DEAS 866 :2021  
ICS 85.080.99  
 
© EAC 2021                                                                                                                         Second  Edition 2021  
 DRAFT EAST AFRICAN STANDARD  
Paper sacks for packaging of cement — Specification  
EAST AFRICAN COMMUNITY  
 
 
 
 DEAS 866 :2021  
ii © EAC  2021 – All rights reserved  
 Copyright notice  
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Reproduction for sales purposes may be subject to royalty payments or a licensing agreement.  
Violators may be prosecuted . DEAS 866 :2021  
© EAC 2021 – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  2 
4 Types  ................................ ................................ ................................ ................................ ......................  2 
5 Requirements  ................................ ................................ ................................ ................................ .........  2 
5.1 General requirements  ................................ ................................ ................................ ...........................  2 
5.2 Specific requirements  ................................ ................................ ................................ ...........................  2 
6 Packaging  ................................ ................................ ................................ ................................ ...............  3 
6.1 Packaging and labelling ................................ ................................ ................................ ........................  3 
6.2 Labelling  ................................ ................................ ................................ ................................ .................  3 
7 Sampling  ................................ ................................ ................................ ................................ ................  3 
Annex  A (normative)  Requirements the sewing thread  ................................ ................................ ................  4 
A.1 Sewing thread/yarn  ................................ ................................ ................................ ...............................  4 
A.1.1  General  ................................ ................................ ................................ ................................ ...................  4 
A.1.2  Sewing threads made wholly or partly fro m synthetic fibres  ................................ ...........................  4 
A.2 Coefficient of variation of linear density  ................................ ................................ .............................  4 
A.3 Knots ................................ ................................ ................................ ................................ .......................  5 
A.4 Total length  ................................ ................................ ................................ ................................ ............  5 
A.5 Net mass  ................................ ................................ ................................ ................................ .................  5 
A.6 Breaking tenacity  ................................ ................................ ................................ ................................ ... 5 
A.7 Appearance  ................................ ................................ ................................ ................................ ............  5 
A.8 Surface finish  ................................ ................................ ................................ ................................ .........  5 
Annex  B (informative)  Typical examples of paper sacks  ................................ ................................ ..............  6 
Bibliography  ................................ ................................ ................................ ................................ ........................  8 
 
 DEAS 866 :2021  
iv © EAC  2021 – All rights reserved  
 Forewor d 
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 tha t are encountered when goods and services are exchanged 
within the Community will be removed.  
The Community has established an East African Standards Committee  (EASC)  mandated to develop and 
issue East African Standards  (EAS) . The Committee is composed of  representatives of the National 
Standards Bodies in Partner States, together with the representatives from the public and private sector 
organizations  in the community .  
East African Standards are developed through  Technical Committees that are representa tive of key 
stakeholders including government, academia, consumer groups, private sector and other interested parties. 
Draft East African Standards are circulated to stakeholders through the National Standards Bodies in the 
Partner States. The comments rec eived are discussed and incorporated before finalization of standards, in 
accordance with the Principles and procedures for development of East African  Standards.  
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 .  
The committee responsible  for this document is Technical Committee EASC /TC 065, Paper and p aper 
Products.  
Attention is drawn to the possibility that some of the elements of this document may be subject of patent 
rights. EAC shall not be held responsible for identifying any or all such patent rights.  
This second edition cancels and replaces the first edition (EAS 866:2017), which has been technically revised 
The main changes compared to the previous edition are as follows:  
— In Table 1, the tensile strength values in both the machine and cross directions for the different grammages 
were  adjusted  
 
 DRAFT EAST AFRICAN STANDARD  DEAS 866 :2021 
 
© EAC 2021 – All rights reserved  1 
 Paper sacks for  packaging of cement — Specification   
1 Scope   
This D raft East African Standard specifies requirements , sampling and test methods  for valve sewn -gusseted 
and valve -pasted ends paper sacks for packaging of cement  
2 Normative references   
The following docume nts are 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 (includin g any amendments) applies.  
ISO 186, Paper and board — Sampling to determine average quality  
ISO 187, Paper board and pulps — Standard atmosphere for conditioning and testing and procedure for 
monitoring the atmosphere and conditioning of samples    
ISO 287,  Paper and board — Determination of moisture content of a lot — Oven -drying method   
ISO 535, Paper and board — Determination of water absorptiveness — Cobb method   
ISO 536, Paper and board — Determination of grammage   
ISO 1924 -3, Paper and board — Determin ation of tensile properties — Part 3: Constant rate of elongation 
method (100 mm/min)   
ISO 1974, Paper — Determination of tearing resistance — Elmendorf method   
ISO 2060, Textiles — Yarn from packages — Determination of linear density (mass per unit length ) by the 
skein method  
ISO 5079, Textile fibres — Determination of breaking force and elongation at break of individual fibres  
ISO 5636 -3, Paper and board — Determination of air permeance (medium range) — Part 3: Bendtsen method   
ISO 6590 -1, Packaging — Sacks — Vocabulary and types — Part 1: Paper sacks   
ISO 7965 -1, Packaging — Sacks — Drop test — Part 1: Paper sacks   
ISO 8791 -2, Paper and board — Determination of roughness/smoothness (air leak methods) — Part 2:  
Bendtsen method  
ISO 21067 , Packaging — Vocabulary — Part 2: Packaging and the environment terms   
2 © EAC  2021 – All rights reserved  
 3 Terms and definitions   
For the purposes of this standard, the terms and definitions in ISO 6590 -1 and ISO 21067 shall apply . 
4 Types  
4.1 Type 1 shall be valve -sewn -gussetted.  
4.2 Type 2 shall have v alve-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 mark s, slime holes and foreign 
matters.  
5.1.2  The paper sack shall be made of well nested plies of paper with matching stretch level. The 
combination of paper in the sack shall give a total tensile energy absorption (TEA) in sack as specified in 
Table 1.  
5.1.3 The sewing thread used shall meet the requirements specified in Annex A.  
5.1.4  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 wi thin elongation limits of the material in 
order to ensure even distribution between plies.  
5.2 Specific requirements  
5.2.1  When tested in accordance with the methods specified in Table 1, the paper sack shall comply with 
the requirements specified therei n.  
Table 1 — Specific requirements for paper sacks for packaging of cement  
S/No.  Characteristic  
  Requirements for different grammage  Test methoda  
 i.    Grammage, g/m2, ± 5%  70  75  80  90  ISO 536  
 ii.    Moisture content, %, m/m  6 - 8 ISO 287   
 iii.    Tensile strength, kN/m, min., (MD)  4.2  4.2 4.5 5.0   
  
  
  
  
  
  
ISO 1924 -3  
   iv.    Tensile strength, kN/m,min., (CD)  3.0 3.0 3.0  3.2 
 v.    T.E.A, J/m2, min. (MD)  154  165  165  200  
 vi.    T.E.A, J/m2, min. (CD)  156  175  175  203  
    vii. T.E.A index, J/g, min. (MD)  2.26  2.12  2.12  2.27  
    viii. T.E.A index, J/g,,min. (CD)  2.29  2.24  2.24  2.31  
 ix.    Stretch,%, min. (MD)  5.69  5.70  5.70  5.64   
© EAC 2021 – All rights reserved  3 
  x.    Stretch,%, min. (CD)  7.60  7.39  7.39  7.30  
 xi.    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)  
xii.    Tensile index Nm/g, min. (MD)  68  64  60  72  
xiii.    Tensile index, Nm/g, min. (CD)  47  46  43  52  
xiv.    Roughness, average of two sides, 
mL/min., max.  1 600  1 600  1 600  1 600  ISO 8791 -2  
xv.    Porosity, mL/min. (Bendtsen), min..  700  700  700  700  ISO 5636 -3  
xvi.    Tear resistance, mN, min. (MD)  1 020  1 157  1 157  1 294  ISO 1974  
xvii.    Tear resistance, mN, min. (CD)  1 157  1 227  1 108  1 247  ISO 1974   
xviii.    Water absorptiveness, g/m2, max.  30  30  30  30  ISO 535  
a Conditioning shall be done in accordance with ISO 187.  
 
5.2.2  The paper sack shall not burst when teste d in accordance with ISO 7965 -1.  
6 Packaging  
6.1 Packaging and labelling  
Paper sacks shall be shall be packaged in suitable packages that prevent them from damage during 
transportation, storage and normal use.  
6.2 Labelling  
Each paper sack shall be cle arly and indelibly marked with the following particulars:  
a) name and physical address of the manufacturer/supplier and/or registered trademark;   
b) total balanced T.E.A (Tensile Energy of Absorption);  
c) country of origin or manufacture;  
d) batch/code number (opt ional); and  
e) type.  
7 Sampling  
Sampling shall be done in accordance with ISO 186.   
4 © EAC  2021 – All rights reserved  
 Annex  A 
(normative)  
 
Requirements the sewing thread  
A.1 Sewing thread/yarn  
A.1.1  General  
The thread/yarn shall be evenly spun with suitable number of turns per metre so th at a balanced thread is 
produced.  
The thread/yarn 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.1.2  Sewing threads made wholly or partly from synthetic fibres  
A.1.2.1  Type of sewing thread   
The type of sewing thread/yarn shall be as declared. In the case of blends, the blend composition shall be as 
declared subject to a tolerance of ± 5 %.  
A.1.2.2  Nominal linear density   
The nominal density ( resultant) of the sewing thread/yarn in text shall be as declared, subject to a tolerance of 
± 4 %. This shall be determined in accordance with ISO 2060.  
A.1.2.3  Resultant linear density   
The resultant linear density of the sewing thread/yarn in text sha ll be as declared subject to a tolerance of ± 2 
% for continuous filament threads and ± 4 % for spun and plied threads.  
A.2 Coefficient of variation of linear density   
The coefficient of variation of the resultant linear density shall not exceed 2 % for continuous filament threads 
and 5 % for spun plied threads. The coefficient of variation (C.V.) shall be calculated from the following 
formula:  
 
 
Where;  
x is the resultant linear density in tex of any thread sample;  
 is the mean resultant linear densit y of all the samples;   
© EAC 2021 – All rights reserved  5 
  n is the total number of samples; and   
is the standard deviation in tex  
A.3 Knots  
The number of knots permissible in a package of sewing thread shall be as specified in Table 1.  
TableA.1 — Number of permissible knots  in a package  
S/No  Package length, m  Permissible knots  
 i.    Up to 1 000   not more than 1  
 ii.    More than 1 000 but not exceeding 2 500   not more than 2  
 iii.    More than 2 500 but not exceeding 4 000   not more than 3  
 iv.    More than 4 000  but not exceeding 5 500   not more than 4  
 v.    More than 5 500 but not exceeding 7 000   not more than 5  
 vi.    More than 7 000 but not exceeding 8 500   not more than 6  
vii.    More than 8 500   not more than 7  
A.4 Total length  
The total length o f sewing thread contained in a package shall be as declared subject to a tolerance of – 0.2 
%.  
A.5 Net mass  
The net mass of thread on a package shall be as declared subject to tolerance of - 0.2 %. Mass shall be the 
total mass of the absolute dry mass pl us official regime.  
A.6 Breaking tenacity  
The minimum breaking tenacity of the sewing thread shall be 20 cN per tex. This shall be determined in 
accordance with ISO 5079.  
A.7 Appearance   
When visually examined, the thread shall have a uniform shade or whiteness and shall be devoid of singeing 
defects and stains.  
A.8 Surface finish  
The threads shall be well lubricated to ensure efficient working on the appropriate types of sewing machines.   
6 © EAC  2021 – All rights reserved  
 Annex  B 
(informative)  
 
Typical examples of paper sacks  
A.1  The typical types of paper sacks are shown in Figure A.1 and Figure A.2.  
  
Figure A.1 — Multi -paper sacks for packaging 50 -kg cement (sewn type)    
© EAC 2021 – All rights reserved  7 
 
  
Figure A.2 — Paper sacks for packaging 50 -kg cement (valve pasted end type)   
  
8 © EAC  2021 – All rights reserved  
 Bibliography  
KS 2497:2013 , Mul ti-wall paper sacks for packaging of cement - Specification  
 DEAS 866 :2021    
 
© EAC 2021  – All rights reserved