DRAFT UGANDA STANDARD  
  DUS EAS 848 
First  Edition  
2015-06-30 
 
 Reference number  
DUS EAS 848: 2015 
© UNBS 201 5 
  
Water-thinned priming paints for wood —Specification  
  
ii                © UNBS 2015 - 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 application  
© UNBS 2015 
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
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© UNBS  2015 - All rights reserved                iii National 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 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 public for comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
This Draft Uganda Standard, DUS EAS 848: 2015, Water-thinned priming paints for wood — Specification , is 
identical with  and has been reproduced from an East African  Standard , EAS 848: 2015, Water -thinned priming 
paints for wood —Specification , and is being proposed for adoption  as a Uganda Standard.  
Wherever the words, “ East African Standard" appear, they should be replaced by "Uganda Standard." 
 
   FDEAS 848: 2015 
ICS 87.040  
© EAC 2015                                                                                                                              First Edition 2015  
 
FINAL DRAFT EAST AFRICAN STANDARD 
 
Water -thinned priming paints for wood — Specification  
EAST AFRICAN COMMUNITY  FDEAS 848: 2015  
ii © EAC 2015  – All rights reserved  
 Copyright notice 
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participants in the EAC standards development process is permitted without prior permission from EAC, 
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© East African Community 2015  — All rights reserved 
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Reproduction for sales purposes may be subject to royalty payments or a licensing agreement. 
Violators may be persecuted 
 FDEAS 848: 2015 
© EAC 2015  – All rights reserved  iii 
 Foreword 
Development of the East African Standards has been necessitated by the need for harmonizing requirements 
governing quality of products and services in the East African Community. It is envisaged that through 
harmonized standardization, trade barriers that are encountered when goods and services are exchanged 
within the Community will be removed.  
In order to achieve this objective, the Community established an East African Standards Committee mandated 
to develop and issue East African Standards.   
The Committee is composed of representatives of the National Standards Bodies in Partner States, together 
with the representatives from the private sectors and consumer organizations. Draft East African Standards 
are circulated to stakeholders through the National Standards Bodies in the Partner States. The comments 
received are discussed and incorporated before finalization of standards, in accordance with the procedures 
of the Community. 
East African Standards are subject to review, to keep pace with technological advances. Users of the East 
African Standards are therefore expected to ensure that they always have the latest versions of the standards 
they are implementing .  
FDEAS 848 was prepared by Technical Committee EASC/TC 07 0, Paints, varnishes and related products . 
 
 FINAL DRAFT EAST AFRICAN STANDARD  FDEAS 848:2015  
 
© EAC 2015  – All rights reserved  1 
 Water -thinned priming paints for wood — Specification  
1 Scope 
This Final Draft East African Standard specifies requirements , sampling  and test methods for water-thinned 
priming paints intended for application  by brush,  roller spray  or any other suitable method to the exterior and 
interior of soft wood joine ry. 
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. 
ISO 3856- 1, Paints and varnishes — Determination of soluble metal content — Part 1: Determination of lead 
content — Flame atomic absorption spectrometric method and dithizone spectrophotometric method  
ISO 4618, Paints and varnishes — Terms and definitions  
ISO 6504-3, Paints and varnishes — Determination of hiding power — Part 3: Determination of contrast ratio 
of light coloured paints at a fixed spreading rate  
ISO 9117-3, Paints and varnishes — Drying tests — Part 3: Surface drying test using Ballotini  
ISO 11890- 1, Paints and varnishes — Determination of Volatile Organic Compound (VOC) content — Part 1: 
Difference method 
ISO 15528,  Paints, varnishes and raw materials for paints and varnishes — Sampli ng 
ISO 21207, Corrosion tests in artificial atmospheres — Accelerated corrosion tests involving alternate 
exposure to corrosion-promoting gases, neutral salt-spray and drying  
3 Terms and definitions 
For the purposes of this standard, the terms and definitions given in ISO 4618 shall apply . 
4 Requirements 
4.1 General requirements 
4.1.1  Composition  
The paint sha ll be based on a pigmented aqu eous emulsion of a suitable polym er. Neither the emulsion nor 
the paint based on it shall contain any added plasticizer.  
2 © EAC 2015  – All rights reserved  
 4.1.2 Co mpatibility with glazing put ty 
When the paint is used to prime glazing bar s, putty shall adequately a dhere to the dried film of the pain t, and 
the paint sha ll have no deleter ious effect upon the drying properties of the putty. Whe n tested in accordance 
with the metho d described in Annex A, the condition of the putty after drying for 40 h sha ll be such that: 
a) it can be painted , with a good quality alk yd or aloe- resinou s white under coating , without lifting o r 
disturbance of its surface; and 
b) the coat of the white undercoat applied as in (a), shall dry in 24 h and no t show discoloration, 
wrinkling, grittiness or o ther defects. 
4.1.3  Storage stability 
The p aint when stored in the orig inal sealed co ntainer under room temperature, shall meet all the 
requirements specified in this standard f or a period of o ne year from the date of manufacture.  
4.1.4 Condition in the  contain er 
4.1.4.1  The paint shall: 
a) have no irritating or offensive odour; 
b) be free from lumps and skins ; and  
c) be free fr om mould and petrifica tion. 
4.1.4.2  The condition of the paint shall be such that settling, if any, shall be easily incorporated by stirring.  
4.1.5  Application properties 
When the paint is applied, it shall give a dry film which is smooth, uniform and free from surface imperfection. 
4.2 Specific requirements 
The paint shall comply with the requirements specified in Table 1, when tested in accordance with the 
methods therein. 
Table 1 — Specific requirements for water-thinned priming paints for wood 
Characteristic  Requirement  Test method  
Non-volatile content, % (m/m) , min. 50 ISO 11890 -1 
Hard-drying time at film thickness of 50 µm - 60 µm, minutes, 
max. 75 ISO 9117 -3 
Blister resistan ce, % of blisters of area covered under test , 
max. 5 Annex  B 
Dry opacity, %, min. 90 ISO 6504 -3 
Resista nce to nat ural weather ing, % deteriorated area after six  
months exposure , max. 5 Annex C  
Resista nce to ac celerated weath ering, h, max.  300 ISO 21207  
Lead content, ppm, max.  100 ISO 3856 -1 
  
© EAC 2015  – All rights reserved  3 
 5 Weights and measures 
The fill and volume of the paint,  shall comply with Weights and Measures regulations of the respective  Partner 
State s. 
6 Packaging, labelling and marking 
6.1 Packaging 
The paint shall be packaged in a suitable container that prevents it from deterioration during storage, 
transportation and normal handling. 
6.2 Labelling and marking 
6.2.1 The labelling shall be either in English, Kiswahili or French or in combination as agreed between the 
manufacturer and the supplier. Any other language shall be optional. 
6.2.2 The paints shall be packaged in containers that are legibly and indelibly marked with the following 
information: 
a) the name of the product shall appear as ” Water -thinned priming paints for wood” ; 
b) manufacturer ’s name and/or registered trade mark; 
c) indication of colour/colour code; 
d) date of manufacture; 
e) net content; 
f) batch/code number; 
g) country of origin; 
h) expiry date or best before date ; and  
i) instructions for use and safety. 
7 Sampling 
Sampling shall be done in accordance with ISO 15528. 
  
4 © EAC 2015  – All rights reserved  
 Annex A 
(normative) 
 
Test for compatibility with glazi ng putty 
A.1 Materials and apparatus  
A.1.1 Suitable putty knife 
A.1.2 Wood moulding, length approximately 250 mm, with a 12 .5 mm x12.5 mm rebate dow n its length, 
made from a piece of solid wood which is free fro m knots  
A.1.3  Linseed oil put ty 
A.2 Procedure 
A.2.1 Apply a coat of the p aint to the wood moulding and allow it to dry for seven days. The n with a spatula , 
fill the moulding with putty and smooth off with one s troke of the putty knife to a clean surface so that a cross 
section of the putty present s a tria ngular are a. 
A.2.2 After allowin g the putty to dry for 4 8 h at a tem perature of 25 ºC ± 2 º C and a relative hu midity o f 65 % 
± 2 %, coat the surface o f the putty with a good quality a lkyd or oleo-resinous white under- coat by means of a 
brush and allow to dry for 24 h under the same conditions . Observe if there is any lifting or disturbance of th e 
putty surface during coating. 
A.2.3 After the 24- h drying per iod, determin e whether the white under-coat is surface-dry by carrying ou t the 
test descr ibed in accordance with ISO 9117-3 and als o examin e the undercoat film for discoloration, wrinkling , 
grittiness or othe r defects.   
© EAC 2015  – All rights reserved  5 
 Annex B 
(normative) 
 
Test for blister resistance 
B1. Materials and apparatus  
B.1.1 Blister box, as shown in Figure B .1. The box is constructed of 20-mm thick wood and has two 
pieces of 12.5 mm  aluminium angle fixed across the  top to suppo rt the test panels. 
B.1.2 Two panel s of pine , 150 mm x 1 00 mm x 20 mm, rubbed smooth  with No. 0 gl ass paper 
B.1.3 Magnifying lens , X3 
Dimensions in millimetres 
 
 
 
 
 
Figure B .1— Example of a blister box 
B.2 Procedure 
B.2.1  Coat one face and all edges of duplicate panels of the soft wood with the paint and allow them to dry 
for 2 h at a temperature of 25 ºC ± 2 ºC and a relative humidity of 65 % ± 2 %. Then overpaint the primed 
surface of each panel with a good quality alkyd or oleo-resinous undercoat and allow to dry for 16 h - 24 h. 
Apply a coat of alkyd gloss finish paint and allow to dry at a temperature of 25 ºC ± 2 ºC and a relative 
humidity of 65 % ± 2 % for seven days. 
B.2.2 After this period, place the blister box over a water-bath (an electrically heated bath is very suitable) 
controlled at a temperature of 65 ºC ± 2 ºC and place the panels on the box with the face which is unpainted 
downwards for a period of 50 h. Unused spaces of the box shall be covered with panels. 
B.2.3 After this period, remove the panels and examine the painted faces with X3 magnification for blistering 
and cracking.  
6 © EAC 2015  – All rights reserved  
 Annex C 
(normative) 
 
Method of test for resistance to natural weathering 
C.1 Apparatus 
C.1.1 Cypre ss wood , with a water content no t exceeding 13 % and free from funga l infection 
C.1.2 Panels, of dimensions 304 mm x 95 mm x 20 mm cut from cypress woo d with a straight sided groove, 
254 mm x 15 mm x 6 mm deep cut in th e centre of the face on the outer sid e of the pane ls 
C.2 Procedure 
Paint all sides an d edges of triplicate panels with one  coat of the paint and then expose the panels 
horizontally, grooved face upper  most, in an open position for the specified period. Th en examine the panels 
using a X10 magnification for signs of de terioration of the film for example, crackin g, flaking or chalking. 
Failures resulting fr om obvious defects in  the substrate shall be  ignored.  
© EAC 2015  – All rights reserved  7 
 Bibliography 
KS 667:2013,  Water-thinned priming paints for wood — Specification  
 
 
 FDEAS 848 : 2015    
 
© EAC 2015 – All rights reserved