DRAFT UGANDA STANDARD DRAFT UGANDA STANDARD  
  DUS DEAS 866 
First  Edition  
2015-mm-dd 
 
 Reference nu mber  
DUS DEAS 866: 2015 
© UNBS 201 5 
  
Multi-wall paper sacks for packaging of cement — Specification  
 DRAFT UGANDA STANDARDDUS DEAS 866:2015 
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 
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  
 DRAFT UGANDA STANDARDDUS DEAS 866:2015 
© 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 DEAS 866: 2015, Multi-wall paper sacks for packaging of cement — 
Specification , is identical with  and has been reproduced from an East African  Standard , DEAS 866: 2015, 
Multi -wall paper sacks for packaging of cement — 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." 
 
  DRAFT UGANDA STANDARDDEAS 866:2015 
ICS  
© EAS 2014                                                                                                                         First Edition 2014  
 
DRAFT EAST AFRICAN STANDARD 
 
 
 
Multi-wall paper sacks for packaging of cement — Specification 
 
 
 
 
 
 
 
 
 
EAST AFRICAN COMMUNITY DRAFT UGANDA STANDARDDEAS 866:2015 
© EAC 2014  – All rights reserved  ii 
 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 transmitted 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  
P.O.Box 1096 
Arusha 
Tanzania 
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Fax: 255 27 2504481/2504255 
E-mail: eac@eachq.org 
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Reproduction for sales purposes may be subject to royalty payments or a 
licensing agreement. Violators may be persecuted DRAFT UGANDA STANDARDDEAS 866:2015 
© EAC 2014  – 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.  
This Draft East African Standard, DEAS.  CD/K/14:2014 ., was prepared by Technical Committee 
EASC //TC/065 Paper and paper products ., The Committee is composed of representatives from National 
Standards Bodies, regulators and academia, together with the representatives from the private sector and 
consumer organizations in Partner States.  
 DRAFT UGANDA STANDARDDRAFT EAST AFRICAN STANDARD  DEAS 866:2015  
 
© EAC 2014  – All rights reserved  1 
 Multi-wall paper sacks for packaging of cement — Specification 
1 Scope 
This East African Standard specifies requirements, sampling and test methods for valve sewn -gusseted and 
valve -pasted ends multi -wall paper sacks intended for packaging of cement.  
2 Normative references 
The following documents are indispensable for the application of this standard: For dated references, only the 
edition cited applies. For undated references, the latest edition of the referenced document (including any 
amendments) applies: 
ISO 287, Paper and board — Determination of moisture content of a lot — Oven-drying method 
ISO 536, Paper and board — Determination of grammage 
ISO 1 924-2, Paper and board -- Determination of tensile properties -- Part 2: Constant rate of elongation 
method (20 mm/min)  
ISO 5636,  Paper and board -- Determination of air permeance (medium range)  
ISO 6590- 1, Packaging — Sacks — Vocabulary and types Part 1: Paper sacks  
ISO 7965-1, Packaging — Sacks — Drop test Part 1: Paper sacks 
ISO 535, Paper and board -- Determination of water absorptiveness -- Cobb method 
ISO 1974:2012, Paper -- Determination of tearing resistance -- Elmendorf method 
ISO 8791-2:2013, Paper and board -- Determination of roughness/smoothness (air leak methods) -- Part 2: 
Bendtsen method 
ISO 5079:1995, Textile fibres -- Determination of breaking force and elongation at break of individual fibres 
ISO 2060:1994, Textiles -- Yarn from packages -- Determination of linear density (mass per unit length) by the 
skein method 
 
3 Definitions 
 
For the purposes of this standard, the definitions contained in ISO 21067 shall apply. 
4 Types 
4.1 Type 1 
Shall be valve-sewn-gussetted. DRAFT UGANDA STANDARDDEAS 866:2015 
© EAC 2014  – All rights reserved  2 
 4.2 Type 2 
Shall have valve-pasted ends. 
5 Requirements 
5.1 General requirements 
5.1.1  The paper shall be free from defects, which may adversely affect its serviceability. It shall be free from 
wrinkles, folds, paper dust, tears which have not been glued, stains, prominent marks, slime holes and foreign 
matters. 
5.1.2. The material of construction shall either be extensible or semi extensible sack Kraft or creped paper 
or a combination of these. Combination of sack Kraft and extensible Kraft paper is in not recommended. 
5.1.3  The sewing thread used shall meet the requirements specified in Annex A  
5.1.4  Construction: The sack shall be made of three or more well nested plies of paper specified in 5.1.2. 
The combination of the paper in the sack gives a total minimum tensile energy of absorption (TEA). 
5.4 physical requirements 
When tested in accordance with the methods specified in Table 1, the paper shall comply with the 
requirements specified therein. 
Table 1 — Chemical and physical requirements of crimped and extensible sack Kraft paper for 
packaging of cement 
SL No.  Characteristics  
 Requirements for different grammage  Test method  
i.  Grammage, g/m2, ± 5%  70 75 80 90 ISO 536  
ii.  Moisture content, (%)  6-8 6-8 6-8 6-8 ISO 287  
iii.  Tensile strength, kN/m, min., 
(MD)  4.78 4.80 4.80 6.44 ISO 1924 -2 
iv.  Tensile strength, kN/m,min., (CD)  3.27 3.44 3.44 4.64 ISO 1924 -2 
v.  T.E.A, j/m2, (MD) 154 165 165 200 ISO 1924 -2 
vi.  T.E.A, j/m2, (CD) 156 175 175 203 ISO 1924 -2 
vii.  T.E.A index, j/g, (MD) 2.26 2.12 2.12 2.27 ISO 1924 -2 
viii.  T.E.A index, j/g, (CD) 2.29 2.24 2.24 2.31 ISO 1924 -2 
ix.  Stretch,%, (MD)  5.69 5.70 5.70 5.64 ISO 1924 -2 
x.  Stretch,%, (CD)  7.60 7.39 7.39 7.30 ISO 1924 -2 
xi.  Roughness, average of two sides 
mL/min., max.  1 600  1 600  1 600  1 600  ISO 8791 -2 
xii.  Porosity ,mL/min (Bendtsen)  700 700 700 500 ISO 5636  
xiii.  Total balanced T.E.A, j/m2, min.  466(3 -ply) 
621(4 -ply) 514(3 -ply) 
683(4 -ply 514(3 -ply) 
683(4 -ply 402(2 -ply) 
606(3 -ply) 
807(4 -ply ISO 1924 -2 
xiv.  Tear resistance, mN, minimum, 
(MD)  1 020  1 157  1 157  1 294  ISO 1974  
xv.  Tensile Index Nm/g (MD)  68 64 60 72 ISO 1924  DRAFT UGANDA STANDARDDEAS 866:2015 
© EAC 2014  – All rights reserved  3 
 xvi.  Tensile Index Nm/g (CD)  47 46 43 52 ISO 1924  
xvii.  Tear resistance, mN, minimum, 
(CD)  1 157  1 227  1 108  1 247  ISO 1974  
xviii.  Cobb g/m2 max 30 30 30 30 ISO 535  
Sometimes Tensile strength is not achievable as per the requirements in 
the table well as the T.E.A is spot on.   
5.5 Shape and dimensions 
5.5.1  The sack shall be either the valve-sewn-gussetted type or valve-pasted ends type. 
5.5.2  The typical type of paper sacks are shown in Figures 1 and 2. 
 
 
Fig: 1 
Figure 1 — Multi -paper sacks for packaging 50 kg cement (sewn type)  
 Comment [U1]: It is a point of  concern by one 
of the manufactures that T.E.A is the critical 
parameter to be considered  for conformance 
not the entire table, subject to public review  DRAFT UGANDA STANDARDDEAS 866:2015 
© EAC 2014  – All rights reserved  4 
  
 
Fig: 2 
 
5.5.3  The sack shall be suitably perforated for escape of air. There shall be 9 — 12 stitches per 10 cm 
length of stitching in valved sewn-gussetted sacks. 
5.6 Workmanship 
5.6.1  The plies shall be properly but not excessively creased.  
5.6.2  In the construction of the sack tube, the outer ply fit shall be such that at the point of manufacture, 
each ply shall be smaller in circumference than the next outer ply within elongation limits of the material in 
order to ensure even distribution between plies.  
5.6.3  Care shall be taken to ensure adequate longitudinal overlap, equal gusset formation and spot gluing 
quantity and line gluing.  
5.7 Drop test 
When tested in accordance to ISO 7965 -1, a lot of 5 sacks is considered to have passed if not more than one 
sack shows failure in bursting leading to seepage.  
6 Packaging  
6.1 Packaging 
The paper sacks shall be packed appropriate packages that shall prevent damage and deterioration of its 
quality during transportation or storage.  
Figure 2 — Multi -paper sacks for packaging 50 kg cement (valve pasted end       
type)  DRAFT UGANDA STANDARDDEAS 866:2015 
© EAC 2014  – All rights reserved  5 
 6.2 Labelling 
Each paper sack shall be clearly and indelibly marked with the following particulars: 
a) name and physical address of the manufacturer/supplier;  
b) registered trademark  
c) total balanced T.E.A (Tensile Energy of Absorption); 
d) country of origin or manufacture; 
e) net mass of the contents; 
f) the words ―Do not use hooks‖, preferably showing the pictorial illustration;  
g) batch number; 
h) type. 
 
 DRAFT UGANDA STANDARDDEAS 866:2015 
© EAC 2014  – All rights reserved  6 
 Annex A 
(normative) 
 
Requirements the sewing thread 
 
A.1 Cotton sewing thread — Yarn  — The thread shall be manufactured from 100 per cent cotton yarns.  
The yarns shall be evenly spun with suitable number of turns per metre so that a balanced thread is 
produced.  
A.2 Cotton sewing thread — Sewing Threads — The thread shall be singled and shall have uniformity 
of thickness throughout its length. When visually examined, the threads shall be free from hairiness 
and snarls. 
(a) Sewing threads made wholly or partly from synthetic fibres — Type of Sewing Thread  
— The type of sewing thread shall be as declared. In the case of blends,  the blend 
composition shall be as declared subject to a tolerance of  5 per cent.  
 
A.3 Cotton sewing thread — Nominal Linear Density — The nominal density (resultant) of the sewing 
thread in text shall be as declared, subject   to a tolerance of    4 per cent.  This   shall   be 
determined in accordance   with ISO 2060. 
(a) Sewing threads made wholly or partly from synthetic fibres  — Resultant Linear Density 
— The resultant linear density of the thread in text shall be as declared subject to a tolerance 
of  2 per cent for continuous filament threads and  4 per cent for spun and plied threads. 
A.4 Coefficient of Variation of Linear Density — The coefficient of variation of linear density of the thread 
shall not exceed 2 per cent. 
a) Sewing threads made wholly or partly from synthetic fibres Coefficient of Variation of Linear 
Density  — The coefficient of variation of the resultant linear density shall not exceed 2 per 
cent for continuous filament threads and 5 per cent for spun plied threads.  
 The coefficient of variation (C.V.) shall be calculated from the following formula: 
         C. V.  =   
%100x   
 
   

nxx2  
 where,  
  
x   =   the resultant linear density in tex of any thread sample, DRAFT UGANDA STANDARDDEAS 866:2015 
© EAC 2014  – All rights reserved  7 
 
x  =   the mean resultant linear density of all the samples, 
  
n   =   the total number of samples, and  
    
  =   the standard deviation in tex.   
 
A.5 Knots  — The number of knots permissible in a package of sewing thread shall be as specified in 
Table 1. 
 
TABLE 1. NUMBER OF PERMISSIBLE KNOTS IN A PACKAGE 
PACKAGE LENGTH IN METRES  
 PERMISSIBLE KNOTS  
Upto 1 000  
 not more than 1  
More  than 1 000 but not exceeding 2 500  
 not more than 2  
More than 2 500 but not exceeding 4 000  
 not more than 3  
More than 4 000 but not exceeding 5 500  
 not more than 4  
More than 5 500 but not exceeding 7 000  
 not more than 5  
More than 7 000 but not exceeding 8 500  
 not more than 6  
More than 8 500  
 not more than 7  
 
A.5 Total Length — The  total  length  of  sewing  thread contained in a  package  shall  be  as  declared 
subject to a tolerance of – 0.2 per cent. 
 
A.6 Net Mass — The net  mass of thread  on  a  package  shall  be as  declared  subject  to  tolerance  of  
– 0.2 per cent. 
NOTE:  Mass shall be the total mass of the absolute dry mass plus official regime. 
A.8 Breaking Tenacity  — The minimum breaking tenacity of the sewing thread shall be 20 cN per tex.  
This shall be determined in accordance ISO 5079 
A.9 Appearance — When visually examined, the thread shall have a uniform shade or whiteness and 
shall be devoid of singeing defects and stains. 
 
A.10 Surface Finish — The threads shall be well lubricated to ensure efficient working on the appropriate 
types of sewing machines. DRAFT UGANDA STANDARDDEAS 866:2015 
© EAC 2014  – All rights reserved  8 
  
 
 DRAFT UGANDA STANDARD  
 
© EAC 2014 –  All rights reserved