ICS 83.180  
 
Reference number  
DRS  480-1: 2021  
© RSB 2021  
  
 RWANDA 
STANDARD  DRS  
480-1 
 
First edition  
2021 -mm-dd 
 
Wood adhesives — Specification  — 
Part 1:  
Casein -based  glue 
   
DRS 480 -1: 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 : 
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P.O Box 7099 Kigali -Rwanda  
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Website: www.rs b.gov.rw  
ePortal: www.portal.rsb.gov.rw  DRS 480 -1: 2021  
iii                ©RSB 2021 - All rights reserved  
 Contents  Page 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Requirements  ................................ ................................ ................................ ................................ .........  2 
4.1 General requirements  ................................ ................................ ................................ ...........................  2 
4.2 Specific requirements  ................................ ................................ ................................ ...........................  2 
5 Packaging and labelling ................................ ................................ ................................ ........................  3 
5.1 Packaging  ................................ ................................ ................................ ................................ ...............  3 
5.2 Labelling  ................................ ................................ ................................ ................................ .................  3 
6 Sampling  ................................ ................................ ................................ ................................ ................  3 
 DRS 480 -1: 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 standards.  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 -1 was prepared by Technical Committee RSB/TC 056, Paints, Varnishes, Adhesives and Related 
Products . 
In the preparat ion of this standard, reference was made to the following standard:  
ASTM D4689 - 12: Standard Specification for Adhesive, Casein -Type  
The assistance de rived from the above source is hereby acknowledged with thanks.  
DRS 480 consists of the following parts, under the general title Wood a dhesives — 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 -1: 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 Education (UR/CE)  
Rwanda Forensic Laboratory (RFL)  
ROMAN Paints Ltd  
SHALOM Paints Ltd  
EARTHENABLE  
Rwanda  Standards Board  (RSB) – Secretariat  DRS 480 -1: 2021  
©RSB 2021 - All rights reserved                  vi 
 Introduction  
The use of adhesives offers certain advantages over other binding techniques such as sewing, mechanic al 
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 ty pically 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 thei r 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.  Casein glue was used to make strong and robust joints in early aviation, but fell out of favo ur due to its  
susceptibility to attack by bacteria.  
 
 DRS 480 -1: 2021  
1                ©RSB 2021 - All rights reserved  
 Wood adhesives — Specification — Part 1: Casein -based  glue 
1 Scope  
This Draft Rwanda Standard specifies requirements, sampling and test methods for   casein -based  glue used 
for adhering wood to wood.  
It does not cover the cooked casein adhesives.  
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 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 loadi ng 
ASTM D906, Test method for strength properties of adhesives in plywood type construction in shear by 
tension loading  
ASTM D905, Test method for strength properties of adhesive bonds in shear by compression loading  
ASTM D906, Test method for strength pro perties of adhesives in plywood type construction in shear by 
tension loading  
ISO 3251 , Paints varnishes and plastics — Determination of non - volatile matter content  
ISO 15605 , Adhesives  — Sampling  
ISO 10364 , Structural adhesives — Determination of the pot life (working life) of multi -component adhesives  
ASTM D1084, Test methods for viscosity of adhesives  
RS OIML R 87 , Quantity of product in pre -packages  
3 Terms and definitions  
For the purposes of this standard, the terms and definitions given in ASTM D907 and the following apply.   
©RSB 2021 - All rights reserved                  2 
 3.1 
casein -based glue  
a water -resistant adhesive made from casein and usually hydrated lime and mixed with cold water for use 
especially in making plywood and furniture.  
4 Requirements  
4.1 General requirements  
4.1.1  The casein -based glue  shall be  a dry powder or granular product comprising a mixture of casein, or 
casein and other protein source, with the necessary dry chemicals to effect solution when the mixture is added 
to water.  
4.1.2  The casein -based  glue shall be cla ssified as follow:  
Class B, Water resistant — capable of producing sufficient adhesive -joint strength and durability and has 
sufficient water resistance to make the bonded products serviceable under conditions in which there will be 
occasional intermittent  exposure to wet conditions or high humidity.  
Class C, Dry use — has sufficient adhesive -joint strength and durability under normal interior service 
conditions where the relative humidity s not high and does not fluctuate between wide limits.  
4.1.3 Consist ency — The casein -based  glue freshly prepared film  shall be homogenous liquid dispersion, 
free from any coagulated particles of foreign matter.  
4.1.4 Odour — The casein -based  glue freshly prepared film shall not emit any trace of putrefactive odour.  
4.1.5 Colour — The casein -based  glue shall not stain or discolour or in any other way damage the 
material on which it is applied.  
4.1.6 Build -Up Properties — The casein -based  glue coat shall dry quickly and tacky enough so that the 
assembly formed shall have sufficient green strength to permit immediate handling.  
4.2 Specific requirements  
The casein -based  glue shall comply with the requirements given in table 1  when tested in accordance wit h the 
methods prescribed therein.  
Table 1 – Specific requirements for casein -based glue  
S/N Parameters  Requirements  Test methods  
1 pH 9 – 10 ASTM D1583  
2 Total solids , % by mass, min.  40 ISO 3251  
3 Working life, hours, min.  5 ISO 10364  
4 Viscosity at 25 ± 0.25 °C, cp.  3 000 – 15 000  ASTM D 1084  
5 Block shear (compression), dry  at 1 and 4 h , 
N/mm2,   20  ASTM D905  
6 Plywood Dry at 1 and 4 hA 2.5 ASTM D906  DRS 480 -1: 2021  
3                ©RSB 2021 - All rights reserved  
 (tension) , N/mm2 Soak, 48 -h at 1 and 4 hA 1.0 
7 Storage life  B - 
A – One and four hours refers to age of adhesive after mix.  
B – A lot of the designated adhesive shall be tested for all the required tests after aging for the desired storage life time. 
The longest shelf life tested which passes all the minimum requirements shall be the storage life certified by the 
manufacturer.  
5 Packaging and labelling  
5.1 Packaging  
5.1.1  The casein -based  glue shall be packaged in a suitable container that prevents it from deterioration 
during storage, transportation and normal handling.  
5.1.2  The quant ity 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 labell ed 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 the 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 ; 
h) storage condition  
6 Sampling  
Sampling shall be done in accordance with ISO 15605 . 
   
©RSB 2021 - All rights reserved                  4 
 Bibliography  
[1] ISO/IEC Directives, Part  2, Rules for the structure and drafting of International Standards , 2016  
[2] ISO/IE C TR 10000 -1, Information technology — Framework and taxonomy of International 
Standardized Profiles — Part 1: General principles and documentation framework  
[3] ISO 10241  (All parts) , Terminological entries in standards  
[4] ISO 128-30, Technical drawings — General principles of presentation — Part 30: Basic conventions for 
views  
[5] ISO 128-34, Technical drawings — General principles of presentation  — Part 34: Views on mechanical 
engineering drawings  
[6] ISO 128-40, Technical drawings — General principles of p resentation  — Part 40: Basic conventions for 
cuts and sections  
[7] ISO 128-44, Technical drawings — General principles of presentation  — Part 44: Sections on 
mechanical engineering drawings  
[8] ISO 31 (all parts), Quantities and units  
[9] IEC 60027 (all par ts), Letter symbols to be used in electrical technology  
[10] ISO 80000 -1, Quantities and units -- Part 1: General  
[11] ISO 690, Documentation — Bibliographic references — Content, form and structure  
 DRS 480 -1: 2021  
 
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