DRAFT UGANDA STANDARD  
  DUS 2441  
First Edition  
2021 -mm-dd 
 
 
 Reference numbe r 
DUS 2441: 2021  
© UNBS 2021   
  
Bathroom Slippers  — Specification  
 DUS 2441 : 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 applic ation  
© UNBS 2021   
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written 
permission from  UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: 256 41 4 505 995  
Fax: 256 41 4 286 123  
E-mail: unbs@infocom.co.ug  
Web: www.unbs.go.ug  DUS 2441: 2021  
© UNBS 2021  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 General  requirements  ................................ ................................ ................................ ...........................  2 
5 Packaging  ................................ ................................ ................................ ................................ ...............  3 
6 Labelling/marking  ................................ ................................ ................................ ................................ .. 3 
Annex  A (normative)  Table A.1 — Children’s sizes  ................................ ................................ .......................  5 
Annex  B (normative)  Method for determination of compression set at constant stress  ..........................  7 
B.1 Apparatus  ................................ ................................ ................................ ................................ ...............  7 
B.2 Test piece  ................................ ................................ ................................ ................................ ...............  7 
B.3 Procedure  ................................ ................................ ................................ ................................ ...............  7 
B.4 Expression  of results  ................................ ................................ ................................ ............................  7 
Annex  C (normative)  Method for determination of room temperature shrinkage  ................................ ...... 8 
C.1 Test piece  ................................ ................................ ................................ ................................ ...............  8 
C.2 Conditioning  of the test piece  ................................ ................................ ................................ ..............  8 
C.3 Number  of tests  ................................ ................................ ................................ ................................ ..... 8 
C.4 Procedure  ................................ ................................ ................................ ................................ ...............  8 
C.5 Calculation  ................................ ................................ ................................ ................................ .............  8 
Annex  D (normative)  Method for determination of heat shrinkage  ................................ ..............................  9 
D.1 Test pieces  ................................ ................................ ................................ ................................ .............  9 
D.2 Conditioning  of test piece  ................................ ................................ ................................ .....................  9 
D.3 Number  of tests  ................................ ................................ ................................ ................................ ..... 9 
D.4 Procedure  ................................ ................................ ................................ ................................ ...............  9 
D.5 Calculation  ................................ ................................ ................................ ................................ .............  9 
Annex  E (normative)  Method for the determination of water absorption  ................................ ..................  10 
E.1 Test pieces  ................................ ................................ ................................ ................................ ...........  10 
E.2 Conditioning  ................................ ................................ ................................ ................................ ........  10 
E.3 Procedure  ................................ ................................ ................................ ................................ .............  10 
E.4 Expression  of results  ................................ ................................ ................................ ..........................  10 
Annex  F (normative)  Method for the determination of split tear  ................................ ................................  11 
F.1 Apparatus  ................................ ................................ ................................ ................................ .............  11 
F.2 Conditioning  ................................ ................................ ................................ ................................ ........  11 
F.3 Test pieces.  ................................ ................................ ................................ ................................ ..........  11 
F.4 Procedure  ................................ ................................ ................................ ................................ .............  11 
F.5 Results  ................................ ................................ ................................ ................................ ..................  11 
Annex  G (normative)  Method for the determination of strength required to pull the strap from 
soling hole at the heel and toe end  ................................ ................................ ................................ ... 13 
G.1 Apparatus  ................................ ................................ ................................ ................................ .............  13 
G.2 Test piece  preparation  ................................ ................................ ................................ ........................  13 
G.3 Procedure  ................................ ................................ ................................ ................................ .............  13 
G.4 Expression  of results  ................................ ................................ ................................ ..........................  13 DUS 2441 : 2021  
iv © UNBS 2021  – All rights reserved  
 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 Ugand a, 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 En quiry 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 commit tee 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 i s Technical Committee UNBS/TC 316 , Footwear  
 DRAFT UGANDA STANDARD  DUS 2441:  2021  
 
© UNBS 2021 – All rights  reserved  1 
 
 
 Bathroom Slipper s — Specification  
1 Scope  
This draft Uganda S tandard specifies the requirements and methods of test for bathroom slippers . 
2 Normative references  
The following referenced documents are indispensable for the application of this document. For dated 
reference s, only the edition cited applies. For undated references, the latest edition of the referenced 
document ( including any amendments) applies.  
ISO 48-2, Rubber,  vulcanized  or thermoplastic  — Determination  of hardness — Part 2: Hardness  between  10 
IRHD  and 100 IRHD  
ISO 16177 , Footwear  — Resistance  to crack  initiation  and growth — Belt flex method  
ISO 2420 , Leather  — Physical  and mechanical  tests  — Determination  of apparent  density  and mass  per unit 
area 
ISO 3377 -1, Leather  — Determination  of tearing  load.  
US ISO 17706 , Footwear — Test methods for uppers — Tensile strength and elongation  
US ISO  20871 , Footwear -Test methods for outsoles -Abrasion resistance  
US ISO  3376 , Leather — Physical and mechanical tests — Determination of tensile strength and percentage 
extension  
3 Terms and definitions  
For the purposes of this standard, the following terms and definitions shall apply.  
ISO and IEC maintain terminological databases for use in standardization at the following addresses:  
— ISO Online browsing platform: availa ble at http://www.iso.org/obp  
3.1  
bathroom slipper  
a type of footwear that can be slipped on and off easily made with straps and worn in the bathroom . DUS 2441: 2021  
2 © UNBS 2021  – All rights reserved  
 
 
 4 General  requirements  
4.1 The bathroom slipper sole shall be made of a material that is non -slippery su ch as  rubber , TPU in 
combination with EVA for user comfort in the bathroom  
4.2 The surface shall be free from blisters, cavities, collapses or blemishes. The die markings shall be neat 
and clean and the surface shall have reasonably good finish.  
4.3 The le ngth and the standard sizes shall be as in Annex A.  
4.4 The minimum sole thickness shall be 15 mm for all the sizes.  
4.5 The physical requirements for sole and the strap material shall comply with the values given in Tables 1 
and 2 respectively  
Table 1 — Physical requirements for sole material  
 
S/N  
Parameter   
Requirement   
Test 
method  
i) Density  g/cm3 0.2 ― 0.5 ISO 2420  
ii) Hardness  (IRHD)  30 ― 55 ISO 48-2 
iii) Tensile  strength  (MPa),  min. 1.0 US ISO 3376  
iv) Elongation  (%), min. 50 US ISO 3376  
v) Tear strength,  N, min. 35 ISO 3377 -1 
vi) Compression  set at constant  stress  (%), max.  35 Annex  B 
vii) Flexing resistance:  
 
Flexing  endurance  (Flexing  cycles),  min. 
 
Cut growth  at the end of 35 000 cycles  at 500 % (mm),  max.  
 
35 000 
 
3 
3  
 
 
ISO 16177  
viii) Abrasion  loss (cubic  mm),  max.  1200  US ISO 20871  
ix) Room  temperature shrinkage  at 25 2 ˚C for two weeks  (%), 
max.  1.0 Annex  C 
x) Heat  shrinkage  for 1 h at 100 ˚C, (%) max.  2.0 Annex  D 
xi) Water  absorption  (%), max.  5 Annex  E 
xii) Split tear strength  (N), min. 35 Annex  F 
 DUS 2441: 2021  
 
 
© UNBS 2021  – All rights reserved  3 
 
 
  
Table 2 — Physical requirements for the strap  
S/N  
Parameter   
Requirement   
Test method  
PVC Rubber  
i) Tensile  strength  (MPa), min . 5 15 US ISO 3376  
ii) Elongation  (%), min. 150 250  
US ISO 3376  
iii) Breaking  strength  (N), min.  
180  
180  
US ISO 17706   
a) Stem  
b) Toe 180 180 
c) Heel 150 150 
iv) Pull strength  (N), min.  
100  
100  
Annex  G  
a) Toe end 
b) Heel end 100 100 
Note:  In number  iii), test pieces  to be cut in lengthwise  direction  only.  
5 Packaging  
5.1 Each piece shall be packed with its complementary piece  
5.2 The pieces shall be of the same size and shape (design).  
5.3 The pair shall be packed  in a suitable  material so as to protect the product from damage during 
transportation and storage  
6 Labelling /marking  
6.1 Slippers shall be legibly and indelibly  marked  with the following:  
a) the manufactu rer’s name, initials or trade -mark;  and 
b) size  
6.2 Each package shall be marked with the following information  
a) the manufacturer’s name and/or trade -mark and physical address;  DUS 2441: 2021  
4 © UNBS 2021  – All rights reserved  
 
 
 b) name of item;  
c) color; and  
d) country of origin  
 DUS 2441: 2021  
 
 
© UNBS 2021  – All rights reserved  5 
 
 
 Annex  A 
(normative)  
 
Table A.1 — Child ren’s size s 
Size Minimum  length  (mm)  
3 126.50  
4 135.00  
5 143.50  
6 152.00  
7 160.50  
8 169.00  
9 177.50  
10 186.00  
11 194.50  
12 203.00  
13 211.00  
 
Table A.2 — Adult’s size s 
Size Minimum  length  (mm)  
1 220.00  
2 220.50  
3 237.00  
4 245.50  
5 254.00  
6 262.00  
7 271.00 
8 279.5 0 
9 288.0 0 
10 296.5 0 DUS 2441: 2021  
6 © UNBS 2021  – All rights reserved  
 
 
 11 305.00  
12 313.50  
13 322.00 
 DUS 2441: 2021  
 
 
© UNBS 2021  – All rights reserved  7 
 
 
 Annex  B 
(normative)  
 
Method for determination of compression set at constant stress  
B.1 Apparatus  
Consists  of two parallel,  flat, rigid plates  between  which  the test piece  shall be compressed  and the means  of 
which  a load of 140 kg ± 1 kg is applied.  
B.2 Test piece  
The test pieces  shall be three  discs  of diameter  30 mm ± 0.2 mm of any thickness.  
B.3 Procedure  
B.3.1  Condition  the test pieces  at 27˚C ± 2˚C and 65% ± 5% relativ e humidity  for 24 h. Conditioning of the 
sample shall be done in accordance with ISO 554  
B.3.2  Measure  the initial  thickness  of each  test piece  at the center  using  the gauge  with part-spherical  
contact.  
NOTE  Take  the arithmetic mean of three  readings  as th e initial thickness.  
B.3.3  Place  the three  test pieces  on parallel  plates  of the compression  apparatus  and subject  to a 
compression  load of 140 kg ± 1 kg for 24 h. 
B.3.4  Release  the load,  remove  the test pieces  and allow  to recover.  
B.3.5  After 1 h, measur e the thickness and note the arithmetic mean as the final thickness.  
B.4 Expression  of results  
Percentage compression set = [(t0- t1)/t0] x 100  
Where  
t0   is initial thickness in mm  
t1   is final thickness in mm  DUS 2441: 2021  
8 © UNBS 2021  – All rights reserved  
 
 
 Annex  C 
(normative)  
 
Method for determinati on of room temperature shrinkage  
C.1 Test piece  
Cut from the samples,  test pieces  of minimum  dimensions  125 mm x 5 mm x 15 mm, after splitting  all the sides  
of the sample.  
C.2 Conditioning  of the test piece  
Condition  the test piece  at 65 % ± 5 % relative  humidity and  27˚C ± 2˚C for at least  24 h prior to testing.  
Conditioning of the sample shall be done in accordance with ISO 554  
C.3 Number  of tests  
Carry  out tests  on at least  three  test pieces.  
C.4 Procedure  
Condition  the test piece. Measure  the length  of the test piece  to the nearest  0.1 mm. Keep  the test piece  
suitably  in a closed  chamber  maintained  at 27˚C ± 2 ˚C for 2 weeks.  Remove  the test piece  from the 
chamber  and measure  its length  again.  
C.5 Calculation  
Calculate  the room  temperature  shrinkage  as follows:  
Room temperature shrinkage = [(L0- L)/L0] X 100  
Where  
L0  is the length of the test piece in mm, before heating  
L  is the length of the test piece in mm, after heating for two weeks  
 
 DUS 2441: 2021  
 
 
© UNBS 2021  – All rights reserved  9 
 
 
 Annex  D 
(normative)  
 
Method for determination of heat shrinkage  
D.1 Test pieces  
Cut test pieces  of minimum  dimensions  150 mm x 25 mm x 15 mm from post-cured  sole by means  of a knife.  
D.2 Conditioning  of test piece  
Condition  the test piece  at 27˚C ± 2˚C temperature  and 65 % ± 5 % relative  humidity  at least  24 h prior to 
testing.  Conditioning of the sample shall be done in accordance with ISO 554  
D.3 Number  of tests  
Carry  out test on at least  three  test pieces.  
D.4 Procedure  
Trace the test piece o n a piece of white paper.  Measure  the length of the test piece to the nearest 0.1 mm.  
Keep  the test piece  suitably  in an oven  (Thermostatically  controlled)  for 1 h at 100˚C ± 1°C. Take  out the 
piece  from  the oven  and cool to ambient  temperature.  Keep  the test piece  at room  temperature  for a 
minimum  2 h. Trace  it again  on the same  paper  and measure  the length  of the test piece  on paper.  
D.5 Calculation  
Calculate  the shrinkage  as follows:  
Shrinkage = [(L0-L1)/L0] X 100  
Where  
L0  is length of the test piece, i n mm, before heating, and  
L1  is length of test piece, in mm, after heating and cooling to room temperature  
 
 DUS 2441: 2021  
10 © UNBS 2021  – All rights reserved  
 
 
 Annex  E 
(normative)  
 
Method for the determination of water absorption  
E.1 Test pieces  
Cut three  pieces  of 5 mm x 5 mm x 5 mm after shrinking  all sides of the sample.  
E.2 Conditioning  
Condition  for 24 h prior to testing  at 27˚C ± 2˚C and 65 % ± 5 % relative  humidity . Conditioning of the sample 
shall be done in accordance with ISO 554  
E.3 Procedure  
E.3.1  After  conditioning  the test piece,  weigh  to the nearest  0.5 mg and immerse  in distilled  water  for a 
period  of 24 h at 27 ˚C ± 2˚C. 
E.3.2  Remove  from the water,  wipe dry the exposed  surfaces  with blotting  paper.  
E.3.3  Weigh  the test piece  again  to the nearest  0.5 mg within  2 min of the removal  of the test piece  from 
water.  
E.4 Expression  of results  
Calculate  the water  absorption  as follows:  
Water absorption percentage  = [(M-M0)/M 0] X 100  
Where  
M  is mass in g, of the test piece after immersion in water , and  
M0  is mass in g, of the test piece before immer sion in water  
 DUS 2441: 2021  
 
 
© UNBS 2021  – All rights reserved  11 
 
 
 Annex  F 
(normative)  
 
Method for the determination of split tear  
F.1 Apparatus  
Tensile testing equipment  with a rate traverse of 75 mm per minute  
F.2 Conditioning  
Condition  the samples for  24 h prior to  testing at  25˚C ± 2˚C and 65  % ± 5 % relative  humidity.  Conditioning of 
the sample shall be done in accordance with ISO 554  
F.3 Test pieces.  
After  conditioning  the test piece,  cut three  test pieces  of 25 mm x 100 mm along  and across  the direction  
of the bottom  material  of a bathroom  slipper  or a sheet.  Prepare  each  test piece  by splitting  it with a 
knife  or any other  suitable  method  through  midway  between  the top and the bottom surfaces  for a 
distance of 30 mm from one  end to form two tongues.  See Figure  below.  
F.4 Proc edure  
Clamp one  tongue of the  test piece on the  upper jaw,  and the  other  on the lower jaw.  Start  the machine  and 
set the rate of  separation speed at  a constant rate of 75mm per  minute.  
F.5 Results  
After  the test pieces  have separated, note  the maximum load and  record  the arithmetic  mean of the three test 
pieces  in Newton (N) as the  split tear strength  of the sample  
Dotted line shows knife cut  
a) Test piece before cut  (diagram a)  
b) Test piece after cut  (diagram b)  
 
 DUS 2441: 2021  
12 © UNBS 2021  – All rights reserved  
 
 
 
 DUS 2441: 2021  
 
 
© UNBS 2021  – All rights reserved  13 
 
 
 Annex  G 
(normative)  
 
Method for t he determination of strength required to pull the strap from 
soling hole at the heel and toe end  
G.1 Apparatus  
Tensile  testing  machine . Tensile  testing  equipment  with a rate traverse  of 75 mm per minute  
G.2 Test piece  preparation  
Cut the test piece  as show n in the diagram  Figure  1, to have  test pieces  as shown  in Figure  2. For  each  test, 
cut three  test pieces.  
G.3 Procedure  
Insert  one of the test pieces  cut from the bottom  material  (Figure  1) in the holding  device  and clamp  as shown  
in Figure  2 in the tensi le testing  machine.  Pull until the button  comes  off, Record  the force  in Newton  (N). 
Record  an average  of three  readings  
G.4 Expression  of results  
G.4.1  The force  required  to pull button  through  the hole in the sole.  
G.4.2  Malformation  occurring  to sole during procedure.  
G.4.3  Malformation  occurring  to strap  during  procedure.  DUS 2441: 2021  
14 © UNBS 2021  – All rights reserved  
 
 
  
Figure 1  
 
Figure  2 DUS 2441: 2021  
 
 
© UNBS 2021  – All rights reserved  15 
 
 
 Bibliography  
DKS1620:2020 , Bathroom slippers  – Specification  
 DUS 2441: 2021  
© UNBS 2021 – All rights  reserved  17 
 
 
 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 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 
requiremen ts 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.  
Furth er particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 DUS 2441 : 2021    
 
ICS 61.060 
Price based on 22 pages  
© UNBS 2021 – All rights reserved