DRAFT UGANDA STANDARD  
  DUS 1687 -7 
First  Edition  
2017 -mm-dd 
 
 
 Reference number  
DUS 1687 -7: 2017  
© UNBS 2017   
  
School Clothing  — Part 7: Knee -high stockings and ankle socks  
 DUS 1687 -7: 2017  
ii © UNBS 2017  – 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 
respon sible for its correct application  
© UNBS 2017  
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 pr ior 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 7 333 2 50/1/2 
Fax: +256 41 4 286 123  
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  DUS 1687 -7: 2017  
© UNBS 2017  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
Introduction  ................................ ................................ ................................ ................................ .........................  v 
1 Scope  ................................ ................................ ................................ ................................ ......................  7 
2 Normative references  ................................ ................................ ................................ ............................  7 
3 Definitions  ................................ ................................ ................................ ................................ ..............  7 
4 Requirements  ................................ ................................ ................................ ................................ .........  8 
4.1 General  ................................ ................................ ................................ ................................ ...................  8 
4.2 Type  ................................ ................................ ................................ ................................ ........................  8 
4.3 Fibre composition  ................................ ................................ ................................ ................................ . 8 
4.4 Size designation  ................................ ................................ ................................ ................................ .... 8 
4.5 Elastic splicing  ................................ ................................ ................................ ................................ ...... 8 
4.6 Colour  ................................ ................................ ................................ ................................ .....................  9 
4.7 Toe closure  ................................ ................................ ................................ ................................ ............  9 
4.8 Constructional requirements  ................................ ................................ ................................ ...............  9 
4.9 Performance requirements  ................................ ................................ ................................ .................  10 
5 Packing, care -labelling and marking  ................................ ................................ ................................ . 10 
5.1 Packing  ................................ ................................ ................................ ................................ .................  10 
5.2 Care -labelling  ................................ ................................ ................................ ................................ ....... 10 
5.3 Marking  ................................ ................................ ................................ ................................ .................  10 
5.3.1  Knee -high stockings and ankle socks  ................................ ................................ ..............................  10 
5.3.2  Containers  ................................ ................................ ................................ ................................ ............  11 
5.3.3  Additional marking  ................................ ................................ ................................ ..............................  11 
6 Inspection and methods of t est ................................ ................................ ................................ .........  11 
6.1 Inspection  ................................ ................................ ................................ ................................ .............  11 
6.2 Conditioning and sequence of testing  ................................ ................................ ..............................  11 
6.3 Mass per ten pairs  ................................ ................................ ................................ ...............................  11 
6.4 Length of rib top  ................................ ................................ ................................ ................................ .. 12 
6.5 Depth of elastic splicing  ................................ ................................ ................................ .....................  12 
6.6 Size designation  ................................ ................................ ................................ ................................ .. 12 
6.6.1  Apparatus  ................................ ................................ ................................ ................................ .............  12 
6.6.2  Procedure  ................................ ................................ ................................ ................................ .............  12 
6.7 Shrinkage  ................................ ................................ ................................ ................................ .............  12 
6.8 Fibre composition  ................................ ................................ ................................ ...............................  12 
6.9 Colour fastness to light  ................................ ................................ ................................ ......................  12 
6.10  Colour fastness to perspiration  ................................ ................................ ................................ .........  12 
6.11  Colour fastness to washing  ................................ ................................ ................................ ...............  12 
Annex  A  (normative)  Notes to purchasers  ................................ ................................ ................................ .. 13 
Annex  B (normative)  Quality evaluation of knee -high stockings and ankle socks  ................................ .. 14 
B.1 Quality verification  ................................ ................................ ................................ ..............................  14 
B.2.1  Definitions  ................................ ................................ ................................ ................................ ............  14 
B.2.2  Sampling  ................................ ................................ ................................ ................................ ..............  14 
B.2.3  Criteria of compliance  ................................ ................................ ................................ .........................  15 
 DUS 1687 -7: 2017  
iv © UNBS 2017  – 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 th e 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 
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 comme nts. 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 7, Textile, Leath er, Paper and Related 
Products , Subcommittee SC 1, Textile and Related  products . 
DUS 1687  consists of the following parts, under the general  title School Clothing :  
Part 1: General  requirements for school clothing.  
Part 2: Blazers.  
Part 3: Trousers  and sho rts. 
Part 4: Shirts.  
Part 5 : Dresses, tunics  and gyms.  
Part 6: Girls'  slacks and  skirts.  
Part 7: Knee -high stockings and  ankle socks.  
Part 8 : Jerseys and  cardigans.  
Part 9 : Briefs.  
Part 10 : Tracksuits.  
Part 11 : Athletic  wear.  DUS 1687 -7: 2017  
© UNBS 2017  – All rights reserved  v 
 Introduction  
NOTE  
a) requirement s that must be specified by the purchaser are listed in Annex A; and  
b) guidance on the verification of the quality of knee -high stockings and ankle socks and a sampling plan 
that could be used to assess compliance with this part of DUS 1687 of a lot of knee -high stockings or 
ankle socks are given in Annex B  
 DUS  1687 -7: 2017  
vii  
 School Clothing  — Part 7: Knee -high stockings and ankle socks  
1 Scope   
This part of DUS 1687 covers the requirements for two types of knee -high stockings and two types of ankle 
socks for school wear.  
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 late st edition of the referenced document (including any amendments) applies.  
US ISO 105 -B02, Textiles — Tests for colour fastness — Part B02: Colour fastness to artificial light: Xenon 
arc fading lamp test  
US ISO 105 -C10, Textiles — Tests for colour fastness — Part C10: Colour fastness to washing with soap or 
soap and soda  
US ISO 105 -E04, Textiles — Tests for colour fastness — Part E04: Colour fastness to perspiration  
US ISO 2419 , Leather — Physical and mechanical tests — Sample preparation and conditioning  
US ISO 3758 , Textiles -- Care labelling code using symbols  
US ISO 5077 , Textiles -- Determination of dimensional change in washing and drying  
US ISO 9001, Quality management systems — Requirements (3 rd edition)  
DUS 1687 -1, School clothing — Part 1: General r equirements for school clothing  
3 Definitions  
For the purposes of this part of DUS 1687 the definitions given in DUS 1687 -1 and the following definitions 
shall apply:  
automatic toe closure  
an acceptable and approved method, other than linking, of effecting  closure of the toe and in step pieces of 
knee -high stockings or of ankle socks  
linking  
a method of joining the toe and in step pieces of knee -high stockings or of ankle socks by a chain stitch 
(single or double) that passes through adjacent loops of the s ame knitted course  
nominal  
subject to the tolerances normal to good  manufacturing practice  
size designation  
the length range, in millimetres, of the foot of the intended wearer   
viii © UNBS 2017  – All rights reserved  
 Acceptable  
Acceptable to the authority administering  this standard,  or to the parties  concluding  the purchase  contract, as 
relevant  
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  
4 Requirements  
4.1 General  
The kn ee-high stockings and ankle socks shall have been made in accord ance with good workmanship  and 
shall be of uniform and acceptable make, colour(s), finish and, when applicable, design. They shall be 
acceptably paired and free from defects that impair their appearance or may impair their serviceability (or 
both).  
4.2 Type  
Knee -high stockings and  ankle socks shall be of  one of the  following  types, as  required:  
Type KH . Knee -high stockings, other than  stretch type  
Type KHS . Knee -high stockings, stretch  type 
Type A. Ankle socks, other  than stretch  type.  
Type AS . Ankle socks, stretch type.  
4.3 Fibre  composition  
The nominal  fibre composition  of the knee -high stockings  and ankle  socks,  excluding  the elastic  splicing  
(where  applicable),  shall be as required  and as stated,  and the actual  content  of each  constituent  fibre,  
determined  in accordance  with 6.8, shall,  subject  to a tolerance  of ± 5 %, conform  to the stated  content.  
4.4 Size designation  
4.4.1  The size designation shall be  one of the following,  as required:  
115-135, 140 -160, 165 -185,190 -225, 230 -255 and 260 -280 
4.4.2  When  knee -high stockings  or ankle  socks  are tested  in accordance  with 6.6, the size of each  foot and 
leg shall be  deemed correct if  
a) its volume  and shape  are in close  harmony  with those  of the appro priate  size-board  without  excessive 
tightness or looseness being present;  
b) a straight line extension of  the gore(searcher) line bisects the heel  reference  mark; and  
c) the top of the knee -high stocking or ankle  sock is  between the appropriate  datum lines.  
4.5 Elastic  splicing  
The elastic  splicing  in a knee -high stocking  shall start two-thirds  of the way down  the rib top and shall continue  
in the direction  of manufacture  for the appropriate  distance given in table  1.  
© UNBS 2017  – All rights reserved  ix 
 4.6 Colour  
The colour  of the knee -high stocki ngs and ankle  socks  and, when  so required,  the colour(s)  of stripes  
incorporated  in their rib tops,  shall be an acceptable  match  to the required  colour(s)  as agreed upon  between 
the purchaser  and the supplier  
4.7 Toe closure  
The toe shall  be closed  by link ing or  by automatic toe  closure, as  required.  In the case of  
a) closure  by linking,  the ends  of the linking  yarns  shall extend  not less than 12mm  and not more  than 25 
mm beyond the ends of the toe linking;  and 
b) automatic  toe closure,  the seam  shall be sufficie ntly extensible  to prevent  cracking  and undue  
shrinkage, and acceptably  flat to  prevent discomfort.  
4.8 Constructional  requirements  
The knee -high stockings  and ankle  socks  shall comply  with the requirements  given  in table  1, appropriate to  
the type and  size designation  required.  
Table  1— Constructional  requirements  
1 2 3 4 5 6 7 
Property  Size 
designation  Requirements  Test Method 
sub section  Type KH  Type KHS  Type A  Type AS  
Mass per 10 pairs, g, 
min  
115-135 
140-160 
165-185 
190-225 
230-255 
260-280  
- 
370 
410 
510 
630 
730 
  
- 
270 
320 
410 
500 
570  
- 
175 
215 
260 
310 
330  
120 
145 
185 
225 
240 
- 6.3 
Nominal length of rib 
top, mm  
  
115-135 
140-160 
165-185 
190-225 
230-255 
260-280  
- 
120 
120 
120 
160 
160  
60 
60 
80 
80 
100 
100 6.4 
Depth of  elastic 
splicing, mm, mi n.  
115-135 
140-160 
165-185 
190-225 
230-255  
- 
20 
20 
20 
30  
- 
- 
- 
- 
- 6.5  
x © UNBS 2017  – All rights reserved  
 260-280 30 - 
 
 
 
4.9 Performance requirements  
The knee -high stockings  and ankle  socks  shall comply  with the performance  requirements  given  in table  2. 
5 Packing,  care-labelling  and marking  
5.1 Packing  
Pairs of knee -high stockings  and ankle  socks  of the same type, size and colour(s)  shall be acceptably  
packaged  and packed.  Unless  otherwise  required,  only knee -high stockings  or ankle  socks of the same type 
and colour(s), but not necessa rily of the same size, shall be packed together in a bulk container. The knee -high 
stockings and ankle socks shall be delivered in a clean and commercially dry condition  
Table 2— Performance requirements  
1 2 3 
Property  Requirement  Test method sub section  
Shrinkage, %, max  
Length of foot  
Length of leg   
5 
5 6.7 
Colour fastness to  
a) Light, rating, min  
b) Perspiration, rating, min  
Change in colour  
Staining of transfer cloths  
c) Washing rating, min  
Change in colour  
Staining of transfer cloths   
5 
 
4 
4 
 
4 
4  
6.9 
6.10 
 
 
6.11 
 
5.2 Care -labelling  
Each  pair of knee -high stockings  and ankle  socks  shall have  a printed  adhesive  label  attached  that provides 
appropriate  care instructions in accordance  with US ISO 3758 . 
5.3 Marking  
5.3.1  Knee -high  stockings  and ankle  socks  
The following  information  shall appear  in legible  and indelible  marking  either  on an adhesive  label  (see 5.2) 
attached  to each  pair of knee -high stockings  and ankle  socks  or in transfer  printing  on one sole of each pair  of 
knee -high stockings and ankle  socks, o r both:   
© UNBS 2017  – All rights reserved  xi 
 a) the manufacturer's name  or trade  mark  or both;  
b) the nominal over  all composition, e.g."45 % polyester,  25 % rayon, 30 % nylon";  
c) the size designation; and  
d) country of origin.  
5.3.2  Containers  
The following  information  shall appear  in legible  and indel ible marking  on the outside  of each  bulk container 
and shall be visible  when the containers  are stacked:  
a) the information specified  in 5.3.1(a)  and (b);  
b) a description  of the contents,  e.g. "Knee -high stockings, type  KH"; 
c) the quantity(in pairs) per  size; 
d) the colour(s);  
e) the gross mass, in kilograms;  
f) the order or contract number; and  
g) country of origin  
5.3.3  Additional  marking  
When  so required,  knee -high stockings  and ankle  socks  or containers  (or both)  shall bear information 
additional to that specified  in 5.3.1 and  5.3.2. 
6 Inspection and  methods of  test 
6.1 Inspection  
After  inspecting  the sample  for compliance  with the requirements  of section  5, inspect  all the knee -high 
stockings  or ankle  socks  in the sample  for compliance  with the requirements  given  in 4.1, 3.2 and 4.4-3.7 
(inclusive).  
6.2 Conditioning  and sequence  of testing  
Condition  (in accordance  with US ISO 2419 ) the knee -high stockings  or ankle  socks  in the sample  for testing  
and then divide  them  into three  sets,  each  set consisting  of an equal  (or as nearly  equal  as possible)  number  
of pairs  of knee -high stockings  or ankle  socks.  Use a different  set for each  of the following groups of  tests:  
Group 1: 6 .3, 6.4, 6 .5 and 6 .6 
Group 2: 6 .7 
Group 3: 6.8, 6.9, 6.10 and 6 .11 
6.3 Mass per ten pairs  
For each  size designation,  determine,  to an accuracy  of 1 part in 500, the mass  of each  pair of knee -high 
stockings or ankle socks  and calculate the mass per  10 pairs in  grams.   
xii © UNBS 2017  – All rights reserved  
 6.4 Length  of rib top 
Use US ISO 5077  
6.5 Depth  of elastic  splicing  
Use US ISO 5077  
6.6 Size designation  
6.6.1  Apparatus  
A set of size-boards  conforming  in volume,  shape  and markings  to the master  set  
6.6.2  Procedure  
So fit each  knee -high stocking  or ankle  sock in turn on the appropriate  size-board  that all avoidable  wrinkles  
are eliminated  without the use of excessive  force. Turn the rib top over at a point  halfway  between its start  and 
finish, and check for  compliance  with 4.4.2 
6.7 Shrinkage  
Use US ISO 5077 , procedure  D1, drying  procedure  F. Condition  and calculate,  separately,  the mean  
dimens ional  changes  in the length  of the foot and the length  of the leg in the case  of knee -high stockings, and 
of the length  of the foot  only in the  case of  ankle  socks.  
6.8 Fibre  composition  
Determine by  microscopical examination  and chemical analysis.  
6.9 Colour fastness  to light  
Use US ISO  105-B02. 
6.10 Colour  fastness  to perspiration  
Use US ISO  105-E04.  
6.11 Colour  fastness  to washing  
Use US ISO  105-C10.   
© UNBS 2017  – All rights reserved  xiii 
 Annex  A  
(normative)  
 
Notes to purchasers  
The following  requirements  must be  specified in tender  invitati ons and in each order  or contract:  
a) the type (see 4.2); 
b) the fibre composition  (see 4.3); 
c) the size(s ) required  (see 4.4.1);  
d) the colour and,  when relevant,  the colour(s) of stripes incorporated  in the rib top  (see 4.6); 
e) the method  of toe closure  (see 4.7); and 
f) additional marking,  if required (see  5.3.3).  
 
 
 
 
 
 
 
 
 
 
  
xiv © UNBS 2017  – All rights reserved  
 Annex  B 
(normative)  
 
Quality evaluation of knee -high stockings and ankle socks  
B.1 Quality verification  
B.1.1  When a purchaser requires ongoing verification of the quality of knee -high stockings and  ankle socks, 
it is suggested that, instead of concentrating solely on evaluation of the final product, he also directs his 
attention to the manufacturer’s quality system. In this connect ion it should be noted that US ISO  9001 covers 
the provision of an in tegrated quality system.  
B.1.2  If the knee -high stockings or ankle socks do not bear the certification mark and no information about 
the implementation of quality control or testing during manufacture is available to help in assessing the quality 
of a lot , and a purchaser wishes to establish by inspection and testing of samples of the final product whether 
a lot (as defined in B.2.1) of the knee -high stockings or ankle socks complies with this part of WDUS 1687, the 
sampling plan given in B.2 can be applie d. 
B.2 Assessment of  compliance with  this part of WDUS 1687  
B.2.1  Definitions  
acceptable quality  level  AQL  
the maximum  number  of defects  per hundred  units  that, for the purpose  of sampling  and inspection,  can be 
considered  satisfactory as  process average  
defective  
a knee -high stocking  or an ankle  sock,  a component  of either,  a test sample,  a test specimen  or a set of test 
specimens  whose  average  property  has been  determined,  that fails in one or more  respects to comply  with 
the relevant  requirements of this  part of WDUS 1687  
lot 
not less than 151 pairs  and not more  than 10000  pairs  of knee -high stockings  or ankle  socks  of the same  
material(s),  colour(s),  components,  style and size designation,  made  by one manufacturer,  and submitted at  
any one time  for inspe ction and testing  
B.2.2  Sampling  
Use the following  sampling  procedure  when  determining  whether  a lot complies  with this part of WDUS 1687 , 
and deem the samples so taken to represent the lot for the respective  properties:  
a) Sample  for inspection . From  the lot take at random  the number  of pairs  of knee -high stockings  or 
ankle  socks  given  in column 2  of table  B.1, relative to the appropriate  lot size shown  in column 1.  
b) Sample for testing . After inspection  of the sample  taken in  accordance with (a)  above, take fr om it at 
random  the appropriate  number  of pairs  of knee -high stockings  or ankle  socks  given  in column 3 of 
table  B.1 
 
  
© UNBS 2017  – All rights reserved  xv 
 Table B.1 — Sample sizes  
1 2 3 
Lot size  
Pairs of knee -high stockings 
or ankle socks  Sample for inspection  
Pairs of knee -high stockings 
or ankle socks  Sample for testing  
Pairs of knee -high stockings or 
ankle socks  
 
151-280 
281-500 
501-1200  
1201 -3200  
3201 -10000   
32 
50 
80 
125 
200  
9 
12 
12 
18 
18 
 
B.2.3  Criteria of compliance  
Deem the lot to comply with the applicable requirements of this par t of WDUS 1687 if,  
a) on inspection of the sample taken in accordance with B.2.2(a), no defective is found; and  
b) on testing of the sample taken in accordance with B.2.2(b), no defective is found.  
  
xvi © UNBS 2017  – 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 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 National Bureau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to th at standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 DUS 16 87-7: 2017    
 
ICS nn.nnn.nn  
Price based on nn pages  
© UNBS 2017 – All rights  reserved