PREAMBLE (NOT PART OF THE STANDARD)

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END OF PREAMBLE (NOT PART OF THE STANDARD)

IS 2415 : 2004

Indian Standard
CYCLES—RUBBER TUBES—SPECIFICATION

(Third Revision)

ICS 83.160.01

© BIS 2004
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

November 2004

Price Group 3

iii

Bicycles Sectional Committee, TED 16

FOREWORD

This Indian Standard (Third Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Bicycles Sectional Committee had been approved by the Transport Engineering Division Council.

This Indian Standard was first published in 1963 and subsequently revised in 1969 and 1992. In this revision butyl rubber tubes have been included. The additional tube sizes which are prevalent in use by the consumers at present have also been included. Sampling plan has been amended in line with IS 624 : 2003 ‘Bicycles—Rims—Specification (fourth revision)’.

The composition of the Committee responsible for the formulation of this standard is given in Annex B.

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.

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Indian Standard
CYCLES—RUBBER TUBES—SPECIFICATION

(Third Revision)

1 SCOPE

This standard covers the dimensions and other requirements for cycle rubber tubes intended for use with tyres prescribed in IS 2414.

2 REFERENCES

The following standards contain provisions, which through reference in this text, constitute provisions of the standards. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below:

IS No. Title
532 : 1979 Bicycle tube valves (second revision)
2414 : 1991 Cycle and ricksaw pneumatic tyres (third revision)
3400 Methods of test for vulcanized rubbers:
    (Part 1) : 1987 Tensile stress-strain properties (second revision)
    (Part 4) : 1987 Accelerated ageing (second revision)
  (Part 13) : 1983 Tension set (first revision)
5079 : 1969 Rubber valve tubing for cycle tube valves

3 DEFINITIONS

3.1

Tube Size Designation—The cycle rubber tube shall have marked upon it the nominal size designation, which is the same as the size designations marked on the tyre with which the tube is to be used.

3.2

Flat Length—It is approximately half of the total circumferential length of the tube measured when laid flat in the deflated condition.

3.3

Flat Width—It is approximately half of the sectional periphery of the tube when measured in the flat deflated condition.

3.4

Thickness—It is the gauge of the tube wall when measured at any point.

NOTE—The joints are excluded from these measurements as the gauge is generally higher at the joints.

3.5

Valve—A device to enable inflation and retention of air. (For details see IS 532 and IS 5079).

4 DIMENSIONS

The dimensions of the different sizes of cycle rubber tubes shall be as given in Table 1, when measured as per method described in Annex A.

NOTE—The tube dimensions given in Table 1 are not applicable for butyl rubber due to distinct polymer characteristics.

5 REQUIREMENTS

5.1 Tensile Strength and Elongation at Break

The tensile strength and elongation of a rubber sample when cut from a tube and tested as per IS 3400 (Part 1) employing a dumb-bell test piece as shown in Fig.1, shall be as follows:

5.1.1 For Natural Rubber Tube

Tensile strength 107 kgf (10.5 MPa), Min
Elongation at break 475 percent, Min

5.1.2 For Butyl Rubber Tube

Tensile strength 81.5 kgf (8 MPa), Min
Elongation at break 500 percent, Min

NOTE—Measure the dumb-bell thickness at two places on the narrow portion of the dumb-bell and take the average. The tensile strength may be calculated as described in 10.1 of IS 3400 (Part 1), using actual average thickness of dumb-bell.

5.2 Tension Set

Tension set of the rubber sample, cut from a tube, shall not be more than 20 percent when tested as per Annex B of IS 3400 (Part 13) at 300±10 percent stretch, using a dumb-bell test piece.

5.3 Ageing

Tensile strength and elongation at break of a rubber sample cut from tube shall not vary after ageing by more than:

a) For tensile strength ± 20 percent
b) For elongation at break + 20 percent
– 25

over the values obtained without ageing.

5.3.1

Ageing shall be done in an air oven at 70 ± 1°C for 168 h as per IS 3400 (Part 4) on a dumb-bell test piece as shown in Fig. 1.

1
Table 1 Dimensions of Cycle Rubber Tubes
(Clause 4)
All dimensions in millimetres.
SI No. Nominal Tube Size Designation Flat Length of Double Folded Tube Flat Width ±2.0 Minimum Thickness of Tube
New Marking Old Marking + 15
– 25
i) 40-635 28×1½ 1 015 44 0.8
ii) 47-635 28×1½×1¾ 1 015 47 0.8
iii) 47-622 28×1.75 1 010 48 0.8
iv) 37-622 28×15/8×13/8 1 010 36 0.8
v) 37-622 28×13/8 1 010 36 0.8
vi) 32-622 28×15/8×1 1 010 36 0.8
vii) 32-622 28×15/8×11/8 1 010 36 0.8
viii) 32-630 27×1¼ 1 010 36 0.8
ix) 47/52-559 26×1.75-1.95 930 51 0.8
x) 54/57-559 26×2.0-2.125 950 51 0.8
xi) 72/80-559 26×2.70-3.0 950 51 0.8
xii) 40-584 26×1½/
26×1½×15/8
26×15/8
945 44 0.8
xiii) 37-590 26×13/8 950 42 0.8
xiv) 40-571 26×1¾×1½ 950 51 0.8
xv) 54-571 26×2×1¾ 26×2 940 51 0.8
xvi) 54-584 26×1½×2 940 51 0.8
xvii) 47/54-507 24×1.75-2.125 840 51 0.8
xviii) 40-534 24×1½ 865 44 0.8
xix) 37-540 24×13/8 870 42 0.8
xx) 47/54-406 20×1.75-2.125 665 51 0.8
xxi) 37-451 20×13/8 735 42 0.8
xxii) 47/54-355 18×1.75-2.125 600 51 0.8
xxiii) 37-400 18×13/8 625 42 0.8
xxiv) 47/57-305 16×1.75-2.125 505 51 0.8
xxv) 37-349 16×13/8 585 38 0.8
xxvi) 47-317 16×1¾ 590 44 0.8
xxvii) 47/57-254 14×1.75-2.125 440 51 0.8
xxviii) 44-288 14×13/8 510 44 0.8
xxix) 42-286 14×13/8×15/8 495 44 0.8
xxx) 47/62-203 12½×2 ¼ /
12½×1.75×2 ¼
350 51 0.8
2

5.4 Joint Adhesion Strength

5.4.1

Joint adhesion strength shall be 3.05 kg/cm (3 000 N/m), Min.

5.4.2

The test involves cutting a dumb-bell as shown in Fig. 1 from a tube and tested as per IS 3400 (Part 1). The dumb-bell shall be cut from the tube longitudinally with the joint in the middle. Test two pieces from each joint of the tube.

Calculation

Image

where

F = breaking force in Newton, and
W = initial width in mm.

5.5 Leak Test

Cycle rubber tube when inflated and immersed in water for 1 min. shall not show any sign of leakage. The inflation pressure should be sufficient in increase tube circumference by 20 percent.

5.6 Manufacture and Workmanship

5.6.1

Tube shall consist of any inflatable annular torroidal ring made of an elastic material natural or synthetic rubber or a blend thereof suitably compounded and vulcanized and shall have valve fitted to it to enable inflation and retention of air. A suitable valve confirming to IS 532 shall be provided in each tube.

5.6.2

The tube shall be clean and free from blemishes.

5.6.3

The tube shall retain a uniform cross-section when inflated to increase the circumference by 20 percent.

5.6.4

A tube shall not have more than one joint.

6 SAMPLING

6.1

For the purpose of ascertaining the conformity of cycle tubes in a consignment to this standard, the scale of sampling and the criteria for conformity shall be subject to agreement between the supplier and the purchaser. However, for guidance, a typical sampling procedure is given in 6.2.

6.2 Scale of Sampling

6.2.1 Lot

In any consignment, all the cycle tubes of the same nominal size and manufactured by the same firm under relatively similar conditions of manufacture shall be separated in groups of 5000 tubes or less and each group shall constitute a lot.

6.2.2

Test for the determination of the conformity of the lot to the requirement of this specification shall be carried out for each lot separately. The number of tubes to be selected for this purpose shall be in accordance with col 1 and 2 of Table 2.

6.2.3

Required number of tubes shall be selected at random. In case of lots where the tubes are stacked, the following procedure is recommended for use:

Starting from any tube, count them in any order 1, 2, 3, etc, up to r and so on, where r is the integral part of N/r. Every rth tube thus counted shall be withdrawn to constitute the sample.

Table 2 Scale of Sampling
(Clauses 6.2.2 and 6.3.2)
Lot Size, N Number of Tubes to be Selected Possible Number of Defective Tubes
(1) (2) (3)
    Up to 500 3 0
    501-1 000 5 0
1 001-3 000 7 1
3 001-5 000 10 2

6.3 Non-destructive Test

6.3.1

Each of the tubes selected according to 6.2.2 shall be tested for all the dimensions specified in Table 1 and leak test (see 5.5). Any tube failing to satisfy any of the requirements of dimensions and leak test shall be considered as defective.

6.3.2

If the number of defective tubes found in the sample is not more than the corresponding number of

FIG. 1 DIMENSIONS OF DUMB-BELL TEST PIECE

Fig. 1 Dimensions of Dumb-Bell Test Piece

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permissible defective given in col 3 of Table 2, the lot shall be declared as conforming to the requirements of the dimensions and leak test. Only such lots shall be further examined for the destructive type of characteristics as given in 6.4.

6.4 Destructive Test

6.4.1

From each of the lots of tubes that are found satisfactory according to 6.3, one tube shall be chosen at random and the required number of test pieces shall be taken from the tube in the manner prescribed in 5.2 to 5.5. The test pieces so obtained shall be subjected to the test for tensile strength, elongation, tension set, ageing and joint adhesion strength.

6.4.2

The lot shall be declared as conforming to the requirements of this standard if the test results for the different characteristics are all found satisfactory. In case any of the test results for the tube fails for any of the characteristics, two more tubes shall be taken and tests carried out for that characteristic on specimen obtained from the two tubes, and only on finding all the specimens from the two tubes satisfactory, the lot shall be considered as conforming to the requirements of that characteristics.

7 MARKING

7.1

The cycle rubber tube shall have marked upon it the nominal tube size, designation, indication of source of manufacture, name or trade-mark and country of origin. The butyl rubber tube shall be marked ‘butyl’ by embossing.

In the case of nominal size markings the new size markings shall appear on the tube and the old markings may be provided, if required, in parenthesis, for example 40-635 (28 × 1½).

7.2

The material may also be marked with the Standard Mark.

7.2.1

The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The details of conditions under which the licence for the use of the Standard Mark may be granted to the manufacturers or producers may be obtained from the Bureau of Indian Standards.

ANNEX A
MEASUREMENT OF FLAT LENGTH, WIDTH AND THICKNESS

(Clause 4)

A-1 FLAT LENGTH

Deflate the tube completely and place flat on a table. The tube shall be folded lengthwise with the valve pointing upwards and approximately in the middle of the length. Stretch the tube lengthwise just enough to straighten the tube from waviness and measure the length with the help of a tape, avoiding the valve stem.

A-2 FLAT WIDTH

Place the deflated tube on a table as mentioned in A-1 and measure the flat width by placing a ruler perpendicularly cross the tube length and just depressing the loose folds at the edges. Take measurements at 3 places along the length and average the results.

A-3 THICKNESS

Slit the tube body lengthwise and open out the cut edges to form a flat sheet of rubber. Measure the gauge of the flat sheet at six places around the tube and average the results. Measurements should not be made within 50 mm of a joint.

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ANNEX B
COMMITTEE COMPOSITION

(Foreword)

Bicycles Sectional Committee, TED 16

Organization Representative (s)
Hero Cycles Ltd, Ludhiana Shri S. K. Rai (Chairman)
       Shri Brijmohan Lal (Alternate)
Atlas Cycles (Haryana) Limited, Sonepat Shri Vikram Kapur
       Shri Ashok Kumar (Alternate)
Avery Cycle Industries Ltd (Avon Group), Ludhiana Shri Harcharan Singh
       Shri Ashwani Kumar Bhakhan (Alternate)
Avon Cycles Ltd, Ludhiana Shri Onkar Singh Pahwa
       Shri Rishi Pahwa (Alternate)
Bhogal Sons (Regd), Ludhiana Shri Harinder P. Bhogal
       Shri Naginder Singh Bhogal (Alternate)
Bicycle and Sewing Machines (R & D Centre), Ludhiana General Manager
       Shri Shamsher Singh (Alternate)
Controllerate of Quality Assurance (Vehicles), Ahmednagar Joint Controller (ID-A)
       Deputy Controller (ID-A) (Alternate)
Department of Industrial Policy and Promotion, New Delhi Shri M. M. Ali Khan
       Shri B. C. Nayak (Alternate)
Dewan Rubber Industries Ltd, Meerut Shri Vivek Dewan
       Shri C. K. Saxena (Alternate)
Director of Industries, Punjab, Ludhiana General Manager
       Senior Technical Officer (Alternate)
Directorate General of Supplies and Disposals, New Delhi Shri S. M. Munjal
       Shri W. M. Wanjari (Alternate)
Directorate of Industries, Govt. of Haryana, Chandigarh Shri R. N. Goyal
       Shri Sunil Chopra (Alternate)
Eastman Industries, Ludhiana Shri Jagdeep Singh
Govind Rubber Ltd, Distt Ludhiana Shri Vinod Poddar
       Shri S. P. Sukhrani (Alternate)
Hamilton Industries Pvt Ltd, Ambarnath Shri M. R. Prajapati
       Shri P. R. Ravikumar (Alternate)
Hartex Rubber Ltd, Hyderabad Shri K. Subramanian
       Shri Ravindra Pant (Alternate)
J. K. Cycles, Ludhiana Shri Joginder Kumar
Kular Cycle Industries, Ludhiana Shri Ajit Singh
       Shri Darshan Singh (Alternate)
Metro Tyres Limited, Ludhiana Shri L. K. Mathur
       Shri Sanjeev Sood (Alternate)
Nova Bicycle Industries, Ludhiana Shri Harminder Singh Pahwa
       Shri Rohit Pahwa (Alternate)
Office of the Development Commissioner (SSI), New Delhi Shri R. L. Garg
       Shri M. B. Jaya Kumar (Alternate)
Ralson (India) Limited, Ludhiana Shri Sanjeev Pahwa
       Shri T. R. Kukreja (Alternate)
Sadem Industries, Ludhiana Shri Satish Kumar Dhanda
Seth Industrial Corporation, Ludhiana Shri B. K. Seth
T.I. Cycles of India, Chennai Shri S. Sadish Kumar
       Shri V. Durairaj (Alternate)
United Cycle & Parts Manufacturers Association, Ludhiana The President
       The Secretary (Alternate)
BIS Directorate General Shri K. K. Vashistha, Director & Head (TED)
[Representing Director General (Ex-officio)]

Member Secretary
Shri J. M. Khanna
Joint Director (TED), BIS

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