DRAFT UGANDA STANDARD  
  DUS 676  
Second  Edition  
2021 
 
 
 Reference number  
DUS 676 : 2021 
© UNBS 2021   
  
Footwear — Determination of flex resistance for leather 
fibreboard and c ellulose fibreboard inner soles  
 DUS 676 : 2021 
ii © UNBS 2021 – 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 2021   
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
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permission from UNBS.  
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The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: 256 414 505 995 
Fax: 256 414 286 123  
E-mail: unbs@infocom.co.ug  
Web: www.unbs.go.ug  
 DUS 676 :2021 
© UNBS 2021 – 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 Uganda, as amended.  UNBS is mandated to co -
ordinate the elaboration of standards and is  
a member of International Organisation for Standardisation (ISO) and  
a contact point for the WHO/FAO Codex Alimentarius Commission on Food S tandards, and  
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 p ublic for comments. The committee 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 31 6, Footwear  
This second edition cancels and re places the first edition (US 676 :2007), which has been technically revised  
 DRAFT UGANDA STANDARD  DUS 676: 20 21 
 
1 © UNBS 20 21– All rights reserved   
 Footwear — Determination of flex resistance for leather 
fibreboard  and cellulose fibreboard inner soles  
1 Scope  
This draft Uganda Standard specifies a method for the determination of flex resistance for leather fibreboard 
and cellulose fibreboard inner soles  
2 Normative  references  
The following referenced documents 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 (including any amendments) applies  
US 656 , Preparation of samples (leather; elastomeric m aterial and other footwear materials)  
3 Terms and definitions  
No terms and definitions are listed in this document  
ISO and IEC maintain terminological databases for use in standardization at the following addresses:  
— ISO Online browsing platform: availab le at http://www.iso.org/obp  
4 Apparatus  
A suitable flexing machine which flexes the specimen under a standard tension of 19.6 N through an angle of 
180° ( that is,  90° on each side of the vertical) at a rate of 60 flexes per minute (see Figure  1). The numb er of 
flexes the specimen receives before breaking is recorded automatically on a mechanical counter.  
  
2 © UNBS 2021 – All rights reserved  
 (a) 
 
(b) 
Figure 1 — Flexing machine  
5 Preparation of test specimens  
5.1 Using a suitable press -knife, cut three test specimens of size 7.6 0 cm ± 0.02 cm by 1.2 5 cm ± 0.02 cm 
in one direction from the material  under test and three test specimens of the same dimensions in a direction at 
right angles to the first . 
5.2 Condition the test specimens in accordance with US 656. 
6 Procedure  
6.1 Clamp the test spe cimens in sample holders of the apparatus, as shown in Figure 1, ensuring that each 
is vertical and placing a piece of the test material of the same width and thickness in th e upper part of each 
upper jaw.  
6.2 By means of a wrench , tighten the jaws  securin g the test specimens to a torque of  245.2  N-cm. Set the 
automatic counters to ze ro, and set the flexing machine in motion. The end -point of the test on each specimen 
is reached when the specimen breaks.  
7 Results  
Record the number of flexes each specimen r eceives before breaking, and report the flex resistance as the 
average of the number of flexes withstood by all the specimens.  DUS 676 : 2021 
© UNBS 2021 – All rights reserved  3 
 Bibliography  
US 676:2007, Footwear — Determination of flex resistance (leather fibreboard and cellulose fibreboard inner 
soles)  
 DUS 676 : 2021 
4 © UNBS 20 21– All rights reserved   
 Certification marking  
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the UNBS Certification Mark is governed by the Standards Act, and the R egulations 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 National Bureau of Standards. UNBS mark ed 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 676 : 2021   
 
ICS 61.060  
Price based on 9 pages  
© UNBS 2021– All rights reserved