UGANDA STANDARD  
  DUS 162 3-1 
First Edition  
2015 -mm-dd 
 
 
 Reference number  
US 162 3-1: 2015  
© UNBS 2015   
  
Hair dyes  — Liquid oxidation hair dyes  — Part 1 , aryl di -amine -based - 
specification  
 DUS  1623-1: 2015  
 Reference number  
US 162 3-1: 2015  
© UNBS 2015   
 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 cont ract. Users are 
responsible for its correct application  
© UNBS 200 7  
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 an d 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: info@unbs.go.ug  
Web: www.unbs.go.ug  Contents  Page 
Foreword  ................................ ................................ ................................ ................................ .............................. 5 
1 Scope  ................................ ................................ ................................ ................................ ...................... 6 
2. Normative references  ................................ ................................ ................................ ................................ .....6 
3.6 HAIR DYE READY FOR USE  ................................ ................................ ................................ ................. 8 
4 PACKAGING AND LABELLING  ................................ ................................ ................................ ............ 8 
4.2 LABELLING  ................................ ................................ ................................ ................................ ............ 9 
5 CAUTIONS/WARNINGS  ................................ ................................ ................................ ......................... 9 
5.2 PATCH TEST  ................................ ................................ ................................ ................................ .......... 9 
6 SAMPLING  ................................ ................................ ................................ ................................ ...........  10 
Annex  A (normative)  DETERMINATION OF pH  ................................ ................................ ............................  11 
A.1 APPARATUS  ................................ ................................ ................................ ................................ ........  11 
A.2 PROCEDURE  ................................ ................................ ................................ ................................ ....... 11 
Annex  B (normative)  DETERMINATION OF ARYL AMINE CON TENT AS THE ACTIVE DYE  ..................  12 
B.1 OUTLINE OF THE METHOD  ................................ ................................ ................................ ...............  12 
B.2 APPARATUS  ................................ ................................ ................................ ................................ ........  12 
B.3 REAGENTS  ................................ ................................ ................................ ................................ ..........  12 
B.4 PROCEDURE  ................................ ................................ ................................ ................................ ....... 12 
B.5 CALCULATION  ................................ ................................ ................................ ................................ .... 13 
Anne x C (normative)  Test for lead using atomic absorption spectrophotometer (AAS)  ........................  14 
Annex  D (normative)  Test for mercury using atomic absorption spectrophotometer (AAS)  .................  15 
D.1 OUTLINE OF THE METHOD  ................................ ................................ ................................ ...............  15 
D.2 REAGENTS  ................................ ................................ ................................ ................................ ..........  15 
D.3 PROCEDURE  ................................ ................................ ................................ ................................ ....... 15 
D.4 CALCULATION  ................................ ................................ ................................ ................................ .... 15 
Annex  E (normative)  Test for Arsenic using Graphite Furnace Atomic Absorption 
Spectrophotometer (GFAAS)  ................................ ................................ ................................ .............  16 
E.1 Scope  ................................ ................................ ................................ ................................ ...................  16 
E.2 Reagents  ................................ ................................ ................................ ................................ ..............  16 
E.3 Stock solution  ................................ ................................ ................................ ................................ ..... 16 
E.4 Calibration  ................................ ................................ ................................ ................................ ...........  16 
E.4   Quality control checks  ................................ ................................ ................................ ............................  16 
E.5 Oxidation state  ................................ ................................ ................................ ................................ .... 17 
E.6 Prereduction  ................................ ................................ ................................ ................................ ........  17 
E.6.1  Potassium Iodide (KI) solution  ................................ ................................ ................................ ..........  17 
E.6.2  L-cysteine solution  ................................ ................................ ................................ .............................  17 
E.6.3  Instrument conditions  ................................ ................................ ................................ ........................  17 
E.6.4  Spectrometric measurements  ................................ ................................ ................................ ...........  17 
E.7 Expression of results  ................................ ................................ ................................ .........................  17 
E.7.1  Method of calculation  ................................ ................................ ................................ .........................  17 
E.7.2  Expression of results  ................................ ................................ ................................ .........................  18 
E.8 Method validation  ................................ ................................ ................................ ...............................  18 
E.8.1  Precision repeatability  ................................ ................................ ................................ .......................  18 
E.8.3  Working range  ................................ ................................ ................................ ................................ ..... 18 
Annex  F (normative)  Determination of hydrogen peroxide content  ................................ ..........................  19 
F.1 REAGENTS  ................................ ................................ ................................ ................................ ..........  19 
F.2 PROCEDURE  ................................ ................................ ................................ ................................ ....... 19 
F.3 CALCULATION  ................................ ................................ ................................ ................................ .... 19 
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Tourism, Trade and 
Industry estab lished under Cap 327 , of the Laws of Uganda.  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 S tandards, and  
(c) the National Enquiry Point on TBT/SPS Agreements 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 representatives of 
consumers, traders, academicians, manufacturers, government and other stakeholders.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general publi c for comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
Committee membership  
 Hair dyes  — Liquid oxidation hair dyes  — Part 1, aryl di -amine  based - 
specification.  
1 Scope  
This Draft Uganda  Standard specifies requirements , sampling and methods of test  for liquid  oxidation hair 
dyes which are aryl di -amine based.  
This standard only covers permanent liquid hair dyes  that are  black, and other colours  based on aryl di -
amines which act as primary intermediates in the dye.  
This standard does not apply to powder hair dyes, plant -based hair dyes, and metallic -based hair dyes 
(temporary).  
  
2. Normative references  
The following referenced documents a re 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.  
EAS 346 , Labelling of cosmetics — General  requirements  
EAS 377 -1, Cosmetics and cosmetic products   Part 1 : List of substances prohibited in  cosmetic product s 
EAS 377 -2, Cosmetics and cosmetic products   Part 2 : List of substances which cosmetic  product s must not 
contain except subject to the res trictions laid down  
EAS 377 -3, Cosmetics and cosmetic products   Part 3: List of colorants allowed in cosmetic products  
EAS 377 -4, Cosmetics and cosmetic products   Part 4: List of preservatives allowed in cosmetic products  
EAS 377 -5, Cosmetics and cosmeti c products  Part 5: Use of UV filters in cosmetic products  
ISO 24153, Random sampling and randomization procedures  
 
3 General  requirements  
3.1 A liquid oxidation hair dye shall consist of two parts supplied in separate containers as follows:  
a) The dyes (ary l diamine) ; 
b) The developer . 
All ingredients used shall comply with all parts of EAS 377 
3.2 The dye shall be dermatologically safe and shall not cause sensitization on the scalp.  
3.3 The dye shall have no undesirable effect on the hair.  
3.4 Dye — The active  ingredient shall be an aryl amine dispersed in a suitable surface active agent in an 
alkaline medium.  It may also contain other suitable modifiers.  The dye shall comply with the requirements 
given in Table 1, when tested according to the methods given i n the annexes .  
 
Table 1 - specific requirements  
SL No.  CHARACTERISTIC  REQUIREMENT  
METHOD OF 
TEST  Type 1  
(Black)  Type 2  
(Other colours)  
 
(i) pH at 25±2oC 9.0 to 11.0  9.0 to 11.0  Annex A 
(ii) Total active matter (dye 
content), per cent m/m  2.5 to 4. 0 1.0 to 2.9  Annex B 
 
 The products shall comply with the limits for heavy metal contaminants in accordance with Table 2.  
 
Table 2 — Limits  for heavy metal contaminants  
SL No.  CHARACTERISTIC  REQUIREMENT  
METHOD OF 
TEST  Type 1  
(Black)  Type 2  
(Other co lours)  
 
(iii) Lead, ppm,  max.  20 20 C 
(iv) Mercury , ppm, max.  2 2  D 
(v) Arsenic , ppm, max.  2 2 E 
NOTE  The total amount of heavy metals as lead, mercury and arsenic, in combination, in the finished 
product should not exceed 20 ppm.  
 
3.5 The package shall include a developer, which will be a dilute solution of hydrogen peroxide, free from 
foreign matter and suitably stabilized.   It shall comply with the requirements given in Table 3 when tested 
according to the methods prescribed in the annexes . 
 
 
TABLE 3. REQUIREMENTS FOR OXIDIZING AGENT (DEVELOPER ) 
SL No.  CHARACTERISTIC  REQUIREMENT  METHOD OF TEST  
(REF. TO ANNEX ) 
(i) pH 3 to 4  A 
(ii) H2O2 assay, per cent  by 
mass, (m/m),   5 to 6.5  F  
3.6 HAIR DYE READY FOR USE  
 
3.6.1 Requirements  —  
The Para pheny lene diamine  (PPD) content  in dye ready for use shall be as given in Table 3.  The 
procedure for calculation is given below the table.   
 
 
TABLE  4. REQUIREMENTS FOR HAIR DYE, READY FOR USE  
 
SL No.  CHARACTERISTIC  REQUIREMENTS  TEST METHOD  
 (Black)   (Othe r colours ) 
(1) (2) (3) (4) (5) 
(i) Aryl amine in the 
solution after 
recommended dilution 
with developer, 
calculated as free 
base, %  1.25 to 2  0.5 to 1.0  The procedure for 
calculation is as given 
in 3.6.2  
 
Note 1: The lower limit of dye is prescribed to  check the effectiveness of the dye while the upper limit is 
prescribed to ensure that the concentration of remains within safe limits.  
 
Note  2: The dye ready for use is prepared by mixing the dye content and the developer in the proportion 
recommended by the manufacturer in the leaflet describing instructions for use  
3.6.2 The procedure for calculation of PPD content in solution after recommended dilution with developer is 
as follows:  
Aryl di -amine content in diluted dye = 
1YX
  
 where,  
X = aryl di -amine content in dye ; 
Y = number of parts of developer mixed with 1 part of dye.  
 
 
4 PACKAGING  AND LABELLING  
4.1 The dye and developer shall each be packed  separately in suitable well -sealed containers that shall 
protect the contents  from deterioration  and shall not cause any contamination or react with the product . The 
two shall be packed together in a suitably labelled pack .  
 4.2 LABELLING  
4,2.1 The containers shall be legibly and indelibly  marked in English or any other language  as agreed 
between the manufacturer and supplier .  
The labelling shall comply with the requirements of EAS 346 . 
In addition each package shall be marked with the following  
a) The title ‘Liquid Oxidation Hair Dye ’; 
b) The minimum percentage PPD content ; 
c) Shade of the dye;  
The INCI label names (previously CTFA names) shall be used.  
NOTE: 3 INCI stands for International Nomenclature Cosmetic Ingredient  
                   CTFA stands for Cosmetic, Toi letry and Fragrance Association  
  
NOTE: 4 This information may be supplied in a s enclosed leaflet if the package is too small.  
In addition to the above, the following information shall also be given in the leaflet.  
a) Procedure for conducting preliminary test for sensitivity (patch test) . 
b) Instructions for use.  
5 CAUTIONS/WARNINGS  
5.1 The following warnings shall be   printed on the label, if  the package is for general use:  
a) for general use  only 
b)  can cause an allergic reaction ; 
c) contains phenylenediamines ; 
d) do not use to dye eyelashes or eyebrows.  
5.1.2 The following warnings shall be print ed on the label, if the package is for professional use:  
a) for professional use only ; 
b) Contains phenylenediamines ; 
c) can cause an allergic reaction ; 
d) wear suitable gloves.  
5.2 PATCH TEST  
Each package shall contain an insert in English, or any other language as a greed between the 
manufacturer and supplier  for carrying out a preliminary test by the intended user to avoid skin 
irritation, as follows:  
'Para -phenylenediamine containing preparations may cause serious inflammation of the skin in some 
cases and so a prel iminary test should always be carried out to determine whether or not special 
sensitivity exists.  For carrying out the test, cleanse a small area of skin behind the ear or upon the 
inner surface of the forearm, using either soap and water or alcohol.  App ly a small quantity of the hair dye as prepared for use to the area and allow it to dry .   After 48 h, wash the area gently with soap 
and water.  If no irritation or inflammation is apparent, it may be assumed that no hypersensitivity to 
the dye exists.  T he test should, however, be carried out before each and every application.  This 
preparation should on no account be used for dyeing eyebrows or eyelashes as severe inflammation 
of the eye or even blindness may result.  
6 SAMPLING  
Random samples of the prod uct shall be drawn for test in accordance with ISO 24153 from the market, factory 
or elsewhere.  
 Annex  A 
(normative)  
 
DETERMINATION OF pH  
A.1 APPARATUS  
Any pH meter, preferably equipped with a glass electrode.  
A.2 PROCEDURE  
A.2.1 For the Dye  — Take about 10 mL to 20 mL (or any appropriate amount) of the dye and determine its 
pH at 23 ± 2 oC using the meter.  
A.2.2 For the Developer  — Similarly, take 10 mL to 20 mL of the oxidizing agent (developer) and 
determine its pH at 23 ± 2  oC using the meter.  
In both cases, use the procedural instructions as given for the type of pH meter used.  Annex  B 
(normative)  
 
DETERMINATION OF ARYL AMINE CONTENT AS THE ACTIVE DYE  
B.1 OUTLINE OF THE METHOD  
This method estimates aryl  amine as diacetyl derivative of aryl amine.  
B.2 APPARATUS  
B2.1 Continuous extraction apparatus as illustrated in Figure B1.  
 
 
All dimensions in millimetres.  
FIG. B1 CONTINUOUS EXTRACTION APPARATUS  
B.2.2 G 4 sintered glass cruc ible. 
B.2.3 Beaker  — 100-mL capacity . 
B.3 REAGENTS  
B.3.1 Chloroform — Laboratory reagent grade . 
B.3.2 Acetic Anhydride  — Analytical reagent grade . 
B.4 PROCEDURE  
Transfer accurately weighed quantity (about 5 g) of liquid hair dye, so as to contain 0.1  g to 0.3 g para -
phenylenediamine, to the inner tube of the continuous extractor, previously charged with chloroform. Take 60 
mL chloroform in the flask and completely extract the dye. About 5 h extraction is sufficient. Remove the flask 
and transfer chloroform extract to 100 -mL beaker, rinsing the flask with few small portions of chloroform.  
Evaporate chloroform to about 25 mL and add 1 mL acetic anhydride slowly, with stirring. Let it stand for one 
hour and filter on a weighed G 4 sintered glass crucible. Wash the beaker and precipitate with three or four 5 -mL portions of chloroform. Carefully, remove last traces of precipitate from the beaker. Dry to constant mass 
at 120 oC and weigh the precipitate of diacetyl para -phenylenediamine  C6H4 (NH 6COCH 3)2. 
B.5 CALCUL ATION  
Aryl amine content (as para -phenylenediamine ) = 
2M100 0.56261M    
where,  
M1=mass,  in g, of the precipitate, and  
M2=mass, in g, of the hair dye taken for extraction.  Annex  C 
(normative)  
 
Test fo r lead using atomic absorption spectrophotometer (AAS)  
C.1 OUTLINE OF THE METHOD  
The sample is passed through wet digestion using pressure decomposition: The amount of lead is 
then determined using AAS.  
C.2 REAGENTS   
The reagents used should be of analytic al-reagent grade: Water must be distilled or de -ionized.  
C.3 PROCEDURE  
C.3.1 Weigh accurately 0.4 g of sample and put this into a 50 -mL decomposition pressure tube.  Add 7.0 mL 
of concentrated nitric acid.  Add 2.0 mL of water.  Close the pressure vessel, and apply between 15  — 
20 Nm of pressure.  Digest for about 2 hours.  Transfer to a 20 -mL volumetric flask and make to the 
mark.  
C.3.2 Prepare the standard solutions for l ead. Aspirate into the flame each of the standard solutions in 
ascending order of co ncentration. Take the absorbance reading for ea ch concentration using the 
AAS.  Plot a calibration graph of the concentration of lead in the standard solutions against the 
corresponding values of absorbencies.  
C.3.3 Aspirate into the f lame the sample soluti on. Take the absorbance reading from the AAS and give it a 
value X. From the graph, use the value of absorbance X to read the corresponding value of 
concentration.  Let this value of concentration be C. 
C.4 CALCUL ATION  
MD x C = lead of Amount
 
where,  
C= concen tration of the sample solution ; 
M= mass of sample in grams ; 
D= dilution factor.  Annex  D 
(normative)  
 
Test for mercury using atomic absorption spectrophotometer (AAS)  
D.1 OUTLINE OF THE METHOD  
The sample is  passed through wet digestion using pressure decomposition.  
The sample is further prepared using vapour generation method.  
The amount of mercury is then determined using AAS.  
D.2 REAGENTS  
The reagents used should be of analytical -reagent grade. water must  be distilled or de -ionized.  
D.3 PROCEDURE  
D.3.1 Weigh accurately 0.4 g of sample and put this into a 50 - mL decomposition pressure tube. Add 7.0 of 
concentrated n itric acid. Add 2.0 mL  of water.  Close the pressure vessel, and apply between 15 -20 nm of 
pressure.  Digest for about 2 h.  Transfer to a 20 -mL volumetric flask and make to the mark.  Further prepare 
the sample using the Vapour generation Method.  
D.3.2 Prepare the standard solutions for mercury. Aspirate into the flame each of  the standard soluti ons in 
ascending order of concentration using the AAS.  
Plot a calibration graph of the concentration of mercury in the standard solutions against the corresponding 
values of absorbencies.  
D.3.3 Aspirate into the flame the sample solution. Take the absorba nce reading from the AAS and give it a 
value X. From the graph, use the value of absorbance  X to read the corresp onding value of concentration. Let 
this value of concentration be C. 
D.4 CALCULATION  
MD x C = mercury of Amount
 
Where,   
C = concentration of the sam ple solution ; 
M = mass of the sample in grams ; 
D = dilution factor.  
 Annex  E 
(normative)  
 
Test for Arsenic using Graphite Furnace Atomic Absorption 
Spectrophotometer (GFAAS)  
E.1 Scope  
This method of test de scribes the determination of Arsenic in cosmetics and related products  
E.2 Reagents  
E.2.1  1.5 % V/V hydrochloric acid  
Carefully add 15 mL conc. HCl to distilled water and make up to 1 L.  
E.2.2  1 % W/V NaOH solution  
Carefully dissolve 10 g sodium hydroxide  flakes in distilled water and make up to 1 L.  
E.2.3  3 % W/V  NaBH 4 solution  
Dissolve 3 g sodium tetrahydroborate in 1 % NaOH solution and make up to 100 mL with 1 % NaOH solution.  
E.3 Stock solution  
Prepare the stock solution containing 1 000 mg/L As usin g commercially available concentrated calibration 
solutions.  
WARNING   Arsenic solutions are toxic.  
E.4 Calibration  
E.4.1 Preparation of calibration curve  
E.4.1.1 Dilute the stock 100 ppb solution with 1.5 % HCl    to obtain solutions with  10 ppb, 20 ppb, 40  ppb, 
60 ppb, 80 ppb and 90 ppb of Arsenic.  
E.4.1.2 Inject 20 microlitres each of the six solutions in turns at the same rate starting from the lowest 
concentrated solution to the highest concentrated solution.  
E.4.1.3 Record the corresponding absorbance v alues and plot calibration curve.  
E.4   Quality control checks  
E.4.1 Duplicates  
 In a set of ten or less number of samples, one sample shall be analysed in duplicate to 
comply as with stated accepted criteria : The absolute difference between two independen t test results 
obtained using the same procedure shall be not greater than 10 % of the arithmetic mean of the two results.  
E.4.2 Spiked blank  
 Spiked sample or distilled water with the concentration 10.0 ppb of lead shall be analysed 
alongside  samples and a recovery of %100 ±5 used as criteria of acceptance of results.  
 E.4.3 Reductant solution  3 % NaBH 4 in 1 % NaOH solution.  
E.5 Oxidation state  
E.5.1 The hydride is generated much more slowly from As (V) than from As (III).  To prevent interferences, 
As (V ) must be prereduced to As (III) prior to the determination.  
E.5.2 Prereduction can be performed with KI in semiconcentrated (5 mol/L) HCl solution or, preferably, with 
L-cysteine.  
E.6 Prereduction  
E.6.1 Potassium Iodide (KI) solution  
Dissolve 3 g KI and 5 g L (+) - ascorbic acid in 100 mL water.  Prepare fresh daily.  Add 1 mL of the KI solution 
per 10 mL of the sample solution in 15% HCl and allow to stand for 30 minutes, or   
E.6.2 L-cysteine solution  
Dissolve 5 g L -cysteine in 100 mL 1.5%  HCl.  This s olution is stable for at least a month.  Add 2 mL of the L -
cysteine solution per 10 mL of the sample solution and allow to stand for 30 minutes.  
E.6.3  Instrument conditions  
The following conditions shall be used for the furnace during analysis of Arsenic:  
E.6.3.1 Wave length   193.7nm  
E.6.3.2 Slit:                  0.7 nm  
E.6.3.3 Atomization site:  pyro/platform  
E.6.3.4 Furnace condition for Arsenic.  
Refer to the instructions of the manufacturer  
E.6.4  Spectrometric measurements  
E.6.4.1 Inject into the furnace  the calibration standards, the blank solution and the test solution.  
E.6.4.2 Record the absorbance reading.  
E.6.4.3 If the absorbance of the sample is greater than the highest calibration standard, dilute the test 
solution appropriately using 1.5% HCl   for Arsenic, then measure the absorbance.  
E.6.4.4 Inject the calibration solutions in ascending order.  
NOTE  The calibration curve shall only be acceptable for analysis when the correlation coefficient ( r2)  0.99 
E.7 Expression of results  
E.7.1 Method of ca lculation  
The arsenic  content of the sample expressed in mg/L of product is equal to:  
     
  
 where   
C1=arsenic  content of test solution expressed in mg/L  read from calibration curve;  
C2= arsenic  content of blank solution expressed in mg/L  r ead from calibration curve;  
M0=Mass in grams of sample taken for analysis  
V=volume in ml of sample dilution  
NOTE     If the test solution was diluted, then the dilution factor shall be taken into consideration in calculation.  
E.7.2 Expression of results  
E.7.2.1  Report results of Arsenic content in mg/L as As in the sample into two significant figures.  
E.8 Method validation  
E.8.1  Precision repeatability  
The absolute difference between two independent tests results, obtained using the same method, on identi cal 
test material, in the same laboratory by the same operator, using the same equipment, within a short interval 
of time shall be not greater than 10 % of the arithmetic mean of the two results.  
E.8.3 Working range  
As 10 – 100 ppb  
 Annex  F 
(normative)  
 
Determination of hydrogen peroxide content   
F.1 REAGENTS  
F.1.1  Dilute Sulphuric Acid  
F.1.2  Potassium Permanganate Solution —  N/10, freshly standardized.  
F.2 PROCEDURE  
Take 10 g of the developer and dilute to  500 mL . Take 25 mL of this dilute solution in a conical flask, add 5 mL 
of sulphuric acid and titrate against potassium permanganate  solution . 
F.3 CALCULATION  
H2O2 assay, per cent m/m  = 
34.02 x MVN  
where,  
V= volume of potassium permanganate solut ion taken for titration ; 
N= normality of potassium permanganate solution;  and 
M= mass of developer taken to prepare 500 mL solution.  
 
 
 
 
 
 
 
 
  
 Certification marking  
Products that conform to Uganda standards may be marked with Uganda National Bureau of Sta ndards 
(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 oper ated 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 sy stem 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 an d conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 DUS 1622 : 2015    
 
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