DRAFT UGANDA STANDARD  
  DUS 821  
Second  Edition  
2021 -mm-dd 
 
 
 Reference number  
DUS 821 : 202 1 
© UNBS 202 1  
  
Bond paper — Specification  
 
 
 
 DUS 821: 2021 
ii © UNBS 2021 – 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 applicatio n 
© UNBS 2021  
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 
permission from UNB S. 
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 821 :2021 
© UNBS 202 1 – 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 -
ordin ate the elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) ;  
(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, academi a, 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 recommending th e 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 products , Subcommittee SC 3, Paper  and paper  products . 
This second edition cancels and replaces the first  edition (US 821:2008 ), which has been technically revised 
The main changes compared to the previous edition are as follows:  
— the clause for terms and definitions  has been added.  
 DRAFT UGANDA  STANDARD  DUS 821 : 202 1 
 
© UNBS 2021  – All rights reserved  1 
 Bond pap er — Specification  
1 Scope   
This Draft Uganda Standard specifies requirements, sampling and test methods for four classes (based on 
grammage) of general purpose bond paper suitable for printing, typewriting and for pen and ink writing and 
that are supplied  in sheets or reels.  
2 Normative references   
The following 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 re ferences, 
the latest edition of the referenced document (including any amendments) applies.  
ISO 5636 -3, Paper and board — Determination of air permeance (medium range) — Part 3: Bendtsen method  
ISO 8791 -2, Paper and board — Determination of roughness/smoot hness (air leak methods) — Part 2: 
Bendtsen method  
US ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for 
monitoring the atmosphere and conditioning of samples  
US ISO 536, Paper and board — Determination of grammage  
US ISO 1974, Paper — Determination of tearing resistance (Elmendorf method)  
US ISO 2470 -1, Paper, board and pulps — Measurement of diffuse blue reflectance factor — Part 1: Indoor 
daylight conditions (ISO brightness)  
US ISO 2471, Paper and board — Determination of opacity (paper backing) — Diffuse reflectance method  
US ISO 2758, Paper – Determination of bursting strength  
3 Terms and definitions   
For the purposes of this document, the following terms and definitions apply.  
ISO and IEC maintain term inological databases for use in standardization at the following addresses:  
— ISO Online browsing platform: available at http://www.iso.org/obp  DUS 821 : 2021  
2 © UNBS 2021  – All rights reserved  
 4 Requirements  
4.1 Class  
The paper shall be one of the following classes (with  the specified nominal grammage) as specified by the 
purchaser:  
i) Class 1: 50 g/m2 
ii) Class 2: 60 g/m2 
iii) Class 3: 70 g/m2; and  
iv) Class 4: 80 g/m2 
4.2 Material  
4.2.1  General  
4.2.1.1  The paper shall be reasonably free from paper dust, small fibre bundles, holes, wood splinters, 
specks and other defe cts that may impair its serviceability.  
4.2.1.2  The colour of the paper shall be as follows, and in the case of Class 1 and Class 2, as specified 
by the purchaser:  
i) Class 1 – white or tinted paper;  
ii) Class – white or tinted paper;  
iii) Class 3: - white paper; and  
iv) Class 4 – white paper  
4.2.2  Physical properties  
4.2.2.1  The physical properties of the paper shall comply with the relevant requirements given in Table 1.  
4.2.2.2  The sizing of the paper shall be such that, each side of the paper will accept all common writ ing 
media (applied in the normal manner) without undue signs of feathering or spread.  
Table 1 — Physical requirements  
Property  Requirement  Test 
method  
Class 1  Class 2  Class 3  Class 4  
Fibre composition  100 % chemically processed  TAPPI T401  
Grammage, g/ m2 
Nominal  
Actual, min.   
50 
45  
60 
55  
70 
65  
80 
75 US ISO 536  
Bursting strength, Kpa, min.  100 125 140 150 US ISO 
2758  
Tearing resistance ( MD), mN, 
min. 250 350 410 440 US ISO 
1974  
Brightness (of white paper), %, 80 80 80 80 US ISO DUS  821: 202 1 
© UNBS 2021 – All rights reserved  3 
 min. 2470  
Roughness , ml/min, max.  
Topside  
Wire side   
250 
-  
300 
400  
300 
400  
250 
300 ISO 8791 -2 
Opacity, %, min.  65 73 78 82 US ISO 
2471  
 
4.3 Dimensions  
4.3.1  Sheets  
4.3.1.1  Sheets shall be of one of the preferred nominal sizes identified by a size designation given in 
Table 2, or by one of the other size designations specified by the purchaser.  
4.3.1.2  The actual width and length of a sheet, measured to the nearest 1 mm with the aid of a metre rule 
shall conform to the appropriate values given in Table 2 or as specified b y the buyer.  
4.3.1.3  The sheets shall be so cut that the machine direction (MD) of the paper, relevant to the size 
designation is parallel to the dimension specified by the purchaser.  
Table 2 — Dimensions of sheets of preferred size designation  
Size desig nation  Width,  
mm Length,  
mm 
RA0 860 ± 4 1 220  ± 5 
RA1 610 ± 4 860 ± 4 
A3 297 ± 2 420 ± 2 
A4 210 ± 2 297 ± 2 
A5 148 ± 1.5 210 ± 2 
 
4.3.2  Reels  
4.3.2.1  A reel shall not contain more than one splice, and when a splice is present its position shall be 
clearly indicated on each side of the reel.  
4.3.2.2  The nominal width of a reel shall be one of the widths given in Table 3, as specified by the 
purchaser, and the dimensions of a reel, when measured with the aid of a steel metre rule in accordance with 
5.1, shall conform to the values given in Columns 2, 3 and 4.  
Table 3 — Dimensions of reels  
Nominal width,  
mm. Actual 
width,  
mm. Diameter,  
mm, . Internal diameter of 
core,  
mm, min.  
215 215 ± 50 800 – 1 200  76 
320 320 ± 50 
410 410 ± 50 DUS 821 : 2021  
4 © UNBS 2021  – All rights reserved  
 430 430 ± 50 
480 480 ± 50 
880 880 ± 50 
5 Pack aging  
5.1 Pack aging  
5.1.1  Sheets  
Sheets shall, unless otherwise specified by the purchaser, be packed flat and wrapped in reams in 
accordance with commercial practice. Only sheets of the same class, colour and dimensio ns shall be packed 
together.  
5.1.2  Reels  
Paper supplied in reels shall be tightly wound on cores without wrinkling or distortion  
5.2 Labelling  
5.2.1  Sheets  
The following information shall appear in clear and indelible marking on the wrapping of each ream:  
a) manufacturer’s name, physical address and/or trademark;  
b) commodity name  as, “bond paper”;  
c) class and grammage of paper;  
d) colour of paper;  
e) size designation and, when relevant the machine direction of the sheets;  
f) number of sheets in the wrapping;  
5.2.2  Reels  
The following information shall appear in clear and indelible marking on one side of each reel:  
a) The information specified in 5.2.1 (a) – (d); 
b) nominal width of the reel;  
c) net mass of the paper ; and  
d) gross mass  of the paper . 
 
. 
 DUS  821: 202 1 
© UNBS 2021  – All rights reserved  5 
 Certification marking  
Products t hat 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 a ssurance 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 check ed 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 821 : 202 1   
 
ICS 85.080.10  
Price based on nn pages  
© UNBS 2021– All rights reserved