ISO/TR 09705-2:2001 pdf download

ISO/TR 09705-2:2001 pdf download.Reaction-to-fire tests-Full-scale room tests for surface products – Part 2: Technical background and guidance.
5.2 Measurement of toxic gases
Additional to the measurement techniques given ISO 9705, techniques such as FTIR and ion chromatography have recently been applied successfully in fiji-scale tests. A practxal example how this can be performed is given in annex B. The reader is also referred to the documents developed within ISO/TC 92)SC 3 for a complete overview of the measurement of toxic gases in combustion gases produced in fire tests.
5.3 Mass loss rate from the sample
Direct mass loss measurements of the linings can be performed by means of putting the complete room on load cells or by putting the structure on which the linings are fixed on load cells. Due to the high tare value obtained by the weight of the room, it shouki be noted that only limited accuracy can be obtained. For items positioned in the room, a weighing platform as used in furniture calorimeters can be used and has been successfully applied.
6 Extended calculations
6.1 FIlling time of room and hood
At th€ beginning of a test there is some delay time In order to fill the part above the soffit level of the door in the room. FiNing of the hood in the beginning of the test is almost negligible since the smoke gases will enter immediately into the duct. Some filling of the hood might occur later on in the test if the extraction rate is dose to the limit of the system. This Is close to flashover conditions If the maximum exhaust flow rate Is used. Delay time correction can be easIy incorporated into the time shifting of the data.
6.3 Estimate of sample mass loss
When no mass loss measurements are made during tests it is possible to estimate the mass loss rate as a function of time using one of two methods. The first method is to divide the measured heat release by an effective heat of combustion of the product, which might be determined, for example, in the cone calorimeter. The second method is to estimate the mass loss rate by means of the gas analysis measurements. A procedure for this method is outlined in annex C [13].
6.4 Fire growth models
The test results of a room corner test may be predicted by means of a simulation model which calculates wall fire growth in a small room. An extensive overview of modelling full-scale test results is given in ISO/TR 11696. Fundamental solutions for fire growth need to address various phenomena such as heat transfer, fluid dynamics and combustion. Most of the developed models have introduced some simplifications for those problems.
They can be divided into a number of categories, as follows.
Models applying straightforward empirical or statistical methods and using small scale data obtained directly from one or more test methods such as the cone calorimeter (ISO 5660) and the LIFT apparatus. Although they use a considerable number of simplifications, their predictions have been successful. Most of them are limited to one specific scenario, but extensions to other scenarios are possible by using other empirical parameters.
Models applying semi-material characteristics. These semi-material characteristics are calculated from the small scale data obtained in, for example, the cone calorimeter (ISO 5660) and the LIFT apparatus and can be considered as a derivative or mean value of a fundamental material characteristic. Examples of such characteristics are mean kp c, ignition temperature, etc. Most of these models also show satisfactory results and are applicable for more than one scenario.
— Models applying fundamental material characteristics. Most of these models use characteristics which are less easy to determine with standard reaction to fire apparatuses, but some progress has been made in recent years. They have, however, been limited to certain products. In most cases these are sub-models describing one type of flame spread (e.g. horizontal flame spread) and they must be incorporated in a zone on field model.
For a description of the different developed models see ISOITR 11696.
7 Precision data
7.1 General
Two round robins on the room corner test have been conducted in recent years. First, an initial round robin with five laboratories was carried out prior to the circulation of ISO/DIS 9705 [14].