DEAS 1074 : 2021 
ICS 55.040 
 
© EAC 20 21                                                                                                                          First Edition 20 21 
  DRAFT EAST AFRICAN STANDARD  
Crown closures  — Specification   
EAST AFRICAN COMMUNITY  
 
 
 
 
 
  DEAS 1074 : 2021  
 
ii © EAC 20 21 – All rights reserved  
 Copyright notice  
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© East African Community 2021 — 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 prosecuted . DEAS 1074: 2021  
© EAC 20 21 – 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 sta ndardization, trade barriers that are encountered when goods and services are exchanged 
within the C ommunity 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 representative 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 received are discussed and incorporated before finalization of standards, in 
accordance with the Principles and procedures for develop ment 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 06 6, Packaging . 
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.  
 DRAFT EAST AFRICAN STANDARD  DEAS 1074 :2021 
 
© EAC 20 21 – All rights  reserved  1 
 Crown closures — Specification   
1 Scope  
This Dr aft East African Standard specifies the requirements, sampling and test methods for intermediate 
crown closures used on glass bottles . 
2 Normative references  
The following documents are referred to in the text in such a way that some or all of their conten t 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 11949 , Cold-reduced tinmill products — Electrol ytic tinplate  
ISO 11950 , Cold-reduced tinmill products — Electrolytic chromium/chromium oxide -coated steel  
ISO 15512,  Plastics — Determination of water content  
3 Terms and definitions  
For the purposes of this document, the following terms and definitions  shall apply . 
ISO and IEC maintain terminological databases for use in standardization at the following addresses:  
— IEC Electropedia: available at http://www.electropedia.org/  
— ISO Online browsing platform: avai lable at http://www.iso.org/obp  
3.1 
crown  closures  
metal cap lined with lcork or plastic used for sealing neck bottles  
3.2 
crown shell  
metal cap which is formed from a sheet without a liner  
3.3 
liner  
disc or gasket ma de from cork or PVC plastisol compound or PVC dry blend compound or PVC free dry blend 
compound lined inside the crown shell for sealing purposes  
4 Requirements  
4.1 General requirements  
4.1.1 Workmanship  
4.1.1.1  The cr own shell shall be manufactured from tinplate or tin free steel (TFS).  DEAS 1074 :2021  
2 © EAC 20 21 – All rights reserved  
 4.1.1.2  Standard type cr own shell shall be lined with cork or spun or molded PVC plastisol compound.  
4,1.1. 3 Intermediate  type crown shell shall be  lined with 'spun or moulded PVC  plastisol compound . 
4.1.1. 4 In case of cork  lined standard crown -shell, the cork liner may be faced with a suitable food grade  
spotting  material such as  vinylite aluminium  foil if required.  
4.1.1. 5 The adhesive used for bonding the spotting material to. the cork disc shall be of hot melt t ype and s hall 
be of non -toxic quality . 
4.1.1.6  The liner  shall firmly adhere to the shell so that it cannot be removed easily.  
4.1.1.7  The liner shall; 
a) be free from pits and pinholes or any other defect that may impair its fun ction or serviceability or both;  
b) have n o adverse effect on the food product (e.g. through chemical reactions, leaching of liner 
materials or absorption);  
c) neither be affected by the foodstuff packed nor altered by the ingredients of the food in its final form in 
terms of its properties and prote ctive function;  
d) not result into changes in the organoleptic chara cteristics of the foodstuff ; and 
e) not be manufactured using post -consumer recycled materials.  
4.1.1.8 Internal finish  
The inside surface of t he crown shall be given a suitable protective coati ng of lacquer of non -toxic quality. In 
case of  PVC plastisol lined crowns, an  adhesive type  of lacquer shall be  used. Adhesion between lacquer and 
compound shall be  such that the liner  disc does not fall  or displace from the shell during transportation  or 
during crimping . 
4.1.1. 9 External finish  
The outside surface of the crown shall b e given a protective and decorative finish including print as agreed to. 
between the pu rchaser and the supplier. The finish shall be such that the crowns flow in chutes  of high speed 
bottling machines without frequent interruption.  
4.2 Specific requirements  
4.2.1 Dimensions and tolerances  
4.2.1.1 The standard and intermediate skirt crown shells shall be manufactured to the dimensions and 
tolerances shown in Figure 1 . The overal l height and diameter of the closures shall be ch ecked with gauge 
shown in Figure 2. 
a) Thickness : 0.18 mm to 0.24 mm with E1[2.8/2.8m2] or TFS  
b) Hardness : TH415 to T4(61 ± 5); TH435 to T5 (65 ± 5); TH550 to DR8 (73± 5) on the Rockwell 30T 
scale  
c) Finish metal crown : - Shall be free of  sharp edge and excessive burrs.  
Figure 1 — Dimensions of Standard and intermediate type crown shells  DEAS 1074 :2021  
© EAC 20 21 – All rights  reserved  3 
 Table  1 — Dimensions of Standard and intermediate skirt crown shell  
Type  Height  
mm 
Standard skirt crown shell  6.7 ±0.2 
Intermed iate skirt crown shell  5.95 ±0.2 
 
Figure 2 — Outside diameter and height checking gauge  
 
Table 2 — Outside diameter and height checking gauge  
Type  Diameter  
mm 
A 
GO B 
NO GO  
Standard skirt crown shell  6.89 - 6.87 6.50 - 6.48 
Intermediate skirt crown she ll 6.14 - 6.12 5.75 - 5.73 
 
4.2.2 Boiling test  
The gelatine  composition cork disc, when subjected to a bo ling test in water for 1 h , shall not show any sign of 
disintegration.  
4.2.3 Air pressure test  
When tested in accordance with A nnex A, the crowns shal l not show any leakage below 7.03 kg/cm2 
4.2.4  Performance requirements of crown shell  
The crown shell shall be made from Tin Free Steel (TFS) also known as Electrolytic chromium/chromium 
oxide -coated steel (ECCS) ECCS complying with ISO 11950 or Electroly tic Tinplate complying with ISO 
11949 when tested in accordance with the test methods specified therein.  
4.2.5 Chemical composition  
In addition to the requirements of ISO 11949 and ISO 11950, the steel base type L that is food grade shall 
comply with the c hemical composition  requirements given in Table 3.  
 
Table 3  — Chemical composition of the bas e steel for metallic crown caps  
S/N Element  Cast composition  
%, max.  
i.  Carbon  0.13 
ii.  Manganese  0.60 DEAS 1074 :2021  
4 © EAC 20 21 – All rights reserved  
 iii.  Phosphorus  0.020  
iv.  Sulfur  0.03 
v.  Silicona,b  0.020  
vi.  Coppe r  0.06 
vii.  Nickel  0.04 
viii.  Chromium  0.06 
ix.  Molybdenum  0.05 
x.  Aluminiumc 0.10 
xi.  Other elements, each  0.02 
a When steel produced by the silicon killed method is ordered, the silicon maximum may be 
increased to 0.080 %.  
b When strand cast steel produced by t he alumin ium killed method is ordered or furnished, the 
silicon maximum may be increased to 0.030 % when approved by the purchaser . 
c Types L may be supplied as non -killed or killed, which would respectively be produced 
without and with alumin ium additions .  
4.2.6  Liner  
When t ested in accordance with Annex B  the overall migration limit of the liner constituents shall 
not exceed 60 milligrams per kilogram of the simulant, equivalent to 10 milligrams of total non -
volatile substances released into food simul ant per square decimetre of surface area of the liner.  
4.2.7  Leakage  
Lined crown closures shall be fitted with the liner and shall be well -matched with the bottle they are intended 
to seal. W hen tested in accordance with EAS 354, the lined crown cap shall  not leak, nor allow diffusion and 
permeation.  
4.2.8  Moisture content  
For satisfactory assembly and to avoid excessive sweating in the lined crown caps, the initial moisture content 
in the composite cork shall be 4 % to 6% when tested in accordance with ISO  15512.  
6 Packaging  
The crown closures  shall be packaged in a manner that prevents damage, contamination during handling, 
storage and transportation.  
7 Labelling  
7.1 Labelling on the crown shell  
The crown shell shall be legibly and indel ibly marked with ma nufacturer’s  logo or trade mark and mould 
number . 
7.2 Labelling on bulk package  
Each unit of packaging shall carry the following information  
a) manufacturer name  and address ; DEAS 1074 :2021  
© EAC 20 21 – All rights  reserved  5 
 b) brand identification;  
c) crown type/specification number;  
d) batch number;  
e) date of product ion; 
f) expiry date  
g) number and weight of crown closures in a package;  
h) country of manufacture or origin; and  
i) instructions for use and disposal.  
8 Sampling  
Sampling sha ll be done in accordance with  ISO 2859 -1. DEAS 1074 :2021  
6 © EAC 20 21 – All rights reserved  
 Annex A 
(normative)  
 
Air pressure test  
A.1 Apparat us 
A.1.1  Dummy bottle top , made from mild steel  
A.1.2  Dummy bottle , as shown in F igure A.1  
A.1.3  Pressure gauge  
A.2 Procedure  
A.2.1  Fit the dummy with a non -return air valve and a  pressure gauge  as shown in  Figure A.1. 
A.2.2  The crown closure  shall be crim ped on the dummy and the  uniformity of the sealing shall be 
examined  by using a 'GO' and ‘ NO GO’ ring  gauge as shown in  Figure A.2. A crown closure  found  improperly 
sealed shall not be used for the purpose of this  test. 
A.2.3  Pump air -pressure up to 6.5  kg/cm3 as indicated pressure gauge through a non return air valve. 
Immerse th e bottle in water for 15 s . There shall be no leakage of air.  
 
Figure A.1 — Air pressure test  DEAS 1074 :2021  
© EAC 20 21 – All rights  reserved  7 
 
 
Figure A. 2 —Ring gauge for crimped crown closures  DEAS 1074 :2021  
8 © EAC 20 21 – All rights reserved  
 Annex B 
(normative)  
 
Determination  of overall migration of constituents of liner  
B.1 General  
This Annex specifies the method of analysis for determination of overall migration of constituents of liner. 
B.2 Simulant s and test conditions  
Determination of migration is carried out using the following simulants  at 40 ºC for 10 days : 
a) Simulant ‘A’ – Distilled water or water of equivalent quality.  
b) Simulant ‘C¹’ – 10 % ethanol ( v/v) in aqueous solution for foodstuffs having alcohol less than 10 % (v/v) 
(using the simulant ‘A’)  
B.3 Method  
B.3.1 Apparatus  
B.3.1.1  Electric oven/water bath , equipped with thermostat to maintain the desired temperature within  ± 
1 ºC accuracy  
B.3.1.2  Electric hot plate , with temperature control regulator  
B.3.1.3  Analytical balance , with a sensitivity of 0.1 mg  
B.3.1.4  Glass beakers, Pyrex of 1  000 ml capacity or equivalent  
B.3.1.5  Stainless steel evaporating dish , of 100  ml capacity  
B.3.1.6  Stainless steel tongs  
B.3.2 Selection of samples  
Minimum triplicate samples representing the lot/batch shall be selected.  
B.3.3 Preparation of test specimen  
The liners  used shall be carefully rinsed with water at 25 °C - 30 °C to remove extraneous materials prior to 
actual migration test.  
B.3.4 Simulant quantity  
Equal to at least 1  ml/cm² of contact area.  
Glassware, laboratory appara tus which come into contact with simulants and/or the sample during the test 
shall be thoroughly washed and dried prior to the test.  DEAS 1074 :2021  
© EAC 20 21 – All rights  reserved  9 
 B.3.5 Procedure  
Fill the crown  to its filled capacity with preheated simulant at test temperature and close it. Exclude air  as 
much as possible before sea ling and expose the filled crown closures  to specified temperature maintained in 
oven/water bath/pressure cooker/autoclave for the specified duration of time. After exposure for the specified 
duration, remove the pouch and tr ansfer the contents immediately into a clean Pyrex beaker along with three 
washings of the specimen with small quantity of the fresh stimulant.  
B. 3.6 Determination of amount of extractive  
Evaporate/distil the contents in Pyrex beaker to about 50  ml – 60 ml and transfer into a clean tared stainless 
steel dish along with three  washings of Pyrex beaker with small quantity of fresh stimulant and further 
evaporate the concentrate in the dish to dryness in an oven at 100 °C ± 5  °C. Cool the dish with extractive in a 
desiccator for 30 min utes and weigh to  the nearest 0.1  mg till constant weight of residue is obtained. Calculate 
the extractives in mg/dm²  and mg/kg or mg/ l of the foodstuff with respect to the capacity of pouch to be used.  
Carry out the blank test us ing the same procedure.  
Amount of extractive (Ex)  =
100AM mg/dm2; and  
1000VM
mg/kg or mg/l  
where  
M is the mass in milligrams of residue minus blank value ; 
A is the total surface area in square centimetres  exposed in each rep licate ; and 
V is the total volume in millilitres  of simulant used in each replicate . 
B.4 Evaluation of results  
The materials and articles are regarded as conforming to the specifications if in the migration tests for each 
simulant used, the average of at l east three results does not exceed the value of overall migration limit.  
NOTE  Before carrying out the test, ensure that the sample is free from all traces of dust, fats and other impurities. If 
necessary, it sh ould be thoroughly wiped with filter paper. Th e sample sh ould be handled carefully to avoid any 
contamination.  
B.5 Colour migration  
In the case of coloured liner(s), colour migrated to simulant or dried food products  shall not be apparent to the 
naked eye. If the colour migrated is clearly visible, su ch liners  are not suitable for food contact applications, 
even though the extractive value is within the limit.  
 DEAS 1074: 2021    
 
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