DRAFT UGANDA STANDARD  
  DUS 1969  
First  Edition  
2018-mm-dd  
 
 
 Reference number 
DUS 1969: 2018 
© UNBS 2018  
  
Textiles — Hospital cotton bed sheets — Specificati on  
 DUS 1969: 2018 
ii © UNBS 2018 – All rights reserved
 Compliance with this standard does not, of itself c onfer immunity from legal obligations 
A Uganda Standard does not purport to include all n ecessary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 2018 
All rights reserved. Unless otherwise specified, no  part of this publication may be reproduced or util ised in any 
form or by any means, electronic or mechanical, inc luding photocopying and microfilm, without prior wr itten 
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: +256 417 333 250/1/2 
Fax: +256 414 286 123 
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  
 DUS 1969:2018 
© UNBS 2018 – All rights reserved  iii
 Foreword 
Uganda National Bureau of Standards (UNBS) is a par astatal 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) a member of International Organisation for Stan dardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentar ius 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 o ut through Technical Committees. A Technical 
Committee is established to deliberate on standards  in a given field or area and consists of key stake holders 
including government, academia, consumer groups, pr ivate sector and other interested parties.  
Draft Uganda Standards adopted by the Technical Com mittee are widely circulated to stakeholders and th e 
general public for comments. The committee reviews the comments before recommending the draft standard s 
for approval and declaration as Uganda Standards by  the National Standards Council. 
The committee responsible for this document is Tech nical Committee UNBS/TC 7, Textiles, Leather, Paper 
and related products , Subcommittee SC 1, Textile and related products  
 DRAFT UGANDA STANDARD DUS 1969: 2018 
 
© UNBS 2018  – All rights reserved  1
 Textiles — Hospital cotton bed sheets — Specificati on  
1 Scope 
This Draft Uganda Standard describes the constructi onal details of cotton hospital bed sheets 
2 Normative references 
The following referenced documents referred to in t he text in such a way that some or all of their con tent 
constitutes requirements of this document. For date d references, only the edition cited applies. For u ndated 
references, the latest edition of the referenced do cument (including any amendments) applies. 
US ISO 7211-2, Textiles – Woven fabrics – Construction – Methods o f analysis – Part 2: Determination of 
number of threads per unit length  
US ISO 3801, Textiles — Woven fabrics — Determination of mass pe r unit length and mass per unit area   
US ISO 5079, Textile fibres — Determination of breaking force an d elongation at break of individual fibres   
US ISO 3071, Textiles — Determination of pH of aqueous extract  
US ISO 5077, Textiles — Determination of dimensional change in w ashing and drying  
3 Terms and definitions 
For the purposes of this document, the following te rms and definitions apply. 
ISO and IEC maintain terminological databases for u se in standardization at the following addresses:  
— ISO Online browsing platform: available at http://www.iso.org/obp  
3.1  
dressing materials 
Materials applied to yarns during warp preparation such as size, stiffening or softening agents 
3.2  
filling material 
Non-substantive and generally insoluble materials a dded to fabric together with starches or gums  during 
the finishing process to add weight or to modify th e appearance and handle of the fabric  
2 © UNBS 2018 – All rights reserved
 4 Manufacture 
4.1 Yarn 
4.1.1 The yarn used in the manufacture of cotton cloth sh all be of the required quality to ensure that  the 
cloth complies with the requirements of this Uganda  Standard. The approximate count of warp  and weft is 
given in table 1 
4.2 Cloth 
4.2.1 The cotton cloth used in the manufacture of the hos pital bed sheet shall be woven in plain weave 
4.2.2 The cotton cloth shall be free from dressing and fi lling materials and from substances liable to  cause 
subsequent tendering 
4.2.3 Each traverse end of the bed sheet shall be hemmed to a depth of not less than 20 mm the raw  
edges having a turn of 7 mm before the hem is forme d. The stitching shall be firm and regular. The  
hemming shall be uniform throughout and pressed fla t. The number of stitches per 5 cm shall be  17±2. 
4.2.4 The cotton cloth shall be sheared and singed 
5 Requirements 
5.1 Construction 
The cotton cloth shall comply with requirements of table 1 
Table 1 – Particulars of cotton hospital bed sheets  
Type Yarn count Threads/cm 
(Minimum) Mass (grams 
/m 2) Breaking load on 
50x200 mm in 
Newtons (minimum) 
Warp Weft Ends Picks Warp 
way Weft way  
100% cotton 44tex 44tex 27±1 17±1 254±3 600 500 
 
Test method   
  
US ISO 7211-2  
US ISO 3801  
US ISO 5079 
 
Note: 
1) to convert metric count (Nm) to universal count,  in tex, divide 1000 by the metric count, and to co nvert 
cotton count (Ne) to tex, divide 590.5 by the cotto n count 
2) Ends, picks, mass and breaking load specified, r elate to the specific state of finish in which the bed 
sheet is delivered. 
3) The SI unit for force is the Newton. A force of 1 Newton (1N) is approximately equal to the load ef fect 
of 0.1 kg 
5.2 size 
The hospital bed sheets dimensions when finished sh all be not less than 140 cm width and 255 cm  length DUS 1969: 2018 
© UNBS 2018 – All rights reserved  3
 5.3 Other requirements 
Other requirements of the hospital bed sheets shall  be as given in table 2 
Table 2 – Other requirements of hospital bed sheets  
Characteristic Requirements Test methods 
pH value 6.5 – 7.5 US ISO 3071 
 
Dimensional change  
± 4 %  
US ISO 5077 
 
6 Labelling 
The hospital bed sheet shall be marked at one end w ith the following: 
a) name of the material; 
b) manufacturer’s name, address and trade mark; 
c) design number; 
d) size of the pieces; and 
e) batch or code number. 
7 packaging 
The hospital cotton bed sheet shall be packed in po lyethylene bags, bales or cases 
8 sampling 
8.1 Lots 
8.1.1  The quantity of hospital bed sheet of the same typ e and quality delivered to one buyer against one 
dispatch note shall constitute a lot 
8.1.2  The conformity of the lot to the requirements of t his Uganda Standard shall be determined on  the 
basis of tests carried out on the samples selected from the lot 
8.1.3  The number of pieces to be selected at random from  a lot shall be in accordance with the 
second column of table 3. These pieces shall be sel ected from at least 10 % of the bales, an equal  number 
of pieces, as far as possible, being at random from  each bale. 
Table 3 – Sample size and criteria for conformity 
Number of pieces in the lot Sample size (No of 
pieces to be 
selected)  Permissible No. of non-
conformity pieces Sub- sample size (No of 
pieces to be selected)  
4 © UNBS 2018 – All rights reserved
 Up to 100 10 0 5 
101  to 300 15 1 6 
301  to 500 25 1 7 
501  to 800 35 2 8 
801  to 1300 50 3 9 
1301 to above 75 4 10 
 
8.1.4  For evaluation of; 
a) ends and picks; 
b) mass; 
c) width and length. 
The sample selected in the second column of table 3  shall constitute the sample. 
8.1.5  For evaluation of; 
a) breaking load; 
b) pH value; 
c) shrinkage and elongation. 
The sample selected in the fourth column of table 3  shall constitute the sample (These pieces may be  drawn 
from the pieces selected for the purpose of 8.1.4) 
8.2 Criteria for conformity 
The lot shall be considered to be in conformity wit h the requirements of this Uganda Standard, if the  following 
conditions are satisfied; 
a) The number of non-conforming, with respect to; 
1) ends and picks 
2) mass 
3) length and width does not exceed the correspondi ng number given  in the third column of table 3 
b) From the observed values of breaking load tests in respect to each piece in the  test sample, the 
average breaking load is calculated. From all such average values, the grand average ( )  and the 
average range R1 is  calculated and the value of the expression – 0.4R 1 is found to be greater than 
or  equal to the specified value 
c) From the observed values of shrinkage, the avera ge and the range R are  calculated and the 
value of the expression  + 0.4R is less than or equal to the  specified value 
d) From the observed pH values, the average and the  range R are calculated and  the value of the 
expression     + 0.4R and    – 0.4R lies within the specified limits DUS 1969: 2018 
© UNBS 2018 – All rights reserved  5
 Note  
1) Average (  ) is the value obtained by dividing t he sum of observed values by the number of  tests. 
2) Range ( R) is the difference between the maximum and the min imum in a set of observed values 
  
6 © UNBS 2018 – All rights reserved
 Bibliography 
[1] TZS 214:2012, Textiles — Hospital cotton bed sheets — Specificati on  
 DUS 1969: 2018 
© UNBS 2018  – All rights reserved  7
 Certification marking 
Products that conform to Uganda standards may be ma rked 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 lic ensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conj unction with the relevant Uganda Standard. The 
presence of this mark on a product or in relation t o a product is an assurance that the goods comply w ith the 
requirements of that standard under a system of sup ervision, control and testing in accordance with th e 
certification mark scheme of the Uganda National Bu reau 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 1969: 2018 
 
ICS 97.160 
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© UNBS 2018– All rights reserved