DRAFT UGAN DA STANDARD  
  DUS 2480  
First  Edition  
2022-mm-dd 
 
 
 Reference number  
DUS 2480 : 202 2 
© UNBS 202 2  
  
Textiles — Canvas  — Specification  
 
 
 
 DUS 2480: 2022 
ii © UNBS 2022 – 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 app lication  
© UNBS 2022  
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 DUS 2480 :2022 
© UNBS 202 2 – 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 c o-
ordinate the elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) ;  
(b) a contact point for the WHO/FAO Codex Aliment arius Commission on Food Standards ; and  
(c) the National Enquiry Point on TBT  Agreement  of the Worl d Trade Organisation (WTO).  
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to delibera te 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 stak eholders and the 
general public for comments. The committee reviews the comments before recommen ding the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
The committee responsible for this document is Tech nical Committee UNBS/TC 315, Textiles and related 
products.  
 DRAFT UGANDA STANDARD  DUS 2480 : 202 2 
 
© UNBS 2022 – All rights re served 1 
 Textiles — Canvas — Specification  
1 Scope  
This Draft Uganda Standard specifies requirements , sampling and test methods for canvas fabrics . 
This Standard is not applicable to canvas fabric used in making tent s and tarpaulins, of which there are more 
specific Standards ; FDEAS 1072 and FDEAS  1073.  
2 Normative references  
The following documents are referre d 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 amendment s) 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 fast ness — Part C10: Colour fastness to washing with soap or 
soap and s oda 
US ISO 105 -X12, Textiles — Tests for colour fastness — Part X12: Colour fastness to rubbing  
US ISO 1833 (all parts), Textiles — Binary fibre mixtures — Quantitative chemical analysis  
US ISO 2859 -1, Sampling procedures for inspe ction by attributes — Part 1: Sampling schemes indexed by 
acceptance quality limit (AQL) for lot -by-lot inspection  
US ISO 3071 , Textiles — Determination of pH of aqueous extract  
US ISO  3801, Textiles — Woven fabric s — Determination of mass per unit length and mass per unit area  
US ISO 5077, Textiles — Determination of dimensional change in washing and drying  
US ISO 6330, Textiles — Domestic washing and drying procedures for textile test ing  
US ISO 13934 -1, Textiles — Tensile properties of fabrics — Part 1: Determination of maximum force and 
elongation at maximum force using the strip method  
US ISO 13937 -1, Textiles — Tear properties of fabrics — Part 1: Determination of tear force using ballistic 
pendulum method (Elm endorf)  
US ISO 22198 , Textiles — Fabrics — Determination of width and length  
ISO 14362 -1, Textiles — Methods for determination of certain aromatic amines derived from azo colorants — 
Part 1: Detection of the use of certain azo  colorants accessible with and  without extracting the fibres  
ISO 14362 -3, Textiles — Methods for determination of certain aromatic amines derived from azo colorants — 
Part 3: Detection of the use of certain azo colorants, which may release 4 -aminoazobenzen e DUS 2480 : 202 2 
2 © UNBS 2022 – All rights reserved  
 ISO 16373 -1, Textiles — Dyes tuffs — Part 1: General principles of testing coloured textiles for dyestuff 
identification  
ISO 16373 -2, Textiles — Dyestuffs — Part 2: General method for the determination of extractable dyestuffs 
including allergenic and car cinogenic dyestuffs (method us ing pyridine -water)  
ISO 16373 -3, Textiles — Dyestuffs — Part 3: Method for determination of certain carcinogenic dyestuffs 
(method using triethylamine/methanol)  
EAS 256 , Textiles — Method for determination of scouring loss in grey and finished cotton mater ials 
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 br owsing platform: available at http://www.iso.org/obp  
3.1  
canvas  
durable, plain, tightly -woven fabric usually made of cotton or linen  or along with their blends  
3.2  
pliability  
easily bent without breaking  
4 Classification of canvas fabrics  
Depending  on the density of the weave, canva s fabric comes in two types:  
a) plain canvas; and  
b) duck canvas  
NOTE  Duck fabric usually contains plied fibres in both the warp and we ft hence is often heavier and stronger than the 
“commonly known” canvas fabric w hich may hav e single ply for both warp and weft .  
5 Requirements  
5.1 General requirements  
5.1.1  Canvas fabric shall be free from objectionable flaws including, floats, missing threads, printing or 
dyeing defects, bars, slubs and any other defect which may significantly mar the appearance or affect the 
serviceability or durability of the te xtile 
5.1.2  The proofing  on canvas fabric shall show no tendency to crack when folded  
5.2 Specific requirements  
5.2.1  Fibre composition  
The fibre composition of the canvas fabric shall be as declared on the label, subj ect to a tolerance of ± 3 % 
when tes ted in accordance with  a relevant part of US ISO 1833.  DUS  2480 : 202 2 
© UNBS 2022 – All rights  reserved  3 
 5.2.2  Dimensions  
The dimensions of the canvas fabric shall be as declared on the label, subject to a tolerance of ± 1.5 cm when 
tested in accordance with US ISO 2219 8. 
5.2.3  Restricted colourants  
Canvas fabric  shall be free from  listed restricted colourants  when tested in accordance with ISO 14362 -1, ISO 
14362 -3, ISO 16373 -2 and ISO 16373 -3. Colourants on textiles shall be identified and classified in 
accordance with  ISO 16373 -1. 
5.2.4 Physical and  chemical requirements  
Canvas  fabric  shall co mply with  the requirements given in Table 1  when tested in accordance with the test 
methods specified therein.  
Table 1 — Physical and chemical  requirements of canvas fabric  
Parame ter Requirement  Test met hod 
Plain canvas  Duck canvas  
Mass per unit area, g/m2, min.  150 340 US ISO 3801  
Tensile strength, N, 
min. Warp direction  196 650 US ISO 13934 -
1 Weft direction  147 400 
Tearing strength, 
N, min.  Warp direction  9.8 30 US ISO 1 3937 -
1 Weft direction  6.9 24 
Shrinkage or 
elongation,  %. m ax. Grey  5.0 US ISO 5077  
and US ISO 
6330  Scoured or dyed  2.5 
pH value  6.0 – 8.5 US ISO 3 071 
Scouring loss, %, 
max.  Grey  5.0 EAS 256 
Scoured or dyed  2.5 
Colour fastness (for 
dyed canvas),  to: Light, min.  4 US IS O 105 -
B02 
Washing, min.  4 US IS O 105 -
C10 
Rubbing , 
min. Dry 3 US ISO 105 -
X12 Wet 2 
 
5.2.5  Proofed canvas  
5.2.5.1 Proofing content  
5.2.5.1.1 The proofing content shall not exceed 15 % by mass when tested in accordance with An nex A.  
5.2.5.1.2 The pro ofing mixture shall not contain a ny ingredient which is liable to damage the proofed 
canvas.  DUS 2480 : 202 2 
4 © UNBS 2022 – All rights reserved  
 5.2.5.2 Pliability  
Proofed canvas shall be pliable when the sample is kept for 2 hours at 0 0C and examined immediately 
thereafter.  
6 Pack aging  
Canvas  shall be packaged in such  a way so as to avoid damage  during  storage as well as transit.  
7 Labelling  
Canvas shall be clearly and indelibly labelled with the following:  
a) manufacturer’s name and/ or trademark  and physical address ; 
b) name of the pro duct such as “Canvas ,” ; 
c) classification of fabric such as “Plain” or “Duck”;  
d) fibre composition;  
e) width and length of the canvas ; and  
f) country of origin.  
8 Sampling  
Sampling shall be done in accordance w ith ISO 2859 -1 
 DUS  2480 : 202 2 
© UNBS 2022 – All rights  reserved  5 
 Annex  A 
(normative)  
 
Determination of th e proofing content  
A.1 Procedure  
Cut four pieces of the material 80 mm × 80 mm accurately from different places in a sample of proofed can vas 
or duck and condition them for 24 hours under standard atmospheric conditions. Weigh the conditioned pieces 
accura tely and subject them to successive extractions in a Soxhlet apparatus with a) carbon tetrachloride for 3 
hours, b) ractified spirit for 2  hours and c) water for 2 hours.  
After the above treatment, the material may contain pigments in the interstices of th e fabric. To remove these, 
separate individual threads from the pieces, collect together and give light treatment with soap. Dry and 
condi tion the sample in an atmosphere of 65% ± 2% relative humidity and at a temperature of 27 0C ± 2 0C 
and weigh.  
NOTE  Other solvents may be used in case the proofing material is not extracted by solvents (carbon tetrachloride 
and rectified spirit).  
A.2 Calcu lation  
Calculate the mass of the proofing from the difference between the initial mass of the test pieces and the 
mass  of the threads after deproofing, and express as a percentage of the deproofed fabric.  
 DUS 2480 : 202 2 
6 © UNBS 2022 – All rights reserved  
 Bibliography  
[1] IS 6803 (1972): Special Proofed Canvas and Duck [PCD 13: Rubber and Rubber Products]  
[2] IS 1422:1983, Cotton duck  
[3]      IS 1424 (1983): Cotton canvas 
 DUS  2480 : 202 2 
© UNBS 2022 – All rights re served 7 
 Certification marking  
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certif ication 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 N ational Bureau of Standards and in conjunction with the relevant Uganda Standard. The 
presence of this mark on a produ ct 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 lice nsing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 DUS 2480 : 202 2   
 
ICS 59.080.30 
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© UNBS 2022– All rights reserved