Reference number  
DRS 378 -3: 2017  
© RSB 2017  
 
 
 RWANDA 
STANDARD  DRS 
378-3 
 
First edition  
2017 -mm-dd 
 
Flexible polyurethane foam for mattresses — 
Specification — Part 3: Reconstituted flexible 
polyurethane foam  
 
  DRS 378-3: 2017  
©RSB 2017 - 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 2017  
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. +250 252 586103/ 582945  
Toll Free: 3250  
E-mail: info@rsb.gov.rw  
Website: www.rsb.gov.rw  DRS 378 -3: 2017  
iii                ©RSB 2017 - All rights reserved  
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Term s and definitions  ................................ ................................ ................................ ...........................  1 
4 Requirements  ................................ ................................ ................................ ................................ .........  1 
4.1 General  ................................ ................................ ................................ ................................ ....................  1 
4.2 Class of foam  ................................ ................................ ................................ ................................ ..........  1 
4.3 Density and hardness  ................................ ................................ ................................ ...........................  2 
4.3.1  Density  ................................ ................................ ................................ ................................ ....................  2 
4.3.2  Hardness  ................................ ................................ ................................ ................................ .................  2 
4.4 Flammability  ................................ ................................ ................................ ................................ ...........  2 
4.5 Other physical properties  ................................ ................................ ................................ .....................  3 
4.6 Shapes and dimensions  ................................ ................................ ................................ .......................  3 
5 Packing and marking  ................................ ................................ ................................ ............................  4 
5.1 Packing  ................................ ................................ ................................ ......Error! Bookmark not defined. 4 
5.2 Marking  ................................ ................................ ................................ ................................ ....................  4 
5.3 Additional Marking for Type 2 and Type 4 Mattresses  ................................ ................................ .... 45 
6 Sampling  ................................ ................................ ................................ ................................ ................  5 
 DRS 378-3: 2017  
©RSB 2017 - 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 ratifie d by me mbers of RSB Board of Director s for publication and 
gazettment as Rwanda Standards.  
DRS 378-3 was prepared by Technical Committee RSB/TC 024, Chemicals and Consumer Products ,. 
In the preparation of this standard, reference was made to the following standard  : 
EAS 7 -3, Flexible polyurethane foam for mattresses — Specification — Part 3: Reconstituted flexible 
polyurethane foam  
The assistance derived from the above source is hereby acknowledged with thanks.  
DRS 378 consists of the following parts, under the general title Flexible polyurethane foam for mattresses — 
Specification:  
DRS 378-1 Flexible polyurethane foam for mattresses — Specification — Part 1: General requirements  
DRS 378-2 Flexible polyurethane fo am for mattresses — Specification — Part 2: Mattresses   
DRS 378-3, Flexible polyurethane foam for mattresses — Specification — Part 3: Reconstituted flexible 
polyurethane foam  
Committee membership  
The following organizations were represented on the Technical Committee on , Chemicals and Consumer 
Products ,(RSB/TC 024) in the preparation of this standard.  
Paragraph of participants  
Rwanda  Standards Board (RSB) – Secretariat  
 DRS 378 -3: 2017  
1                ©RSB 2017 - All rights reserved  
 Flexible polyurethane foam for mattresses — Specification — 
Part 3: Reconstituted flexible polyurethane foam  
1 Scope  
This Part 3 of this Draft Rwanda Standard covers the requirements for seven c lasses (based on density) of 
reconstituted flexible polyurethane foams, in the form of blocks, slabs, sheets and shapes cut from these  
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.  
DRS 378 -1, Flexible polyurethane foam for mattresses — Specification — Part 1: General requirements  
3 Terms and definitions  
For the purposes of this standard, the terms and definitions given in DRS 378 -1 and the following apply.   
3.1  
reconstituted foam  
A composite material that consists of chips of flexible polyurethane foam (of the polyurethane or the polyester 
type or of the mixture of these types) held together by means of a suitable binder . 
4 Requirements  
4.1  General  
The foam shall be a reconstituted foam, shall be non -toxic, and shall be free from objectionab le odour. The chip 
structure shall be acceptably uniform, and the largest dimension of any void between the chips shall not exceed 3 
mm except in the case of foams of classes 56 and 64, where the largest dimension of any void shall not exceed 6 
mm. In the cases of trimmed blocks, slabs, sheets and shapes cut from any of these, the surfaces shall be smooth 
and free from cuts and tears.  
4.2  Class of foam  
The class of foam shall be one of the following:  
Class 56, 64, 80, 96, 117, 145, or 160.   
©RSB 2017 - All rights reserved                  2 
 4.3 Density and hardnes s 
4.3.1  Density  
The density of a foam, determined in accordance with EAS 7 -1, shall be within the appropriate limits given in 
Columns 2 and 3 of Table 1.  
4.3.2   Hardness  
The hardness factor of a foam, determined in accordance with EAS 7 -1, shall be as follows:  
a) Class 5 6, Class 64, Class 80 and Class 96 foams — Within the limits given in Columns 5 and 6 of Table 1 
appropriate to the class of foam and to one of the nominal values given in Column 4 of Table 1.  
b) Class 117, Class 145 and Class 160 foams — At least equal to the appropriate minimum given in Column 
5 of Table 1.  
Table 1 — Density and hardness factor  
1 2 3 4 5 6 
 Density, kg/m3 Hardness factor  
 Nominal  Actual  
 min. max.   min. max.  
56 — 56 10 
17 7 
14 14 
21 
64 56 72 19 
30 14 
25 24 
35 
80 72 88 30 
40 25 
35 35 
45 
96 88 104 45 
51 38 
42 52 
60 
117 104 130 52 52 — 
145 130 160 63 63 — 
4.4 Flammability  
When a foam is tested in accordance with EAS 7 -1: 
a) no specimen shall burn for 3 minutes or more, and  
b) no specimen shall burn beyond the gauge line.  DRS 378 -3: 2017  
3                ©RSB 2017 - All rights reserved  
 4.5 Other physical properties  
When tested in accordance with the relevant methods referred to in EAS 7 -1 the foam shall comply with the 
requirements given in Table 2.  
Table 2 — Other physical properties  
1 2 3 4 5 6 7 8 
Property  56 64 80 96 117 145 160 
 
1. Compression set, %, max. ......   
25  
20  
15  
15  
12   
2. Tensile strength         
 a)   Tensile strength         
  1)   original, kPa, min.  40 40 45 45 45 45 45 
  2)   after heat aging, kPa, min.  40 40 45 45 45 45 45 
  3)   after humid aging, kPa, min.  40 40 45 45 45 45 45 
 b)   Elongation at break         
  1)   original, %, min.  50 90 90 90 75 50 50 
  2)   after heat aging, % min.  50 90 90 90 75 50 50 
  3)   after humid aging, %, min.  50 90 90 90 75 50 50 
3. Tear resistance, N/mm of width, min.  0.09 0.26 0.35 0.35 0.35 0.26 0.26 
4. Fatigue resistance         
 (a) Retention of hardness factor, %, mm  — 80 82.5 82.5 85 — — 
 (b) Loss in height, %, max.  — 5 4 4 3 — — 
4.6 Shapes and dimensions  
The foam shall be supplied in the form of blocks, trimmed blocks, slabs, or sheets cut from trimmed blocks, or 
other shapes cut from any of these forms, as specified by the purchaser. The size of blocks (nominal 
dimensions and the tolerances on those) shal l be as specified by the purchaser. In the cases of trimmed 
blocks, sheets, and other shapes, the nominal dimensions shall be as specified by the purchaser, and the 
actual dimensions, measured in accordance with EAS 7 -1, shall not differ from the nominal v alues by more 
than the appropriate tolerances given in Table 3.  
   
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 Table 3 — Tolerances on dimensions (other than of blocks)  
1 2 3 
Magnitude of dimension,  
D, mm   Tolerance, mm (unless otherwise stated)  
Length and width  Thickness  
      
D 25 - 5 +10 %  - 5 +10 %  
25<D 150 - 0 +6.5 - 0 +4.8 
151<D 300 - 0 +6.5 - 0 +6.5 
      
301<D 600 - 0 +12.5  - 0 +12.5  
601<D 000 - 0 +20 - 0 +20 
1001<D 500 - 0 +30 —  
      
1501<D 000 - 0 +40 —  
D>2 000 - 0 +45 —  
      
5 Packing   
Mattresses shall be individually wrapped in sealed polyethylene bags that are strong enough to prevent any damage, gross 
distortion and nicking to contents during storage and transportation.  
6 Marking  
The following information shall appear in legible and indelible marking on a strong durable label that is firmly sewn to the 
outside of the ticking of each mattress:  
a) name and address of manufacturer;  
b) lot or batch number;  
c) dimensions;  
d) density class of foam;  
e) country of origin.  
6.1 Additional Marking for Type 2 and T ype 4 Mattresses  
A Type 2 or Type 4 mattress shall have information indicating which sleeping surface provides a soft or a firm support, 
printed prominently in legible and indelible block letter (of height at least 30 mm) on a strong, durable lable that is  firmly 
sewn to the ticking of the sleeping surfaces.  DRS 378 -3: 2017  
5                ©RSB 2017 - All rights reserved  
 7 Sampling  
The following sampling procedure shall be applied in determining whether a lot complies with the requirements of the 
specification. The samples so taken shall be deemed to represent the lot.  
Take at random from the lot the number of samples shown in Table 4, Column 2 relative to the appropriate lot size shown in 
Column 1. Each sample shall consist of:  
a) For inspection — A complete piece,  
b) For testing — Pieces of total volume at least 0.01 m3. 
Table 4 — Sample size  
1 2 
Size of lot, L, m3  Number of samples  
L ≤ 8  2 
8 < L ≤ 15  3 
15 < L ≤ 25  5 
25 < L ≤ 50  8 
50 < L ≤ 100  13 
8 Compliance with the specificatio n 
The lot shall be deemed to comply with the specification if, after inspection and testing of the samples taken in accordance 
with Clause 6, no defective sample is found  
  
 
  
©RSB 2017 - All rights reserved                  6 
 Bibliography  
[1] ISO/IEC Directives, Part  2, Rules for the structure and drafting of International Standards , 2016  
 DRS 378-3: 2017  
ICS 97.140 
 
©RSB 2017  - All right s reserved