DRAFT UGANDA STANDARD  
  DUS 583  
Second  Edition  
2021 
 
 
 Reference number  
DUS 583 : 2021 
© UNBS 2021 
  
Footwear materials — Determination of c ollapsing load of 
domed shapes  
 DUS 583 : 2021 
ii © UNBS 2021 – All rights reserved  
 Compliance with this standard does not, of itself confer immunity from legal obligations  
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© UNBS 20 21  
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 DUS 583 :2021 
© UNBS 2020  – All rights reserved  iii 
 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 Uga nda, 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 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 comm ittee 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 Technical Committee UNBS/TC 7, Textiles, Leather, Paper 
and related products, Subcommittee SC 2, Leather and related products.  
This second edition cancels and replaces the first edition ( US 583 :2007 ), which has been revised:  
The document  has been put in the new template  for standard development  as per the ISO/IEC  Directives, Part 
2:2019  
 DRAFT UGANDA STANDARD  DUS 583: 2021 
 
© UNBS 2021– All rights reserved  1 
 Footwear materials — Determination of c ollapsing load of 
domed shapes  
1 Scope  
1.1 Part A of this draft Uganda S tandard specifies a method for the preparation of dome -shaped test 
specimens formed from thermoplastic or solvent -activated toe -puff, stiffener or similar footwear materials.  
1.2 Part B of this draft Uganda S tandard specifies a method for the measurement of the collapsing load of 
these dome -shaped test specimens.  
2 Normative references  
The following referenced documents r eferred 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 ame ndments) applies.  
DUS ISO 17709 , Footwear — Sampling location, preparation and duration of conditioning of samples and test 
pieces  
3 Terms and definitions  
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  
No terms and definitions are listed in this document.  
4 Principle  
4.1 Part A  
Test specimens of thermoplastic or solvent -activated materials are formed into dome shapes, using dome 
former s. 
4.2 Part B 
The collapsing load of the dome -shaped test specimen is determined by means of a compression cage and a 
tensile testing machine.   
2 © UNBS 2021 – All rights reserved  
 5 Reagents and apparatus  
5.1 Reagents (Part A)  
5.1.1 Methylene chloride , or a mixture of equal parts of methyl et hyl ketone and acetone  
5.1.2 Silicone -based release agent  
5.2 Apparatus (Part A)  
5.2.1 Dome formers  (see Figure  1) 
5.2.2 Toggle type clamp  
5.2.3 Fan-assisted oven , set at 95  °C ± 5 °C 
5.3 Apparatus (Part B)  
5.3.1 Tensile testing machine  that has the follow ing characteristics:  
 a rate of traverse of 50 mm/min; and  
 load ranges from 50 N to 500 N, with one or more ranges in between, for example , 100 N to 200  N. 
5.3.2 Compression  type cage  
5.3.3 Repeated collapsing devi ce, manually operated  
6 Preparation of test  specimens  
6.1 From each test sample of footwear material, cut six circular test specimens of diameter 57 mm ± 1 mm.  
6.2 From thin polyethylene, cut six rings of outside diameter 57 mm and inside diameter 38 mm (for 
material coated with adhesive on one sid e only).  
6.3 Also from polyethylene , cut six circular discs of diameter 57 mm (for material coated with adhesive on 
both sides).  
7 Procedure (Part A)  
7.1 Forming domes of thermoplastic footwear materials  
7.1.1 Release the two spring -loaded toggle clips C a nd remove ring R (see Figure  1). 
7.1.2 Remove any contamination from the spherical surface of plunger P. the inner surface of ring R  and 
the end of cylinder Y with solvent or by gentle scraping.  
7.1.3 Loosen screw S and slide plunger P down in cylinder Y. Retighten screw S.  
7.1.4 Proceed as follows:  
a) in the case of materials not coated with adhesive , place a test specimen on top of cylinder Y.  Place 
clamping ring R over cylinder Y and attach toggle clips C to lugs L and close;  DUS 583 : 2021  
© UNBS 2021 – All rights reserved  3 
 b) in the case of materials coated with adhesive on one side only , place a test specimen on top of cylinder Y, 
with the adhesive coating uppermost. P lace a polyethylene ring (see 6. 2) on the test specimen before 
closing clamping ring R as in (a) above; and  
c) in the case of materials  coated with adhesive on both sides,  first place a polyethylene disc (see 6 .3) on top 
of cylinder Y, then place the test specimen on top of the disc and finally pl ace the polyethylene ring (see 
6.2) on top of the test specimen. Close clamping ring R as in (a) above.  
7.1.5 Set the oven (see 5 .2.3) and, after its temperature has stabilized, place all six prepared dome formers  
in it. If the oven is not fan -assisted, so adjust the temperature setting that the test specimen reaches a 
temperature of 80  °C within a period of 8 min to 9 min.  
7.1.6 After 8 min, remove one former from the oven (using heat -resistant gloves) and fit the bottom of the 
former's plunger onto the shaped base of the toggle type clamp.  
7.1.7 Loosen screw S. Immediately close the toggle handle  so that cylinder Y is pushed into contact with 
the base of the clamp. Hold the cylinder in this position and retighten screw S.  
7.1.8 Mould the test specimens in the remaining five formers without delay in the same way, removing them 
from the oven one at a time, so that all six are moulded within one minute.  
7.1.9 After dome forming, leave the formers for at least 2 h in a conditioned atmosphere as specified in ISO 
17709 , before removing the test specimens from them. Leave the test specimens in this condit ioned 
atmosphere for a further 0.5 h before testing.  
7.2 Forming domes of solvent activated footwear materials  
7.2.1 Repeat the steps given in 7.1.1 and 7 .1.2. 
7.2.2 Loosen screw S and slide plunger P down in cylinder Y. Retighten screw S.  
7.2.3 Spray plun ger P's dome, the top and inside surfaces of cylinder Y and the inside surfaces of clamping 
ring R with the sil icone -based release agent (see 5.1. 2). 
7.2.4 Pour solvent (see 5 .1.1, or use solvent recommended by the manufacturer of the material) into a dish  
or beaker.  
7.2.5 Using a pair of tongs, dip a test specimen into the solvent and remove after 1 s.  
7.2.6 Place the test specimen on a wire mesh and allow to stand for 2 min, unless otherwise specified by 
the manufacturer of the material.  
7.2.7 Place a po lythene disc (see 6 .3) centrally on the top edge of cyli nder Y, followed by the solvent -
activated test spec imen and a polythene ring (see 6 .2). Thereafter, place clamping ring R over cylinder Y and 
attach toggle clips C to lugs L and close.  
7.2.8 Fit the bo ttom of plunger P into the shaped base of the toggle type clamp.  
7.2.9 Loosen screw S. Immediately close the toggle handle so that cylinder Y is pushed into contact with 
the base o f the clamp. Hold the cylinder i n this position and retighten screw S.  
7.2.10 Mould the five remaining test specimens in formers in the same way.  
7.2.11  After dome forming, leave the formers for 24 h in a conditioned atmosphere as specified in ISO 
17709 , before removing the test specimens from them. Leave the test specimens in thi s condition ed 
atmosphere for a further 24 h before testing.   
4 © UNBS 2021 – All rights reserved  
  
 
 
 
 
 
 
 
 
 
 
8 Procedure (Part B)  
8.1 General  
Submit three test specimens to the dry collapsing load test and three to the wet collapsing load test.  
8.2 Dry collapsing load  
8.2.1 Fit the compressi on cage (see 5 .3.2) into th e tensile testing machine (see 5 .3.1). Set the machine to a 
suitable load range.  
8.2.2 Place a dry test specimen in the compression cage such that the test specimen is centrally under the 
compression plunger. and start the machin e. (The compression will need to be stopped once it is clear that 
the peak load has been reached and passed.) Record the peak load as the "first dry collapsing load" L for that 
test specimen, and then remove the test specimen.  
8.2.3 Reset the cross -head of  the tensile machine, and test the two remaining test specimens as in 8 .2.2. 
Calculate and report the average of these three results as the "average first dry collapsing load" L1 of the 
material.  
8.2.4 Using a test specimen from 8 .2.3, remove any deformati on with the fingers. Now collapse the test 
specimen, using the manually operated r epeated collapsing device (see 5 .3.3) eight times, ensuring that the 
centre of the dome touches the baseplate every time. Remove any deformation with the fingers. Collapse th e 
remaining two test specimens in the same way.  
8.2.5 Re-measure the collapsing loads of all three test specimens, us ing the procedure described in 8.2.2 
and 8 .2.3; calculate the average of the results and report this as the "av erage tenth dry collapsing l oad’' 
DUS 583 : 2021  
© UNBS 2021 – All rights reserved  5 
 8.3 Wet collapsing load  
8.3.1 Soak the three test specimens for the wet tests in deionized or distilled water at 20  °C ± 5 °C for 1 h.  
8.3.2 Measure the collapsing loads of each wet test specimen in the same way as for the dry test 
specimens. Calcula te and report the "average first wet collapsing load" L1 and the "average tenth wet 
collapsing load" L10 
9 Calculation of results for wet and dry test specimens  
Calculate the resilience R in the following way:  
100
110
LLR
 
where  
R is the resilie nce, as a percentage , of the material.  
L10 is the average tent h, in Newtons , of wet or dry collapsing load . and 
L1 is the average first wet or dry collapsing load, in Newtons.  
---------------   
6 © UNBS 2021 – All rights reserved  
 Bibliography  
US 583 :2007 , Footwear materials — Determination of  collapsing load of domed shapes  
 DUS 583 : 2021  
© UNBS 2021– All rights reserved  7 
 Certification marking  
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(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 583 : 2021   
 
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