ICS 87.040  
 
Reference number  
DRS 464 -2: 2021  
© RSB 2021  
  
 RWANDA 
STANDARD  DRS 
464-2  
 
First edition  
2021-mm-dd 
 
Putty powders  — Specification  — 
Part 2: 
Exterior walls  
   
RS 464-2: 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.rs b.gov.rw  
ePortal: www.portal.rsb.gov.rw   DRS 464 -2: 2021  
iii                ©RSB 2021  - All rights reserved  
 Contents  Page 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  2 
4 Requirements  ................................ ................................ ................................ ................................ .........  2 
4.1 General requirem ents ................................ ................................ ................................ ...........................  2 
4.2 Specific requirements  ................................ ................................ ................................ ...........................  2 
5 Packaging, storage and labelling  ................................ ................................ ................................ ........  3 
5.1 Packaging  ................................ ................................ ................................ ................................ ...............  3 
5.2 Storage  ................................ ................................ ................................ ................................ ...................  3 
5.3 Labelling  ................................ ................................ ................................ ................................ .................  3 
6 Sampling  ................................ ................................ ................................ ................................ ................  4 
Annex  A (normative)  Determination of resistance to acid/alkali  ................................ ................................ .. 5 
A.1 Principle  ................................ ................................ ................................ ................................ .................  5 
A.2 Apparatus  ................................ ................................ ................................ ................................ ...............  5 
A.3 Test specimens  ................................ ................................ ................................ ................................ ...... 5 
A.4 Reagents  ................................ ................................ ................................ ................................ ................  5 
A.5 Procedure  ................................ ................................ ................................ ................................ ...............  5 
 RS 464-2: 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 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 464-2 was prepared by Technical Committee RSB/TC 056, Paints, Varnishes, Adhesives and Related 
Products.  
DRS 464 consists of the following parts, under the general title Putty Powders — Specification : 
 Part 1: Interior walls  
 Part 2: Exterior walls  
Committee membership  
The following organizations were represented on the Technical Committee on Paints, Varnishes, Adhesiv es 
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 Investments 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)  DRS 464 -2: 2021  
v                ©RSB 2021  - All rights reserved  
 Rwanda Forensic Laboratory (RFL)  
ROMAN Paints Ltd  
SHALOM Paints Ltd  
Rwanda  Standards Board  (RSB) – Secretariat  RS 464-2: 2021  
©RSB 2021  - All rights reserved                  vi 
 Introduction   
Putty powder is a surface filling material for pre -treatment of the construction surface before paint 
construction. The main purpose is to fill the pores of the construction surface and correct the curve deviation 
of the construction surface, so as to lay a solid foundation for obtaining a uniform and smooth paint surface. 
The finished putty is divided into: general putty and water -resistant putty. General putty is used in places 
where water resistance is not required. Water -resistant putty is used in places where water resistance and 
high bonding strength are required. It is composed of double fly powder, ash calcium powder, cement, organic 
rubber powder, water retaining agent, etc. With water resistance, alkali resistance and bonding strength. The 
disadvantage of both general type putty and water -resistant putty is its poor versatility. As general type putty is 
not water -resistant, it can only be caused by room surface equipment such as living room. Althou gh water -
resistant putty powder has good water resistance, its whiteness and texture are not enough, it is generally 
only used in the bathroom.  
Putty is divided into two types: interior wall and exterior wall. The exterior wall putty has to resist wind an d sun, 
so it has high adhesiveness, high strength and slightly lower environmental protection index. Exterior wall 
putty powder is mainly used for cement and concrete walls. With the prolonged use of the building or other 
external reasons, the exterior sur face of the building will have paint peeling off, wall cracking or tile peeling off, 
mainly because Traditional putty powder has defects such as poor weather resistance and weak adhesion.  
 
 DRS 464 -2: 2021  
1                ©RSB 2021  - All rights reserved  
 Putty powders — Specification — Part 2: Exterior walls  
1 Scope   
This Draft Rwanda Standard specifies requirements, sampling and test methods for putty powders  for exterior 
walls.  
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 referenced document (including any amendments) applies.  
ISO 8130 -14, Coating powders  — Vocabulary  
ISO 8130 -1, Coating powders — Part 1: Determination of particle size distribution by sieving  
ISO 20566, Paints and varni shes — Determination of the scratch resistance of a coating system using a 
laboratory car -wash  
ISO 9117 -3, Paints and varnishes — Drying tests — Part 3: Surface -drying test using ballotini  
ASTM G139 – 05, Standard test method for determining stress -corrosi on cracking resistance of heat -treatable 
aluminium alloys products using breaking load method  
ISO 11503, Paints and varnishes — Determination of resistance to humidity (Intermittent condensation)  
ISO 11998, Paints and varnishes — Determination of wet -scrub  resistance and cleanability of coatings  
ISO/TR 19402, Paints and varnishes — Adhesion of coatings  
ISO 17132 , Paints and varnishes — T-bend test  
ISO 8130 -8, Coating powders — Part 8: Assessment of the storage stability of thermosetting powders  
ISO 11890 -2, Paints and varnishes — Determination of volatile organic compounds (VOC) and/or semi -
volatile organic compounds (SVOC) content — Part 2: Gas -chromatographic method  
ISO 15234 , Paints and varnishes — Testing of formaldehyde -emitting coatings and melamine foams — 
Determination of  the steady -state concentration of formaldehyde in a small test chamber  
ISO 6503 , Paints and varnishes — Determination of total lead — Flame atomic absorption spectrometric 
method   
©RSB 2021  - All rights reserved                  2 
 ISO 3856 -4, Paints and varnishes — Determination of  “soluble” metal content — Part 4: Determination of 
cadmium content — Flame atomic absorption spectrometric method and polarographic method  
ISO 3856 -6, Paints and varnishes — Determination of “soluble” metal content — Part 6: Determination of total 
chromium content of the liquid portion of the paint — Flame atomic absorption spectrometric method  
RS OIML R 87 , Quantity of product in pre -packages  
ISO 8130 -9, Coating powders — Sampling  
3 Terms and definitions   
For the purposes of this standard, the terms and definitions given in ISO 8130 -14 and the following apply.  
3.1 
putty powder  
a surface filling material for pre -treatment of the construction surface before pa int construction.  
4 Requirements  
4.1 General requirements  
4.1.1   The product shall be free flowing powder based on synthetic resins such as polyester/TGIC 
(triglycidyl isocyanurate)  and polyurethane, hardeners, pigments, fillers and additives suitable for applic ation, 
for example, electrostatic spraying, tribostatic spraying, fluidized bed coating, etc.  
4.1.2  The product shall be free from carcinogenic ingredients.  
4.1.3  It shall give a continuous, smooth and hard film when applied and stoved as per schedule pres cribed 
by the supplier  
4.1.4  The particle size distribution , when tested in accordance with ISO 8130 -1 and the application 
parameters shall be as agreed between supplier and the user.  
4.1.5  The product shall not demonstrate evidence  of biological growth  and/or any type of reaction with the 
container ; 
4.1.6  The product  shall show  no evidence of biological growth, corrosion of the container and shall be 
uniform, free from lumps  and foreign material . 
4.2 Specific requirements  
The product shall comply with the requirements given in Table 1 when tested in accordance with the methods 
prescribed therein.  DRS 464 -2: 2021  
3                ©RSB 2021  - All rights reserved  
 Table 1 – Specific requirements of Putty powder for exterior walls  
S/N Parameters  Requirements  Test methods  
2 Constructability  Scratch -free ISO 20566  
3 Drying time, h, max . 5 ISO 9117 -3 
4 Initial drying resistance to cracking 
(test condition; 6h)  Dynamic, No crack  ASTM G139 - 05 
 
6 Water absorption, g/10min, max.  2 ISO 11503  
7 Wet-scrub resistance  (test condition: 
96h) No abnormality  ISO 11998  
8 Alkali -resistance (test condition: 48h)  No abnormality  Annex A  
9 Adhesive/bonding 
strength , mPa , 
min. Standard states  0.60 
ISOTR 19402  Freeze -thaw 
cycles (5 times)  0.40 
11 Stress cracking resistance (mm)  No visible damage or 
detachment of film after 
48 h ISO 17132  
12 Low temperature storage stability (at 
- 5°C for 4 hours)  No difficult in knife 
coating smoothly  ISO 8130 -8 
12 Volatile organic compounds  Absent  ISO 11890 -2 
13 Formaldehyde, mg/Kg, max.  Absent  ISO 15234  
14 Lead, content, mg/Kg, max.  90 ISO 6503  
 Cadmium content, mg/Kg, max  5 ISO 3856 -4 
15 Chromium (VI) content, mg/Kg, max.  5 ISO 3856 -6 
 
5 Packaging, storage and labelling  
5.1 Packaging  
5.1.1  The product shall be packaged in suitable containers that are strong enough to withstand normal 
usage and transportation and that prevent leaking, drying out and contamination of the product.  
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 Storage  
The product shall be stored in a coo l and dry place at room temperature and at a relative humidity not more 
that 65%. Direct exposure of the powder to heat or sunlight must be avoided, the storage life of powders 
under above conditions will not be less than 6 months after the manufacturing d ate. 
5.3 Labelling   
Each container, or a label securely fixed to the container, shall be clearly, legibly and indelibly marked with the 
following information:  
a) the name of product as “Putty powder for exterior walls;   
©RSB 2021  - All rights reserved                  4 
 b) the manufacturer’s name and full address;  
c) batch identification;  
d) date of manufacture;  
e) expiry date;  
f) net weight;  
g) country of origin; and  
h) instructions for use.  
6 Sampling  
Representative samples of the product shall be drawn as prescribed in ISO 8130 -9. 
 DRS 464 -2: 2021  
5                ©RSB 2021  - All rights reserved  
 Annex  A 
(normative)  
 
Determination of resistance to aci d/alkali  
A.1 Principle  
The method covers the determination of the resistance to failure, in an accelerated manner, of powder 
coatings when immersed in acid and alkali solutions for a fixed period.  
A.2 Apparatus  
A.2.1  Containers – Corrosion resistant containers eq uipped with the means to control the solution 
temperature within 60 ± 1 °C and to control the liquid level at 5 mm.  
A.2.2  Cover – The container shall be provided with covers to retard evaporation and to contain the test 
specimens completely.  
A.3 Test specimens  
Unless otherwise specified, the test specimens shall be 100mm x 300 mm x 0.9 mm in size.  
A.4 Reagents  
A.4.1  Hydrochloric acid, 10%.  
A.4.2  Nitric acid, 10%.  
A.4.3  Sulphuric acid, 20%.  
A.4.4  Sodium hydroxide, 25%.  
A.5 Procedure  
A.5.1  Immersion – Suspend the test specimens vertically in the container so that at least one half of the 
surface area in submerged in the solutions in the order nitric acid, sulphuric acid, hydrochloric acid and 
sodium hydroxide for a period of 12 h each. Separate the tes t specimens so that they are not in contact with 
any metal and are no closer together than 25mm at any point in the bath. Replace the test solutions with fresh 
solutions every 168 h. if successive tests are to be correlated, use reference panels coated wit h a control 
paint.  
A.5.2  Examination of specimens – When the specimens are ready for transfer and/or examination, 
carefully remove, gently wash or dip in clean running water not warmer than the temperature of the test 
solution to remove the excess solution  from the surface, and then carefully dry by blowing with air or blotting  
©RSB 2021  - All rights reserved                  6 
 with absorbent paper. Examine the test coating for blisters, flaking and corrosion. The sample shall be treated 
as passing if there is no blistering, flaking and corrosion.  
 
  DRS 464 -2: 2021  
7                ©RSB 2021  - All rights reserved  
 Bibliography  
[1] IS 13871, Powder coatings — Specification , 1993  
 
 DRS 464 -2: 2021  
 
Price based on  6 pages  
©RSB 2021  - All right s reserved