ISO/TR 9705-2:2001

TECHNICAL ISO/TR
REPORT 9705-2
First edition
2001-05-01
Reaction-to-fire tests — Full-scale room
tests for surface products —
Part 2:
Technical background and guidance
Essais de réaction au feu — Essais dans une pièce en vraie grandeur pour
les matériaux de revêtement intérieur —
Partie 2: Données techniques et lignes directrices
Reference number
©
ISO 2001
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ii © ISO 2001 – All rights reserved

Contents Page
Foreword.iv
Introduction.v
1 Scope .1
2 Characteristics of the ignition sources .1
2.1 Standard ignition source .1
2.2 Alternative ignition source .1
3 Sensitivity analyses.6
3.1 General.6
3.2 Specimen configurations.6
3.3 Effect of the burner size.7
3.4 Effect of the stand-off distance of the burner.7
4 Heat balance in the room .7
4.1 General.7
4.2 Heat release by combustion.7
4.3 Heat loss by convection.8
4.4 Heat loss by conduction .8
4.5 Heat loss by radiation .8
4.6 Results of heat balance calculations.9
5 Measuring techniques.9
5.1 Mass flow through the doorway and interface height .9
5.2 Measurement of toxic gases.10
5.3 Mass loss rate from the sample .10
6 Extended calculations.10
6.1 Filling time of room and hood .10
6.2 Prediction of mass flow and interface position.11
6.3 Estimate of sample mass loss.14
6.4 Fire growth models.14
7 Precision data .14
7.1 General.14
7.2 ISO round robin.15
7.3 ASTM round robin .16
8 Other test protocols using similar equipment.16
9 Specimen mounting .17
Annex A Calculation of HRR by means of different gas analysis data.18
Annex B Practical example of the measurements of toxic gases by FTIR and ion chromatography .26
Annex C Estimation of mass loss rate by means of HRR and gas analysis measurements.32
Annex D Overview of other test protocols using similar equipment .35
Bibliography.38
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
The main task of technical committees is to prepare International Standards. Draft International Standards adopted
by the technical committees are circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting a vote.
In exceptional circumstances, when a technical committee has collected data of a different kind from that which is
normally published as an International Standard ("state of the art", for example), it may decide by a simple majority
vote of its participating members to publish a Technical Report. A Technical Report is entirely informative in nature
and does not have to be reviewed until the data it provides are considered to be no longer valid or useful.
Attention is drawn to the possibility that some of the elements of this part of ISO/TR 9705 may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO/TR 9705-2 was prepared by Technical Committee ISO/TC 92, Fire safety, Subcommittee SC 1, Fire initiation
and growth.
ISO 9705 consists of the following parts, under the general title Reaction-to-fire tests — Full-scale room tests for
surface products:
� Part 1: Full-scale test for surface products (currently published as ISO 9705:1993,Fire tests — Full-scale room
test for surface products)
� Part 2: Technical background and guidance [Technical Report]
iv © ISO 2001 – All rights reserved

Introduction
ISO 9705:1993 specifies a test method simulating a fire that starts under well-ventilated conditions, in a corner of a
small room with a single open doorway.
The method is intended to evaluate the contribution to fire growth provided by a surface product using a specified
ignition source. The method provides data for a specified ignition source for the early stages of a fire from ignition
up to flashover. ISO 9705:1993 also describes different measurement techniques inside and outside the room. This
part of ISO 9705 gives background information and support to the potential users of the test. It gives the user of the
test technical information on the ignition source, heat fluxes in the room from the burner, heat balance in the room
during a fire, aspects of smoke production and toxic gas species production, as well as aspects of modelling the
results of these tests. It gives the user the information necessary to select the testing procedure for specific projects
or regulations.
TECHNICAL REPORT ISO/TR 9705-2:2001(E)
Reaction-to-fire tests — Full-scale room tests for surface
products —
Part 2:
Technical background and guidance
1 Scope
This part of ISO 9705 provides guidance on ISO 9705:1993. It describes the technical background of the test and
gives information which may be used for determining a testing procedure for a specific scenario, or how results can
be utilized in a total hazard analysis for the specified scenario.
2 Characteristics of the ignition sources
2.1 Standard ignition source
The standard ignition source consists of a sandbox burner with dimensions of 0,17 m � 0,17 m. This source is used
in reference [1] (see Bibliography). An important characteristic of the ignition source is its heat transfer towards the
material. Figures 1 and 2 show a detailed mapped overview of the total heat flux towards the specimen and the gas
temperatures. The measurements are performed in an open wall configuration, at an energy release rate level of
100 kW [2]. These values will slightly change when the burner is located in a room environment. Figures 3 and 4
give the contours of a constant heat flux of 10 kW/m at different heat outputs of the burner and also where areas
of total heat flux are higher than a given value.
2.2 Alternative ignition source
One of the alternative heat sources is a box burner, with dimensions of 0,3 m � 0,3 m. It is described in
ASTM E603-98 [3]. Figures 5 and 6 give a detailed mapping of heat fluxes and gas temperatures for a burner
energy release rate of 160 kW [2]. Other heat sources may be more appropriate (see annex B of ISO 9705:1993).
Figure 7 gives results of heat fluxes towards the specimen for a heat source level of 40 kW and 160 kW, with
different gases (natural gases and a mixture of natural gas and toluene) [4]. Figures 8 and 9 show a comparison of
different burner sizes for contours of constant heat flux of 10 kW/m , at an energy release rate of 100 kW in an
open corner and for areas exposed to a certain irradiant heat flux [4].
Finally, an example is given of the difference between the total heat flux produced by a burner in a corner and a
wall position. Table 1 gives an overview of the total heat flux towards the floor and the total heat flux to the wall at
0,9 m and 1,5 m height for energy release rates of 40 kW and 160 kW using the alternative ignition source of
ISO 9705:1993. Results show that, for the corner position, heat flux levels are higher in almost all cases.
Figure 1 — Heat flux distribution at an energy Figure 2 — Gas temperature distribution 30 mm
release rate of 100 kW for the standard ignition from the wall at an energy release rate of 100 kW
source in an open corner for the standard ignition source in an open corner
2 © ISO 2001 – All rights reserved

NOTE Contours of 10 kW/m .
Figure 3 — Contours of constant heat flux for the standard ignition source in an open corner at different
irradiant heat flux levels
Figure 4 — Areas of total heat flux levels higher than a given value for the standard ignition source at
different irradiant heat flux levels in an open corner
Figure 5 — Heat flux distribution at 160 kW for the Figure 6 — Gas temperature distribution 30 mm
alternative ignition source in an open corner from the wall at 160 kW for the alternative ignition
source in an open corner
4 © ISO 2001 – All rights reserved

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