FINAL DRAFT UGANDA 
STANDARD  
  FDUS EAS 11 
First  Edition  
2013-mm-dd 
 
 Reference number  
FDUS EAS 11: 2013 
© UNBS 201 3 
  
Galvanized plain and corrugated steel sheets — Specification  
 FDUS EAS 11: 2013 
ii                © UNBS  2013 - 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. User s are 
responsible for its correct application  
© UNBS 20 13 
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 
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 41 505 995  
Fax: 256 41 286 123  
E-mail: unbs@infocom.co.ug  
Web: www.unbs.go.ug  
 FDUS EAS 11: 2013 
© UNBS  2013 - All rights reserved                 iii National foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Tourism, Trade and 
Industry established under Cap 327, of the Laws of Ugan da. 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/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 repres entatives 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 Final Draft Uganda Standard, FDUS EAS 11: 2013, Galvanized plain and corrugated steel sheets — 
Specification , is identical with  and has been reproduced from an East African  Standard , EAS 11: 2013 , 
Galvanized plain and corrugated steel sheets — 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 11 : 2013  
ICS 77.140.20  
© EA C 2013                                                                                                                          Second  Edition 2013   
 FINAL DRAFT EAST AFRICAN STANDARD  
Galvanized plain and corrugated steel sheets — Specification  
EAST AFRICAN COMMUNITY  FDEAS 11: 2013  
ii © EAC 2013  – All rights reserved  
 Copyright notice  
This EAC document is copyright -protected by EAC. While the reproduction of this document by 
participants in the EAC standards development process is permitted without prior permission from EAC, 
neither this document nor any extract from it may be reproduced, stored or transmit ted in any form for 
any other purpose without prior written permission from EAC.  
Requests for permission to reproduce this document for the purpose of selling it should be addressed 
as shown below or to EAC’s member body in the country of the requester:  
© East African Community  2013  — All rights reserved  
East African Community   
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Reproduction for sales purposes may be subject to  royalty payments or a licensing agreement.  
Violators may be persecuted . FDEAS 11 : 2013  
© EAC 2013  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ .............................  v 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Requirements  ................................ ................................ ................................ ................................ .........  2 
4.1 Dimensions  ................................ ................................ ................................ ................................ ............  2 
4.1.1  Length  ................................ ................................ ................................ ................................ .....................  2 
4.1.2  Width  ................................ ................................ ................................ ................................ .......................  2 
4.1.4  Squareness  ................................ ................................ ................................ ................................ ............  3 
4.2 Profile ................................ ................................ ................................ ................................ ......................  3 
4.2.1  Depth ................................ ................................ ................................ ................................ .......................  3 
4.2.2  Pitch  ................................ ................................ ................................ ................................ ........................  3 
4.3 Tensile strength  ................................ ................................ ................................ ................................ ..... 3 
4.4 Resistance to bending  ................................ ................................ ................................ ..........................  3 
4.5 Freedom from defects  ................................ ................................ ................................ ...........................  3 
4.6 Finish  ................................ ................................ ................................ ................................ ......................  3 
5 Galvanized process (criteria of compliance)  ................................ ................................ ......................  4 
5.1 General requirement  ................................ ................................ ................................ .............................  4 
5.2 Zinc coating  ................................ ................................ ................................ ................................ ...........  4 
5.3 Classification of zinc coating  ................................ ................................ ................................ ...............  4 
6 Marking  ................................ ................................ ................................ ................................ ...................  4 
6.1 Complying sheets  ................................ ................................ ................................ ................................ .. 4 
6.2 Non-complying sheets  ................................ ................................ ................................ ..........................  5 
7 Sampling  ................................ ................................ ................................ ................................ ................  5 
7.1 General  ................................ ................................ ................................ ................................ ...................  5 
7.2 Sample for inspection and dimensional test  ................................ ................................ ......................  5 
7.3 Sample for other tests ................................ ................................ ................................ ...........................  5 
8 Testing for zinc coating  ................................ ................................ ................................ ........................  5 
8.1 Mass of zinc coating  ................................ ................................ ................................ .............................  5 
8.1.1  Weight Method  ................................ ................................ ................................ ................................ ....... 5 
8.1.2  Antimony chloride Method  ................................ ................................ ................................ ...................  6 
8.1.3  Calculation  ................................ ................................ ................................ ................................ .............  6 
8.2 Coating adherence test  ................................ ................................ ................................ .........................  6 
9 Inspection and physical tests  ................................ ................................ ................................ ..............  6 
9.1 Inspection  ................................ ................................ ................................ ................................ ...............  6 
9.2 Dimensions  ................................ ................................ ................................ ................................ ............  6 
9.2.1  Thicknes s ................................ ................................ ................................ ................................ ...............  6 
9.2.2  Length  ................................ ................................ ................................ ................................ .....................  6 
9.2.3  Squareness  ................................ ................................ ................................ ................................ ............  6 
9.2.4  Width  ................................ ................................ ................................ ................................ .......................  6 
9.2.5  Pitch  ................................ ................................ ................................ ................................ ........................  7 
9.2.6  Depth of corrugations  ................................ ................................ ................................ ...........................  7 
9.2.7  Tensile strength  ................................ ................................ ................................ ................................ ..... 7 
9.2.8  Bend test and coating adherence test  ................................ ................................ ................................  7 
Annex  A (normative)  Reference method for determination of the zinc coating mass  ...............................  8 
A.1 Principle  ................................ ................................ ................................ ................................ .................  8 
A.2 Reagents  ................................ ................................ ................................ ................................ ................  8 
A.3 Apparatus  ................................ ................................ ................................ ................................ ...............  8 
A.4 Procedure  ................................ ................................ ................................ ................................ ...............  8 FDEAS 11: 2013  
iv © EAC 2013  – All rights reserved  
 A.5 Calculation  ................................ ................................ ................................ ................................ .............. 8 
 
 FDEAS 11 : 2013  
© EAC 2013  – All rights reserved  v 
 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 esta blished 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 t he 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 11 was prepared by Technical Committee EASC/TC 035, Steel and steel products  . 
This second  edition cancels and replaces the first edition (EAS  11:2008 ),  which has been technically revised.  
 
 FINAL DRAFT EAST AFRICAN STANDARD  FDEAS 11 : 2013  
 
© EAC 2013  – All rights reserved  1 
 Galvanized plain and corrugated steel sheets — Specification  
1 Scope  
This Final Draft East African Standard specifies requirements  and methods of sampling and test  for 
galvanized plain and corrugated steel sheets for roofing, cladding, fencing, fabrication and general use.  
This Final Draft East African Standard does not cover special purpose profiles.  
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.  
FDEAS 196 , High strength low -alloy carbon steel for hot rolled sheet and cold rolled sheet ― specification  
3 Terms and definitions  
For the purposes of this standard, the following terms and definitions shall apply.  
3.1 
galvanized sheets  
steel sheets with a uniform coating of zinc applied by the hot -dip process  
3.2 
corrugated sheets  
galvanized steel sheets which are mechanically formed to obtain regular, sinusoidal, profiles, as shown in 
Figure 1  
 
 
Figure 1 — Profile of corrugated sheets  
 
3.3  
thickness  
thickness of the base metal  
FDEAS 11: 2013  
2 © EAC 2013  – All rights reserved  
 3.4  
plain  
flat or even sheets without any relief forms  
3.5  
pitch  
distance between two corresponding and consecutive points on the corrugated steel sheets along its width  
4 Requirements  
4.1 Dimensions  
4.1.1 Length  
When measured in accordance with 9.2.2, the length of sheets shall be as specified in Table 1. 
Table 1 — Nominal length of plain and corrugated sheets  
Dimensions in millimetres  
Nominal length, (+0.5 %, - 0 %) 
mm  
Plain sheets  Corrugated sheets  
2 000  2 000  
2 500  2 500  
3 000  3 000  
 
4.1.2 Width  
The width of plain and corrugated galvanized sheets when measured in accordance with 9.2.4, shall be as 
specified in Table 2.  
Table 2 — Nominal width of plain and corrugated sheets  
Dimensions in millimetres  
Width of plain sheets and sheets 
before corrugation ± 2.5 % Number of corrugations  Total corrugated width ± 2.5 %  
1220  14 1100  
1150  13 1025  
1070  12 950 
1000  11 875 
914 10 800 
 
4.1.3 Thickness  
The thickness of galvanized plain and corrugated sheets shall be expressed in gauges. The corresponding 
thickness in millimetres shall be as specified in Table 3. FDEAS 11 : 2013  
© EAC 2013  – All rights reserved  3 
 Table 3 — Base metal thickness of plain and corrugated sheets  
Gauge  Thickness,  
mm Tolerance (± %)  
32 0.20 12 
30 0.25 10 
28 0.32 10 
26 0.40 10 
24 0.50 10 
22 0.63 10 
20 0.80 5 
18 1.00 5 
16 1.20 5 
14 1.50 5 
12 2.00 5 
10 2.60 5 
 
4.1.4 Squareness  
When measured in accordance with 9.2.3, the distance between diagonally opposite corners of the sheet shall 
not differ by more than 10 mm.  
4.2 Profile  
4.2.1 Depth  
The depth of corrugations shall be 18 mm ±  1.5 mm, when measured in accordance with 9.2.6. 
4.2.2 Pitch  
The pitch of the corrugations shall be 76 mm ± 2 mm when measured in accordance with 9.2.5. 
4.3 Tensile strength  
The tensile strength of plain and corrugated galvanized sheets when determined in accordance with 9.2.7 
shall be not less than 300  N/mm2. The y ield strength shall be not less than 210 N/mm2. 
4.4 Resistance to bending  
When tested in accordance with 9.2.8, the sheet shall not crack, flatter or splinter.  
4.5 Freedom from defects  
The sheets shall be uniform, clean and free from defects that would adversely affect their use . 
4.6 Finish  
The finish on plain and corrugated galvanized sheets shall be “Mill Finish ”. FDEAS 11: 2013  
4 © EAC 2013  – All rights reserved  
 5 Galvanized process (criteria of compliance)  
5.1 General requirement  
The steel sheets shall be manufactured in accordance with accepted current practice and shall be from rolled 
milled steel made by a suitable process and meeting the requirements of EAS 196 . The sheets shall be true to 
size and homogenous, with no trace of discontinuity of the zinc coating. They shall also be free from holes, 
tears, twists, cambers and damaged edges and corners. Corrugations shall be parallel to the edges of the 
sheets.  
5.2 Zinc coating  
5.2.1 Zinc coating shall be carried out by the hot -dip process with smelter containing not less than 98.5 % 
pure zinc. The minimum mass of zinc coating on the two sides of sheet and the corresponding thickness of 
zinc coating on each side shall comply with the classification specified in  Table 4.  
Table 4 — Classification of galvanized plain and corrugated steel sheet  
Coating 
class  Nominal 
mass on two 
sides,  
g/m2 Minimum mass 
on two sides by 
Weight Method , 
g/m2 Minimum mass 
on two sides by 
Antimony 
chloride Method , 
g/m2 Nominal 
corresponding 
thickness on 
each side,  
µm Minimum 
corresponding 
thickness on 
each side ,  
µm 
Z 515 412 360 35 25 
Y 450 360 315 31 22 
X 387 310 270 26 19 
A 305 244 214 21 15 
B 244 198 183 17 13 
C 214 172 146 15 10 
D 183 137 122 13 9 
 
5.2.2 The nominal mass of zinc coating per square metre, when tested according to methods specified in 
8.1, shall correspond to the classification specified in Table 4. The minimum values determined by the 
methods specified in 8.1, shall be as shown in Table 4.  
5.2.3 Zinc coating adherence shall be such that there shall be no flaking or splintering in the finished 
galvanized plain or corrugated sheet, when tested in accordance with  8.2. 
5.3 Classification of zinc coating  
Galvanized plain and corrugated steel sheets shall be classified into seven (7) classes depending on the mass 
of zinc coating applied to meet different service and environmental conditions. The classes shall be as 
specified in Table 4.  
6 Marking  
6.1 Complying sheets  
Each galvanized plain or co rrugated steel sheet complying with this standard shall be permanently and 
indelibly marked with the following  information : FDEAS 11 : 2013  
© EAC 2013  – All rights reserved  5 
 a) manufa cturer's name and/or trade mark;  
b) thickness ; 
c) coating class of sheet ; and  
d) batch identification.  
6.2 Non-complying sheets  
All non-complying sheets shall be identified by cutting off all four corners at least  by 75  mm along the edges 
diagonally  and shall be marked “Rejected” with indelible ink . 
7 Sampling  
7.1 General  
The sampling procedure s in 7.2 and 7.3 shall be applied in determining whether a lot complies with the 
relevant requirements of the specification.  
The samples so taken shall be deemed to represent the  lot. 
7.2 Sample for inspection and dimensional test  
7.2.1 From the lot , random sampling shall be done in accordance with Table 5.  
Table 5 — Sampling plan  
Number of sheets  Sample for inspection and dimensional tests,  
number of sheets  
1 - 16 1 
17 - 48 2 
49 - 100 3 
101 - 160 4 
161 - 200 5 
> 200 5 per 200 sheets  
 
7.2.2 For the manufacturing industry, three sheets shall be taken in every 8 h shift.  
7.3 Sample for other tests  
From the sample taken in accordance with 7.2.1, take at random one sheet.  
8 Testing for zinc coating  
8.1 Mass of zinc coating  
8.1.1 Weight Method  
The steel sheets shall be weighed before galvanizing then passed through the galvanizing process and 
weighed again at the end of the process.  
NOTE  The Antimony chloride Method will be used as the criteria for compliance and not the Weight Method . FDEAS 11: 2013  
6 © EAC 2013  – All rights reserved  
 8.1.2 Antimony chloride Method  
The test piece of minimum area 5 000 mm2 shall be weighed and then introduced into a zinc -stripping solution 
of one part antimony chloride and twenty parts hydrochloric acid (specific gravity 1.19), and shall remain 
therein until the coating has completely dissolved. The test piece shall be take n out of the solution when the 
violent chemical reaction ceases, rinsed in running water, brushed to remove any loose substance, dried and 
weighed.  
8.1.3 Calculation  
The average of the gain or loss in mass ( grams ) calculated from the results obtained from three  test pieces 
shall represent the mass of zinc coating on both sides of each test piece (see Annex A).  
The results shall be expressed in grams per square metre ( g/m2). 
8.2 Coating adherence test  
8.2.1 The test shall consist of subjecting the test piece  to deformation by bending in one direction. The test 
piece shall either be bent mechanically or gripped in hand -operated device (mandrels may also be used) and 
bent until the two legs of the test piece are parallel to each other, that is ,  through 180°.  
8.2.2 A second test piece shall be bent in the opposite direction.  
8.2.3 The sheets shall be bent round a diameter of 38 mm.  
9 Inspection and physical tests  
9.1 Inspection  
Inspect the sample taken in accordance with  Clause 7 for compliance with 4.5 and 6.1. 
9.2 Dimensions  
9.2.1 Thickness  
Measure to the nearest 0.01 mm the thickness of each sheet in the sample of the sheets at any point at least 
10 mm from an edge and end of the sheet.  
9.2.2 Length  
Place each sheet in the sample in turn on a flat rigid surface. Measure to the nearest 1 mm the length of each 
sheet along the centre line of the sheet.  
9.2.3 Squareness  
Place each sheet in the sample in turn on a flat rigid surface. Measure to the nearest 1 mm the distance 
between the diagonally opposite corners of each sheet and record to the nearest m illimetre  the difference 
between the two measurements.  
9.2.4 Width  
9.2.4.1  Plain sheets  
Place each sheet in the sample in turn on a rigid surface. Measure to the nearest 1 mm across the width of 
the sheet.  FDEAS 11 : 2013  
© EAC 2013  – All rights reserved  7 
 9.2.4.2  Corrugated sheets  
Place each of the sheets in the sample in turn on a flat rigid surface and measure , to the nearest 1 mm across 
the width of the sheet. Choose at random a cross -section of the sheet and if, because of the springy nature of 
the sheet , the underside of the downwards corrugations or troughs are not all in contact with the supporting 
surface, apply sufficient pressure to the upper surface of the sheet to bring the lower surface into full contact 
with the supporting surface. Ensure that t he application of pressure causes no deformation of the sheet other 
than that needed to bring the corrugations into contact with the rigid surface.  
Place the width gauge appropriate to the type of sheet being tested across the sheet at any chosen cross -
section and at right angle to the sides of the sheet and adjust the gauge to fit firmly over the outermost 
corrugations. Determine whether the width of the sheet complies with the requirements of Table 2. Both edges 
of the corrugated sheet shall be turned upw ards while measuring.  
9.2.5 Pitch  
With the sheet in contact with a flat surface, place a transparent graduated rule on edge across the sheet so 
that it rests perpendicularly on the crests of two adjoining corrugations far from the points of contact, and re ad 
the distance between them to the nearest 1 mm. Repeat the process to improve your results by taking the 
average of five readings for the distance between several crests.  
NOTE  Any other appropriate method may be used to measure the pitch.  
9.2.6 Depth of corrugations  
With the initial rule lying flat across the corrugations at the edge of the sheet, use another graduated rule or 
calipers to measure the perpendicular distance between the initial rule and the rigid support.  
NOTE  Any other appropriate method m ay be used to measure the pitch.  
9.2.7 Tensile strength  
From the sample in Clause 7, prepare a tensile test specimen, after stripping off coating, by cutting a strip 30 
mm x 80 mm, such that the length of the specimen is transverse to the direction or rolling of the sheet. The 
portion of sheet from which the test piece is cut shall be carefully flattened. Determine the tensile strength of 
the specimen.  
If the tensile strength of the test specimen fails the requirements of 4.3, prepare two further test s pecimens 
and determine their tensile strength.  If both specimens comply with the requirements,  discard the results of 
the first specimen, but if either of the additional specimens fails to meet the requirements, deem the sheet and 
the lot to be defective.  
9.2.8 Bend test and coating adherence test  
A test specimen shall be selected in accordance with Clause 7 and shall be prepared to measure 10 mm in 
width and 120 mm in length.  
It shall be cut with its length transverse to the direction of rolling of the sh eet. Carefully bend the strip round a 
drum of diameter 38 mm (mandrels may also be used) until the edges of the specimen are approximately 
semi -circular.  
If the specimen cracks, prepare and test two further specimens in the same way. If both these test spe cimens 
comply with the requirements of 4.4, 4.5 and 5.2.3, discard the results obtained on the first specimen, but if 
either of the two cracks at the bend, deem the sheet and lot to be defective.  
 FDEAS 11: 2013  
8 © EAC 2013  – All rights reserved  
 Annex  A 
(normative)  
 
Reference method for determination of the zinc coating mass  
A.1 Principle  
Using a specimen with a surface area of at least 5 000 mm2, the loss of mass in grams when the coating is 
dissolved, multiplied by 200, will represent the coating mass in grams per square metre of the product (for 
both sides).  
To verify the mass of coating, three specimens shall be cut and tested, one from the mid -width position and 
one from each side, no closer than 25 mm from the side edge of a sample piece approximately 300 mm in 
length on the coated width.  
A.2 Reagen ts   
A.2.1  Hydrochloric acid  (HCl = 1.19 g/cm3)  
A.2.2  Antimony tri -chloride  
A.3 Apparatus  
Balance , capable of weighing samples to an accuracy of 0.01 g. For the test, use a take -off device.  
A.4 Procedure  
A.4.1  If necessary, degrease the sample with an organic solvent, which will not attack the coating, then dry 
the sample . 
A.4.2  Weigh the sample to an accuracy of 0.01 g . 
A.4.3  Place the sample in the hydrochloric acid solution with hexamethylenetetramine or antimony chloride 
inhibitor at an ambient temp erature of 20 °C to 25 °C leave the sample immersed in the solution until the 
release of hydrogen ceases of only a few bubbles are released . 
A.4.4  After the attack, wash the sample and brush under running water, dry with a cloth and then by heating 
to arou nd 100  °C and cool or dry by blowing with warm air . 
A.4.5  Weigh the sample again to an accuracy of 0.01  g. 
A.4.6  Determine the difference between the mass of the coated sample and that of the sample without its 
coating. This difference, calculated in grams , represents the mass of the coating.  
NOTE  The operations  in A.4.1 – A.4.6  are applied to each sample.  
A.5 Calculation   
The coating weight shall be obtained from the following formulas. Method 1 shall be the reference method in 
case of a dispute . 
Method 1 shall be used for regular pieces of specimen (either square or rectangular). In case where it's 
difficult to cut regular test pieces, for example, the heavier sheet gauges, method 2 shall be used.  FDEAS 11 : 2013  
© EAC 2013  – All rights reserved  9 
 Method 1  
6 2 1
1 10AWWC
 (1) 
 
Method 2  
7850
22 1
2  tWWWC
 (2) 
 
where  
 
C is zinc coating in grams per square metre ( g/m2); 
A is area of test specimen (length x width);  
W1 is weight , in grams,  of test piece before stripping;  
W2 is weight , in grams,  of test piece after stripping (base metal);  
t is thickness , in millimetres,  of test piece after stripping (base metal);   
106 is conversion factor ; and 
7850  is density of steel in kilograms per cubic metre (kg/m3). 
: FDEAS 11:2013    
 
© EAC 2013  – All rights reserved