DRAFT UGANDA STANDARD  
  DUS 2229 -1 
First Edition  
2020 -mm-dd 
 
 
 Reference number  
DUS 22 29-1: 2020  
© UNBS 2020   
  
Surgical gauze — Specification — Part 1: Absorbent  
 DUS 2229 -1: 2020  
ii © UNBS 2020  – 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 i ts correct application  
© UNBS  2020   
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 writte n 
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 4 333 2 50/1/2/3  
Fax: +256 41 4 286 123  
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  DUS 2229 -1:2020  
© UNBS 2020  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Requirements  ................................ ................................ ................................ ................................ .........  1 
4.1 General requirements  ................................ ................................ ................................ ...........................  1 
4.2 Specific requirements  ................................ ................................ ................................ ...........................  2 
5 Sterility  ................................ ................................ ................................ ................................ ...................  2 
6 Biocompatibility  ................................ ................................ ................................ ................................ ..... 3 
7 Packaging  ................................ ................................ ................................ ................................ ...............  3 
8 Labelling  ................................ ................................ ................................ ................................ .................  3 
9 Sampling  ................................ ................................ ................................ ................................ ................  3 
Annex  A (normative)  Determination of fibre c ontent  ................................ ................................ .....................  4 
A.1 Regents  ................................ ................................ ................................ ................................ ..................  4 
A.2 Procedure  ................................ ................................ ................................ ................................ .....................  4 
Annex  B (normative)  Determination of thread count  ................................ ................................ .....................  5 
Annex  C (normative)  Determination of weight.  ................................ ................................ ..............................  6 
Annex  D (normative)  Determination of length and width  ................................ ................................ ..............  7 
D.1 Length  ................................ ................................ ................................ ................................ .....................  7 
D.2 Width  ................................ ................................ ................................ ................................ .......................  7 
Annex  E (normative)  Absorbency  ................................ ................................ ................................ ....................  8 
Annex  F (normative)  Determination of dried residue  ................................ ................................ ....................  9 
F.1 Procedure  ................................ ................................ ................................ ................................ ...............  9 
F.2 Calculation  ................................ ................................ ................................ ................................ .............  9 
Annex  G (normative)  Determination of aci dity and alkalinity  ................................ ................................ ..... 10 
G.1 Procedure  ................................ ................................ ................................ ................................ .............  10 
G.2 Observation  ................................ ................................ ................................ ................................ ..........  10 
Annex  H (normative)  Determination of dextrin or starch  ................................ ................................ ............  11 
Annex  J (normative)  Determination of fatty matter  ................................ ................................ .....................  12 
J.1 Procedure  ................................ ................................ ................................ ................................ .............  12 
J.2 Calculation  ................................ ................................ ................................ ................................ ...........  12 
Annex  K (normative)  Sterility test  ................................ ................................ ................................ ..................  13 
K.1 Introduction  ................................ ................................ ................................ ................................ ..........  13 
K.2 Fluid thioglycollate medium  ................................ ................................ ................................ ...............  13 
K.3 Alternative thioglycollate medium  ................................ ................................ ................................ ..... 14 
K.4 Soya -bean casein digest medium  ................................ ................................ ................................ ...... 14 
K.5 Sterility  ................................ ................................ ................................ ................................ .................  14 
K.6 Growth Promotion Test of Aerobes, Anaero bes, and Fungi ................................ ...........................  14 
Bibliography  ................................ ................................ ................................ ................................ ......................  16 
 DUS 2229 -1: 2020  
iv © UNBS 2020  – All rights reserved  
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade , Industry and 
Cooperatives established under C ap 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 Sta ndards, 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 f ield or area and consists of key stakeholders 
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 pub lic for comments. The committee reviews 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 is Technical Committee UNBS /TC 14, Medical devices.  
 DRAFT UGANDA STANDARD  DUS 2229 -1: 2020  
 
© UNBS 2020 – All rights reserved  1 
 Surgical gauze — Specification — Part 1: Absorbent  
1 Scope   
This Draft Uganda standard specifies the requirements, methods of test and sampling  of absorbent gauze.  
2 Normative references   
The following referenced documents referred to in  the text in such a way that some or all of their content 
constitutes requirements of this document. For dated references, only the edition cited applies. For undated 
references, the latest edition of the referenced document (including any amendments) appl ies 
ISO 10993 (all parts), Biological evaluation of medical devices  
ISO 24153, Random sampling and randomisation procedures  
3 Terms and definitions   
For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain 
terminol ogical databases for use in standardization at the following addresses: — ISO Online browsing 
platform: available at http://www.iso.org/obp  
3.1 
absorbent g auze 
open meshed fabric  used  as a protective covering (dressin g) for wounds  
3.2 
wrap  
set of yarn in all woven fabrics, that runs lengthwise and parallel to the selvage and is interwoven with the 
filling.  
3.3 
weft/filling  
yarn running from selvage to selvage at right angles to the  warp in a woven fabric  
3.4 
selvag e (selvedge ) 
narrow edge of woven fabric that runs parallel to the warp made with stronger yarns in a tighter construction 
than the body of the fabric to prevent  raveling  or fraying  
4 Requirements  
4.1 General requirements  
4.1.1  Absorbent gauze shall be plain -woven consisting of cotton or blend  of cotton and rayon. The 
composition of rayon in the blend shall not exceed 53% when tested in accordance with Annex A. It shall be 
free from any weaving, spinning or processing defects and any foreign matter.  DUS 2229 -1: 202 0 
2 © UNBS 2020  – All rights reserved  
 4.1.2  Abso rbent gauze shall be classified by the thread count. When tested in accordance with Annex  B, it 
shall meet the requirements of thread count specified in Table 1. 
4.1.3 Absorbent gauze shall meet the requirements for weight specified under Table1 when te sted in 
accordance with Annex C . 
Table 1 — thread count and weight in g per square meter  
Type  Threads per 2.54 cm Average Count, 
Threads per  
6.45 Sq. cm Weight,1)g per Sq. 
Meter  Warp  Filling  
I 41 to 47  33 to 39  76 to 842) 43.8 to 55.8  
II  30 to 34  26 to 30 57 to 63  32.9 to 41.9  
III 26 to 30  22 to 26  49 to 55  28.4 to 36.2  
IV  22 to 26  18 to 22  41 to  47 24.5 to 31.1  
V  20 to 24  16 to 20  37 to 43  22.5 to 28.8  
VI  18 to 22  14 to 18  33 to 39  19.8 to 25.2  
VII 18 to 22  8 to 14  27 to 35  18.1 to 23.1  
VIII  12 to 16  8 to 12  21 to 27  12.1 to 15.5  
1)For Absorbent gauze that contains puri fied rayon, increase these values by 2.5%.  
2) For Type I rolled gauze, the range is 75 to 85 threads per 6.45 sq. cm.  
 
4.1.4 Absorbent gauze may be supplied in the form of r olls or folds  
4.2 Specific r equirements  
Absorbent gauze shall  also conform to the requirements specified in Table 2 when tested in accordance with 
the test methods prescribed therein .  
Table 2  — Specific requirements of absorbent gauze  
Characteristic  Requ irement  Test method  
Dimension, m  Length  — ≥ 98.0% of that stated on the 
label.  Annex D 
Width — Average of three  measurements  
shall be within 1.6 mm of the width stated 
on the label  
Absorbency  Complete submersion shall take place in 
not more than 30 s econds.  Annex E 
Dried residue , mg, max  50  Annex F 
Dextrin or starch  No red, violet, or blue colour develops  Annex  G 
Acidity and alkali nity To pass test  Annex H 
Fatty matte r ,mg ,max  70 Annex J 
 
5 Sterility  
The sterile absorbent gauze shall be free f rom any micro -organisms tested in accordance with Annex  K DUS 2229 -1: 2020  
© UNBS  2020  – All rights reserved  3 
 6 Biocompatibility  
When tested in accordance with the relevant parts of ISO 10993 , the absorbent gauze shall no t cause any 
harmful effect on the user.  
7 Packaging  
Absorbent gauze shall be packaged i n suitable packaging materials which shall protect the product from 
contamination and damage during transportation, handling and storage.  
8 Labelling  
8.1 Each package shall be legibly and indelibly marked  with the following information:  
a) Name of product as “absorbent gauze”;  
b) name and physical address of manufacturer ; 
c) thread count  or type ; 
d) length and width ; 
e) date of manufacture ,  
f) date of expiry ; 
g) batch/lot number ; and  
h) sterile or non - steril e 
8.2 For the case of bulk package, each package shall be legibly and i ndelibly marked with the following 
information : 
i. Name of product as “absorbent gauze”;  
ii. name and physical address of manufacturer;  
iii. thread count;  
iv. length and width;  
v. date of manufacture  
vi. date of expiry;  
vii. batch/lot number;  
viii. sterile or non - sterile and  
ix. quantity pa ckaged.  
9 Sampling  
Sampling shall be done in accordance with US ISO 24153.  DUS 2229 -1: 202 0 
4 © UNBS 2020  – All rights reserved  
 Annex  A 
(normative)  
 
Determination of fibre content  
A.1 Regents  
A.1.1  Sulfuric acid solution  (59.5% by weight)  — Add sulfuric acid slowly to water until the speci fic 
gravity, determ ined at 20°, is between 1.4902 and 1.4956.  
A.1.2  Ammonium hydroxide  — 6 N 
A.2 Procedure  
A.2.1  Place about 500 mg of absorbent gauze, previously bleached and dried at 110° to constant weight 
and accurately weighed, in a glass -stoppered, 125 -mL flask, add 50 .0 mL of Sulfuric acid solution, and shake 
by mechanical means for 30 minutes.  
A.2.2  Pass the mixture through a tared sintered -glass crucible, using three 10 -mL portions of Sulfuric acid 
solution to rinse the flask and applying suction each time to drain the acid.  
A.2.3  Wash the residue in the crucible with 50 mL of 2 N sulfuric  acid, then wash it with water until the 
filtrate is neutral to litmus. Add 40 mL of 6 N ammonium hydroxide to the crucible, allow the residue to soak for 
10 minutes, then apply su ction to remove the liquid.  
A.2.4  Similarly wash the residue with three 50 -mL portions of water, allowing the residue to soak for 15 
minutes each time. Dry the  residue at 105° to 110° to constant weight.  
A.3 Calculation  
Calculate C, the corrected percent age of cotton, taken by the formula : 
The corrected percentage of cotton C  =
                               (i) 
Where  
J is the weight, in mg, of the residue;  
G is the weight, in mg, of the portion of absorbent gauze taken; and  
1.046 and 1.6 are empirical correction factors.  
Calculate R, the corrected percentage of rayon, taken by the formula:  
R = 
                                                                                                                          (ii) DUS 2229 -1: 2020  
© UNBS  2020  – All rights reserved  5 
 Annex  B 
(normative)  
 
Determination of thread count  
B.1 Condition the absorbent gauze for not less than 4 hours in a standard atmosphere of 65 % ± 2% relative 
humidity at 21 °C ± 1.1° C before determining the weight, thread count, and absorbenc y. 
Note — Remove the Absorbent gauze from its wrappings before placing it in the conditioning atmosphere, and if it is in the 
form of bolts or rolls, cut the quantity necessary for the various tests from the piece, excluding the first two and the last  two 
meters when the total quantity of gauze available so permits.  
B.2 Count the warp and filling threads of absorbent gauze in three separate 76.2 -mm squares, not counting 
threads nearer any edge than one -tenth of the dimension of the fabric and not including the same threads in 
any two counts.  
B.3 For pieces not greater than 76.2 mm in either dimension, count all the threads in three different places 
in that dimension of the piece.  
B.4 For absorbent gauze packaged in rolls, count the number of warp and filli ng threads in areas of 1.27 cm 
square at five poin ts evenly spread along the centre  line of the gauze , no point being within 30.5 cm of either 
end of the gauze.  DUS 2229 -1: 202 0 
6 © UNBS 2020  – All rights reserved  
 Annex  C 
(normative)  
 
Determination of weight . 
C.1 Condition the absorbent gauze for not less than 4 hours in a standard atmosphere of 65% ± 2% relative 
humidity at 21°C ± 1.1°C before determining  (See B.1).  
C.2 Weigh a piece of gauze of stated size  and express the weight in terms of g per m2. (See  Table 1 ). DUS 2229 -1: 2020  
© UNBS  2020  – All rights reserved  7 
 Annex  D 
(normative)  
 
Determination of length and width  
D.1 Length  
Unfold or unroll the absorbent gauze, smooth it without stretching it, and measure its length along the centre 
line. 
D.2 Width  
D.2.1  Measure the width at each of the points selected for the thread:  
D.2.2  Record the reading and calculate the average of the  three measurements  (see Table 2)  DUS 2229 -1: 202 0 
8 © UNBS 2020  – All rights reserved  
 Annex  E 
(normative)  
 
Absorbency  
E.1 Condition the  absorbent gauze for not less than 4 hours in a standard atmosphere of 65% ± 2% relative 
humidity at 21°C ± 1.1°C before determining (See B.1 ). 
E.2 Fold about 0.1 m2 into a 10 -cm section. For Absorbent Gauze packaged in rolls, use the entire roll. Hold 
the folded or rolled gauze horizontally almost in contact with the surface of water at approximately 25 ° and 
allow it to drop lightly upon the water: complete submersion shall takes place in not more than 30 seconds . DUS 2229 -1: 2020  
© UNBS  2020  – All rights reserved  9 
 Annex  F 
(normative)  
 
Determination of d ried residue  
F.1 Procedure  
F.1.1 Place 20  g ± 0.1 g in 500 mL of water, and boil the mixture for 15 minutes, adding boiling water as 
necessary to maintain the original volume. Pour the wat er through a funnel i nto a 1000 mL volumetric flask, 
transfer the absorbent gauze to the funnel, press out the excess water with a glass rod, and wash it with two 
250-mL portions of boiling water, pressing the gauze after each washing. Cool the combined washings  ,dilute 
to vol ume, and mix.  
F.1.2 Evaporate 400 mL of the extract, filtering if necessary, in a suitable dish on a steam bath, and dry the 
residue at 105°C  to constant weight : 
F.2 Calculation  
The dried residue , expressed as mg, shall be calculated by  
Dried residue = 80 – 0.6C  
Where  
C  is the corrected percentage of cotton  DUS 2229 -1: 202 0 
10 © UNBS 2020  – All rights reserved  
 Annex  G 
(normative)  
 
Determination of acidity and alkali nity 
G.1 Procedure  
G.1.1  The solution prepared in F.1.1  shall be used.  
G.1.2 To two separate 2 00-mL portions of the extract , add 3 drops of phenolphthalein TS and 1 drop of 
methyl orange TS, respectively .  
G.2 Observation  
G.2.1  Alkalinity  
No pink color develops  
G.2.1 Acidity  
No red color develops in either portion  DUS 2229 -1: 2020  
© UNBS  2020  – All rights reserved  11 
 Annex  H 
(normative)  
 
Determination of d extrin or starch  
H.1 The solution prepared in F.1.1 shall be used.  
H.2 To a 200 -mL portion of the extract add 1 drop of iodine TS: no red, violet, or blue color develops.  DUS 2229 -1: 202 0 
12 © UNBS 2020  – All rights reserved  
 Annex  J 
(normative)  
 
Determination of f atty matter  
J.1 Procedure  
J.1.1  Pack 10 ± 0.01 g in a continuous -extraction thimble with a tared flask, and extract with ether for 5 
hours, adjusting the rate so that the ether siphons not less th an four times per hour. The ether extract in the 
flask shows no trace of blue, green, or brownish color.  
J.1.2  Evaporate the extract to dryness, and dry at 105° C to constant weight.  
J.2 Calculation  
The fatty matter , expressed as mg, shall be calculated by : 
Fatty matter = 0.4C + 30  
Where  
C  is the corrected percentage of cotton  DUS 2229 -1: 2020  
© UNBS  2020  – All rights reserved  13 
 Annex  K 
(normative)  
 
Sterili ty test  
K.1 Introduction  
The following culture media have been found to be suitable for the test for ste rility.  Fluid thioglycollate 
medium is primarily intended for the culture of anaerobic bacteria; however, it will also detect aerobic bacteria. 
Soya -bean casein digest medium is suitable for the culture of both fungi and aerobic bacteria.  
K.2 Fluid thiogl ycollate medium  
L-Cystine                     0.5 g  
Agar                      0.75 g  
Sodium chloride                    2.5 g  
Glucose monohydrate/anhydrous               5.5 g/5.0 g  
Yeast extract (water -soluble)                 5.0 g  
Pancreatic digest of casei n                 15.0 g  
Sodium thioglycollate or                  0.5 g  
Thioglycollic acid                    0.3 ml  
Resazurin sodium solution (1g/L of resazurin sodium), freshly prepared        1.0 ml  
Water R                      1 000 ml  
pH after steriliza tion                  7.1 ± 0.2  
K.2.1 Mix the L -cystine, agar, sodium chloride, glucose, water -soluble yeast extract and pancreatic digest of 
casein with the water R and heat until solution is effected.  
K.2.2 Dissolve the sodium thioglycollate or thioglyc ollic acid in the solution and, if necessary, add 1 M 
sodium hydroxide so that, after sterilization, the solution will have a pH of 7.1 ± 0.2. If filtration is necessary, 
heat the solution again without boiling and filter while hot through moistened filter  paper.  
K.2.3 Add the resazurin sodium solution, mix and place the medium in suitable vessels which provide a ratio 
of  surface to depth of medium such that not more than the upper half of the medium  has undergone a colour 
change indicative of oxygen upta ke at the end of the  incubation period. Sterilize using a validated process. If 
the medium is stored, store at a temperature between 2 °C and 25 °C in a sterile, airtight container.  
K.2.4 If more than the upper one -third of the medium has acquired a pink  colour, the medium may be 
restored once by heating the containers in a water -bath or in free -flowing steam until the pink colour 
disappears and cooling quickly, taking care to prevent the introduction of non -sterile air into the container. Do 
not use the medium for a longer storage period than has been validated. Fluid thioglycollate medium is to be 
incubated at 30°C - 35 °C.  DUS 2229 -1: 202 0 
14 © UNBS 2020  – All rights reserved  
 K.2.5 For products containing a mercurial preservative that cannot be tested by the membrane -filtration 
method, fluid thioglycollat e medium incubated at 20 °C - 25 °C may be used instead of soya -bean casein 
digest medium provided that it has been validated as described in growth promotion test.  
K.3 Alternative thioglycollate medium  
Where prescribed, justified and authorized, the foll owing alternative thioglycollate medium may be used. 
Prepare a mixture having the same composition as that of the fluid thioglycollate medium, but omitting the 
agar and the resazurin sodium solution, sterilize as directed above. The pH after sterilization is 7.1 ± 0.2. Heat 
in a water -bath prior to use and incubate at 30 °C - 35 °C under anaerobic conditions.  
K.4 Soya -bean casein digest medium  
Pancreatic digest of casein                  17.0 g  
Papaic digest of soya -bean meal                3.0 g  
Sodium chlor ide                   5.0 g  
Dipotassium hydrogen phosphate                2.5 g  
Glucose monohydrate/anhydrous               2.5 g/2.3 g  
Water R                      1 000 ml  
pH after sterilization  7.3 ± 0.2  
K.4.1 Dissolve the solids in water R , warming slight ly to effect solution. Cool the solution to room 
temperature. Add 1 M sodium hydroxide , if necessary, so that after sterilization the solution will have a pH of 
7.3 ± 0.2.  
K.4.2 Filter, if necessary, to clarify, distribute into suitable vessels and sterili ze using a validated process. 
Store at a temperature between 2 °C and 25 °C in a sterile well -closed container, unless it is intended for 
immediate use. Do not use the medium for a longer storage period than has been validated. Soya -bean 
casein digest medi um is to be incubated at 20 °C - 25 °C .  
The media used comply with the following tests  given in K.6, carried out before or in parallel with the test on 
the product to be examined.   
K.5 Sterility  
Incubate portions of the media for 14 days. No growth of mic ro-organisms occurs.   
K.6 Growth Promotion Test of Aerobes, Anaerobes, and  Fungi  
K.6.1 Test each lot of ready -prepared medium and each batch of medium prepared either from dehydrate d 
medium or from ingredients. Suitable strains of microor ganisms are indica ted in Table F 1. 
K.6.2 Inoculate portions of Fluid Thioglycollate Medium with a small number (not more than 100 cfu) of the 
following microorganisms, using a separate portion of medium for each of the following species of 
microorganism: Clostridium sporoge nes, Pseudomonas aeruginosa, and Staphylococcus aureus. FInoculate 
portions of alternative thioglycollate medium with a small number (not more than 100 cfu) of Clostridium 
sporogenes.F Inoculate portions of Soybean –Casein  DUS 2229 -1: 2020  
© UNBS  2020  – All rights reserved  15 
 K.6.3 Digest Medium with a small number (not more than 100 cfu) of the following microorganisms, using a 
separate portion of medium for each of the following species of microorganism: Aspergillus brasiliensis, 
Bacillus subtilis, and Candida albicans. Incubate for not more than 3 days in t he case of bacteria and not more 
than 5 days in the case of fungi.  
K.6.4 Seed lot culture maintenance techniques (seed -lot systems) are used so that the viable 
microorganisms used for inoculation are not more than five passages removed from the original m aster seed -
lot. The media are suitable if a clearly visible growth of the microorganisms occurs  
Table K1 —. Strains of the Test Microorganisms Suitable for Use in the Growth Promotion Test  
Test Microorganisms  
Aerobic bacteria  Fungi  Anaerobic bacterium  
Staphylococcus aureus  ATCC 6538, CIP 
4.83,NCTC 10788, NCIMB 9518, NBRC 
13276  
Bacillus subtilis ATCC 6633, CIP 52.62, 
NCIMB 8054, NBRC 3134  
Pseudomonas aeruginosa  ATCC 9027, 
NCIMB 8626, CIP 82.118, NBRC 13275  Candida albicans  ATCC 10231, 
IP 48.72, NCPF 3179,  NBRC 
1594  Clostridium sporogenes  ATCC 
19404, CIP 79.3, NCTC 532 or  
ATCC 11437, NBRC 14293  
 DUS 2229 -1: 202 0 
16 © UNBS 2020  – All rights reserved  
 Bibliography  
[1] USP42 -NF37 - 2043  
[2] USP41 -NF36 - 1927  
[3] USP40 -NF35 - 4382   
 DUS 2229 -1: 2020  
© UNBS 2020 – All rights reserved  17 
 Certification marking  
Products that conform to Uganda standards may be marked wit h 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 
requireme nts of that standard under a system of supervision, control and testing in accordance 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 Director, Uganda 
National Bureau of Standards.  
 
 DUS 2229 -1: 2020    
 
ICS 11.040.30 
Price based on nn pages  
© UNBS 2020 – All rights reserved