 DRAFT UGANDA STANDARD  
  DUS 2567  
First  Edition  
yyyy -mm-dd 
 
 
 Reference nu mber  
DUS 2567 : 2022 
© UNBS yyyy   
  
Copper — Specification  
 DUS 2567 :2022  
© UNBS yyyy  – All rights reserved  ii 
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Web: www.unbs.go.ug  DUS 2567 :2022  
© UNBS yyyy  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 General Specification  ................................ ................................ ................................ ............................  2 
4.1 Refinery Shapes  ................................ ................................ ................................ ................................ .... 2 
4.2 Purity ................................ ................................ ................................ ................................ .......................  2 
4.3 Grades and designation ................................ ................................ ................................ ........................  2 
4.4 Shape  ................................ ................................ ................................ ................................ ......................  2 
4.5 Dimensions, masses and tolerances  ................................ ................................ ................................ .. 3 
4.5.1  Horizontally Cast Wire Bars  ................................ ................................ ................................ .................  3 
4.5.2  Billets  ................................ ................................ ................................ ................................ ......................  4 
4.5.3  Other Shapes  ................................ ................................ ................................ ................................ .........  4 
6 Chemical composition  ................................ ................................ ................................ ..........................  5 
7 Freedom from defects  ................................ ................................ ................................ ...........................  8 
8 Electrical properties  ................................ ................................ ................................ ..............................  8 
8.1 Resistivity  ................................ ................................ ................................ ................................ ...............  8 
8.2 Resistivity Test  ................................ ................................ ................................ ................................ ...... 8 
8.3 Hydrogen embrittlement test for CU -DHP, Cu -DPA and CU -ATP ................................ .....................  8 
9 Sampling  ................................ ................................ ................................ ................................ ................  9 
9.1 Lot ................................ ................................ ................................ ................................ ...........................  9 
9.1 Sampling  ................................ ................................ ................................ ................................ ................  9 
10 Marking  ................................ ................................ ................................ ................................ ...................  9 
Annex  A (Informative)  Correlation of the material designation of old ISO grades with new ISO 
grades  ................................ ................................ ................................ ................................ ...................  11 
Annex  B (informative)  Sampling and c riteria for conformity  ................................ ................................ ...... 12 
Bibliography  ................................ ................................ ................................ ................................ ......................  13 
 DUS 2567 :2022  
© UNBS yyyy  – All rights reserved  iv 
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade , Industry and 
Cooperativ es 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 stakeholders 
including government, academia, consumer groups, private sector and other interested parties.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholde rs 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.  
The committee responsible for this document is Technical Committee UNBS /TC 312 Minerals . DUS 2567 :2022  
© UNBS yyyy  – All rights reserved  v 
  
 DRAFT UGANDA STANDARD  DUS 2567: 2022  
 
1     © UNBS yyyy  – All rights reserved  
 Copper  — Specification  
1 Scope   
This draft Uganda standard specifies requirements and methods of sampling and test of various types of 
copper in the form of refine ry shapes . 
2 Normative references   
The following referenc ed 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 (inc luding any amendments) applies.  
DUS ISO 197 -1:1983  Copper and copper alloys — Terms and definitions — Part 1: Materials  
NWI 3757: 2022  Standard Test Methods for Chemical Analysis of Copper Alloys  
NWI 3766: 2022  Standard Test Method for Resistivity of Elect rical Conductor Materials  
DUS ISO 1190 -1:1982 Copper and copper alloys — Code of designation — Part 1: Designation of materials   
3 Terms and definitions   
For the purposes of this document, the terms and definitions given in DUS ISO 197 -1:1983  and the follo wing 
apply.  
ISO and IEC maintain terminological databases for use in standardization at the following addresses:  
— ISO Online browsing platform: available at http://www.iso.org/obp  
3.1  
Cathode Copper  
Unwrought flat product produced by electro refining,  /electro winning.  
3.2  
Casting Copper   
Fire refined tough pitch copper, usually cast from melted secondary metal into ingot and ingot bars only and 
used for making foundry castings.  
3.3  
Annealing  
heat treatment process that changes the physical and somet imes also the chemical properties of a material to 
increase ductility and reduce the hardness to make it more workable   
  
© UNBS yyyy  – All rights reserved  2 
 4 General Specification  
4.1 Refinery Shapes  
The refinery shapes  shall include horizontally, vertically  and continuous ly cast wire bars,  cakes, billets and 
ingots.  
Wire bars, cakes and billets are intended for fabricating into wrought products, ingots are intended for alloying 
in wrought and copper alloys  
4.2 Purity  
The minimum copper content shall be 99.85 percent  
4.3 Grades and designati on 
The grades/designations of copper shall be as given in Table 1  or in accordance  to those specified in DUS 
ISO 1190 -1:1982  
Designations for unalloyed topper shall consist of the international Chemical Symbol of the element (Cu), 
followed by a  series of c apital letters referring to the type of topper.  
The capital letters shall be sep arated from the Chemical Symbol by a hyphen to indicate that these letters do 
not correspond to  Chemical symbols, for example CU -ETP, CU -DHP, Cu -FRHC.  
 
4.4 Shape  
The refinery shapes currently produced are shown in Table 1. In each type, the specific coppers are  not 
necessarily available  in a complete range of sizes in the forms shown  
Table 1   Grade/Designation of Copper and Their Refinery Shapes  
Grades/ 
Refinery 
Shapes 
Availabl e 
from Refiners  
Designations  Type of 
Copper  Form of Refinery Shapes Available from Refiners  
Wire Bars  Billets  Cakes  Ingots and  
Ingot Bars  Cathodes  
CU-CATH - I Electrolytic 
cathode  - - - - x 
CU-CATH -2 Electrolytic 
cathode  - - - - x 
CU-ETP Electrolytic  
tough pitch  x X x x - 
CU-FRHC  Fire-refined , 
high 
conductivity , 
high-
conductivity  x X x x - 
CU-FRTP - 1 Fire-refined 
tough pitch  - X x x - 
CU-FRTP -2       
CU-DHP  Phospherized, 
deoxidised - X x - -  
© UNBS yyyy  – All rights reserved  3 
 non-arsenical , 
high residual  
phosphorus  
CU-ATP Arsenic,  tough 
pitch  - x x - - 
CU-DPA Phosphorized, 
arsenical  - x - - - 
X Commercially available  
 
4.5 Dimensions, masses and tolerances  
4.5.1 Horizontally Cast Wire Bars  
Horizontally cast wire bars of various nominal masses shall conform to the appropriate dime nsions and  
tolerances given in Table 2.  
Table 2   Masses and Dimensions of Horizontally Cast Wire Bars  
Dimensions  
(mm)  Tolerances  
(mm)  Mass, kg  
91 102 113 120 125 136 
L ±14 1370  1370  1370  1370  1370  1370  
L ±6 150 150 150 150 150 150 
h ±6 90 100 100 110 110 110 
h1 ±6 25 25 25 25 25 25 
b ±6 100 100 110 110 110 110 
b1 ±6 90 90 100 100 100 100 
R ±6 16 16 25 25 25 25 
R1 ±6 16 16 16 16 16 16 
R2 ±6 40 40 40 40 40 40 
Α degrees  ±20 10 10 10 10 10 10 
Β degrees  ±20 10 10 10 10 10 10 
δdegrees  ±10 3 3 3 3 3 3 
  
© UNBS yyyy  – All rights reserved  4 
 
 
Figure 1 showing shapes of horizontally cast wire bars  
4.5.2 Billets  
Billets shall be of a cylindrical shape with both ends flat. The mass, diameter ,length and the maximum  
deviation from straightness shall conform to the tolerances given in Table  3. 
4.5.3  Other Shapes  
The mass, dimensions and straightness of vertically (either statically or continuously) cast wire bars, vertically 
and horizontally cast cakes and ingots, shall conform to the tolerances given in Table 3.  
 
Table  3  Tolerances on Mass an d Dimensions for Refinery Shapes Other than Horizontally Cast Wire 
Bars 
Refinery 
Shape  Tolerances  
Mass %  Diameter mm  length  Width and 
thickness  Other 
dimension  Maximum 
deviation 
from 
straightness 
per 1000 mm 
length mm  
Billets  ±5 ±3 2 percent of 
order le ngth - - ±4 
Vertically ±5 - - ±3 ±6 —  
© UNBS yyyy  – All rights reserved  5 
 continuously  
cast wire bars  
Vertically static 
cast wire bars  ±5 - - ±6 ±6 - 
Cast cakes 
width, 
thickness up to 
200 mm  ±5 - - ±3 - ±4 
Cast cakes 
width, 
thickness over 
200 mm  ±5 - - ±6 - ±4 
Ingots  ±10 - - - - - 
 
6 Chemical composition  
Copper of all designations shall conform to compositional requirements specified in Table 4.  
  
© UNBS yyyy  – All rights reserved  6 
 Table  4  Chemical  composition  Designation  
Copper + silver (by 
difference ), max  
Silver, max  
Copper( any silver 
present to be counted 
as copp er), min  
phosphorus  
Arsenic, max  
Antimony, max  
Bismuth,  
max 
Iron, max  
Lead, max  
Nickel, max  
Oxygen, max  
Selenium, max  
Tellurium, max  
Tin, max  
Zinc, max  
Selenium + Tellurium, 
max 
Total impurities  
CU-
CATH - I 99.99  25 
ppm - - 5 ppm  4 ppm  2 ppm  10 
ppm 5ppm  10 
ppm - 2 ppm  2 ppm  - - 3 ppm 
(including 
bismuth)  65 ppm 
(excluding 
oxygen)  
CU-
CATH -2 99.90  - - - - - 0.001  - 0.005  - - - - - - - 0.03 
CU-ETP 99.90  - - - - - 10 ppm  - 0.005  - 0.045  - - - - - 0.03 
(excluding 
oxygen  and 
silver)  
CU-
FRHC  99.90  - - - - - 10 ppm - 0.005  - 0.045  - - - - - 0.03 
(excluding 
oxygen and 
silver)  
CU-
FRTP - 1 - - 99.85  - 0.02 0.005  0.03 0.01 0.005  0.05 0.1 - - 0.01 - 0.025  0.05 
CU-
FRTP -2 - - 99.50  - 0.01 0.05 0.02 0.03 0.1 0.5 0.1 - - 0.05 - 0.07 - 
CU-DHP  99.80  - - 0.015 
-0.10 0.05 0.005 0.003  0.03 0.01 0.1 - - 0.01 0.01 - 0.02 0.06 
(excluding 
silver, 
nickel, 
arsenic and 
phosphorus 
and silver)   
© UNBS yyyy  – All rights reserved  7 
 CU-ATP 99.20  - - - 0.2-0.5 0.01 0.005  0.02 0.02 0.15 0.1 - - 0.03 - 0.03 - 
CU-DPA 99.20  - - 0.015 
-0.10 .2-0.5 0.01 0.003  0.003  0.001  0.15 - - 0.01 0.01 - 0.02 0.06 
(excluding 
silver, 
nickel, 
arsenic and 
phosphorus  
Unless otherwise indicated all limits are in percentages  
 
 DUS 2567 :2022  
8     © UNBS yyyy  – All rights reserved  
  
7 Freedom from defects  
Cathod es shall be reasonably free fr om nodules and  all foreign materials, such as copper sulphate , dirt, 
grease  and oil, and shall withstand ordinary handling without  breakage.  
Cakes, billets and wire bars shall be substantially free  from shrink, holes, cracks, cold sets, pits, sloppy edges,  
concave tops and other similar defects in set or casting.  
NOTE — This does not apply to ingots and ingot bars, in which physical defects are of minor consequence  
8 Electrical properties  
8.1 Resistivity  
Copper shall have res istivity at a temperature of 200C (Annealed) not exceedi ng the values given in Table 5.  
8.2 Resistivity Test  
Samples for the resistivity test shall be prepared in the form of wire of approximately 2.0 mm diameter, which 
shall be annealed at a temperature of 525 to 550°C for not less than 30 min. The measurement of resistivity 
shall be carried out to an accuracy of at least one part in a thousand.  
For the test method, reference may be made to NWI 3766: 2022  
The length of sample selected for the test shall be sufficient to give the accuracy required and shall be 
suitable for the method of testing em ployed. If the sample fails, a fresh sample may be tak en and the 
resistivity checked.  
8.3 Hydrogen embrittlement test for CU -DHP, Cu -DPA and CU -ATP 
The edges  of the test pieces should be carefu lly rounded  and smoothened longitudinally . After being exposed 
to an atmosphere of hydrogen for 30 min at 800 to 875°C and subsequently cooled in the container itself (out 
of contact with air), the test pieces shall be subjected to a close bend test as described in 8.3.1  to 8.3.2 . 
8.3.1  The test piece AB is bent by st eadily applied pressure, or a succession of blows, at right angles to the 
length AC and flattened close until A assumes the pos ition indicated by D (see Fig. 2) 
8.3.2  The convex surface of the bend portion shall not reveal any cracks, openings or porosity.  
For the purpose of this test, one piece of copper shall be selected from each hundred, or part thereof in the 
consignment or ord er, and the test piece taken fr om the pieces so selected.  
Table 5   Physical Properties  
Designation  Electrical Properties  Tests Required  
Mass 
resistivity, 
ohm g/m2   
(max)  Nominal 
Volume 
ohm 
mm2/m 
(max)  Nominal conductivity  Chemical 
Analysis  Mass 
Resistivity 
Test Hydrogen 
Embrittlement 
Test 
MS/ Percent 
ISCS  
CU-CATH - I 0.151 76  0.1707  58.58  101.0  x X  
CU-CATH -2 0.153 28  0.1724  58.00  100.0  X X   
© UNBS yyyy  – All rights reserved  9 
 CU-ETP 0.153 28  0.1724  58.00  100.0  X X  
CU-FRHC  0.152 28  0.1724  58.00  100.0  X x  
CU-FRTP - 1     X   
CU-FRTP -2     X   
CU-DHP      X  x 
CU-ATP     X   
CU-DPA     X  x 
Note The values for nominal resistivity and nominal conducti vity are given for  
 
  
Figure 2 Closed bend test   
9 Sampling  
9.1 Lot 
For the determination of the copper content, consignments up to a total mass of about 300 t ones  should be 
considered as a single lot, provided that the whole of the consignment is of th e same charge and consists of 
uniform shapes. Consignments exceeding 300 t ones in total mass should be divided into lots of approximately 
equal size.  
If a consignment consists of several charges and/or different shapes, the consignment should be divided in to 
lots according to charges and shapes. The size of the lots depends on the charges and shapes forming the 
consignment concerned and/or on the arrangements made between the interested parties.  
9.1 Sampling  
The method of drawing representative samples of t he material and the criteria for conformity shall be as given 
in Annex B . 
10 Marking  
10.1  All shapes intended for fabrication shall be marked to identify the batch/lot number and 
manufacturer’s trade -mark.  
In addition to th e marking stipulated in 10.1 , the following information shall be provided  by the manufacturer ; 
 
© UNBS yyyy  – All rights reserved  10 
 a) Percentage Purity  
b) Quantity of product required (kg or t ones ) 
c) Material designation  or grade ; 
d) Cross -sectional shape required of billet, wire bar, cake and ingot  
e) Dimensional tolerances  (mm); 
f) Name and address of the manufacturer  
g) Lot number  
  
© UNBS yyyy  – All rights reserved  11 
 Annex  A 
(Informative)  
 
Correlation of th e material designation of old ISO grades with new ISO  
grades  
Table showing  correlation of the material designation of old ISO grades with new ISO grades   
Old designation  New designation  
- CU-CATH - I 
(New Grade added)  
CATH  CU-CATH -2 
ETP CU-ETP 
FRHC  CU-FRHC  
FRTP -1 CU-FRTP - 1 
FRTP -2 CU-FRTP -2 
DHP  CU-DHP  
AT P  CU-ATP 
D PA  CU-DPA 
.  
© UNBS yyyy  – All rights reserved  12 
 Annex  B 
(informative)  
 
Sampling and crit eria for conformity  
The number of cast wire bar/cake/ingot/billets to be ins pected from a lot for freedom fr om defects and size, 
shape and mass  shall be in accordance of Table 6. In the case of those lots which have been with Col 1 and 
Col 2 of Table 6  
Table 6 Number of Cast Wire Bar/Cake/Ingot/Billets to be Inspected and Permissible Number of 
Defective  
No. of Cast Wire  
Bar/Cake/Ingot/Billets  
in the Lot  No. of Cast Wire  
Bar/Cake/Ingot/Billets  
to be Inspected  Permissible Number  of Defective1 
up to 50  All +2 
51-150 50 1 
151-300 80 2 
301-500 125 3 
501 and above  200 5 
1) This ensures that lots containing only one percent defective cast wire bar/cake/ingot/billets or less will accepted 
most of the time  
2) The defective encountered shall be removed and only the re maining cast wire bar/cake/ingot/billets shall be 
accepted  
  
© UNBS yyyy  – All rights reserved  13 
 Bibliography  
[1] IS 191: 2007 copper  — specification  
[2] ISO ##### -##:20##, General title — Part ##: Title of part   
© UNBS yyyy  – All rights reserved  14 
 Certification marking  
Products that conform to Uganda standards may be marked w ith 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 t he 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 
require ments 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 2567 : 2022    
 
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