ICS 87.040  
 
Reference number  
DRS 466: 2021  
© RSB 2021  
  
 RWANDA 
STANDARD  DRS 
466 
 
First edition  
2021 -mm-dd 
 
Two-Pack Epoxy enamel, glossy paint — 
Specification  
 
   
DRS 466 : 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 466 : 2021  
iii                ©RSB 2021  - All rights reserved  
 Contents  Page 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  2 
4 Requirements  ................................ ................................ ................................ ................................ .........  3 
4.1 General requirements  ................................ ................................ ................................ ...........................  3 
4.2 Specific requirements  ................................ ................................ ................................ ...........................  4 
4.2.1  Specific requirements for wet coat  ................................ ................................ ................................ ...... 4 
4.2.2  Specific requirements for dry coat  ................................ ................................ ................................ ...... 4 
5 Packaging and labelling ................................ ................................ ................................ ........................  5 
5.1 Packaging  ................................ ................................ ................................ ................................ ...............  5 
5.2 Labelling  ................................ ................................ ................................ ................................ .................  5 
6 Sampling  ................................ ................................ ................................ ................................ ................  6 
Annex  A (normative)  Determination of mass per 10 litres  ................................ ................................ ............  7 
A.1 General  ................................ ................................ ................................ ................................ ...................  7 
A.2 Apparatus  ................................ ................................ ................................ ................................ ...............  7 
A.3 Procedure  ................................ ................................ ................................ ................................ ...............  7 
A.4 Calculations  ................................ ................................ ................................ ................................ ...........  8 
Annex  B (normative)  Determination of consistency  ................................ ................................ ....................  10 
B.1 Scope  ................................ ................................ ................................ ................................ ....................  10 
B.2 Flow cup method  ................................ ................................ ................................ ................................ . 10 
 DRS 466 : 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 466 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:  
IS 14209: Epoxy enamel, two components, glossy — Specification  
The assistance de rived from the above source is hereby acknowledged with thanks.  
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 Consumer Protection Authority (RICA)  
Standards for Sustainability  
Yong Rui Mei In vestments Ltd  
AMACO Paints Ltd  
AMEKI Colour Ltd  
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)  DRS 466 : 2021  
v                ©RSB 2021  - All rights reserved  
 ROMAN Paints Ltd  
SHALOM Pa ints Ltd  
Rwanda  Standards Board  (RSB) – Secretariat  DRS 466 : 2021  
©RSB 2021  - All rights reserved                  vi 
 Introduction   
Epoxy paint is an excellent choice for covering garage, basement and patio floors. Epoxy coating uses a 
chemical mix of two liquid components, epoxy resin and hardener, to create a tough, solvent -resistant finish 
that can be applied to floors, countertops and decks. Many types of epoxy are noted for their durability and 
can be used to seal concrete floors, steel and other industrial materials.  
This product is expected to have adhesion on in organic zinc coating and epoxy -primers, high toughness and 
abrasion resistance. It is used as a finish coat for the painting of steel plant equipment where protection to salt 
water, chemicals, mineral oils, solvents and resistance to moisture protection in  marine environment.  
 
   DRS 466 : 2021  
1                ©RSB 2021  - All rights reserved  
 Two-Pack Epoxy enamel, glossy paint  — Specification  
1 Scope   
This Rwanda Draft Standard prescribes requirements, sampling and test methods for two components epoxy 
enamel used as a finish coat for the painting of steel plant equipment where protection to salt water, 
chemicals, mineral oils, solvents and resistance to moisture protect ion in marine environment.  
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 undate d references, 
the latest edition of the referenced document (including any amendments) applies.  
ISO 4618 , Paints and varnishes — Terms and definitions  
ISO 1523, Determination of flash point  — Closed cup equilibrium method  
ISO 9117 -1, Paints and varnishes — Drying tests — Part 1: Determination of through -dry state and through -
dry time  
ISO 9117 -3, Paints and varnishes — Drying tests — Part 3: Surface -drying test using ballotoni  
ISO 3251 , Paints, varnishes and plastics — Determination of non -volatile -matter content  
ISO 6503 , Paints and varnishes — Determination of total lead — Flame atomic absorption spectrometric 
method  
ISO 3856 -6, Paints and varnishes — Determination of “soluble” metal — Part 6: Determination of total 
chromium content of the liquid portion of the paint — Flame atomic absorption spectrometric method  
ISO 9514, Paints and varnishes  — Determination of the pot life of multicomponent coating systems — 
Preparation and condition of samples and guidelines for te sting.  
ISO 2808, Paints and varnishes — Determination of film thickness  
ISO 2813, Paints and varnishes — Determination of gloss value at 20 °, 60° and 85 ° 
ASTM F735 -17, Standard test method for abrasion resistance of transparent plastics and coatings using the 
oscillating sand method  
RS OIML R 87, Quantity of product in pre -packages  
ISO 15528 , Paints, varnishes and raw materials for paints and varnishes — Sampling   
©RSB 2021  - All rights reserved                  2 
 3 Terms and definitions   
For the purposes of this standard, the terms and definitions given in ISO 4618 and the following apply . 
3.1 
epoxy paint  
a latex acrylic product that may have a small amount of epoxy  in the mix and is used for flooring applications.  
3.2 
enamel  
is loosely used to designate a shiny, glossy, decorative topcoat.  
3.3 
component  
a term used to describe each of two parts of the paint, which when mixed together form the pigmented epoxy 
layer  
3.4 
epoxy primer  
a paint consisting essentially of epoxy resin base, polyamide, amine adduct or other hardeners with 
appropriate pigments, solven t and additives mixed together in the proportions recommended by the 
manufacturer  
3.5 
protective coating system  
sum total of coats of paint or related product which are to be applied or which have been applied to a 
substrate to provide corrosion protection  
3.6 
pot life  
the maximum time during which a coating material supplied as separate components should be used after 
they have been mixed together  
3.7 
volatile organic compound (VOC)  
fundamentally, any organic liquid and/or solid that evaporates spontaneously at the prevailing temperature 
and pressure of the atmosphere with which it is in contact    DRS 466 : 2021  
3                ©RSB 2021  - All rights reserved  
 3.8 
ready to use  
the state of a product when it is mixed in accordance with the manufacturer's instructions in the correct 
proportions and thinned if req uired using the correct thinners so that it is ready for application by the approved 
method.  
3.9 
marine environment  
oceans, seas, bays, estuaries, and other major water bodies, including their surface interface and interaction, 
with the atmosphere and with  the land seaward of the mean high water mark.  
3.10 
epoxy equivalent weight  
equivalent weight  of epoxy  resin = Molecular weight  of epoxy  resin. Number of epoxy  groups.  
4 Requirements  
4.1 General requirements  
4.1.1  Composition  
4.1.1.1  The product shall comprise of epoxy resin as the principal binder. The manufacturer shall specify that 
the principal type of binder used has epoxy equivalent weight in the range of 350 to 600.  
4.1.1.2  The product shall consist essentially of two component s base and hardener or catalyst solution to be 
mixed in a simple ratio by volume as specified by the manufacturer.  
4.1.2  Condition in the container  
When visually examined, the product  shall be free from skins, uncharacteristically coarse particles, foreign  
matter and lumps.  The container shall be free from rust and moulds.  
4.1.3  Odour  
The odour of the two -pack epoxy primer -marine paint in the container, during and after application shall not be 
abnormally pungent, offensive or disagreeable.  
4.1.4  Settling  
The epoxy primer shall be free from settling. Settling if any, shall be easily incorporated by stirring.   
©RSB 2021  - All rights reserved                  4 
 4.2 Specific requirements  
4.2.1  Specific requirements for wet coat  
The product  shall meet the specific requirements given  in Table 1  when tested in accordance with the test 
methods specified therein . 
Table 1 — Requirements for the wet coat of two -pack epoxy enamel  
S/N Parameters  Requirements  Test methods  
i.  Mass, kg/10L, min.  9 Annex A  
ii.  Consistency  Smooth and uniform  Annex B  
iii.  Flash point  Above 20 °C ISO 1523  
iv.  Drying time, h, 
max.  Surface dry  3 ISO 9117 -3 
Hard dry  24 ISO 9117 -1 
v.  Solids content, % by volume, min.  40 ISO 3251  
vi.  Pot life, h, min.  6 ISO 9514  
vii.  Total lead content, mg/Kg, max.  90 ISO 6503  
viii.  Total chromium content, mg/kg, max.  5 ISO 3856 -6 
NOTE – Tests from (i) to (vii) are for mixed paint.  
4.2.2  Specific requirements for dry coat  
The product  shall meet the specific requirements given  in Table 2 when tested in accordance with the test 
methods specified therein . 
Table 2 — Requirements for the dry coat of two -pack epoxy enamel  
S/N Parameters  Requirements  Test methods  
i.  Dry film thickness per coat, 
microns, min.  30 ISO 2808  
ii.  Finish  Smooth and glossy   
iii.  Gloss, 60 °, min.  61 ISO 2813  
iv.  Scratch hardness test (1500 g)  To pass the test  ASTM  F735 -17 
v.  Acid/alkali resistance (10% Nitric 
acid at 27 ± 2°C – 24h, 20% 
sulphuric acid at 27 ± 2°C – 16h, 
25% caustic soda at 27 ± 2°C – 
24h, 10% hydrochloric acid at 27 
± 2°C – 48h) The film shall not show 
signs of disintegration or 
change  of colour to a 
greater extent. The loss of 
gloss shall not be more 
than 50% of the original 
gloss.  - 
NOTE – Tests mentioned in (iv) and (v) shall be carried out for the full system that is 1 coat of 
primer, 1 coat of intermediate and 1 coat of finishing paint or 1 coat of primer and 1 coat of finishing 
paint supplied by the same firm after 168 hours curing at 30 °C   DRS 466 : 2021  
5                ©RSB 2021  - All rights reserved  
 5 Packaging and labelling  
5.1 Packaging  
5.1.1  The product  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:  
a) name of the product as:  “Two-pack epoxy enamel”; 
b) name and address of the manufacturer and/or registered trader mark;  
c) volume of the material, in L;  
d) date of manufacture;  
e) spreadin g capacity, in m2/L; 
f) instructions for use and disposal;  
g) pot-life at 25 0C; 
h) an indication of flammability.  
i) storage condition  
5.2.2  Each label of the container shall be marked legibly and indelibly with the following:  
a) Date of manufacture;  
b) Instructions for use;  
c) Pot-life; 
d) Shelf life;  
e) Colour;  
f) Batch number.   
©RSB 2021  - All rights reserved                  6 
 6 Sampling  
Sampling shall be done in accordance with ISO 15528.  
   DRS 466 : 2021  
7                ©RSB 2021  - All rights reserved  
 Annex  A 
(normative)  
 
Determination of mass per 10 litres  
A.1 General  
Method for determination of mass per 10 litres of liquid paints and related products by pyknometer or a mass 
per volume cup. It is determined at a specified temperature and is expressed in kg/10 litres or in grams per 
millilitre.  
A.2 Apparatus  
A.2.1  Pyknometer  – Of capacity 20 to 100 ml.  
A.2.2  Thermometer  – Graduated in divisi ons of 0.1 °C and accurate to 0.2 °C. 
A.2.3  Water -Bath or Constant temperature room  – Capable of being maintained within ± 2 °C. 
A.2.4  Analytical balance  – Accurate to 0.2 mg.  
A.3 Procedure  
A.3.1  Clean the pyknometer suitably (see note 1). Thoroughly dry the p yknometer. Allow the pyknometer to 
attain room temperature and weigh it. Fill the pyknometer with distilled water at a temperature not more than 1 
°C below the standard temperature (27 ± 2 °C). Stopper or cap the pyknometer leaving the overflow orifice 
open. Every care shall be taken to prevent the formation of bubbles in the pyknometer. Place the pyknometer 
in the constant temperature and its contents is constant. Remove the overflow by wiping with absorbent 
material (see note 2) and thoroughly dry the out side of the pyknometer by wiping with absorbent material. Do 
not remove any subsequent overflow (see note 3). Immediately weigh the filled apparatus to the nearest 
0.001% of its mass (see note 4).  
Note 1 – If it is a glass pyknometer, use chromic acid, dis tilled water and a solvent. If it is a metal pyknometer, use solvent 
which leaves no residue on evaporation.  
Note 2 – A paper tissue is recommended for this purpose.  
Note 3 – Handling the pyknometer with bare hands will increase the temperature and cause m ore overflow from the 
overflow orifice and will also leave finger prints, hence, handling only with tongs and with hands protected by clean, dry 
absorbent material is recommended.  
Note 4 – Immediate and rapid weighing of the filled pyknometer is recommende d in order to minimize loss in mass due to 
evaporation and overflow subsequent to the first wiping after attainment of temperature.   
©RSB 2021  - All rights reserved                  8 
 A.3.2  Repeat the above procedure using the product in place of distilled water. Remove any residues of 
paints from the outsi de of pyknometer by wiping with absorbent material moistened with a suitable solvent and 
thoroughly dry by wiping with a clean absorbent material.  
A.3.3  When using glass pyknometer with pigmented products, difficulties may be experienced in removing 
residu al pigments, especially from ground -glass surfaces. Such residues may be removed by ultrasonic 
vibration in water or solvent bath. To minimize errors, joints shall be firmly seated. For accurate determination, 
glass pyknometer are preferred. Metal pyknomet ers are generally used for determination of mass in kg/10 
litres for production control purposes. If the sample retains air bubbles, which do not readily disperse on 
standing, the methods described may be unsuitable.  
A.4 Calculations  
A.4.1  Calculation of volum e of the pyknometer  – Calculate the volume of pyknometer in millilitres as 
follows:  
      V=𝑚1−𝑚0
𝑑 
Where;  
  V = volume in ml of pyknometer,  
  m1 = mass in g of pyknometer and water,  
  m0 = mass in g of the empty pyknometer, and  
  d = density of water at 27 °C in g/ml (0.9965 g/ml).  
A.4.2  Calculation of density  – Calculate the density of the product in g/ml at the test temperature (27 °C) 
by the following formula:  
dt=𝑚2−𝑚0
𝑉 
Where;  
  dt = density of the product at test temperature (27 °C), 
  m2 = mass in g of the pyknometer and product,  
  m0 = mass in g of the empty pyknometer, and  
  d = volume in ml of the pyknometer at 27 °C.   DRS 466 : 2021  
9                ©RSB 2021  - All rights reserved  
 A.4.3  Calculation of mass in kg/10 litres of material – Calculate mass in kg/10 litres of the material fr om 
A.4.2 by multiplying the results by 10.  
A.4.4  Precision – With accurate control of temperature at ± 0.5 °C level, it is possible to achieve the 
following precision.  
A.4.4.1  Repeatability – The difference between two successive results obtained by the sa me operator within 
a short time interval, with the same apparatus under constant operating conditions in identical test material, 
shall not exceed 0.0006 g/ml at the 95% confidence level.  
A.4.4.2  Reproducibility – The difference between single and independ ent results obtained by different 
operators in different laboratories in identical test material shall not exceed 0.0012 g/ml at the 95% confidence 
level.  
A.4.4.3  In case of some liquid paint products, especially those showing structure viscosity or thixot ropy, the 
above precision limits may not be obtainable.  
 
   
©RSB 2021  - All rights reserved                  10 
 Annex  B 
(normative)  
 
Determination of consistency  
B.1 Scope  
It prescribes three methods for determining the dynamic viscosity of paints and related products at a rate of 
shear not less than 5000 S-1and not more than 20000 S-1. The methods are:  
a) Flow cup method,  
b) Cone and plate or concentric cylinder viscometer method, and  
c) Stromer viscometer method.  
B.2 Flow cup method  
B.2.1  Apparatus  
B.2.1.1  Flow cup  
B.2.1.1.1  Dimensions  
The dimensions of the flow cup and the tolerances allowed in manufacture shall be as given figure 1. The 
most critical tolerance is internal diameter of the jet of the cup since the flow time is inversely proportional to 
the fourth power of this dimension. The jet of the cup shall be made of st ainless steel or sintered carbide, 
unless specified otherwise, and the body of the cup shall be made of a material which is corrosion resistant 
and not affected by the products to be tested.    DRS 466 : 2021  
11                ©RSB 2021  - All rights reserved  
  
Figure 1 – Flow cup  
B.2.1.1.2  Constructions  
The dimensions not specified shall be such that no distortion of the cup can occur in use. The external shape 
shown in figure 1 is recommended, but may be modified for convenience of use or manufacture, provided that 
the protruding jet of the cup is protected from accidental  damage as far as possible by an external protective 
sleeve, such a protective sleeve shall not be immediately adjacent to the jet so as to cause a capillary action 
when the material under test flows out.  
B.2.1.1.3  Finish  
The interior surface of the cup, i ncluding the orifice shall be smooth and free from turning marks, crevices, 
ledges and burrs which may cause random flow or trap some sample or cleaning material. The standard of 
finish required shall be equivalent to a maximum roughness of not more than 0 .5 µm defined as the arithmetic 
mean deviation Ra from the mean line of the profile.  
B.2.1.2  Thermometer, accurate to 0.2 °C and graduated at 0.1 °C intervals.  
B.2.1.3  Stand, suitable for holding the flow cup and provided with levelling screws.  
B.2.1.4  Spirit level, preferably of the circular type.  
B.2.1.5  Flat glass plate of straight edge scraper  
 
©RSB 2021  - All rights reserved                  12 
 B.2.1.6  Stop watch, or other suitable timing device with scale divisions of 0.2 second or finer and accurate 
to within 0.1 % when tested over a 60 -minute period.  
B.2.1.7  Temperature controlled room or enclosure for maintaining the cup and sample at a constant 
temperature.  
B.2.2  Procedure  
B.2.2.1  Place the flow cup on the stand in a place free from draughts, at ambient temperature. Level by the 
use of a spirit level  placed on the rim.  
B.2.2.2  Strain the sample into a clean container and adjust the temperature to meet the requirement. A 150 
micro sieve or finer, is suitable. This and the following operations shall be carried out with minimum delay to 
avoid loss of sol vent.  
   DRS 466 : 2021  
13                ©RSB 2021  - All rights reserved  
 Bibliography  
[1] IS 101 -1-7, Methods of sampling and test for paints, varnishes and related products — Part 1: Test on 
liquid paints (general and physical) — Section 7: Mass per 10 litres.  
[2] IS 101 -1-5, Methods of sampling and test for paints, var nishes and related products — Part 1: Test on 
liquid paints (general and physical) — Section 5: Consistency.  
 
 DRS 466 : 2021  
 
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