DRAFT UGANDA STANDARD  
  DUS 2440  
First Edition  
2021 -mm-dd 
 
 
 Reference number  
DUS 2440 : 2021 
© UNBS 2021  
  
Outdoor  Football s — Specification  
 DUS 2440 : 2021 
ii © UNBS 2021  – All rights reserved  
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necessary provisions of a contract. Users are 
responsible for its correct applic ation  
© UNBS 2021   
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written 
permission from  UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: 256 41 4 505 995  
Fax: 256 41 4 286 123  
E-mail: unbs@infocom.co.ug  
Web: www.unbs.go.ug  DUS 2440 : 2021 
© UNBS 2021  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ .............................  v 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 General  requirements  ................................ ................................ ................................ ...........................  2 
4.2 Materials requirements  ................................ ................................ ................................ ..........................  2 
4.3 The cover  ................................ ................................ ................................ ................................ ................  2 
5 Specific  requirements  ................................ ................................ ................................ ...........................  3 
5.1 Stitching  ................................ ................................ ................................ ................................ .................  3 
5.2 Bladder  ................................ ................................ ................................ ................................ ...................  3 
5.3 Cover ................................ ................................ ................................ ................................ .......................  3 
5.4 Performance requirements  ................................ ................................ ................................ ...................  3 
6 Sampling  ................................ ................................ ................................ ................................ ................  4 
7 Test Conditioning  ................................ ................................ ................................ ................................ .. 5 
8 Packaging  ................................ ................................ ................................ ................................ ...............  5 
9 Labelling/Marking  ................................ ................................ ................................ ................................ .. 5 
Annex  A (normative)  Testing the circumference  ................................ ................................ ...........................  6 
A.1 Principle  ................................ ................................ ................................ ................................ .................  6 
A.2 Apparatus  ................................ ................................ ................................ ................................ ...............  6 
A.3 Procedures  ................................ ................................ ................................ ................................ .............  6 
A.4 Calculations  ................................ ................................ ................................ ................................ ...........  6 
Annex  B (normative)  Testing Sphericity  ................................ ................................ ................................ .........  7 
B.1 Principle  ................................ ................................ ................................ ................................ .................  7 
B.2 Apparatus  ................................ ................................ ................................ ................................ ...............  7 
B.3 Procedure  ................................ ................................ ................................ ................................ ...............  7 
Annex  C (normative)  Testing the ball rebound  ................................ ................................ ..............................  8 
C.1 Principle  ................................ ................................ ................................ ................................ .................  8 
C.2 Apparatus  ................................ ................................ ................................ ................................ ...............  8 
C.3 Procedure  ................................ ................................ ................................ ................................ ...............  8 
C.4 Calculation and expression of results  ................................ ................................ ................................  8 
Annex  D (normative)  Determination of water absorption  ................................ ................................ ...........  10 
D.1 Principl e ................................ ................................ ................................ ................................ ...............  10 
D.2 Apparatus  ................................ ................................ ................................ ................................ .............  10 
D.3 Procedure  ................................ ................................ ................................ ................................ .............  11 
D.4 Calculation  and expression  of results  ................................ ................................ ...............................  11 
Annex  E (normative)  Testing the ball weight ................................ ................................ ................................  12 
E.1 Principle  ................................ ................................ ................................ ................................ ...............  12 
E.2 Apparatus  ................................ ................................ ................................ ................................ .............  12 
E.3 Procedure  ................................ ................................ ................................ ................................ .............  12 
E.4 Calculation  and expression  of results  ................................ ................................ ...............................  12 
Annex  F (normative)  Determination of the loss of pressure  ................................ ................................ ....... 13 
F.1 Principle  ................................ ................................ ................................ ................................ ...............  13 
F.2 Apparatus  ................................ ................................ ................................ ................................ .............  13 
F.3 Procedure  ................................ ................................ ................................ ................................ .............  13 
F.4 Calculation  and expression  of results  ................................ ................................ ...............................  13 DUS 2440 : 2021 
iv © UNBS 2021  – All rights reserved  
 Annex  G (normative)  Deter mination of shape and size retention  ................................ .............................  14 
G.1 Principle  ................................ ................................ ................................ ................................ ...............  14 
G.2 Procedure  ................................ ................................ ................................ ................................ ............  14 
G.3 Calculation  and expression  of results  ................................ ................................ ..............................  15 DUS 2440 : 2021 
© UNBS 2021  – All rights reserved  v 
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade, Industry and 
Cooperatives established under Cap 327, of the Laws of Uganda, as amended.  UNBS is mandated to co -
ordinate the elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT Agreement of the World Trade Organisation (WTO).  
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of key s takeholders 
including government, academia, consumer groups, private sector and other interested parties.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee re views the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
The committee responsible for this document i s Technical Committee UNBS/TC 305 , Leather and leather 
products  
 DRAFT UGANDA STANDARD  DUS 2440 : 2021 
 
© UNBS 2021 – All rights  reserved  1 
 Outdoor  Football s — Specification  
1 Scope  
This draft Uganda S tandard specifies the requirements, sampling and the methods of test for outdoor footballs 
of size 3, size 4 and size 5.  
2 Normative references  
The following referenced documents are indispensable for the application of this document. For dated 
references, only the edition cited applies. For undated references, the latest edition of the referenced 
document ( including any amendments) applies.  
US ISO 2589 , Leather  — Physical and mechanical tests — Determination of thickness  
US ISO 3376 , Leather — Physical and mechanical tests — Determination of tensile strength and percentage 
elongation  
3 Terms and definitions  
For the purposes of this standard, the following terms and definitions shall apply.  
3.1 
panel s 
different segments that make up the outside of the ball  
3.2 
sphericity  
degree to which the shape of a football  approaches a sphere  
3.3 
water absorption  
amount of water absorbed by a material under specified test conditions  
3.4 
bladder  
the chamber inside the inflatable ball filled with air to keep the ball inflated  
3.5 
cover  
the outer surface of footballs  
3.6 
lining  
layers of fabric placed between the cover and the bladder to give the ball strength, structure and bounce  DUS 2440 : 2021 
2 © UNBS 2021 – All rights reserved  
 3.7 
thickness  
small initial dimensio n of the rectangular cross -section in the central part of a test specimen, expressed in 
millimetres(mm)  
3.8 
football  
a spherical -shaped ball used in playing the outdoor sport of football (also known as soccer)  as defined by 
Federation of International Foot ball Association ( FIFA ) 
4 General  requirements  
4.1 The footballs  shall fulfil the following  general  requirements:  
a) be spherical ; 
b) be of the correct size in accordance with the age of the player ; 
c) It shall present a neat, well -finished appearance and shall be free from all defects which might affect 
its functionality ; 
d) It shall be free from biological, chemical and physical contaminants;  
e) be of the right weight ; 
f) be properly inflated with the right amount of air pressure ; 
g) have a safety valve to prevent the loss of  pressure; and  
h) be suitable for all weather conditions  
4.2 Materials requirements  
The materials  used  for making  the footballs  shall comply  with the following  requirements:  
a) be clean;  
b) less water -absorbent  in accordance  with Table  2; 
c) not harmful  to the user; 
d) environmental  friendly  products  to prevent  pollution; and  
e) shock -proof  
4.3 The cover  
The cover  of the footballs  shall comply  with the following  requirements:  
a) be made of leather, polyurethane (PU) or Poly Vinyl Carbonate (PVC), a combination of both synthetic  
materials or other materials which comply with clause 4.2;  
b) be cleanable to remove dirt and grit from the playing surface ; 
c) be non -fading; 
d) be free from visual defects such as  splits, holes, and protruding points when visually examined;  DUS 2440 : 2021  
© UNBS 2021  – All rights reserved  3 
 e) be abrasion resistant ; 
f) be incredibly water -resistant;  
g) the panels should be well sewn together  if not thermally bonded ; 
h) the seams shall be intact; and  
i) have smooth or light embossed or textured surface  
NOTE:  Strong water -resistance ensures that the best possible value from a new  football is obtained. Extra water 
absorption makes the ball heavier to the foot, which increases the chance of injury to the player and prematurely degrades 
the materials of the ball itself.  
5 Specific  requirements  
5.1 Stitching  
The football  panels  when stitched,  shall be stitched  with suitable thread such as polyester, Kevlar, 
nylon  thread  and shall have  24 ± 2 stitches  per decimetre.  The stitches  shall be well stretched.  
When  the ball is inflated  to the air pressure  given  the visible  threads  shall not be more  than 2 mm deep  from 
the surface  of the ball. 
5.2 Bladder  
The bladder  of the footballs  shall comply  with the following  requirements:  
a) be properly  inflated  in accordance  with Table  2; 
b) retain  the inflation  pressure; and  
c) made  from but not limited  to latex , butyl  among others  
d) have a functional valve made from butyl, silicone among others  
5.3 Cover  
The cover  of the  footballs shall  comply  with the requirements given in Table  1 when  tested  in accordance  with 
the methods  specified  therein.  
Table 1 — Physical re quirements of football cover  
S/N Characteristics  Requirement  Test method  
1. Thickness,  mm, min 1.2 US ISO 2589  
2. Tensile  strength,  kg/cm2 , min 200 US ISO 3376  
 
5.4 Performance requirements  
The footballs  shall comply  with the performance  requirements  given in Table  2 when  tested  in accordance  with 
the methods  specified  therein.  DUS 2440 : 2021 
4 © UNBS 2021 – All rights reserved  
 Table  2- Performance  requirements  for footballs  
S/N Characteristics  Size 3 Size 4 Size 5 Test  
method  
1. Age of the player  U7-9 years  U10-12 
years  13 years  and 
above   
2. Circumf erence,  cm 58.5 – 61 63.5-66 68-70 Annex  A 
3. Sphericity,  max 1.8% 1.8% 1.8% Annex  B 
4. Rebound  at 200c, cm 
At 50c, cm, min 110-150 
110 110-160 
110 115-165 
110 Annex  C 
5. Water  absorption , % max 10 10 10 Annex  D 
6. Acceptable  weight,  g 312-340 350-390 410-450 Annex  E 
7. Ball pressure,  bar 0.8 0.8 0.8 Annex  F 
8. Loss  of pressure , max 25% 25% 25% Annex  F 
9.  
Size/shape  retention  with 
change of  pressure  
 
Increase  in circumference  
Deviation  on sphericity  
Change  of pressure   
 
 
 
max.  1.5 cm 
max.  1.8% 
max.  0.1 bar  
 
 
 
max.  1.5 cm 
max.  1.8% 
max.  0.1 bar  
 
 
 
max.  1.5 cm 
max.  1.8% 
max.  0.1 bar Annex  G 
10 Seam/valve  No damage  No damage  No damage  Visual 
inspection  
U = under  
 
6 Sampling  
6.1 In any consignment, all the footballs manufactured under similar condit ions from the same raw 
materials and having the same size shall be grouped together to constitute a lot.  
6.2 Samples of footballs  shall be collected and tested separately for each lot.  
6.3 Number of footballs selected at random from the lot depends upon th e size of the lot and shall be in 
accordance with Table 3.  DUS 2440 : 2021  
© UNBS 2021  – All rights reserved  5 
 Table  3- Sample  size 
S/N  
Lot size Dimension  , mass  and visual  
examination  For Prolonged  Inflation  Test  Loss  
of Pressure, Water  Absorption,  
Rebound  test,  Shape  and Size 
Retention  
Sample  size Acceptance  size 
number  Sample  size Acceptance  size 
number  
i. up to 500 13 1 5 0 
ii. 501 to 1000  20 2 8 0 
iii. 1001  to 3 000 32 3 13 0 
iv. 3001  to 5000  50 5 20 1 
v. 5001  and above  80 7 32 2 
 
6.4 The number of footballs in a sample shall be selected at ra ndom from the lot  
6.5 Each football in the sample shall be inspected for the tests given in Table 2. A ball failing in any one or 
more of these tests shall be considered as defective. The lot shall be considered as conforming to these 
requirements if the n umber of defective balls in the sample does not exceed the number given in Table 3.  
7 Test Conditioning  
The footballs  are inflated  with compressed  air to a defined  pressure  of 0.8 bar ± 0.01.  The air pressure  in the 
football  is measured  with a pressure  gauge; a valve  for the release  of air is situated  between  the pressure  gauge  
and the needle.  The needle  is to be lubricated with  silicone  oil or silicone  lubricant  spray  or glycerin  oil. 
A pressure  gauge  of 1.5 bar with an accuracy  of ± 0.01 bar is to be used  for inflating.  The footballs  are 
conditioned  for at least  24 hours  in a standard  atmosphere  of temperature  20°C  ± 2°C and relative  humidity  
65% ± 5%. 
8 Packaging  
The footballs shall be packed in suitable packages so as to protect them from damage during t ransportation 
and storage.  
9 Labelling /Marking  
Each  football  shall be marked  with the following:  
a) the manufacturer’s name, initials or trade -mark;  
b) ball size (size 3, 4,  or 5); 
c) type of the cover material ; 
d) recommended air pressure ; and  
e) manufacturing date  
 
 DUS 2440 : 2021 
6 © UNBS 2021 – All rights reserved  
 Annex A 
(normative)  
 
Testing the circumference  
A.1 Principle  
The circumference  test indicates  the dimension  of the ball as an average  value  based  on different  axes  of 
measurement.  This test is critical  to ensure  the ball is the correct  size for the game  of football.  It requires  the 
sample  balls to be conditioned  for at least  24 hours.  
A.2 Apparatus  
CM ruler will be used  
A.3 Procedures  
Below  are the procedures  followed  to properly  measure  a football  circumference  
a) inflate the ball to the proper pressure  
b) place the ball in the corner of a 90° angle. Example, place ball on a table top that butts up against a 
90° wall, making sure the ball is touching both the table top and the wall. A large panel of the ball 
should be touching the wall and facing away from the wall  towards you.  
c) then place a square up against a large panel of the ball, which is 180° degrees from the large panel of 
the ball which is touching the wall, as if you are using the square to hold the ball in place, against the 
wall. But do not apply any pres sure against the ball, with the square, only very slight pressure, enough 
to hold the ball in place, without indenting the ball panel.  
d) then mark a spot on the table top, where the front of the square is touching both the ball and table. 
The distance from t he wall to this mark is the diameter of the ball.  
e) now measure that diameter with a CM ruler in ten exactly defined points.  
A.4 Calculations  
The circumference is calculated for all the sample balls an d then the mean circumference. The formula 
applied is  
C = D X π 
Where  
C  is the circumference  
D  is the diameter  
π = 22/7  DUS 2440 : 2021  
© UNBS 2021  – All rights reserved  7 
 Annex  B 
(normative)  
 
Testing Sphericity  
B.1 Principle  
The sphericity  test analyses  how round  the football  is by means  of an average  of several  measurements  of the 
ball’s  diameter.  If the ball is not completely  round,  it cannot  develop  a perfect  flight  path.  This implies  that a 
shot,  even  if and when  exactly  targeted  at the goal,  may miss  the goal 
B.2 Apparatus  
CM ruler 
B.3 Procedure  
B.3.1  The conditioned balls are inflated to a test pressure o f 1.0 bar and the diameter of the ball is 
measured on 16 different spots, with a high degree of accuracy  
B.3.2  The mean diameter is calculated.  
B.3.3  The difference between the highest and lowest diameter is determined as a percentage of the mean 
diameter  DUS 2440 : 2021 
8 © UNBS 2021 – All rights reserved  
 Annex  C 
(normative)  
 
Testing the ball rebound  
C.1 Principle  
A ball is released from 2.00 m and the height it rebounds from the surface is calculated. Laboratory tests are 
also undertaken to assess the effects on this property of compaction of the surface d ue to simulated use of 
the surface.  
C.2 Apparatus  
Measuring device, which comprises of:  
a) an electromagnetic or vacuum release mechanism that allows the ball to fall vertically from 2.00 m ± 
0.01 m (measured from the underside of the ball) without imparting any impulse or spin  
b) vertical scale or laser distance measuring devices to allow the drop height of the ball to be established  
c) timing device, activated acoustically, capable of measuring to an accuracy of 1 ms  
d) footballs used for test  
e) means of measuring wind  speed to an accuracy of 0.1 m/s  
f) a thermometer capable of recording from a minimum range of -10°C to + 60°C accurate to ± 0.5°C to 
record the surface temperature  
C.3 Procedure  
C.3.1  Validate the vertical rebound of the ball on concrete immediately before t esting and adjust accordingly 
until it meets the specified value on concrete  
C.3.2  Check the wind speed  
C.3.3  Release the ball from 2.00 m ± 0.01 m , underside of the ball to the above the top of the infill (in filled 
systems) or on the top of the pile on u nfilled systems of the Football Turf surface and record the time between 
the first and second impact in seconds  
Note: To limit the influence of the valve, it will be preferentially positioned at the top of the ball when the ball is attac hed 
C.4 Calculation  and expression of results  
Calculate the rebound height using the formula:  
𝐻 = 1.23 × ( 𝑇 − ∆𝑡) 2 × 100 
Where  
H = rebound height in cm  DUS 2440 : 2021  
© UNBS 2021  – All rights reserved  9 
 T = the time between the first  and second impact in seconds  
Δt = 0.025s  
Report the value of ball rebound to the near est 0.01m as an absolute value in metres  
 DUS 2440 : 2021 
10 © UNBS 2021 – All rights reserved  
 Annex  D 
(normative)  
 
Determination of water absorption  
D.1 Principle  
The football is  placed in a receptacle  filled with water.  The ball is then compressed  into the water  by means of 
a pneumatic piston  and left to  soak in the water.  The ball  is then weighed  again  after 250  compression  cycles  
and compared  to the original  weight.  
D.2 Apparatus  
The apparatus  contains  a variable  pneumatic  piston,  which  is capable  of compressing  to various  depths.  A 
system  of three  additi onal small  pneumatic  pistons  turns  the football  in various  directions  between  the 
compressions  (one complete  turn in approx.  20 compressions).  Thus,  the complete  football  comes  in contact  
with the water  during  the test. 
  
Figure 1-The apparatus used to measure water absorption  
The machine  must  be capable  of achieving  a compression  of 25% of any tested  football’s  diameter.  
The piston  shall be capable  of a frequency  of at least 40 compressions  per minute.  The receptacle  shall  be 
round and with a diameter  of 30 cm ± 2 cm. It shall be filled with 2 cm ± 0.2 cm of water.  If a pressure  plate  
is used  for achieving  compression,  the diameter  shall be 16 cm ±1 
DUS 2440 : 2021  
© UNBS 2021  – All rights reserved  11 
 D.3 Procedure  
Each of the samples is conditioned and weighed using electronic scal es. The amplitude of compression is 
calculated from the mean diameter obtained from the circumference test. A compression equal to 25% of the 
diameter of the ball is applied at 40 compressions per minute. The compression can be measured by means 
of a compr ession plate  of the distance  between  the plate  and the piston.  After  250 compressions  the ball shall 
be removed  quickly  and wiped  dry on the surface  using  a standard  towel.  Each  ball is then reweighed  again  in 
the same  manner  as above.  Its increase  in weight is expressed  as a percent  of the original  weight  of the 
ball, defining  precisely  the amount  of water  that has been  absorbed.  
D.4 Calculation  and expression  of results  
A value  is indicated  for each  of the  tested  samples  reflecting  the percentage  increase  in weight  after the water  
absorption  test using  the weight  before  the water  absorption  test as benchmark.  The results  are rounded  to one 
decimal.  Each  single  value  must  fall within  the requirements.  DUS 2440 : 2021 
12 © UNBS 2021 – All rights reserved  
 Annex  E 
(normative)  
 
Testing the ball weight  
E.1 Princip le 
In addition  to the standard  ball sample  preparation  and ambient  temperature,  this test should  be done  in a wind  
protected  area to avoid  any external  influence.  
E.2 Apparatus  
Electronic  scales  with an accuracy  of 0.01 g are to be used  for this test. 
E.3 Procedure  
The pre-conditioned  football  is inflated  and weighed  in a standard  atmosphere,  with a wind protected  electronic  
balance.  Once  it has been  ensured  that there  is no wind effect,  record  the weight.  Repeat  the procedure.  
Should  the subsequent  value  vary by more  than ± 0.02g,  discard  the results  and repeat  the test. Five  
measurements  shall be made  per sample.  The same  procedure  is to be followed  for all three  samples  used  
during  this test. 
E.4 Calculation  and expression  of results  
The average  value  from the  5 measurements  is noted  for each  of the  samples  individually.  Then the  individual  
ball average  weights  are used  to calculate  the average  weight  of the ball. 
 DUS 2440 : 2021  
© UNBS 2021  – All rights reserved  13 
 Annex  F 
(normative)  
 
Determination of the loss of pressure  
F.1 Principle  
The football  should  not lose pressure  over time,  thereby  remaining  playable.  This test measures  the difference  
in pressure  over time.  The aim is to ensure  that the ball does not  deflate  too quickly.  The balls are  inflated  to a 
defined  pressure,  then left in a standard  atmosp here after 72 hours  a football’s  air pressure  is measured  and 
the ball should  not lose more  than 25% of its air pressure.  
F.2 Apparatus  
A pressure  gauge  of 1.5  bar with an accuracy  of ± 0.01 bar is to be used  for inflating.  
F.3 Procedure  
F.3.1  Unfold  the football  with both hands  before  inflating  to make  the football  softer.  
F.3.2  Ensure  that the bladder  has been  pushed  into the centre  of the football.  
F.3.3  Apply  a drop of water/oil  into the valve  or needle  before  inflating  the football.  
F.3.4  Insert  the needle only after holding  the bladder  firmly  from the  valve  panel.  
F.3.5  Place  the needle  accurately  in the centre  of the valve.  Inserting  it sideways  can lead to damage.  
F.3.6  The football  should  be inflated  to a lower  pressure  before  it is inflated  to the recommended  pressure.  
F.3.7  The balls are inflated  to a defined  pressure,  then left in a standard  atmosphere  after 72 hours  a 
football’s  air pressure  is measured  and the ball should  not lose more  than 25% of its air pressure . 
F.4 Calculation  and expression  of results  
For each  of the samples,  the loss of pressure  is to be expressed  as a percentage  loss between  the second  
measurement  and the initial  measurement  of pressure.  The value  for each  of the three  samples  shall be 
reported.  DUS 2440 : 2021 
14 © UNBS 2021 – All rights reserved  
 Annex  G 
(normative)  
 
Determ ination of shape and size retention  
This test examines  whether  the form,  the size and the air pressure  remain  stable  during  the play 
G.1 Principle  
The ball is repeatedly  shot by a canon  against  a metal  surface  before  automatically  being  returned  into the 
canon.  The number  of cycles  simulates  use over a period  of time.  The worn  samples  can then be rechecked  for 
size, weight  and shape  in order  to ensure  they do not change  significantly  with use 
 
Figure2 - Construction  of the “Shooti ng device  for footballs”  
The apparatus  used  for this test fulfils  the criteria  below.  
Dimensions  L x W x H [mm]: 2,900  x 940 x 2,280  
G.2 Procedure  
G.2.1  The footballs are conditioned, inflated and placed in the shooting machine.  
G.2.2  Two rotating cylinder s accelerate the balls to a specific velocity, so that they hit a steel panel at a 
consistent speed and angle. Each of the three samples is shot with an exit speed of 50  km/h ±1  against the 
steel plate at an angle of 30°±  2 based on the horizontal line. Th e samples are shot 2000 times at a speed of 
50km/hour.  
G.2.3  Following shooter test , the ball is placed in ambient laboratory conditions (20 ±  2°C and 65 ± 5 % R.H) 
for a minimum of one hour. Afterwards pressure measurement is made at laboratory conditions  (20 ±  2°C and 
65 ± 5 % R.H). The following tests are carried out (in the stated order) with all three ball samples:  
a) pressure  of the samples  after shooting  
b) visual  inspection  of seams  and air valve  
DUS 2440 : 2021  
© UNBS 2021  – All rights reserved  15 
 c) circumference  
d) sphericity  
G.3 Calculation  and expression  of results  
The results  from the tests  performed  after the 2000  cycles  are noted  as follows:  
a) initial  pressure  of the samples  (before  shooting)  minus  pressure  after shooting  gives  pressure  
loss expressed  in bar with 2 decimal  places;  example  0.02 bar. 
b) visual  inspection:  evidence  of any damage  
c) circumference:  results  as per test method  
d) sphericity:  results  as per test method  
The values  of circumference,  sphericity  and pressure  are compared  to the values  from the previous  tests  
according  to test in annex A, B and F respectively . The difference  between  the value  obtained  after the 
shooter  test and prior to it is denoted  as an absolute  increase  for circumference  and pressure  and a 
percentage  for sphericity.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 DUS 2440 : 2021 
16 © UNBS 2021 – All rights reserved  
 Bibliography  
RS 411:2019 , Sport balls  – Specific ation  
FIFA : 2018  Footballs -Test manual  
FIFA : 2006  Testing  and certification  for footballs  
 DUS 2440 : 2021  
© UNBS 2021 – All rights  reserved  17 
 Certification marking  
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure  below.  
The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conjunction with the relevant Uganda Standard. The 
presence of this mark on a product or in relation to a product is an assurance that the goods comply with the 
requirements of that standard under a system of supervision, control and testing in accordan ce with the 
certification mark scheme of the Uganda National Bureau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the D irector, Uganda 
National Bureau of Standards.  
 
 DUS 2440 : 2021    
 
ICS 97.220.40  
Price based on 24 pages  
© UNBS 2021 – All rights reserved