DRAFT UGANDA STANDARD  
  DUS 1867  
First Edition  
2018-10-dd 
 
 
 Reference number  
DUS 1867: 2018  
© UNBS 2018   
  
Stainless steel milk cans — Specifications  
 DUS 1867: 201 8 
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 contract. Users are 
responsible for its corre ct application  
© UNBS 2018  
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 written 
permis sion 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 1867: 2018  
© UNBS 2018 – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Capacity  ................................ ................................ ................................ ................................ ..................  1 
5 Shape and dimensions  ................................ ................................ ................................ .........................  1 
6 Manufacture  ................................ ................................ ................................ ................................ ...........  2 
6.6 Construction  ................................ ................................ ................................ ................................ ..........  5 
6.6.1  Body  ................................ ................................ ................................ ................................ ........................  5 
6.6.2  Handle  ................................ ................................ ................................ ................................ .....................  5 
6.6.3  Bottom ring  ................................ ................................ ................................ ................................ ............  5 
6.6.4  Lid ................................ ................................ ................................ ................................ ...........................  5 
6.6.5  Welding  ................................ ................................ ................................ ................................ ...................  5 
6.6.6  Finish  ................................ ................................ ................................ ................................ ......................  6 
6.6.7  Heat treatment and passivation  ................................ ................................ ................................ ...........  6 
6.6.8  Hardness  ................................ ................................ ................................ ................................ ................  6 
7 Tests  ................................ ................................ ................................ ................................ .......................  6 
7.1 Pressure check for leakage/bulging  ................................ ................................ ................................ .... 6 
7.2 Drop test at rated capacity  ................................ ................................ ................................ ...................  6 
7.3 Hardness test  ................................ ................................ ................................ ................................ .........  6 
7.4 Dye penetration test  ................................ ................................ ................................ ..............................  6 
7.5 Leakage test  ................................ ................................ ................................ ................................ ...........  6 
8 Marking  ................................ ................................ ................................ ................................ ...................  7 
9 Sampling and criteria for conformity  ................................ ................................ ................................ .. 7 
Annex  A (normative)  Sampling of stainless steel milk cans  ................................ ................................ ........  8 
A.1 Scale of sampling  ................................ ................................ ................................ ................................ .. 8 
A.2 Number of tests and criteria for conformity  ................................ ................................ .......................  8 
Bibliography  ................................ ................................ ................................ ................................ ......................  10 
 DUS 1867: 201 8 
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 unde r 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 give n 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 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.  
The committee responsible for this document is T echnical Committee UNBS/TC 1 9, Packaging and 
Packaging products  
  DRAFT UGANDA STANDARD  DUS 1867: 201 8 
 
© UNBS 2018 – All rights reserved  1 
 Stainless steel milk cans — Specifications  
1 Scope  
This draft Uganda standard prescribes the requirements, sampling criteria and test methods of stainless steel 
milk cans used for collection and distribution of fluid milk. This standard covers cans of 5, 10, 20, 30, 40 and 
50 litres capacities.  
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) applies.  
ISO 6506 -1, Metallic materials — Brinell hardness test — Part 1: Test method   
DUS 1790, Measurement  of roughness average Ra and peak count RPc on metallic flat products  
ISO 3452 -1, Non -destructive testing — Penetrant testing — Part 1: General principles  
ISO 24153, Random sampling and randomization procedures  
3 Terms and definitions  
No te rms and definitions are listed in this document .  
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  
4 Capacity  
The rated cap acity of the can shall be taken as the quantity of water measured in litres which fills the can to 
the junction of the shoulder and the neck , refer to Figure 1 . This quantity shall be within a tolerance of ± 2 % of 
the rated capacity.  
5 Shape and dimension s 
The cans shall be manufactured in accordance with the shape and dimensions as given in Table 1 read with 
figures 1 to 4.  DUS 1867: 2018  
2 © UNBS 2018 – All rights reserved  
  
Table 1 — Dimensions fo r different milk can capacities  
Capacity  
(in litres ) A (Total 
Height)  
mm B (Internal 
Height ) 
mm Cϕ 
(Internal 
Diameter ), 
mm Dϕ (Neck 
Diameter ), 
mm Eϕ (Base 
Diameter ), 
mm 
5 250±3  NA 176±3  130±1  NA 
10 285±3  NA 234±3  173±1  NA 
20 435±4  411±4  280±3  200±0.5  286±3  
30 481±4  457±4  340±3  200±0.5  346±3  
40 591±4  567±4  340±3  200±0.5  346±3  
50 700±4  676±4  340±3  200±0.5  346±3  
6 Manufacture  
6.1 The cans of 5 l and 10 l capacity shall be fabricated from the sheet or coil of type 304 Stainless Steel 
having thickness of 0.8  mm ± 0.05 mm and 1.0  mm ± 0.05 mm respectively  with chemical composition as 
given in Table 2. The handle shall be made of a round bar, have a minimum diameter of 5.0 mm and shall be 
made from Stainless Steel . 
Table 2 — Composition ranges for 304 G rade stainless steel  
Grade C Mn Si  P  S  Cr  Mo  Ni  N  
304 min. - - - - - 18.0  8.0 - 
max.  0.08 2.0 0.75 0.045  0.030  20.0  10.5 0.10 
304L  min. - - - - - 18.0  8.0 - 
max.  0.03 2.0 0.75 0.045  0.030  20.0  12.0 0.10 
304H  min. 0.04 - - - - 18.0  8.0  
max.  0.10 2.0 0.75 0.045  0.030  20.0  10.5  
 
6.2 The cans of 20  l, 30 l, 40 l and 50 l capacity shall be fabricated from the sheet or coil of type 304 
Stainless Steel having thickness of 1.2  mm ± 0.05 mm. The handle shall be made from round bar of stainless 
steel of diameter 1 2 mm and the bottom ring shall be made from sheet or coil of type 304 Stainless Steel 
having thickness of 2 mm. 
6.3 Five and ten litres  capacity cans shall consist of a body (without bottom ring), lid and handle attached to 
neck with ears. The cans of 20  l, 30 l, 40 l and 50 l capacities shall consist of a body, bottom ring, lid and 
handles.  
6.4 The minimum thickness for different parts of finished cans shall be as given in Table 2.  DUS 1867: 201 8 
© UNBS 2018 – All rights reserved  3 
 
 
Figure 1 — Typical stainless steel milk can – transport type (20  l, 30 l, 40 l and 50 l) 
 
Figure 2 — Lid for stainless steel milk can, transport type (20  l, 30 l, 40 l and 50 l) DUS 1867: 2018  
4 © UNBS 2018 – All rights reserved  
 
 
Figure  3 — Typical stainless steel milk can (5 l and 10 l) 
 
Figure 4 — Lid for stainless steel milk can (5 l and 10 l) DUS 1867: 201 8 
© UNBS 2018 – All rights reserved  5 
 Table 3 — Minimum thickness for different parts of the cans (in millimetres)  
Part Capacity  
(l) 
5 10 20 30 40 50 
Body  0.5 0.6 1.0 1.0 1.0 1.0 
Bottom  0.6 0.8 1.1 1.1 1.1 1.1 
Neck  0.4 0.4 0.95 0.95 0.95 0.95 
Lid (Cup/Inner)  NA NA 0.8 0.8 0.8 0.8 
Lid 
(Saucer/Outer)  0.5 0.5 1.0 1.0 1.0 1.0 
6.6 Construction  
6.6.1  Body  
Five and ten litres cans may be formed in a single pie ce construction as given in Figure  3. The 20  l, 30 l, 40 l 
and 50 l cans body may be fabricated in two pieces as given in Figure 1. The bottom and top halves  may be 
deep drawn and spinned. The top and bottom pieces may be welded circumferentially. All welding shall be 
done with argon arc process (TIG) and ground smooth. Top edge of the neck shall be folded.  
6.6.2  Handle  
Five and ten litres can shall have flexi ble handle, attached with ears to the can body. The ears may be spot 
welded at the neck of the can. 20  l, 30 l, 40 l and 50 l can handle shall be designed to give good grip of the 
can, wel ded on the taper neck with 2  pad plate s for each handle, adequately t hick to avoid any protrusion 
inside the can.  
6.6.3  Bottom ring  
The bottom ring may be shrink -fitted with proper locking arrangement on the body. The bottom ring shall 
permit draining of water and detergent from bottom of the reversed can and there shall no t be any cavity on 
the ring, which could lead to unhygienic conditions.  
6.6.4  Lid 
The lid of 5  l and 10 l  capacity can shall be one-piece  shallow drawn and shall have a collapsible handle of 5 
mm diameter with ears spot welded on the lid as given in Fig ure 4. For 20  l, 30 l, 40 l and 50 l can the conical 
skirt shall be provided with 3 air equalizing holes.  
The lid shall have mushroom shape to drain off any water outside. T he lid shall be provided with 2  punched 
holes on the mushroom canopy near periphery of lid for locking/sealing the can. The cup and saucer portions 
of the lid shall be welded to each other circumferentially, preferably by fusion welding process and shall be 
braised all around on the inside of the lid. In case fusion welding is not done, i t shall be done by employing 
Tungsten Inert Gas (TIG) process. There shall not be any deformation or unevenness and it shall be ground 
smooth. The shape of the lid shall be as given in Figure 2.  
6.6.5  Welding  
The can shall be welded by Tungsten Inert Gas ( TIG) or Metal Inert Gas (MIG) process with argon as inert 
gas medium and only, AWS ER 308 L filler  wire shall be used.  DUS 1867: 2018  
6 © UNBS 2018 – All rights reserved  
 6.6.6  Finish  
On visual examination there shall be no cracks, notching or porous patches in the welded surfaces and the 
surface adjacent t o the weld. The weld surface shall be regular and even. All welded joints, inside surface and 
outside surface shall be finished smooth to minimum 220 grit or maximum roughness average (R a) value 0.48 
μm to provide a sanitary finish. The can surface including the taper neck portion should be wrinkle free. There 
shall not be any sharp corner.  
6.6.7  Heat treatment and passivation  
The can shall be heat treated to relieve the stress developed du ring deep drawing and spinning. Thereafter 
complete surface shall be passivated with standard passivation solution to enhance corrosion resistance to 
base material and welded surfaces.  
6.6.8  Hardness  
The 20 l, 30 l, 40 l and 50 l cans shall have minimum hardness (Brinell hardness) of 200 BH for body and 150 
BH for bottom when tested as per ISO 6506 -1. 5 and 10 l capacity can shall have minimum hardness of 150 
BH when tested as per ISO 6506 -1 
7 Tests  
7.1 Pressure check for leakage/bulging  
The cans when immersed i n water and subjected to internal air pressure of 70 kPa for  five minutes shall show 
no signs of leakage or any other damage during or after the test.  
7.2 Drop test at rated capacity  
The 20  l, 30 l, 40 l and 50 l cans (not applicable for 5  l and 10 l capacity can) filled to rated capacity with water 
and with lid on shall be held in a vertical position and dropped once vertically from a height of 125  cm on a 
horizontal hard concrete floor or steel surface. The cans shall neither show any leakage n or suffer from any 
damage other than denting. The bottom ring shall neither partially nor fully detach from the body of the can.  
7.3 Hardness test  
Hardness test shall be carried out following procedures given in  ISO 6506 -1. 
7.4 Dye penetration test  
Dye penetration test ( ISO 3452 -1) of all weld joints  shall be carried out to ensure that there are no defects in 
welding. The test surface shall be cleaned to remove any dirt, paint, oil, grease or any loose scale that could 
either keep penetrant out of a defect, or cause irrelevant or false indications. The red dye penetrant shall then 
be app lied to the surface of the item being tested. The penetrant is allowed dwell time of 20 min . to soak into 
any flaws. The excess penetrant is then removed from the surface by solvent remover. After excess penetrant 
has been removed a white developer is a pplied to the sample. Inspection of the test surface shall take place 
after 10  min. to 30 min . of development time. The developer draws out the penetrant from defects onto the 
surface to form a visible indication, commonly known as bleed -out. Any area that bl eeds out indicates the 
location, orientation and possible types of defects on the surface.  
7.5 Leakage test  
The 20  l, 30 l, 40 l and 50 l cans (not applicable for 5  l and 10 l capacity can) when filled with water and 
inverted shall not show any profuse leakage through  lids. DUS 1867: 201 8 
© UNBS 2018 – All rights reserved  7 
 8 Marking  
8.1 Each can shall be marked legibly and permanently with at least following particulars:  
a) manufacturer’s name or initial or trademark, if any , 
b) the rated ca pacity of the can in litres,  
c) batch or code number and year of manufacture , 
d) material of construction , stainless steel 304 grade , 
e) capacity mark on inside surface of the can , and  
f) any other markings which may be required by the purchaser and agreed upon between the supplier 
and the purchaser.  
9 Sampling and criteria for conformity  
The method of drawing repres entative samples of the cans and the criteria for conformity shall be as 
prescribed in Annex A.  DUS 1867: 2018  
8 © UNBS 2018 – All rights reserved  
 Annex  A 
(normative)  
 
Sampling of stainless steel milk cans  
A.1 Scale of sampling  
A.1.1  In any consignment, all the cans of the same size, shape and from the sam e batch of manufacture 
shall be grouped together to form a lot.  
A.1.2  Samples shall be tested separately for each lot for ascertaining the conformity of cans to the 
requirements of this specification.  
A.1.3  The number of cans to be selected from the lot sh all depend on the size of the lot and shall be in 
accordance with Table A.1. 
Table A.1 — Scale of sampling and permissible number of defectives  
Number of 
Cans in the Lot  
(N) For Visual, Dimensional Requirement  
and Air Pressure Test  For thickness  and 
other tests  number 
of cans to  be 
selected (n) Number of cans  
to be selected (n)  Permissible 
number  of 
defective cans  
3 to 25  3 0 1 
26 to 100  5 0 1 
101 to 300  8 0 2 
301 to 500  13 1 2 
501 to 1000  20 1 3 
1001 to 3000  32 2 3 
3001 and above  50 3 5 
A.1.4  Thes e cans shall be selected at random from the lot. To ensure the randomness of selection, a 
random number table ( ISO 24153 ) as agreed to between the purchaser and the supplier shall be used. In 
case such a table is not available, the following procedure shal l be used:  
Starting from any can in the lot, count them as 1, 2, 3,..., up  to r and so on in one order, where r is the integral 
part on N/n, N being the number of cans in the lot and n the number of cans to be selected (see Table A.1), 
every r th can thus counted shall be withdrawn to give the required number of cans in the sample.  
A.2 Number of tests and criteria for conformity  
A.2.1 All the cans selected according to Table A.1 shall be first examined for visual and dimensional 
requirements given in  clauses 5 and 6 and then tested for air pressure according to 7.1. 
A.2.2  A can failing to satisfy any of these requirements shall be considered as defective. The lot shall be 
considered to have satisfied these requirements if the number o f defectives found in the sample is less than or 
equal to the corresponding permissible number of defective cans given in Table A .1. DUS 1867: 201 8 
© UNBS 2018 – All rights reserved  9 
 A.2.3  The lot having been found satisfactory in A.2.1 shall be tested for thickness ( Table 2 ) and for tests 
given  in sub-clauses 7.2 to 7.5 . For each of these tests, a sub sample of cans shall be selected according to 
Table A.1. These cans shall be selected from those already tested according to A.2.1 and found satisfactory.  
A.2.4  The lot shall be declared as c onforming to the requirements of the specification if none of the cans 
tested for requirements given in clause 5, 6 and 7  fails to meet the corresponding specification requirements; 
otherwise not.  DUS 1867: 2018  
10 © UNBS 2018 – All rights reserved  
 Bibliography  
[1] FAD 19 (2610) C , stainless  steel milk cans – specification  
[2] ISO 15510:2014 , Stainless steels — Chemical composition  
 WDUS 1867: 2017  
© UNBS 2018 – All rights reserved  11 
 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 govern ed 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 
certification mark scheme of the Uganda Natio nal 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 1867: 201 8   
 
ICS 55.120  
Price based on nn pages  
© UNBS 2018 – All rights reserved