ICS 83.180  
 
Reference number  
DRS 480 -2: 2021  
© RSB 2021  
  
 RWANDA 
STANDARD  DRS  
480-2 
 
First edition  
2021 -mm-dd 
 
Wood a dhesives  — Specification  — 
Part 2:  
Urea -Formaldehyde Resin -based glue  
   
DRS 480 -2: 2021  
©RSB 2021 - All rights reserved                  ii 
 In order to match with technological development and to keep continuous progress in industries, 
standards are subject to periodic review. Users shall ascertain that they are in possession of the latest 
edition  
 
 
 
 
 
 
 
 
© RSB 2021  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized 
in any form or by any means, electronic or mechanical, including photocopying and microfilm, without 
prior written permission from R SB. 
Requests for permission to reprodu ce this document should be addressed to : 
Rwanda Standards  Board  
P.O Box 7099 Kigali -Rwanda  
KK 15 Rd, 49  
Tel. +250 788303492  
Toll Free: 3250  
E-mail: info@rsb.gov.rw  
Website: www.rsb.gov.rw  
ePortal: www.portal.rsb.gov.rw  DRS  480-2: 2021  
iii                ©RSB 2021 - All rights reserved  
 Contents  Page 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ .........................  21 
4 Requirements  ................................ ................................ ................................ ................................ .........  2 
4.1 General requirements  ................................ ................................ ................................ ...........................  2 
4.2 Specific requirements  ................................ ................................ ................................ ...........................  2 
5 Packaging and labelling ................................ ................................ ................................ ........................  3 
5.1 Pack aging  ................................ ................................ ................................ ................................ ...............  3 
5.2 Labelling  ................................ ................................ ................................ ................................ .................  3 
6 Sampling  ................................ ................................ ................................ ................................ ..............  43 
Annex  A (normative)  Det ermination of Insoluble matter in Type B adhesive  ................................ ...........  54 
A.1 General  ................................ ................................ ................................ ................................ .................  54 
A.2 Procedure  ................................ ................................ ................................ ................................ .............  54 
A.3 Calculation  ................................ ................................ ................................ ................................ ...........  54 
Annex  B (informati ve)  Which styles correspond to which element — Quick reference guide Error! Bookmark not defined. 5 
 DRS 480 -2: 2021  
©RSB 2021 - All rights reserved                  iv 
 Foreword  
Rwanda Standard s are prepared  by Technical Committees and approved by R wanda Standards Board (RSB) 
Board  of Directors in  accordance with the procedures of RSB, in compliance with Annex 3 of the WTO/TBT 
agreement on the preparation, adoption and application of standards.  
The main task of technical committees is to prepare national st andards.  Final Draft Rwanda S tandards 
adopted by Technical committ ees are ratified  by me mbers of RSB Board of Director s for publication and 
gazettment as Rwanda Standards.  
DRS  480-2 was prepared by Technical Committee RSB/TC 056, Paints, Varnishes, Adhesives and Related 
Products . 
In the preparation of this standard, reference was made to the following standard:  
ASTM D4690 : Standards Specification for Urea -Formaldehyde Resin Adhesives  
The assistance de rived from the above source is hereby acknowledged  with thanks.  
DRS 480  consists of the following parts, under the general title Adhesives — Specification : 
 Part 1: Casein -based  glue 
 Part 2: Urea -Formaldehyde Resin  based glue   
Part 3: Polyvinyl Acetate (PVA) based glue  
Committee membership  
The following organizations were represented on the Technical Committee on Paints, varnishes, Adhesives 
and Related Products  (RSB/TC 056) in the preparation of this standard.  
Star Construction and Consultancy Ltd  
Rwanda Inspectorate, Competition and Consum er Protection Authority (RICA)  
Standards for Sustainability  
Yong Rui Mei Investments Ltd  
AMACO Paints Ltd  
AMEKI Colour Ltd  DRS  480-2: 2021  
v                ©RSB 2021 - All rights reserved  
 Rwanda Investigation Bureau (RIB)  
University of Rwanda/College of Sciences and Technology (UR/CST)  
University of Rwanda/College of Ed ucation (UR/CE)  
Rwanda Forensic Laboratory (RFL)  
ROMAN Paints Ltd  
SHALOM Paints Ltd  
EARTHENABLE  
Rwanda  Standards Board (RSB) – Secretariat  DRS 480 -2: 2021  
©RSB 2021 - All rights reserved                  vi 
 Introduction  
The use of adhesives offers certain advantages over other binding techniques such as sewing, mechanical 
fastenings, or welding. These include the ability to bind different materials together, the more efficient 
distribution of stress across a joint, the cost -effectiveness of an easily mechanized process, and greater 
flexibility in design.  
Adhesives are typic ally organized by the method of adhesion followed by reactive or non -reactive, a term 
which refers to whether the adhesive chemically reacts in order to harden. Alternatively, they can be 
organized either by their starting physical phase or whether their  raw stock is of natural or synthetic origin.  
Wood glue is an adhesive used to tightly bond pieces of wood together. Many substances have been used as 
glues.  Urea -formaldehyde resin adhesives feature a low effective cost, low cure temperatures, resistance to  
microorganisms and abrasion, and light colo ur. It does not creep, and can be repaired with epoxy. It can 
rapidly  deteriorate in hot, moist environments, releasing formaldehyde (a carcinogen).  
 
 DRS  480-2: 2021  
1                ©RSB 2021 - All rights reserved  
 Wood a dhesives  — Specification  — Part 2: Urea -Formaldehyde resin -
based glue  
1 Scope  
This Draft Rwanda Standard specifies requirements, sampling and test methods for three types of urea -
formaldehyde thermosetting resin adhesives suitable for use on wood, wood -based substrates, or plastic 
laminates.  
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 references, 
the latest edition of the reference d document (including any amendments) applies.  
ASTM D907 , Terminology for  Adhesives  
ASTM B417, Test Method for Apparent density of non -free-flowing metal powders using the carney funnel  
ASTM D1875 , Test methods of density  of adhesives in fluid form  
ASTM D1 490, Test Method for Non -volatile content of Urea -Formaldehyde Resin Solutions  
ISO 3251 , Paints varnishes and plastics — Determination of non - volatile matter content  
ASTM D905, Test method for strength properties of adhesive bonds in shear by compression  loading  
ASTM D906, Test method for strength properties of adhesives in plywood type construction in shear by 
tension loading  
ASTM D1583 , Test methods for hydrogen ion concentration of dry adhesive films  
ASTM D905 , Test method for strength properties of adhesive bonds in shear by compression loading  
ASTM D906 , Test method for strength properties of adhesives in plywood type construction in shear by 
tension loading  
RS OIML R 87 , Quantity of product in pre -packages  
ISO 15605, Adhesives  — Sampling   
©RSB 2021 - All rights reserved                  2 
 3 Terms and definitions  
For the purposes of this standard, the terms and definitions given in ASTM D907  and the following apply.  
3.1 
urea -formaldehyde resin  glue 
a thermosetting synthetic resin made by condensing urea with formaldehyde and used especially in wood -
bond ing adhesives, colored molded articles, and for finishes (as of textiles, paper, and metals)  
4 Requirements  
4.1 General requirements  
4.1.1  The urea -formaldehyde resin adhesive shall be furnished as one of the following types:  
Type A — Powder with separate curing  agent;  
Type B — Powder with incorporated curing agent; and  
Type C — Liquid with separate curing agent.  
4.1.2  The curing agent for Types A and B shall readily disperse in the adhesive mixture when used in 
accordance with the manufacturer’s recommendation.  
4.1.3  The filler shall neither dissolve nor swell excessively in water, and shall not settle from the adhesive 
mixture during the working life.  
4.1.4 Consistency — The urea -formaldehyde resin adhesive freshly prepared film shall be homogenous 
liquid dispe rsion, free from any coagulated particles of foreign matter.  
4.1.5 Odour — The urea -formaldehyde resin adhesive freshly prepared film shall not emit any trace of 
putrefactive odour.  
4.1.6 Colour — The urea -formaldehyde resin adhesive shall not stain or dis colour or in any other way 
damage the material on which it is applied.  
4.1.7 Build -Up Properties — The urea -formaldehyde resin adhesive coat shall dry quickly and tacky 
enough so that the assembly formed shall have sufficient green strength to permit immed iate handling.  
4.2 Specific requirements  
The urea -formaldehyde resin based glue shall comply with the requirements given in table 1  when tested in 
accordance with the methods prescribed therein.  DRS  480-2: 2021  
3                ©RSB 2021 - All rights reserved  
 Table 1 – Specific requirements for urea -formaldehyde resin based  glue 
S/N Parameters  Requirements  Test methods  Type A  Type B  Type C  
 Density, g/cm3, max 0.70 0.80 1.282  B417 for types 
A&B 
D1875 for type C  
 Non-volatile matter , % by mass, min.  40 40 40 ASTM D1490 / 
ISO 3251  
 pH of Cured adhesive film, min.  2.5 2.5 2.5 ASTM D1583  
 Insoluble matter in type B   - - Annex A  
 Working life, h, max.  5 ISO 10364  
 Block shear (compression), dry at 24 °C, 
N/mm2 20 ASTM D905  
 Plywood shear 
(tension), N/mm2 Dry at 24 °C 2.5 ASTM D906  48 h soak  2.0 
 Storage life  A  
A – A retained sample of the initial lot of the adhesive shall be tested and shall meet the requirements of all tests for the 
applicable type of adhesive after the storage life time certified by the manufacturer  
5 Packaging and labelling  
5.1 Packaging  
5.1.1  The adhesive, Urea -Formaldehyde Resin  shall be packaged in a suitable container that prevents it 
from deterioration during storage, transportation and normal handling.  
5.1.2  The quantity of product packaged in a container shall be in accordance with the requirements of RS 
OIML R 87.  
5.2 Labelling  
5.2.1  Each container shall be marked legibly and indelibly with the following  information in any of the three 
languages officially accepted in the Republic of Rwanda namely: Kinyarwanda, French and English:  
a) name of t he product ; 
b) name and address of the manufacturer and/or registered trader mark;  
c) net content ; 
d) batch number  
e) manufacture and expiry d ates; 
f) instructions for use and disposal;  
g) special precautions related to toxicity or flammability;   
©RSB 2021 - All rights reserved                  4 
 h) storage condition  
6 Sampling  
Sampling shall be done in accordance with ISO 15605 . 
 DRS  480-2: 2021  
5                ©RSB 2021 - All rights reserved  
 Annex  A 
(normative)  
 
Determination of Insoluble matter in Type B adhesive  
A.1 General  
Determine the quantity of insoluble matter in Type B adhesives, including filler and any insoluble material, as 
percentage of n on-volatile constituents of the adhesive.  
A.2 Procedure  
Weigh the nearest milligram approximately 2 g of freshly mixed adhesive in a 100 -mL beaker and add 50 mL 
of cold solution of 20 parts by volume of glacial acetic acid and 80 parts by volume of distilled w ater. Stir the 
mixture thoroughly for 1 min and then add 0.500 ± 0.001 g, acid -washed diatomaceous earth . Stir the mixture 
for 2 min more and then filter through a fritted -glass crucible of medium porosity with the aid of a vacuum. 
Transfer all residue to the filter with a 20 % acetic acid solution. Wash the residue on the filter with at least 50 
mL of 20 % acetic acid and then with cold distilled water to remove the acid. Dry the crucible in an oven at 124 
± 3°C (255 ± 5°C) for 1 to 1 .5 h, cool in a desicc ator, and weigh to the nearest milligram.  
A.3 Calculation  
The insoluble content, as a percentage of the non -volatile content, is determined as follows:  
% 𝑜𝑓 𝑖𝑛𝑠𝑜𝑙𝑢𝑏𝑙𝑒  𝑚𝑎𝑡𝑡𝑒𝑟 ,𝑏𝑦 𝑚𝑎𝑠𝑠 =(𝑊𝑒𝑖𝑔 ℎ 𝑜𝑓 𝑟𝑒𝑠𝑖𝑑𝑢𝑒 −0.500 )
𝑊𝑒𝑖𝑔 ℎ 𝑜𝑓 𝑎𝑑ℎ𝑒𝑠𝑖𝑣𝑒  𝑋 % 𝑛𝑜𝑛 −𝑣𝑜𝑙𝑎𝑡𝑖𝑙𝑒  𝑚𝑎𝑡𝑡𝑒𝑟𝑋 100 
 
 
   
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 Bibliography  
[1] ISO/IEC Directives, Part  2, Rules for the structure and drafting of International Standards , 2016  
 
 DRS  480-2: 2021  
 
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