DRAFT UGANDA STANDARD  
  DUS 630  
Second Edition  
2020 -mm-dd 
 
 
 Reference number  
DUS 630: 2020  
© UNBS 2020   
  
Vegetable -tanned bend outer sole leather — Specification  
 DUS 630: 2020  
ii © UNBS 2020  – 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 2020   
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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Uganda  
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 DUS 630:2020  
© UNBS 2020  – All rights reserved  iii 
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Minist ry 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 
Commit tee 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 committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
The committee respons ible 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 630:2006 ), which has been tec hnically re vised.  
 DRAFT UGANDA STANDARD  DUS 630: 2020  
 
© UNBS 2020  – All rights reserved  1 
 Vegetable -tanned bend outer sole leather — Specification  
1 Scope   
This draft Uganda standard specifies requirements , sampling  and methods of test  for vegetable -tanned bend 
outer sole leather . 
2 Normative references   
The following referenced docume nts 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 an y amendments) applies.  
DUS 2250 , Standard Test Method for Compressibility of Leather  
ISO 2588, Leather — Sampling — Number of items for a gross sample  
ISO 5404, Leather — Physical test methods — Determination of water resistance of heavy leathers  
US ISO 24 19, Leather — Physical and mechanical tests — Sample preparation and conditioning  
US ISO 2589, Leather — Physical and mechanical tests — Determination of thickness  
US ISO 3378 , Leather — Physical and mechanical tests — Determination of resistance to grain cracking and 
grain crack index  
US ISO 4045, Leather — Chemical tests — Determination of pH and difference figure  
US ISO 4047, Leather — Determination of sulphated total ash and sulphated water -insoluble ash  
US ISO 4098, Leather — Chemical tests — Determina tion of water -soluble matter, water -soluble inorganic 
matter and water -soluble organic matter  
US ISO 4684, Leather — Chemical tests — Determination of volatile matter  
3 Terms and definitions   
For the purposes of this document, the followi ng terms and defin itions apply.  
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  
3.1  
bend  
half a bovine hide, produced by cutting along the backbone lin e with the belly and shoulder parts removed   
2 © UNBS 2020  – All rights reserved  
 4 Requirements  
4.1 General requirements  
4.1.1 Tannage  
The leather shall be tanned with vegetable tanning materials only and shall show no signs of raw streaks or 
patches.  
4.1.2  Form 
The leather shall be supplied in the form of well -trimmed bends  
4.1.3  Physical appearance  
The leather shall be full grain or may be slightly snuffed, provided that such snuffing shall have removed the 
top portions only of the hair follicles. The flesh side shall be free from adhering f lesh and shall be smooth. The 
leather shall be free from imperfection s and blemishes that affect its  appearance or that may  affect its 
serviceability (or both). Any defects present shall be such that the cutting area of the bend is not reduced by 
more than  6.5 dm².  
4.1.4  Thickness  
The nominal thickness of the leather shall be within one of the following ranges , as specified by the purchaser  
a) 3.5 mm – 4.9 mm;  
b) 5.0 mm – 5.9 mm; or 
c) 6.0 mm – 7.0 mm. 
The actual  thickness  at any point  on a bend  shall not fall outside  the appropriate  range  by more  than 0.5 mm. 
4.2 Chemical requirements  
When the leather is tested : 
a) the pH value shall be between  3.3 and 3.5 in accordance with clause 5.4 
b) the water -soluble matter content, calculated on a moisture -free basis, shall not  exceed a  mass 
fraction of 21 % in accordance with clause 5.5 
c) the volatile matter content as received (that is,  without prior conditioning) shall not exceed a mass 
fraction of 17 %; in accordance with clause 5.6 and 
d) the sulphated ash content of the water -soluble ma tter, calculated on a moisture -free basis, shall not 
exceed a mass fraction of 4.2 % in accordance with clause 5.7 
4.3 Physical  requirements  
When  the leather  is tested  in accordance  with 
a) 5.8, the grain extension shall be at least 15 %;  
b) 5.9, the compressibi lity shall not exceed 10 %; and  DUS 630: 2020  
© UNBS 2020  – All rights reserved  3 
 c) 5.11, the water penetration rate shall be such that the amount of water that passes through the test 
sample in the first 10 min after penetration has occurred shall not exceed 0.25 g/dm².  
5 Methods of test 
5.1 Test specimens  
Take  the test specimens  for both  the chemical  and the physical  tests  from  the physical  test position  
specified in Clause  2 of US 655. 
5.2 Preparation  and conditioning  of test specimens  
Prepare  and condition  the test specimens  in accordance  with US ISO 241 9 
NOTE  The physical tests should be conducted without removing the test specimens  from the conditioned 
atmosphere.  
5.3 Thickness  
Use U S  ISO 2589  
5.4 pH value  
Use US ISO 4045  
5.5 Water -soluble  matter  content  
Use US ISO 4098  
5.6 Volatile  matter  content  
Use US ISO 4684  
5.7 Sulphated  ash content  of water -soluble  matter  
Use US ISO 4047  
5.8 Grain  extension  
Use US ISO 3378  
5.9 Compressibility  
Use DUS 2250  
5.10 Water  penetration  rate 
Use ISO 5404  
6 Packaging  
The sole leather shall be wrapped in a suitable material that will protect them from damage during normal 
transportation and storage.   
4 © UNBS 2020  – All rights reserved  
 7 Labelling  
The following shall be legibly and indelibly labelled on the package  
a) manufacturer’s name, address and/or trade mark  
b) country of origin  
c) thickness  
d) weight  
e) dimensions  
f) descr iption of the product  e.g vegetable  tanned bend outer sole leather  
8 Sampling  
Sampling shall be done in accordance with ISO 2588  DUS 630: 2020  
© UNBS 2020  – All rights reserved  5 
 Bibliography  
[1] US 630:2006,  Vegetable -tanned bend outer sole leather — Specificatio n 
 DUS 630: 2020  
© UNBS 2020  – All rights reserved  7 
 Certification marking  
Products that co nform 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 Regulations made 
thereunder. This mark c an 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 assuran ce 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 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 630: 2020    
 
ICS 59.140.35 
Price based on nn pages  
© UNBS 2020 – All rights reserved