DRAFT UGANDA STANDARD  
  DUS 820  
Second  Edition  
2020 -mm-dd 
 
 
 Reference number  
DUS 820: 2020 
© UNBS 2020   
  
Paper scholastic stationery — Specification  
 DUS 820: 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 cor rect 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 
perm ission 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 820:2020  
© UNBS 2020  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 General Requ irements  ................................ ................................ ................................ ..........................  2 
4.1 Tolerance  ................................ ................................ ................................ ................................ ................  2 
4.2 Paper requirements  ................................ ................................ ................................ ...............................  2 
5 Specific require ments  ................................ ................................ ................................ ...........................  2 
5.1 Wire -stitched exercise books  ................................ ................................ ................................ ...............  2 
5.2 Bound exercise books  ................................ ................................ ................................ ..........................  3 
5.3 Wire stitched drawing exercise books  ................................ ................................ ................................  4 
5.4 Wire -stitched map exercise books  ................................ ................................ ................................ ...... 4 
5.5 Bound science practical notebook  ................................ ................................ ................................ ...... 5 
5.6 Wire -stitched examination answer books ................................ ................................ ...........................  5 
5.7 Wire -stitched register ................................ ................................ ................................ ............................  6 
5.8  Bound register  ................................ ................................ ................................ ................................ ...... 6 
5.9 Accountancy books  ................................ ................................ ................................ ..............................  7 
5.10  Graph books  ................................ ................................ ................................ ................................ ..........  7 
5.11  Shortha nd notebooks  ................................ ................................ ................................ ...........................  7 
5.12  Biology and nature study books  ................................ ................................ ................................ ..........  8 
5.13  Music books  ................................ ................................ ................................ ................................ ...........  8 
5.14  Theme books  ................................ ................................ ................................ ................................ .........  9 
5.15  Index books  ................................ ................................ ................................ ................................ ............  9 
5.16  Ruled sheets of paper  ................................ ................................ ................................ ...........................  9 
6 Packaging and Labelling  ................................ ................................ ................................ ....................  10 
6.1 Packaging  ................................ ................................ ................................ ................................ .............  10 
6.2 Labelling  ................................ ................................ ................................ ................................ ...............  10 
7 Sampli ng and criteria for conformity  ................................ ................................ ................................  11 
7.1 Lot ................................ ................................ ................................ ................................ .........................  11 
7.2 General Requirements for Sampling  ................................ ................................ ................................ . 11 
Annex  A (informative)  Illustration of a copy rule and side margin  ................................ ............................  12 
Bibliography  ................................ ................................ ................................ ................................ ......................  13 
 DUS 820: 2020  
iv © UNBS 2020  – All rights reserved  
 Foreword  
Uganda National Bureau of Standards (UNBS) is a par astatal 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 (I SO) 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 Commit tees. 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 comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Counci l. 
The committee responsible for this document is Technical Committee UNBS /TC 7, Textiles, Leather and 
Paper , Subcommittee SC 3, Paper and paper products  
This second edition cancels and replaces the first edition ( US 820:2008 ), which has been technically r evised  
The main changes compared to the previous edition are as follows:  
— the title has been changed to Paper scholastic stationery — Specification ; 
— clause 9 has been removed and replaced with different test methods in Table 1;  
— specific requirements f or the different books and sheets have been listed in Clause 5  
 DUS 820:2020  
© UNBS 2020  – All rights reserved  v 
  DRAFT UGANDA STANDARD  DUS 820: 2020  
 
© UN BS 2020  – All rights reserved  1 
 Paper Scholastic stationery — Specification  
1 Scope   
This Draft Uganda Standard specifies the requirements of books and sheets of paper intended for scholastic 
and related uses.  
2 Normati ve 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 lates t edition of the referenced document (including any amendments) applies.  
US ISO 534, Paper and board — Determination of thickness, density and specific volume  
US ISO 536, Paper and board — Determination of grammage  
US ISO 1923, Cellular plastics and rubber s — Determination of linear dimensions  
US ISO 1974, Paper — Determination of tearing resistance (Elmendorf method)  
US ISO 2470, Paper and board — Measurement of diffuse blue reflectance factor (ISO brightness)  
US ISO 2471 , Paper and board — Determination o f 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.  
3.1  
spine  
binding edge of a book  
3.2  
thread stitching  
process of stitching sections of a book together with thread before the book is bound  
3.3  
wire-stitching  
process of machine stitching by means of one or more wire stap les through the spine of a fold  
3.6  
leaf 
part of a sheet of paper in a b ook which extends from the binding edge of the book tow ards the front edge of 
the book   
2 © UNBS 2020  – All rights reserved  
 4 General Requirements  
4.1 Tolerance  
When determined in accordance with US ISO 1923 , a tolerance of ± 5 mm  shall be allowed on all paper sizes.  
4.2 Paper requirements  
Writing paper shall  
a) Comply with the requirements in Table 1;  
b) Be free from defects such as fibre b undles, holes, wood splinters, s pecks and breaks, and  
c) Accept writing media such as pencils and ballpoint pens without exhibiting any strike -through or 
undue sig ns of feathering or spread.  
Table 1 — Requirements of  paper  for making  books  
Parameter  Requirement  Test Method  
Substance, g/m2, min.  55 US ISO 536  
Opacity, %, min.  70 US ISO 2471  
Tearing,  mN, min.  600 US ISO 1974  
Bursting strength, kPa, min.  65 US ISO 2758  
Brightness, %, min.  65 US ISO 2470  
5 Specific requirements  
5.1 Wire -stitched e xercise books  
5.1.1 The size s of this type of book shall be any of the following:  
a) 148 mm × 210 mm  
b) 160 mm × 210 mm  
c) 162 mm × 203  mm. 
d) 162 mm × 229 mm  (C5). 
e) 204 mm × 255  mm. 
f) 210 mm × 297  mm (A4).  
5.1.2 These books shall be composed of a minimum of 32 pages and a maximum of 200 pages excluding 
the covers . 
5.1.3 There shall be at least two stitches on the spine of each exercise book.  The staples shall be 
positioned at least 25 m m and at most 60 mm from the top and bottom edges respectively, of the book.  
5.1.4 As agreed upon between the purchaser and the supplier, ruling may be done. If required, the ruling 
shall be done as follows:  DUS 820: 2020  
© UNBS 2020  – All rights reserved  3 
 a) the copy rule shall be done in clearly dark visi ble lines with the side margin done in a contrasting 
thicker colour to the rule (See Annex A for an illustration of a copy rule and side margin)  
b) The distance between horizontal lines shall be either 10 mm ± 0.5 mm  for lower p rimary school 
exercise books or  8 mm ± 0.5 mm  for the other levels of education  
c) Margins, whether on the top or on the side shall be 25 mm ± 3 mm  from the end  
d) There shall be 19 continuous lines for lower primary school exercise books and 22 for other education 
levels  
e) Double -ruled exercis e books shall have twelve double lines. The distance between the double lines 
shall be 5 mm ± 0.5 mm  
f) Square -ruled exercise books shall have 8-mm + 0.5 mm squares for lower primary exercise books and 6 
mm ± 0.5 mm squares for other educational levels. These  shall be ruled throughout the entire area.  
5.1.5 Cream laid, cream wove or white printi ng hardsized paper of minimum 55  g/m2 substance shall be 
used.  
5.1.6 Coloured cover paper of minimum 90 g/m2 substance shall be used.  
5.2 Bound exercise books  
5.2.1 The size s of this type of book shall be  any of the following : 
a) 148 mm × 210 mm  
b) 160 mm × 210 mm  
c) 162 mm × 203  mm. 
d) 162 mm × 229 mm  (C5).  
e) 204 mm × 255  mm. 
f) 210 mm × 297  mm (A4).  
5.2.2 These books shall be composed of a minimum of 96 pages and a maximum of 576 page s excluding 
the covers  
5.2.3 The sections shall be thread stitched and bound with binding cloth on the spine and strawboard on the 
top and the bottom of the book.   
5.2.4 As agreed upon between the purchaser and the supplier, ruling may be done. If required , the ruling 
shall be done as follows:  
a) The copy rule shall be done in blue colour while the top and side margin shall be in red colour.  
b) The distance between horizontal lines shall be 9 mm  
c) Margins, whether on the top or on the side shall be 25 mm  from the  end, and  
d) There shall be a minimum of 21 blue lines on each page  
5.2.5 Cream laid, cream wove or white printi ng hardsized paper of minimum 55  g/m2 substance shall be 
used.   
4 © UNBS 2020  – All rights reserved  
 5.2.6 Strawboard suitably covered with papers both from inside and outside shall be  used as cover and the 
minimum substance for different denominations of bound books when tested in accordance with US ISO 536  
shall be as follows:  
Table 2  — Substance for making bound exercise books s trawboard  
Denomination  Substance  
g/m2 
96, - 10 490 
1602-256 675 
256-400 900 
400 - 576 1 100  
5.3 Wire stitched drawing exercise books  
5.3.1 These books  shall be of the following  sizes:  
a) 176 mm× 250 mm  (B5):  
b) 210 mm × 297 mm (A4)  
c) 229 mm × 324 mm  
d) 250 mm × 353 mm (B4) and  
e) 297 mm × 420 mm (A3)  
5.3.2 These books shall be composed of a minimum of 20 pages and a maximum of 48 pages exclu ding 
covers  
5.3.3 Drawing books shall be made with or without interleaving papers.  For books with interleaving papers, 
the two centre leaves shall be of interleaving paper while the remaining leaves shall have drawing paper and 
interleaving paper alternating.  
5.3.4 The binding shall be done on the spine of the book by two wire stitches of 13 mm - 16 mm in length  
5.3.5 White  or offset  cartridge or drawing paper of minimum 80 g/m2 subst ance shall be used.  
5.3.6 Coloured cover of minimum 9 0 g/m2  substance shall be used.  
5.3.7 Drawing paper shall accept all commonly used drawing media without exhibiting undue signs of strike -
through, feathering or spread.  
5.4 Wire -stitched map exercise bo oks 
5.4.1 These books shall be of two sizes:  
a) 210 mm × 297 mm (A4) and  
b) 229 mm × 324 mm (C4)  
5.4.2 These books shall be composed of 36 and 48 pages excluding covers.  
5.4.3 Coloured cover of minimum 90  g/m2 substance shall be used.  DUS 820: 2020  
© UNBS 2020  – All rights reserved  5 
 5.4.4 When border lines are required, each edge of each page shall have a border line. Each border line 
shall consist of either one bold line or two closely spaced lines, ruled parallel to, and at least 15 mm and at 
most 20 mm from, the adjacent edge of the paper.  
NOTE  Map exercise b ooks are manufactured either horizontally or vertically.  
5.5 Bound science practical notebook  
5.5.1 The size of this type of book shall be 210 mm × 297 mm (A4).  
5.5.2 These books shall be composed of a minimum of 96 pages and a maximum of 192 excluding the 
printed data.  
5.5.3 The sections shall be thread stitched and bound with binding cloth on the spine and strawboard 
pasted on the top and the bottom of the book.  
5.5.4 As agreed upon between the purchaser and the supplier, ruling may be done. If required, the copy 
rule shall be done in blue colour while the margins shall be in red colour.  
5.5.5 Azure laid of minimum 70 g/m2 substance shall be used.  
5.5.6 Strawboard suitably covered with papers both from inside and outside shall be used as cover and the 
minimum substance for different denominations of science practical notebook shall be as follows:  
Table 3 — Substance for making bound science practical notebook s trawboard  
Denomination  Substance  
g/m2 
96-144 675 
144 -192 900 
5.6 Wire -stitched e xamination an swer books  
5.6.1 These books shall be of two sizes:  
a) 162 mm × 229 mm (C5)  
b) 210 mm × 297 mm (A4)  
5.6.2 Both the above sizes shall be composed of a minimum of 16 pages and a maximum of 48 pages 
inclusive of covers  
5.6.3 Each leaf shall be perforated for tear -out purposes.The line of perforations shall be parallel to,and 
located at most 11 mm from the binding edge.Perforation cuts shall have uniformly penetrated the paper such 
that when they are subjected to tear, the line of tear shall not deviate from the lin e of perforations.  
5.6.4 Size C5 shall have single wire stitch binding on the spine when composed of 16 pages. For other 
denominations of size C5 and all denominations of size A4, two wire stitches on the spine shall be provided.  
5.6.5 As agreed upon bet ween the purchaser and the supplier, ruling may be done. If required, the 
horizontal lines shall be done in blue ink and the margin shall be red. The m argin  shall be given at a distance 
of 30 mm from the spine for C5 size and 45 mm for the A4 size, the top  margins in the two cases shall be 25 
mm and 30 mm respectively.  
5.6.6 Each page shall have a feint ruling and shall be with or without a left -hand margin line as specified by 
the purchaser.   
6 © UNBS 2020  – All rights reserved  
 5.6.7 Cream laid, cream wove or white printi ng hardsized paper of  minimum 55  g/m2 substance shall be 
used.  
5.6.8 There shall be no extra cover and the paper used for the top shall be the same as that used inside.  
5.7 Wire -stitched register  
5.7.1 The wire -stitched register shall be of the following two sizes:  
a) 210 mm × 297 mm (A4)  
b) 229 mm × 324 mm (C4)  
5.7.2 These registers shall be composed of 96 and 144 pages exclusive of covers.  
5.7.3 The binding shall be done on the spine of the register by two wire stitches of 13 mm - 16 mm in 
length.  
5.7.4 The r uling shall be done as  agreed upon  between the purchaser and the supplier.  
5.7.5 Cream laid, cream wove or white printi ng hardsized paper of minimum 55  g/m2 substance shall be 
used.  
5.7.6 Coloured cover paper of minimum 100 g/m2 substance shall be used.  
5.8  Bound register  
5.8.1 The register (bound) shall be of the following two sizes:  
a) 210 mm × 297 mm (A4)  
b) 229 mm × 324 mm (C4)  
5.8.2 These registers shall be composed of a minimum of 96 pages and a maximum of 384 pages 
excluding the covers  
5.8.3 The sections shall be thread stitc hed and bound with binding cloth on the spine and strawboard on the 
top and the bottom of the book. Any other bindi ng may also be used if agreed upon  between the purchaser 
and the supplier.  
5.8.4 The r uling shall be done as agreed upon  between the purchase r and the supplier  
5.8.5 Cream laid, cream wove, white printing hardsized o r azure laid paper of minimum 55  g/m2 substance 
shall be used.  
5.8.6 Strawboard covered suitably with paper both from inside and outside shall be used as cover. For 
different denom inations, Table 3 shows the minimum value of the substances that shall be used:  
Table 4 — Substance for making bound register s trawboard  
Denomination  Substance  
g/m2 
Up to 192 pages  675 
192 and above  1 100  DUS 820: 2020  
© UNBS 2020  – All rights reserved  7 
 5.9 Accountancy books  
5.9.1 Accountancy books sh all be of size 210 mm × 297 mm  (A4).  
5.9.2 These registers shall be c omposed of 72 and 192 pages exclusive of covers.  
5.9.3 The sections shall be thread stitched and bound with binding cloth on the spine and strawboard on the 
top and the bottom of the book . Any other binding may also be used if agreed upon between the purchaser 
and the supplier.  
5.9.4 The ruling shall be done as agreed to between the purchaser and the supplier.  If required, the 
horizontal components shall be of feint ruling and shall allow for at least 29 entries on each page.  
5.9.5 Cream laid, cream wove or white printing  hardsized paper of minimum 55  g/m2 substance shall be 
used.  
5.9.6 Coloured cover paper of minimum 135  g/m2 substance shall be used.  
5.10 Graph books  
5.10.1 The size  of this type of book shall be  210 mm × 297 mm (A4).  
5.10.2 Graph books that are ruled for graph work solely shall be composed of a maximum  of 48 pages  
excluding the covers.  
5.10. 3 Graph books that are ruled for both writing purposes and graph work shall be comp osed of a 
minimum of 36 pages and a maximum of 96  pages  excluding the covers.  
5.10.4 The binding shall be done on the spine of the register by two wire stitches of 13 mm - 16 mm in 
length.  
5.10.5 As agreed upon between the purchaser and the supplier, rulin g may be done. If required, the ruling 
shall be done as follows:  
a) The horizontal rows shall each contain 80 squares and the vertical columns 130 squares. Each 
square shall be 2.0 mm ± 0.5 mm ` 
b) Graphs shall have unruled margins at all four edges  
c) The width of  the margin adjacent to the binding edge shall range from 20 mm to 30 mm, and that of 
the margins at the top, bottom and remaining side, shall each be at least 15 mm.  
d) The pages reserved for writing shall be ruled feint and the ruling shall incorporate a le ft-hand margin 
line  
5.10.6 Cream laid, cream wove or white printi ng hardsized paper of minimum 55  g/m2 substance shall be 
used.  
5.10.7 Coloured cover paper of minimum 95 g/m2 substance shall be used.  
5.11 Shorthand notebooks  
5.11.1 The size of a shorthan d notebook shall be 148 mm × 210 mm.  
5.11.2 These books shall be composed of 144 pages excluding the covers   
8 © UNBS 2020  – All rights reserved  
 5.11.3 Shorthand notebooks shall be bound with wire. There shall be a row of at least 12 uniformly spaced 
holes so clean -punched through the cover a nd pages of the book to enable the book to be opened flat through 
3600. 
5.11.4 The writing paper of shorthand notebooks shall be feint ruled on both sides.  
5.11.5 Cream laid, cream wove or white printi ng hardsized paper of minimum 55  g/m2 substance shall b e 
used.  
5.11.6  Coloured cover paper of minimum 13 5 g/m2 substance shall be used.  
5.12 Biology and nature study books  
5.12.1 These books shall consist of the following sizes:  
a) 148 mm × 210 mm (A5 ). 
b) 210 mm × 297 mm (A4).  
5.12.2 They shall be composed of a mini mum of 48 pages and  a maximum of 96 pages excluding the 
covers.  
5.12.3 The sections shall be thread stitched and bound with binding cloth on the spine and strawboard 
pasted on the top and the bottom of the book.  
5.12.4 Sheets of ruled writing paper and unr uled drawing paper shall alternate throughout with the first leaf 
being a ruled writing paper. However, t he two centre leaves for soft -cover books shall be of drawing paper .  
5.12.5 Cream laid, cream wove or white printi ng hardsized paper of minimum 55  g/m2 substance shall be 
used.  
5.12.6 Coloured cover paper of minimum 13 5 g/m2 substance shall be used.  
5.13 Music books  
5.13.1 Music books shall be of the following sizes:  
a) 148 mm × 210 mm (A5 ). 
b) 210 mm × 297 mm (A4).  
5.13.2 These books shall be composed of 32 p ages exclusive of covers.  
5.13.3 The binding shall be done on the spine of the register by two wire stitches of 13 mm - 16 mm in 
length.  
5.13.4 The r uling shall be done as agreed upon  between the purchaser and the supplier. If required, the 
ruling shall be  done as follows:  
a) the writing paper shall be ruled at right angles to the binding edge, in staves , each formed by five 
lines spaced 2.2 mm ± 0.1 mm apart.  
b) the distance between the first line of the first stave and the upper edge of a page shall be at least  
20 mm and at most 30 mm and the distance between the last line of the lowest stave and the 
lower edge of the page shall be at least 15 mm and at most 25 mm.  
c) A4 books shall contain 12 staves per page while those of A5L shall contain six staves per page. 
In both cases, the distance between consecutive staves shall be uniform to within 1 mm.  DUS 820: 2020  
© UNBS 2020  – All rights reserved  9 
 d) The colour of the ruled lines shall be grey or black.  
5.13.5 Cream laid, cream wove or white printing hardsized paper of minimum 105 g/m2 substance shall be 
used.  
5.13.6 Coloured cover paper of minimum 165 g/m2 substance shall be used.  
5.14 Theme books  
5.14.1 Theme books shall be of size 210 mm × 297 mm.  
5.14.2 They shall be composed of 72 pages.  
5.14.3 In theme books, sheets of writing paper (ruled on both sides), inter leaving paper and drawing paper 
shall be interleaved with one another in that order, the first and last leaves of a book being of writing paper.  
5.14.4 Coloured cover paper of minimum 135 g/m2 substance shall be used.  
5.15 Index books  
5.15.1 Index books sh all be of size 210 mm × 297 mm.  
5.15.2 They shall be composed of a minimum of 96 pages and a maximum of 368 pages excluding the 
covers.  
5.15.3 Unless otherwise specified by the purchase r, index books shall be divided into 26 sets, each covering 
a different  letter of the alphabet, given in the correct sequence.  
5.15.4 Strawboard suitably covered with papers both from inside and outside shall be used as cover. The 
minimum substance of the cover shall be 800 g/m2. 
5.16 Ruled sheets of paper  
5.16.1 Ruled sheets  shall be one of the following types:  
a) General purpose (with appropriate ruling)  
b) Accountancy  
c) graph  
5.16.2 They shall be of size 210 mm × 297 mm.  
5.16.3 As agreed upon between the purchaser and the supplier, ruling may be done. If required, the ruling 
shall be done as follows:  
a) ruled sheets shall be ruled on both sides  
b) general purpose sheets shall h ave the ruling as specified in sub clause 5.2   
c) Accountancy sheets shall h ave the ruling as specified in sub clause 5.9 . 
5.16.4 Graph sheets shall have the ruling as  specified in 4. on one side, and the reverse side shall be ruled 
feint and shall have a left -hand margin line as in 6.3.3. The width of the filing margin (longer edge, left -hand 
side) on the side ruled for graphs shall be at least 30 mm, and that of the r emaining margins on that side shall 
each be at least 15 mm.  
5.16.5  Ruled sheets of minimum 55  g/m2 substance shall be used.   
10 © UNBS 2020  – All rights reserved  
 6 Packaging and Labelling  
6.1 Packaging  
6.1.1 Books and ruled sheets of paper shall be supplied in packages containing books of th e same type, 
size and having the same number of pages.   
6.1.2 Each package of exercise books shall first be bound once lengthwise with a packing or wrapping 
paper strip. The paper strip shall have a minimum width of 6 cm and minimum substance of 70 gsm. It  shall 
also be strong enough to prevent tear. The overlapping ends of the strip shall be tightly struck with adhesive 
tape.  
6.1.3 The cartons used for packaging exercise books shall be designed so that the contents fit without 
movement.  
6.1.4 The cartons s hall be of such quality and strength to prevent bursting, tearing, distortion or opening up 
from the weight of exercise books  
6.1.5 The cartons shall be bound with a strong strip of tape at least two times, with at least one bind 
lengthwise. Alternatively,  gluing the ends together ensuring that the flaps firmly stick together may seal it.  
6.2 Labelling  
6.2.1 Each carton of books shall be labelled with the following particulars:  
a) name and address of the manufacturer and trade mark if any;  
b) description of the e xercise books in the carton, including the size in mm and the number of pages  
c) number of exercise books in the carton;  
d) lot/batch number; and 
e) country of origin  
6.2.2 Each book shall be clearly and indelibly labelled with the following particulars:  
a) name and address of the manufacturer/ distributor  
b) type of book  
c) number of pages  
d) size in mm  
e) space for name, school, class, year and subject.  
6.2.3  Each packet of ruled sheets of paper shall bear the following information in legible and durable 
marking:  
a) the name, addr ess  of the manufa cturer,  and trademark (if any)   
b) the type of ruling;  
c) the type of sheet, that is, single or fly (double);  
d) the number of sheets per packet; and  DUS 820: 2020  
© UNBS 2020  – All rights reserved  11 
 e) any additional information specified by the purchaser  
NOTE  Only when a packet of paper con tains 500 sheets (or fly sheets) of paper, may it be referred to as a ream. A 
packet that contains any other number of sheets, e.g. 480 sheets (or fly sheets) of paper should not be referred to as a 
ream.  
7 Sampling and criteria for conformity  
7.1 Lot 
All the packages of books of identical size and belonging to the same batch of manufacture shall be grouped 
together to constitute a lot.  
7.2 General Requirements for Sampling  
7.2.1 Samples shall be protected from exposure to heat, direct sunlight, liquids, varying humidity conditions 
as well as any other harmful influences.  
7.2.2 Samples shall be handled as little as possible and contact with sweated hands shall be strictly 
avoided.  
7.2.3 The number of books or ruled sheets to be sampled  from each lot shall be as given in Table 5 . 
Table 5  — Scale of sampling  
 
Lot size (Number of books 
or ruled sheets ) Sample size  
Up to 100  5 
101 to 150  8 
151 to 300  13 
301 to 500  20 
501 to 1 000  32 
1 001 to 3 000  50 
3 001 to 10 000  80 
10 001 and above  125  
12 © UNBS 2020  – All rights reserved  
 Annex  A 
(informative)  
 
Illustration of a copy rule and side margin  
 DUS 820: 2020  
© UNBS 2020  – All rights reserved  13 
 Bibliography  
[1] ISO ##### -#, General title — Part #: Title of part  
[2] ISO ##### -##:20##, General title — Part ##: Title of part  
 DUS 820: 2020  
© UN BS 2020  – All rights reserved  15 
 Certification marking  
Products that conform to Uganda standards m ay 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 li censed 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 wi th 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, Uganda 
National Bureau of Standards.  
 
 DUS 820: 2020    
 
ICS 85.080.10  
Price based on nn pages  
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