DRAFT UGANDA STANDARD  
  DUS 2150  
First  Edition  
2020 -mm-dd 
 
 
 Reference number  
DUS 2150 : 2020 
© UNBS 2020   
  
Textiles — Acrylic yarn — Specification  
 DUS 2150 : 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 
permissio n from UNBS.  
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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  
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 DUS 2150 :2020  
© UNBS 2020  – All rights reserved  iii 
 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 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 gover nment, 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 r ecommending 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 07, Textiles, Leather, Paper 
and related products, Subcommittee S C 1, Textiles and related products.  
 DRAFT UGANDA STANDARD  DUS 2150 : 2020  
 
© UNBS 2020  – All rights reserved  1 
 Textiles — Acrylic yarn — Specification  
1 Scope   
This Draft Uganda Standard specifies the requirements, test methods and sampling of acrylic yarn to be used 
for machine weaving, hand weaving, hand knitting and machine knitting.  
2 Normative references   
The following referenced documents are 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 any amendments) applies.  
ASTM D5647, Standard guide for measuring hairiness of yarns by the photo -electric apparatus  
FDUS ISO 1833 -12, Textiles — Quantitative chemical analysis — Part 12: M ixtures of acrylic, certain 
modacrylics, certain chlorofibres, certain elastane fibres with certain other fibres (method using 
dimethylformamide)  
ISO 16373 -2, Textiles — Dyestuffs — Part 2: General method for the determination of extractable dyestuffs 
including allergenic and carcinogenic dyestuffs (method using pyridine -water)  
ISO 16373 -3, Textiles — Dyestuffs — Part 3: Method for determination of certain carcinogenic dyestuffs 
(method using triethylamine/methanol)  
ISO 16549, Textiles — Unevenness of text ile strands — Capacitance method  
ISO 17202, Textiles — Determination of twist in single spun yarns — Untwist/retwist method   
ISO 2, Textiles — Designation of the direction of twist in yarns and related products   
ISO 2061, 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 comm ercial mass of consignments — Part 1: 
Mass determination and calculations  
US ISO 105 -B02, Textiles — Tests for colour fastness — Part B02: Colour fastness to artificial light: Xenon 
arc fading lamp test  
US ISO 105 -C 10, Textiles — Tests for colour fastness  — Part C10: Colour fastness to washing with soap or 
soap and soda  
US ISO 1833 -1, Textiles – Quantitative chemical analysis – Part 1: General principles of testing  
US ISO 2060, Textiles — Yarn from packages — Determination of linear density (mass per unit length) by the 
skein method   
2 © UNBS 2020  – All rights reserved  
 US ISO 3758 , Textiles — Care labelling code using symbols  
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 standardi zation at the following addresses:  
— ISO Online browsing platform: available at http://www.iso.org/obp  
3.1  
unevenness  
variation of linear density along the length of a continuous strand of yarns . 
3.2  
english  count (Ne)  
number of hanks (each measuring 76 8 m or 840 yd) in 453.6 g (or 1 lb)  
3.3  
grey 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 ya rn 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  
tex  
number of grams per kilometre of yarn  
4 Requirements  
4.1 General requirements   
4.1.1  Fibre composition  
The fibre composition shall be 100 % acrylic fibres when tested in accordance with FDUS ISO 183 3-12 
4.1.2  Yarn count  
4.1.2 .1 The average resultant count of yarn shall be as agreed between the purchaser and the 
manufacturer.  
4.1.2 .2 A tolerance of ± 2 .0 percent shall be p ermissible on the count of yarn  DUS 2150 : 2020  
© UNBS 2020  – All rights reserved  3 
 4.1.2.3  Yarn count shall be determined in accord ance with US ISO 2060.  
4.1.3  Yarn twist  
4.1.3.1  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.  
4.1.3 .2 The coefficient of variation of twist shall be within ± 5 percent of the specified value  
4.1.4  Moisture regain  
Unless otherwise agreed to between the purchaser and manufacturer, the mois ture regain shall not exceed 2  
percent when determined in accordance wit h ISO 6741 -1. 
4.1.5  Restricted colorants  
The colorants  used on the acrylic yarns shall be free from those that are listed in ISO 16373 -2, and ISO 
16373 -3  
4.1.6  Freedom from defects  
The yarn on cones/cheeses shall be free from the following defects:  
a) stitch es 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;  
h) presence of hard waste;  
i) ribbon formation;  
j) drum cuts;  
k) count mix up.  
4.2 Specific requirements  
4.2.1  Breaking tenacity  
When tested in accordance with ISO 2062 , the minimum breaking tenacity of yarn shall be as follows :  
a) grey ya rn intended for weaving: 16.5 g/tex  
b) hosiery grey yarn: 13.0 g/tex  
c) dyed yarn intended for weaving: 13.0 g/tex   
4 © UNBS 2020  – All rights reserved  
 d) dyed hosiery yarn: 10.0 g/tex  
4.2.2  Elongation and Evenness  
Acrylic yarn shall meet the requirem ents given in  Table 1 . 
Table 1 — Specific r equireme nts of acrylic yarn  
Parameter  Requirement  Test Method  
≤ 10s  10s – 20 s 20s – 30 s 30s and finer  
Lea count CV, %, Max.  1.5 1.5 1.4 1.3 US ISO 2060  
Breaking elongation, %, Max  15.0 15.5 16.0 16.5 ISO 2062  
Unevenness, %, Max  8.7 10.7 12.0 12.0 ISO 16549  
Hairiness Index  10.0 10.0 8.0 7.5 ASTM D5647  
Imperfec tions/Km  
Thin 
Thick  
Neps  
Total   
4.5 
3.0 
6.5 
14.0  
4.5 
3.0 
6.5 
14.0  
6.0 
4.0 
13.0 
23.0  
6.5 
8.0 
22.5 
37.0  
 
ISO 16549  
Colour fastness*  
Light  
Washing   
5 
4  
US ISO 105 -B02 
US ISO 105 -C 10  
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 5 m/min and at sensitivity of -50%, +50% and +200% for thin places, 
thick places and neps respectively  
*dyed acrylic yarn  
 
4.5 Package mass  
The mass of the yarn pa ckage shall be not less than 98 % of the declared value. This shall be tested in 
accordance with ISO 6741 -1. 
5 Packaging  
Acrylic yarn packages shall be packaged in suitable packaging materials which shall protect the product from 
damage during transportati on, handling and storage. The spools , cheeses  or cones  may be packaged in unit 
packages and into bulk packs.   
6 Labelling  
6.1 Unit packages  
Each unit pa ckage shall bear a clear label  which shall inc lude the following particulars:  
a) manufacturer’s name or tra de mark  and address ; 
b) product name as  “100 % acrylic yarn”;  DUS 2150 : 2020  
© UNBS 2020  – All rights reserved  5 
 c) yarn count in ‘Ne’ or ‘tex’ ; 
d) the direction of twist ( S or Z) and number of plies for plied yarn;  
e) net mass in grams;  
f) care instruction in accordance with US ISO 3758 ; 
g) type of yarn i.e. machine weav ing, machine knittin g or hand weaving and knitting;  
h) country of manufacture; and  
i) shade/lot number.  
6.2 Bulk  containers  
Each bulk container shall bear the following information:  
a) manufacturers name or trade mark  and address ; 
b) product name as  “100 % acrylic ya rn”; 
c) yarn count in ‘Ne’ or ‘tex’; ; 
d) net mass in kilograms ; 
e) number of packages ; 
f) type of yarn ; 
g) country of manufacture ; and  
h) lot number . 
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 each 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 2 . The bales or cases shall be selected at random.  
7.4 In case two or less cases are selected in the sample, at least 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 t he sample, at 
least five cones or cheeses shall be drawn at random from each of the selected case.  
Table 2  — Sampling  
Lot Size  Sample Size  
Up to 3  1 
4 – 10 2 
11 – 30 3  
6 © UNBS 2020  – All rights reserved  
 31 – 50 5 
Over 50  8 DUS 2150 : 2020  
© UNBS 2020  – All rights reserved  7 
 Bibliography  
[1] SITRA Norms for spinning mills  (seventh editi on) 
[2] IS 15336:2003,  Textiles - Acrylic Yarn for Hosiery – Specification    
 DUS 2150 : 2020  
© UNBS 2020  – All rights reserved  9 
 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 conjunctio n 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 that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Ugan da 
National Bureau of Standards.  
 
 DUS 2150 : 2020    
 
ICS 59.080.20 
Price based on nn pages  
© UNBS 2020 – All rights reserved