Standard provided by BIS via BSB Edge Private Limited to NATIONAL ASBESTOS CORPORAT

KOLKATA(asbestosnational@gmail.com) 49.43.26.190.
IS : 4688 • 1968
( Reaffirmed 1999 )
Indian Standard (Reaffirmed!2014)!

SPECIFICATION FOR (Reaffirmed 2019)

PROOFED COTTON DUCK GLAND PACKING

( Second Reprint NOVEMBER 1989)

UDC 621-762.64

@ Copyright 1968

BUREAU OF lNDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NE\V DELHI 110002

Gr2 October 1968

Standard provided by BIS via BSB Edge Private Limited to NATIONAL ASBESTOS CORPORAT
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IS :4688 - 1968

Indian Standard
SPECIFICATION FOR
PROOFED COTTON DUCK GLAND PACKING

Packings and Gaskets Sectional Committee, EDC 58

Chairman Represellting
DB C. B. R.t.M.t.ERISHNAN· Hindustan Ferodo Ltd, Bombay
Memberl
ASSISTANT DIRBOTOR ( DM) Reaearch Designs and Standards Organization
(Mihistry of Railways)
ASSISTANT DIBBOTOB ( DV-2 ) ( Alternate)
SRBI B. K. BAlt8RI Indian Oil Corporation Limited, Bombay
S HBI G. N. GIDW AN I Direotorate General of Supplies & Disposals, New
Delhi
SHBI R. C. SRABIU ( Alterlfate )
BHRI S. K. KAlLA The D. C. M. Chemioal Works, New Delhi
SRBI K. MANI Viotor Gaskets India Ltd, Bombay
DB N. S. NANDBBSWABAIY.t. College of . Military Engineering (Ministry of
Defenco )
BHBI F. J. PALI.t. Asbestos Packings " Manufacturing Co, Bombay
SHBI S. G. PHA!Ul[ Indian Pump Manufacturers Assooiation,
Caloutta
SRBI D. R. PB.t.DHAN The Premier Automobiles Ltd, Bombay
BaBI R.u KUMAB BeWs Asbestos and Engineering ( India) Private
Ltd, Caloutta
SPlU C. p. S. RAO National Orgllonio Chemioal Industries Ltd,
Thana •
SHBI M. V. RAO The Ta.ta Hydro-Electrio· Power Supply Co Ltd,
Bombay
SIIBI S. V. S.t.STBY KirlOllkar Oil Engines Ltd, Poona
SHBIW. N. TALWAR Payeil·Talbros Private Ltd, Faridabad
SRBI S. C. CHOPB.t. ( A.lternate )
BallI N. THANDAVAN Indian Institute of Chemical Engineere, Caloutta
SHRI C. V. TIltBl[AR Tata Engineering " Locomotive Co Ltd,
J'lIomshedplU'
Smu N. VBNKATABA.KAN Hindu.tan Ferodo Ltd, Bombay
SHBI M. V. P.t.TAlOtAB, Direotor General, lSI (Ex,officlo Member)
Direotor { Meoh Engg)
Secretary
BaBI 8. P. ABBBY
Alai,tant Direotor ( Mach Eng, ), lSI
·Dr C. S.Ramakrishnan lOa, ohairman for the meeting at whioh tme standard
was Sn&lBed.
( Co""n••d oil page I )

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN. 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
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IS : 4688 • 1968
( Continued from page 1 I

Panel for Gland Packings, EDC 58: PI

Convener RepresC'nting
8H:aI8. G. PHATAX Indian Pump Manufacturers ABBociation, Cal('utta
Members
8SnI P. K. MUXHERJI ( Alternate to
Shri S. G. Phatak )
AasJ8TANT DUtECTOB ( DM ) Research Designs and Standards Organization
( Ministry of Railways)
ASSISTANT DIRECTOR (DV.2)
( Alternate)
SU:a1 K. J. PALlA. Asbest08 Packing & Manufacturing Co, Bombay
SsaI F. J. PALlA (Alternate)
SRIH K. D. PRADHAN India Steamship Company Limited, Calcutta
SHIn N. VENXATARAIIAN Hindu8tan Ferodo Ltd, Bombay
Da C. S. RAIIAKIUSHNAN (Allernate )

2
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IS : 4688 • 1968

Indian Standard
SPECIFICATION FOR
PROOFED corrON DUCK GLAND PACKING

O. FOREWORD
0.1 This Indian Standard was adopted by the Indian Standards Insti-
tution on 19 June ] 968, after the draft finalized by the Packings and
Gaskets Sectional Committee had been approved by the Mechanical
Engineering Division Council.
0.2 Gland packings are used to contain fluids, gases and slurries under
extreme pressure and temperatures, abrasives and other difficult condi-
tions. This standard relates to proofed cotton duck gland packing.
The requirements of other types of packing, that js, asbestos gland
packing, jute and hemp or flax packing, are covered in separate
standards.
0.3 For the purpose of deciding whether a particular requirement of this
standard is complied with, the final value, observed or calculated, expr('ss-
ing the result of a test, shall be rounded off in accordance with IS: 2-
] 960*. The number of significant places retained in the rounded off value
should be the same as that of the specified value in this standard.

1. SCOPE
1.1 This standard deals with the requirements and methods of tests for
proofed cotton ducy gland packing used for hydraulic services.

2. MATERIAL
2.1 The packing shall consist of layers of friction cotton fabric with top
and bottom cover of rubber. Natural rubber, synthetic rubber or a
mixture of the two may be used.

3. DIMENSIONS
3.1 The preferred thickness of the packing shall be 2, 3, 4, S, 6, 7, 8, 10,
12, 14, 15, 16, 18, 20, 22, 25,30, 32,35, 38, 40, 42, 45, 48 and 50 milli-
metres. Packing of other dimensions may be supplied subject to an
agreement between the purchaser and the manufacturer.
*Rules for rounding off numerical values (revised).

3
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IS : 4688 • 1968
3.2 The maximum permissible variations in dimensions shall be ±O'S mm
for sizes up to and including 10 mm and ± 1 mm for sizes above
lOmm.

4. CONSTRUCTION
4.1 Slab stock shall be built of layers of frictioned cotton fabric laid on
a bias at 45° and in alternate directions, each ply overlapping the butted
joint of the adjacent ply. There shall be at least one layer of frictioned
fabric for each 2 mm thickness. The top and bottom layers shall be of
natural rubber, synthetic rubber or a mixture of the two.
4.2 The surface of the packing shall be smooth and it shall not ha ve torn
out threads.
4.3 The packing shall be coiled into spirals with the edges of the lamina-
tions forming the inside and outside surfaces and vulcanized. The inside
coil diameter shall not be less than four times nor more than six times
the thickness of the finished packing, the cross-section being square.
4.4 Lubrication - The packing shall be lubricated by mineral oil and
graphited.

5. WORKMANSHIP
5.1 The packing shall show no evidence of poor workmanship.

6. SAMPLING
6.1 Lot - The quantity of coils of packing of the same size and of one
definite quality, delivered to one buyer against one despatch note shall
constitute a lot.
6.2 The conformity of a lot to the requirements of this standard shall be
determined on the basis of the tests carried out on the samples sclcct~d
from the lot.
6.3 Unless otherwise agreed to between the manufacturer and the pur-
chaser, the number of coils to be selected at random from a Jot shall be
in accordance with colI and 2 of Table 1.
6.4 The coils selected according to 6.3 shall be inspected for construc-
tion, workmanship and dimensions. If the number of coils found not
in conformity with the specified requirements, is less than or equal to
the corresponding number given in col 3 of Table I, the lot shall be
declared conforming to the requirements of visual and dimensional
characteristics.
6.5 In case of those lots which have been found satisfactory according
to 6.4, a number of coils equal to the sample size given in col 4 of

4
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IS : 4688 - 1968
Table 1 shall be selected from those coils tested according to 6.4. The
specimens cut from these coils shall be subjected to tests given in 7.2,7.3
and 7.4. The lot shall be declared confOI'ming to the requirements of
this specification if all the coils satisfy the relevant requirements.

TABLE 1 SAMPLE SIZE AND CRITERIA FOR CONFORMITY

( Clauses 6.3,6.4, 6.5 and". 1 )

No. O~ COILS FOR VISUAL AND DIMENSIONAL SAMPLE SIZE ~OR

IN TBJ: LOT CHARACTERISTICS
.A. ____________ OTHER
r- CHARACTERISTICS
Sample Size Permissible No.
of Defectives
(1 ) (2) (3) (4)
Up to 100 8 0 3
101.. 300 13 1 4
301.. 500 20 1 5
501 .. 1000 32 2 6
1001 and above 50 3 7

7. TESTS
7.1 Visual and Dimensional Inspection - Each coil selected in accor-
dance with col 2 of Table 1 shall be inspected for the construction,
workmanship and dimensions. The dimensions shall be measured to an
accuracy of O~l mm with a slide-gauge at three different places in two
perpendicular directions. The mean of the six rr.easurements thus made
shall be within the variation specified at 3.2.
7.2 Flexibility - A suitable length of packing with the cover stock
against a rod of diameter four times the thickness and bent through
1800 shall not crack or separate into layers.
7.3 Cotton Fabric - The fabric used for the packing shall weigh not
less than 918 grams per square metre.
7.4 Friction Compound - There shall be neither ply separation nor
material hardening of the compound when a piece of finished packing
is exposed to saturated steam at a pressure of 25 kgf/cm2 for four hour!>.

8. MARKING
8.1 Each coil of packing shall be marked with the manufacturer's name
or trade-mark and the dimensions of the packing.

5
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IS : 4688 - 1968
8.].1 Packing coils may also be marked with the lSI CertifiCation
Mark.
NOTE - The use of the lSI Certification Mark is governed by the provision. of the
Indian Standards Institution ( Certification Marks) Act and the Rules and Regulations
made thereunder. The lSI Mark on products covered by an Indian Standard
conveys the assurance that they have been produced to comply with the requirements
of that standard under a well-defined system of inspection. testing and quality control
which is devised and supervised by lSI and operated by the producer. 151 marked
products are also co: tinuously checked by lSI for conformity to that standard at a
further safeguard. Details of conditions under which a licence for the use of the lSI
Certification Mark may be granted to manufacturen or processors, may be obtained
from the Indian Standards Institution.

9. PACKAGING
9.1 Packaging shall be as agreed between the manufacturer and the
purchaser.

6
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OF INDIAN STANDARDS 49.43.26.190.

HtJsdqusners:
Manak Shavan, 9 Sahadur Shah Zatar Marg, NEW DELHI 110002
Telephones: 331 Ot 31, 331 13 75 Telegrams: Manaksanstha
( Common to all Offices)
Regional Offices: Telephone
Central: Manak Bhavan, 9 Bahadur Shah Zafar Marg, (331 01 31
NEW DELHI 110002 l331 1375
-Eastern : 1/14 C. I. T. Scheme VII M, V. I, P. Road, 362499
Maniktola, CALCUTTA 700054
Northern : SCO 445-446, Sector 35-C, i 21843
CHANDIGARH 160036 { 3 16 41
41 2442
Southern : C. I. T. Campus, MADRAS 600113 41 25 19
{
41 2916
tWestern : Manakalaya, E9 MIDC, Marol, Andheri ( East), 6329295
BOMBAY 400093
Srsnch Offices:
'pushpak', Nurmohamed Shaikh Marg, Khanpur, ( 263 48
AHMADABAD 380001 1 2 63 49
tPeenya Industrial Area 1st Stage, Bangalore Tumkur Road {38 4955
BANGALORE 560058 l38 49 56
Gangotri Complex, 5th Floor, Bhadbhada Road. T. T. Nagar. 6 67 16
BHOPAL 462003
Plot No. 82/83. lewis Road, BHUBANESHWAR 751002 5 36 27
63/5. Ward No. 29. R.G. Barua8oad. 5th Byelane, 3 31 77
GUWAHATI 781003
5-8-56C L. N. Gupta Marg ( Nampally Station Road ). 23 1083
HYDERABAD 500001
R14 Yudhister Marg, C Scheme, JAIPUR 302005 63471
{ 69832
117/418 B Sarvodaya Nagar, KANPUR 208005 21 6876
{ 21 8292
Patliputra Industrial Estate, PATNA 800013 62305
T.e. No. 14/1421. University P,O" Palayam [621 04
TRIVANDRUM 695035 1.621 17
Inspection Offices ( With Sale Point):
Pushpanjali. First Floor. 205-A West High Court Road, 251 71
Shankar Nagar Square, NAGPUR 440010 ,
Institution of Engineers ( India) Buildiny, 1332 Shivaji Nagar, 624 '35
PUNE '411005
·Sale. Office in Calcutta i. at 5 Chowringhee Approach, P. O. Princep 276800
Straet. Calcutta 700072
tSale. Office in Bombay I. at Novelty Chambers, Grant Road, 89 65 28
Bombay 400007
tSales Office in Bangalore i. at Unity Building, Narasimharaja Square, 22 36 71
Bangalore 560002
Reprography Unit, 8IS, New Delhi, India