DRAFT UGANDA STANDARD  
  DUS 2260 -1 
First  Edition  
2020 -mm-dd 
 
 
 Reference number  
DUS 2260 -1: 2020 
© UNBS 2020   
  
Textiles  — Cotton yarn  — Part 1: Weaving  
 DUS 2260 -1: 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 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written 
permissi on 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 4 333 2 50/1/2/3  
Fax: +256 41 4 286 123  
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  DUS 2260 -1:2020  
© UNBS 2020  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Requirements  ................................ ................................ ................................ ................................ .........  3 
4.1 General  ................................ ................................ ................................ ................................ ...................  3 
4.1.1  Yarn Count  ................................ ................................ ................................ ................................ .............  3 
4.1.2  Yarn twist  ................................ ................................ ................................ ................................ ...............  3 
4.1.3  Moisture regain  ................................ ................................ ................................ ................................ ...... 3 
4.1.4  Yarn appearance  ................................ ................................ ................................ ................................ .... 3 
4.1.5  Freedom from defects  ................................ ................................ ................................ ...........................  3 
4.2 Ring spun single yarn  ................................ ................................ ................................ ...........................  4 
4.3 Rotor spun single yarn  ................................ ................................ ................................ .........................  5 
4.4 Doubled yarn  ................................ ................................ ................................ ................................ ..........  6 
4.5 Yarn intended for handloom weaving  ................................ ................................ ................................ . 6 
5 Labelling  ................................ ................................ ................................ ................................ .................  7 
6 Packaging  ................................ ................................ ................................ ................................ ...............  8 
7 Sampling  ................................ ................................ ................................ ................................ ................  8 
Annex A  (normative) Calculation of count strength product (CSP)  ................................ ...........................  10 
Bibliography  ................................ ................................ ................................ ................................ ......................  11 
 DUS 2260 -1: 2020  
iv © UNBS 2020  – 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 Uganda , as amended .  UNBS is mandated t o 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 govern ment, 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 re commending 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, Textiles, Leather, Paper 
and related p roducts , Subcommittee SC 1, Textiles and related products . 
WDUS 2260  consists of the following parts, under the general title Textiles — Cotton yarn  
  Part 1: Weaving   
  Part 2: Hosiery   DRAFT UGANDA STANDARD  DUS 2260 -1: 2020  
 
© UNBS 2020  – All rights reserved  1 
 Textiles — Cotton yarn — Part 1: Weaving  
1 Scope   
This D raft standar d specifies requirements  of spun (single and doubled) grey cotton yarn  for use in weaving.  
This standard does not cover yarn  produced from blends of cotton with man -made fibres or any other fibre.  
2 Normative references   
The following referenced documents are referred to in the t ext 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.  
ASTM D2255, Standard  test method  for grading  spun  yarns  for appearance   
ASTM D5647, Standard  guide  for measuring  hairiness  of yarns  by the photo -electric  apparatus  
ISO 2, Textiles  — Designation  of the direction  of twist in yarns  and related  products   
ISO 20 61, Textiles  — Determination  of twist in yarns  — Direct  counting  method   
ISO 2062, Textiles  — Yarns  from packages  — Determination  of single -end breaking  force  and elongation  at  
break  using  constant  rate of extension  (CRE)  tester   
ISO 6741 -1, Textiles  — Fibres and yarns  — Determination  of commercial  mass  of consignments  — Part 1:  
Mass  determination  and calculations   
ISO 6939, Textiles  — Yarns  from packages  —Method   of  test  for  breaking   strength   of  yarn  by  the  skein   
method  
ISO 16549, Textiles  — Unevenness  of textile  strands  — Capacitance  method   
ISO 17202, Textiles  — Determination  of twist in single  spun  yarns  — Untwist/retwist  method   
US ISO 2060 , Textiles  — Yarn  from packages  — Determination  of linear  density  (mass  per unit length)  by the 
skein  method   
3 Terms and definitions   
For the purposes of this document, the following terms and definitions 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   
2 © UNBS 2020  – All rights reserved  
 3.1  
cotton count (Ne)  
number of hanks (each measuring 768 m or 840 yd) in 453.6 g (or 1 lb)  
3.2  
count lea strength product (CSP)  
product of the lea breaking load in pounds and cotton count  
3.3  
grey cotton yarn  
yarn as it leaves  the spinning frame without any bleaching , dyeing or finishing treatment  
Note 1 to entry: The yarn may be waxed or unwaxed  
3.4  
hairiness index  
total length of protruding fibres in the yarn in cm with reference to the sensing length of 1 cm yarn  
3.5  
lea 
continuous length of yarn measuring 109.73 m (120 yd) in the form of a coil having 80 wraps wound on a reel 
of 1.37 m (1.5 yd) girth  
3.6  
breaking load   
maximum load (or force) applied to a specimen in a tensile test carried to rupture  
3.7  
single yarn ten acity  
tensile stress of a single strand at rupture expressed as force per unit linear density of the unstrained 
specimen expressed usually as cN/tex (gf/tex).  
3.8  
tex  
number of grams per kilometre of yarn  
3.9  
ring spun yarn  
yarn spun on a system employi ng flat top cards and roller drafting assemblies with or without aprons on 
drawing, roving and ring frames  
3.10  
rotor spun yarn  
yarn spun on an open -end spinning machine wherein the individualization and assembling of fibres are done 
and the real twist is  effected by a rotor  
3.11  
virgin cotton  
consisting of more than 65 percent raw short staple cotton and the rest superior comber noil  
3.12  
waste cotton  
consisting of cotton from yellow pickings, blowroom droppings, flat strips  and comber noil mixed in sui table 
proportions  
Note 1 to entry: It may include short staple virgin cotton to the extent of 35 percent  DUS 2260 -1: 2020  
© UNBS 2020  – All rights reserved  3 
 3.13 
doubled y arn  
yarn in which two or more single ya rns are twisted together in one or two operations.  
4 Requirements  
4.1 General  
4.1.1  Yarn Count  
4.1.1.1  The average resultant count of yarn shall be as agreed between the purchaser and manufacturer.  
4.1.1.2  A tolerance of ± 3.0 percent shall be permissible on the count of yarn intended for shuttless and 
auto looms  
4.1.1.3  A tolerance of ± 4.0 percent shall be permissible on the count of yarn intended for handlooms  
4.1.1.4  Yarn count shall be determined in accordance with US ISO 2060 . 
4.1.2  Yarn twist  
4.1.2.1  The number of turns per unit length shall be determined in accordance with ISO 2061 or ISO 
17202 . The direction for twist shall be indicated by the capital letter “S” or “Z” as specified in ISO 2.  
4.1.2.2  The average twist shall be within ± 10 percent and ± 5 percent of the specified  value for single 
spun yarn and doubled yarn respectively  
4.1.3  Moisture regain  
Unless otherwise agreed to between the purchaser and manufacturer, the moisture regain shall not exceed 
8.5 percent when determined in accordance with ISO  6741 -1. 
4.1.4  Yarn appearance  
When determined in accordance with ASTM  D2255 , the average  black board appearance (5 boards) shall be 
at least of Grade D. In case of yarn counts coarser than 98 tex (6s), this shall be as agreed to between the 
purchaser and the manufacturer.  
4.1.5  Freedom from defects  
The yarn on cones/cheeses shall be free from  the following defects:  
a) stitches of more than 2.5 cm in length at the base;  
b) excessive stitches at the nose;  
c) soft cones or cheeses;  
d) prominent stains inclusive of chalk and other markings;  
e) cut threads;  
f) absence of tail end where it is required and the length of the tail -end should not be less than 30 cm;  
g) entanglement;   
4 © UNBS 2020  – All rights reserved  
 h) presence of hard waste;  
i) ribbon formation;  
j) drum cuts;  
k) count mix up.  
4.2 Ring spun s ingle yarn  
4.2.1 The ring spun single grey cotton carded or combed yarn  shall comply with the requirements given in 
Table 1 or Table 2 respectively.  
4.2.2  When determined in accordance with ISO 6939, t he coefficient of variation of lea breaking load shall 
not exceed 10.0 percent  
Table 1 — Performance requirements of c arded ring spun single yarn  
Parameter  Requirement s 
Test 
Method  ≥ 59 tex 
(≤ 10s)  36.9 tex – 
53.7 tex 
(10s – 
16s) 29.5 tex – 
34.7 tex 
(17s – 
20s) 20.3 tex – 
28.1 tex 
(21s – 
29s) 15.1 tex – 
19.7 tex 
(30s – 
39s) 10.9 tex – 
14.8 tex 
(40s – 
54s) 10.9 tex 
(54s) and 
finer 
Count CV, %, Max.  2.00 2.20 2.20 2.20 2.20 2.20 2.50 US ISO 
2060  
CSP, Min.  2 000  2 100  2 200  2 200  2 300  2 400  2 400  Annex A  
Yarn Tenacity 
cN/tex, Min.  13.5 14.0 14.5 15.0 15.5 16.5 17.0 ISO 2062  
Yarn Tenacity CV, 
%, Max.  9.0 9.0 9.5 10.0 10.5 11.0 11.5 ISO 2062  
Breaking 
elongation, %, 
Max. 5.2 ISO 2062  
Unevenness, %, 
Max. 10.50  12.00  12.00  12.50  12.50  14.00  15.50  ISO 
16549  
Hairiness Index , 
Max.  7.0 6.5 6.0 5.5 5.2 4.8 4.5 ASTM 
D5647  
Imperfections/Km . 
Thin 
Thick  
Neps  
Total   
3 
100 
50 
153  
4 
120 
60 
184  
4 
140 
70 
214  
20 
200 
280 
500  
50 
300 
425 
775  
50 
400 
650 
1 100   
200 
700 
1 100  
2 000  ISO 
16549  
NOTE  The unevenness percentage (U %) and the imperfections per Km of the yarn on packages shall not exceed 
the values given in Table 1 when tested at a speed of 400 m/min and at sensitivity of -50%, +50% and +200% for thin 
places, thick places and neps respectively  
Table 2 — Performance requirements of combed ring spun single yarn  
Parameter  
 Requirements  
Test 
Method  ≥ 59 tex 
(≤ 10s)  36.9 – 
53.7 tex 
(10s – 29.5 – 
34.7 tex 
(17s – 20.3 – 
28.1 tex 
(21s – 15.1 – 
19.7 tex 
(30s – 10.9 – 
14.8 tex 
(40s – 7.9 - 
10.7 tex 
(55s – 7.8 tex 
(75s) 
and DUS 2260 -1: 2020  
© UNBS 2020  – All rights reserved  5 
 16s) 20s) 29s) 39s) 54s) 74s) finer 
Count CV, %, Max.  1.80 2.00 2.00 2.00 2.00 2.00 2.50 2.50 US ISO 
2060  
CSP, Min.  2 300 2 400 2 400 2 500 2 500 2 600 2 700 2 650  Annex A  
Yarn Tenacity 
cN/tex, Min.  14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 ISO 2062  
Yarn Tenacity CV, 
%, Max.  8.5 8.5 8.5 9.0 9.0 10.0 10.0 10.0 ISO 2062  
Breaking 
elongat ion, %, Max  5.0 4.7 4.5 4.3 ISO 2062  
Unevenness, %, 
Max 8.50 9.00 9.00 10.00  11.00  12.50  13.00  14.00  ISO 
16549  
Hairiness Index  6.0 5.8 5.5 5.0 4.7 4.2 3.3 2.9 ASTM 
D5647  
Imperfections/Km  
Thin 
Thick  
Neps  
Total   
0 
5 
7 
12  
0 
8 
17 
25  
0 
10 
20 
30  
0 
18 
32 
50  
1 
26 
53 
80  
5 
45 
100 
150  
15 
80 
165 
260  
40 
140 
270 
450 ISO 
16549  
NOTE  The unevenness percentage (U %) and the imperfections per Km of the yarn on packages shall not ex ceed the 
values given in Table 2  when tested at a speed of 400 m/min and at sensitivi ty of -50%, +50% and +200% for thin places, 
thick places and neps respectively  
4.3 Rotor spun single yarn  
The rotor spun grey cotton yarn shall comply with t he requirements given in Table 3 or Table 4   
Table  3 — Performance requirements of r otor spun single yarn (Waste Cotton)   
Parameter  Requirements  Test 
Method  
≥ 118 tex 
(≤ 5s) 59.0 – 
98.4 tex 
(6s – 10s) 36.9 – 
53.7 tex 
(11s – 
16s) 29.5 – 
34.7 tex 
(17s – 
20s) 28.1 tex 
(21s)  
Count CV, %, Max.  2.00 2.20 2.20 2.50 2.50 US ISO 
2060  
CSP, Min.  1 600  1 500  1 500  1 400  1 400  Annex A  
Lea Breaking Load 
CV, %, Max.  5.5 6.0 6.0 6.5 6.5 ISO 6939  
Yarn Tenacity 
cN/tex, Min.  9.5 9.0 9.0 8.5 8.5 ISO 2062  
Yarn Tenacity CV, 
%, Max.  11.0 11.0 11.0 11.5 11.5 ISO 2062  
Unevenness, %, 
Max 12.00  12.50  13.00  14.00  14.00  ISO 
16549  
Imperfections/Km  
Thin 
Thick  
Neps   
0 
90 
50  
0 
150 
100  
5 
175 
120  
10 
200 
140  
15 
225 
160 ISO 
16549   
6 © UNBS 2020  – All rights reserved  
 Total  140 250 300 350 400 
NOTE  The unevenness percentage (U %) and the imperfections per Km of the yarn on 
packages shall not exceed the values give n in Table 3 when tested at a speed of 400 m/min and 
at sensitivity of -50%, +50% and +280% for thin places, thick places and neps respectively  
Table  4 — Performance requirements of rotor spun single yarn  (Virgin Cotton)  
Parameter  Requirements  
Test 
Method  ≥ 118 tex 
(≤ 5s) 59.0 – 
98.4 tex 
(6s – 10s) 36.9 – 
53.7 tex 
(11s – 
16s) 29.5 – 
34.7 tex 
(17s – 
20s) 28.1 tex 
(21s)  
Count CV, %, Max.  1.80 2.00 2.00 2.20 2.20 US ISO 
2060  
CSP, Min.  1 800  1 750  1 700  1 650  1 600  Annex A  
Lea Breaking Load 
CV, %, Max.  5.0 5.5 5.5 6.0 6.0 ISO 6939  
Yarn Tenacity 
cN/tex, Min.  10.5 10.0 10.0 9.5 9.5 ISO 2062  
Yarn Tenacity CV, 
%, Max.  10.50  10.50  10.5 11.0 11.0 ISO 2062  
Unevenness, %, 
Max 10.00  10.00  10.50  10.50  12.00  ISO 
16549  
Imperfections/Km  
Thin 
Thick  
Neps  
Total   
0 
30 
15 
45  
2 
35 
28 
65  
5 
50 
40 
95  
10 
60 
60 
130  
15 
75 
85 
175 ISO 
16549  
NOTE  The unevenness percentage (U %) and the imperfections per Km of the yarn on 
packages shall not ex ceed the values given in Table 4  when tested at a speed of 400 m/min and 
at sensitivity  of -50%, +50% and +280% for thin places, thick places and neps respectively  
4.4 Doubled yarn  
4.4.1 The single yarn used for producing doubled yarn shall satisfy th e requirements specified in 4.1  and 
either 4.2 or 4.3.  
4.4.2  The count lea strength product  (CSP) of doubled yarn shall not be less than the value calculated by 
the following relationship:  
 
4.4.3  The coefficient of variation of the lea count shall not exceed 2.0 percent  
4.4.4  The coefficient of variation of the lea breaking load shall not excee d 7.0 percent.  
4.5 Yarn  intended for handloom weaving  
4.5.1  Yarn  intended for use in handlooms shall conform to the requirements given from 4.1 to 4.4 with 
modifications given in 4.5.2, Table 5 and Table 6  DUS 2260 -1: 2020  
© UNBS 2020  – All rights reserved  7 
 4.5.2  The minimum yarn tenacity shall be 10.8 cN/ tex and 12.5 cN/tex for carded and combed yarn 
respectively.  
Table 5  — Performance require ments of  carded yarns intended for handlooms  
Parameter  Requirements  
Test 
Method  ≥ 98 tex 
(≤ 6s)  37 – 98 
tex (6s – 
16s) 18.5 – 37 
tex (16s – 
32s) 12 – 18.5 
tex (32s – 
50s) 7.9 – 12 
tex (50s – 
75s) 7.9 tex 
(75s ) 
and finer  
CSP, Min.  1 000  1 350  1 700  1 800  2 000  2 000  Annex A  
Unevenness, %, 
Max. 17.5 16.5 15.5 16.5 17.5 17.5 ISO 
1654 9 
Imperfections/Km  
Thin 
Thick  
Neps  
Total   
400 
750 
1 250  
2 400   
340 
600 
950 
1 890   
340 
540 
750 
1 630   
400 
950 
1 500  
2 850   
540 
775 
1 620  
2 935   
540 
775 
1 620  
2 935  ISO 
16549  
NOTE  The unevenness percentage (U %) and the imperfections per Km of the yarn on packages shall not 
exceed the values given in Table 4 when tested at a speed of 400 m/min and at sensitivity of -50%, +50% 
and +200% for thin places, thick places and neps respectively  
Table 6 — Performance requirements of  combed  yarns intended for handlo oms 
Parameter  Requirement  
Test 
Method  ≥ 98 tex 
(≤ 6s)  37 – 98 
tex (6s – 
16s) 18.5 – 37 
tex (16s – 
32s) 12 – 18.5 
tex (32s – 
50s) 7.9 – 12 
tex (50s – 
75s) 7.9 tex 
(75s ) 
and finer  
CSP, Min.  - - 2 000  2 050  2 150  2 250  Annex A  
Unevenness, %, 
Max 14.5 14.5 14.5 13.5 14.5 14.5 ISO 
16549  
Imperfections/Km  
Thin 
Thick  
Neps  
Total   
 
 
 
  
 
 
 
  
60 
375 
500 
935  
60 
315 
375 
750  
95 
315 
375 
785  
125 
375 
435 
935 ISO 
16549  
NOTE  The unevenness percentage (U %) and the imperfections per Km of the yarn on packages shall n ot 
exceed the values given in Table 4 when tested at a speed of 400 m/min and at sensitivity of -50%, +50% 
and +200% for thin places, thick places and neps respectively  
5 Labelling  
5.1  Each cone or cheese of ya rn shall be marked with the following:  
a) produ ct name as “100% cotton ”; 
b) count of yarn in ‘N e’ or ‘tex;’  
c) lot number;  
d) manufacturer’s name, trademark or other means of identification;   
8 © UNBS 2020  – All rights reserved  
 e) spinning method used, e.g. ring or rotor;  
f) individual package size/mass;  
g) end use of yarn, e.g. weaving , knitting or handlo oms weaving (Handloom yarns shall be further 
indicated as made from either ‘VIRGIN’ or ‘WASTE’ cotton) ; 
h) whether carded  (KW)  or combed  (CW) ; 
i) whether waxed or unwaxed;  
j) packaging and storage conditions.  
k) Country of origin  
5.2 Each case containing cones or chee ses shall be marked with the following:  
a) name of material;  
b) count of yarn in ‘Ne’ and/or ‘tex;’  
c) lot number;  
d) manufacturer’s name, trademark or other means of identification;  
e) gross mass of bale or case;  
f) net mass of bale or case;  
g) packaging and storage conditi ons. 
6 Packaging  
Cones or cheeses of yarn shall be packaged in suitable packaging materials which shall protect the product 
from damage during transportation, handling and storage. Cones or cheeses shall be packaged in unit 
packages and thereafter into bul k cases.  
7 Sampling  
7.1 In any consignment, the cases containing ya rn of the same type and of the same nominal count shall 
constitute a lot.  
7.2 Samples shall be drawn from ea ch lot to determine its conformance  with the requirements of the 
standard.  
7.3  Unless otherwise agreed to between the buyer and the seller, the number of cases to be selected from 
a lot sha ll be in accordance with Table 7 . The bales or cases shall be selected at random . 
7.4 In case two or less cases are selected in the sample, at leas t 10 cones or cheeses shall be drawn at 
random from each of the selected case. However, in case three or more cases are selected in the sample, at 
least five cones or cheeses shall be drawn at random from each of the selected case.  DUS 2260 -1: 2020  
© UNBS 2020  – All rights reserved  9 
  
Table 7 — Sampling  
Lot Size Sample Size  
Up to 3  1 
4 – 10 2 
11 – 30 3 
31 – 50 5 
Over 50  8 
  
10 © UNBS 2020  – All rights reserved  
 Annex A 
 
(normative)  
Calculation of count strength product (CSP)  
CSP is obtained by the following relationship:  
 
Where;  
The breaking load is determined in accordance with ISO 6939  
Cotton count (Ne) is determined in accordance with US ISO 2060  DUS 2260 -1: 2020  
© UNBS 2020  – All rights reserved  11 
 Bibliography  
[1] IS 171:1993, Textiles — Ring spun grey cotton y arn for weaving — Specification   
[2] IS 13683:2006, Textiles — Ring spun grey cotton yarn — Specification  
[3] IS 13684:2006, Textil es — Rotor spun grey cotton yarn — Specification  
 DUS 2260 -1: 2020  
© UNBS 2020  – All rights reserved  13 
 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 conjun ction 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 t he 
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 2260 -1: 2020    
 
ICS 59.080.20  
Price based on nn pages  
© UNBS 2020 – All rights reserved