DRAFT UGANDA STANDARD  
  DUS 2112 -1 
First  Edition  
2018 -11-21 
 
 
 Reference number  
DUS 2112 -1:2018 
© UNBS 2018   
  
Water Soluble Type Wood Preservatives -Part 1. Acid -Copper -
Chrome (ACC) Preservative  
  
 DUS 2112 -1:2018  
ii © UNBS  2018  – 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 co ntract. Users are 
responsible for its correct application  
© UNBS 2018  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
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permission from UNBS.  
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Fax: +256 414 286 123  
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Web: www.unbs.go.ug  US 2112 -1:2018  
© UNBS 2018  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 scope  ................................ ................................ ................................ ................................ ................................  1 
2 Normative References ................................ ................................ ................................ ...........................  1 
3. Composition and Properties of Preservative  ................................ ................................ ..............................  1 
Bibliography  ................................ ................................ ................................ ................................ ........................  3 
 DUS 2112 -1:2018  
iv © UNBS  2018  – All rights reserved  
 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, a nd  
(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 a rea 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 public for c omments. 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  12, furnitur e  US 2112 -1:2018  
© UNBS 2018  – All rights reserved  v 
 DRAFT UGANDA STANDARD  DUS2112 -1:2018  
 
© UNBS yyyy – All rights reserved  1 
 Water soluble type wood Preservatives -Part 1. Acid -copper -chrome (ACC)  
Preservative  
1 scope  
This Draft Uganda S tandard c overs the requirements for acid –Copper chrome  a water -soluble ( fixed ) type 
wood preservative specified fo r treatment  of timber and oth er ligno cellulosic materials  as given in DU S 2099   
This specification covers th e composition of the preservative, quality  of chemicals for ming th is composition, 
and sampling procedure for  analysis. 
2 Normative R eferences  
DUS 2112 -2:2018, Water soluble type wood pr eservative –Part 2; copper -chrome -boron (CCB) 
wood preservative   
3 Composition  and Properties of P reservative    
 
3.1 Acid -copp er-chrome preservative  formulation shall consist of the  following active ing redients in 
nominal proport ions by weighing as shown b elow:  
 
Chromic ac etate/boric acid C r (C2H2O)3 H 2O  5 
 
Copper sulp hate CuS0 4 5H2O      50 
 
Or 
 
Sodium Dichromat e Na2 Cr2O 2H2O 
 
Potassium dichromate K 2 Cr2 O7     45 
 
3.2 The percentage of any of the ingredients shall not be less than  proportions shown bel ow: Chromic 
acetate/boric acid Cr( C2 H3 O2 ),.H 2O   4.75  
Copper sulphate   CuSO 4 .5H 2O       47.50  
Sodium Dichromate   Na2 Cr2O 2H 2O 
 
Or 
Potassium dichromate   K2 Cr2 O73     42.50 
 
 
3.3 The preservative may be in a dry solid form, semi -liquid paste or  solution,  
 
3.4 pH Value - The PH value of solution ready for use shall not be  lower than 2.7 nor higher than  
 
3.5 when determined by means of a  glass electrode at 15.5’C:.  
 
3.6 In case of dry solid, the preservative shall contain not less than 95  percent o f the acti ve ingredients 
mentioned under 3 .1. 
  
2 © UNBS 2018  – All rights reserved  
 3.6.1 In all cases the percentage of active ingredients, total active  compounds and amount of moisture shall 
be labelled on the container  as well as descriptive literature of the product.  
 
2.3.7 Each of the ch emicals used for such formulation shall be not less  than of ‘35 percent purity.  
 
4. Sampling  
 
4.1 Samples shall he taken from requisite number of drums out of the  supply ma de at one part icular time as 
per samplin g procedures  laid down *.  
 
4.2 In case of so lution or paste, the same sh all be thoroughly mixed  with a rod and at lea st 1 kg sample shall 
be taken f or chemical analysis from  each drum . 
 
4.3 In case of dry powder form, a true representative  sample of the  material, not less than one pe rcent of the 
contents shall be taken for  analysis.  
 
4.4 At least 1 kg of the preservative shall be dissolved to obtain 1.5  percent solution of the preservative.  
 
4.5 A small amount of the 15 percent solution may be drawn and  diluted exactly t o 5 percent for chemical 
analy sis. 
 
5. Testing  
 
The chemical analysis of the so lution with respect to its various ingredients  shall be carried out 
according to the prescribed methods of estimation . The proportion of all  chemicals shall comply with 
3.1 and 3 .1.1. 
 
6. Marking  
 
6.1 Each c ontainer shall be legibly marked with the following  information:  
 
a) Manufacturer’s name or trade -mark,   
 
b) Date of manufacture; and  expiry date  
 
c) Percentage  of dry active ingredients.  
d) Instruction for use.  
 
  
 
 . 
 
 
 DUS 2112 -2:2018  
© UNBS  2018  – All rights reserved  3 
 Bibliography  
[1] IS 10013 -3: 1961    specification for water soluble type wood preservatives (ACC).  
  
 DUS 2112 -1:2018  
© UNBS yyyy – All rights reserved  5 
 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 accordance with the 
certificati on 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 
Nationa l Bureau of Standards.  
 
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