tubings found
of the lot to the requirements of this specification
in the sample is not more than the corresponding
shall be carried out for each lot separately. The number of permissible defective given in co1 3 of
number of tubings to be selected for carrying out Table 2, the lot shall be declared as conforming
the tests for visual and dimensional characteristics
to the visual and dimensional requirements. Only
shall be in accordance with co1 1 and 2 of
such lots shall be further examined for the des-
Table 2. tructive type of characteristics as given in A-3.
Table 2 Scale of Sampling
A-3 TESTS FOR DESTRUCTIVE TYPE OF
( Clause A-l.2 ) CHARACTERISTICS
Lot Size Number of Permissible Number of A-3.1 The number of tubings to be selected for
Tubings to Number of Tubing to testing all the requirements given under 3.3 to 3.7

be Selected Defe ctive be Selected shall be in accordance with co1 1 and 4 of Table 2.
for Non- Tubing s for These tubings shall be selected from among those
Destructive Destructive
Tests Tests already chosen for the non-destructive tests as in
co1 2 of Table 2 and found satisfactory as
(N! (n)
in A-2.1.1. From each of the selected tubings, one
(1) (2) (3) (4)
test piece shall be taken for testing each of these
pu ot 500 10 0 2
requirements. In case it is not possible to get the
501to 1000 15 1 3 test pieces of required size from the tubing, for
1 001 to 3 000 30 1 4 testing the requirements under 3.3 to 3.5, the
3 001 to 5 000 50 2 5 tests shall be carried out on the prepared sheets
of rubber ( 6.2 ). At least two tests shall be carried
A-l.3 These tubings shall be selected at random out for each of these requirements.
from the lot. In order to ensure the randomness
A-3.1.1 The iot shall be considered as gnivah
of selection, a random number table as agreed to
between the purchaser and the supplier shall be satisfied the requirements for these characteristics
used. In case such a table is not available, the if all the test pieces satisfy the relevant require-
following procedure shall be adopted: ment.
Starting from any tubing in the lot, count them A-4 CRITERIA FOR CONFORMITY
as 1, 2, 3, . . . .__ up to r and so on in one order,
where r is the integral part of J/n. Every rth A lot shall be considered as having satisfied all
tubing thus counted shall be withdrawn to give the requirements of this specification if it is found
the sample for test. satisfactory in A-2.1.1 and A-3.1.1 otherwise not.
3
Bureau of Indian Standards
SIB si a yrotutats noitutitsni dehsilbatse rednu the Bureau of Indian Standards Act, 1986 ot etomorp
suoinomrah tnempoleved of the seitivitca of ,noitazidradnats gnikram dna !tilauq noitacifitrec of goods
dna gnidnetta ot detcennoc srettam ni the .yrtnuoc
Copyright
SIB has the thglrypoc of lla sti .snoitacilbup No part of these snoitacilbup yam eb decudorper ni yna
mrof tuohtiw the roirp noissimrep ni gnitirw of .SIB sihT does ton edulcerp the free ,esu ni the esruoc
of gnitnemelpmi the ,dradnats of yrassecen ,sliated hcus as slobmys dna ,sezis epyt or grade
.snoitangised seiriuqnE gnitaler ot thgirypoc eb addressed ot the rotceriD ( snoitacilbuP ), .SIB
Review of Indian Standards
stnemdnemA are deussi ot sdradnats as the deen sesira no the sisab of .stnemmoc sdradnatS are osla
deweiver ;yllacidoirep a dradnats gnola htiw stnemdnema 1s demriffaer nehw hcus weiver setacidni that
on segnahc are ;dedeen fi the weiver setacidni that segnahc are ,dedeen ti si nekat pu for .noisiver
sresU of naidnI sdradnatS dluohs niatrecsa that yeht are ni noissessop of the tsetal stnemdnema or
noitide
sihT naidnI dradnatS has neeb depoleved morf Dot : No. DCP 13 ( 1311 ).
Ameudments Issued Since Publication
Amend No. Date of eussI txeT detceffA
UAERUB FO NATDNT SDRADNATS

:sretrauqdaeH

kanaM ,navahB 9 rudahaB Shah rafaZ Marg, New ihleD 110002 smargeleT : ahtsnaskanaM
senohpeleT : 331 01 31, 331 13 7.5 ( nommoC ot lla seciffo )
lanoigeR seciffO : enohpeleT
lartneC : kanaM ,navahB 9 rudahaB Shah rafaZ Marg 331 01 31
WEN IHLED 110002 331 13 75
nretsaE : 41/l .C .I .T emehcS IIV M, V. .I .P Road, alotkinaM j 37 84 99, 37 85 61
ATTUCLAC 700054 t 37 86 26, 37 86 62
nrehtroN : 0CS ,644-544 Sector ,C-53 HRAGIDNAHC 160036 ( 53 53 38 23 43, 84 53 16 4u
nrehtuoS : .C .I .T ,supmaC VI Cross Road, SARDAM 600113 i‘ 235 02 16, 235 04 42
( 235 15 19, 235 23 15
nretseW : ,ayalakanaM E9 ,CDIM ,loraM irehdnA ( East ) 632 92 95, 632 78 58
YABMOB 400093 632 78 91, 632 78 92
sehcnarB : .DABADAMHA .EROLAGNAB .LAPOHB .RAWHSENABUHB
.EROTABMIOC .DABADIRAF .DABATZAHG .ITAHAWUG .DABAREDYH
.RUPIAJ .RUPNAK .WONKCUL .ANTAP .Iv’iARUPAHTNANAVURIHT
Printed at New India Priming Press. Khurja. India