FINAL DRAFT UGANDA 
STANDARD  
  FDUS 1910-2  
First Edition  
2018-mm-dd  
 
 Reference number 
FDUS 1910-2: 2018 
© UNBS 2018  
  
Furniture — Metal chairs for office purposes — Part  2: 
Specification for revolving and tilting chairs  
 FDUS 1910-2:2018 
ii © UNBS 2018 – All rights reserved
 Compliance with this standard does not, of itself c onfer immunity from legal obligations 
A Uganda Standard does not purport to include all n ecessary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 2018 
All rights reserved. Unless otherwise specified, no  part of this publication may be reproduced or util ised in any 
form or by any means, electronic or mechanical, inc luding photocopying and microfilm, without prior wr itten 
permission from UNBS. 
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The Executive Director 
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P.O. Box 6329 
Kampala 
Uganda 
Tel: +256 417 333 250/1/2 
Fax: +256 414 286 123 
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  
 FDUS 1910-2:2018 
© UNBS 2018– All rights reserved  iii
 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 Stan dardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentar ius 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 o ut through Technical Committees. A Technical 
Committee is established to deliberate on standards  in a given field or area and consists of key stake holders 
including government, academia, consumer groups, pr ivate sector and other interested parties.  
Draft Uganda Standards adopted by the Technical Com mittee are widely circulated to stakeholders and th e 
general public for comments. The committee reviews the comments before recommending the draft standard s 
for approval and declaration as Uganda Standards by  the National Standards Council. 
The committee responsible for this document is Tech nical Committee UNBS/TC12, Furniture .   
 
 FINAL DRAFT UGANDA STANDARD FDUS 1910-2:2018 
 
1 © UNBS 2018  – All rights reserved
 Furniture — Metal chairs for office purposes — Part  2: 
Specification for revolving and tilting chairs  
1 Scope  
This Final Draft Uganda Standard covers the require ments of materials, dimensions, construction and fi nish of 
revolving and tilting metal chairs for office purpo ses. 
2 Normative references  
The following referenced documents referred to in t he text in such a way that some or all of their con tent 
constitutes requirements of this document. For date d references, only the edition cited applies. For u ndated 
references, the latest edition of the referenced do cument (including any amendments) applies. 
ISO 1520, Paints and varnishes -- Cupping test 
ISO 2009, Slotted countersunk flat head screws -- Product gra de A  
ISO 4624, Paints and varnishes -- Pull-off test for adhesion  
ISO 4950-1, High yield strength flat steel products -- Part 1: General requirements (sheets)  
US ISO 6361-1, Wrought aluminium and aluminium allo ys — Sheets, strips and plates — Part 1: Technical 
conditions for inspection and delivery 
US ISO 6362-1, Wrought aluminium and aluminium alloys —  Extruded rods/ bars, tubes and profiles — Part 
1: Technical conditions for inspection and delivery  
ISO 6860, Paints and varnishes -- Bend test (conical mandrel)  
ISO 9692-3:2016,Welding and allied processes -- Typ es of joint preparation -- Part 3: Metal inert gas welding 
and tungsten inert gas welding of aluminum and its alloys 
ISO 11503, Paints and varnishes -- Determination of resistance  to humidity (intermittent condensation)  
ISO 12633-1, Hot-finished structural hollow sections of non-allo y and fine grain steels — Part 1: Technical 
delivery conditions  
ISO 15184, Paints and varnishes -- Determination of film hardn ess by pencil test  
ISO 16143-3:2014, Stainless steels for general purp oses -- Part 3: Wire 
ISO 16925, Paints and varnishes -- Determination of the resist ance of coatings to pressure water-jetting  
US 1633, Cold rolled low carbon steel flat products  for cold forming — Technical delivery conditions  
2 © UNBS 2018 – All rights reserved
 4 Material requirement 
4.1 Aluminum tubes shall conform to US ISO 6362-1. 
4.2 Wax polish shall conform to US 573. 
4.3 Mild steel sheets shall conform to ISO 4950-1. 
4.4  Steel tubes shall conform to ISO 12633. 
4.5 Screws shall conform to ISO 2009. 
4.6 The wood suitable for furniture shall be used. 
5 Dimensions 
5.1  The height of the seat of chair from the floor surf ace shall be adjustable within the range of 400 mm to 
500 mm. 
5.2  The minimum width of the seat shall be 450 mm measu red at a point midway along the effective depth 
of seat. 
5.3  The minimum effective depth of seat shall be 400 mm . This shall be measured from a vertical line 
through the centre of the front edge of the seat to  a vertical line through the centre of the back of the seat. 
5.4 The minimum overall dimensions of chairs shall be a s follows: 
• overall height       785 mm; and 
• overall width including arm rests:   535 mm 
6 Fabrication  
6.1 Base  
The base shall have minimum, four legs made from st eel tubular pipes of wall thickness not less than 1 .60 
mm or from aluminum tubes with a wall thickness not  less than 2.0 mm or from mild steel sheets not les s than 
1.0 mm thick. The tubular pipe shall be either roun d or square in section. The outside diameter of the  round 
tubular pipe shall be not less than 25 mm and in th e case of square section the side of the square sha ll be not 
less than 20 mm. 
6.2 Frame  
The frame for the chair shall be made from steel tu bular pipes of wall thickness not less than 1.20 mm  or from 
aluminum tubes with a wall thickness not less than 2.0 mm. The tubes shall be either round or square i n 
cross-section. The outside diameter of the round tu bular pipes shall be not less than 25 mm and in the  case of 
square section the side of the square shall be not less than 20 mm. 
6.3 Revolving and tilting screw  
The chair shall have a fitting with a vertical axle  for swiveling and a horizontal axle for tilting. T he lateral 
movement is controlled by an adjustable spring or s prings and their compression can be varied by a kno b. 
This fitting shall be capable of supporting a load of 150 kg placed in the seat without any wobbling w hen the 
seat is rotated or tilted. FDUS 1910-2:2018 
© UNBS 2018 – All rights reserved  3
 6.4 Seat  
The seat shall be padded or caned. 
6.5 Back-rest 
The back-rest shall not be less than 250 mm in heig ht and shall be caned or padded. 
6.6 Castor unit 
Castor unit shall be mounted on legs. Castor units shall have wheels or balls between the forks of the  castor 
so as to allow easy rotation under load. The wheel or ball shall be hard and wear-resistant and shall not be 
less than 20 mm and not more than 50 mm in diameter . 
6.7 Ends of tables 
The open ends of tubes shall be provided with caps made from metal, plastic or rubber. 
6.8 Arm-rests 
Arm-rests shall be made from wood suitable for furn iture. The arm-rest may also be padded. These shall  be 
so shaped as to ensure comfort to the users, and sh all be fixed securely with screws from the under-si de of 
the tubular arms. 
7 Assembly 
The components shall be assembled by means of weldi ng, bolting or screwing. 
8 Finish 
8.1 Metal components 
8.1.1 All dents, burrs and sharp edges 'shall be removed from the various components. The components 
shall be individually pickled, scrubbed and rinsed to remove grease, rust, scale or any other foreign element. 
8.1.2 Immediately after pickling, all the mild steel part s shall be given phosphating treatment conforming t o 
ISO 9587.   
8.1.3 Putty shall be applied to all the surfaces requirin g filling. 
8.1.4 Coat/coats of enamel paint conforming to ISO 1518-1  shall then be applied. 
8.1.5 Aluminum parts may be anodized, if required by the purchaser. 
8.2 Wooden arms 
The wooden arms shall be polished either with wax p olish or a transparent glossy french polish, or sta ined 
dark and polished or lacquered as desired by the pu rchaser.  
4 © UNBS 2018 – All rights reserved
 9 Performance requirements of finish 
9.1 Scratch hardness test   
Use ISO 15184. 
9.2 Pull off adhesion test 
Use ISO 4624. 
9.3 Resistance of coating to pressure water jetting  test 
Use ISO 16925. 
9.4 Resistance to humidity (intermittent condensati on) test 
Use ISO 11503. 
9.5 Bend test  
Use ISO 6860. 
9.6 Cupping test 
Use ISO 1520. 
10 Packing 
All the component parts shall be packed in such a w ay that no damage is caused to them during transit . 
11 Information to be supplied by the purchaser 
The purchaser shall supply the following informatio n to the supplier along with the order: 
a) type of seat required; 
b) type of back required; 
c) whether castor unit required and what type; 
d) colour of finish; and 
e) where alternative methods of construction and fi nish are specified, these shall be clearly stated i n the 
order. 
12 Marking 
All metal chairs shall be legibly and indelibily ma rked with the following: 
a) name, address/trade mark of the manufacturer;  
b) name of the product; and  FDUS 1910-2:2018 
© UNBS 2018 – All rights reserved  5
 c) country of origin .   
  
6 © UNBS 2018 – All rights reserved
 Bibliography 
IS 3499-2, Furniture: Metal chairs for office purposes – Part 2: Revolving and tilting – Specification    
 
 FDUS 1910-2:2018 
7 © UNBS 2018  – All rights reserved
 Certification marking 
Products that conform to Uganda standards may be ma rked 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 lic ensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conj unction with the relevant Uganda Standard. The 
presence of this mark on a product or in relation t o a product is an assurance that the goods comply w ith the 
requirements of that standard under a system of sup ervision, control and testing in accordance with th e 
certification mark scheme of the Uganda National Bu reau 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.  
 
 FDUS 1910-2:2018 
 
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© UNBS 2018 – All rights reserved