ISO/TS 5660-5-2020 pdf free.Reaction-to-fire tests — Heat release,smoke production and mass loss rate.
1.Scope: This document specifies the apparatus and procedure for measuring reaction to fire behaviour underreduced oxygen atmospheres. Continuous measurements are made to calculate heat release rates,smoke and specific gas production rates, and mass loss rates. Ignition time measurements are alsomade and ignition behaviour is obtained. Pyrolysis parameters of specimens exposed to controlledlevels of irradiance and controlled levels of oxygen supply can be determined as weil.
Different reduced oxygen atmospheres in the test environment are achieved by controlling the oxygenvolume concentration of input gas fed into the chamber (vitiation) or by controlling the total volume ofatmosphere fed into the chamber (ventilation).Ranges of oxygen volume concentration below 20,95 %of oxygen can be studied. The apparatus is not intended to control enriched oxygen conditions aboveatmospheric 20,95 % oxygen concentration.
The measurement system prescribed in this document is based on the cone calorimeter apparatusdescribed in ISO 5660-1.Therefore, this document is intended to be used in conjunction with ISO5660-1.
2.Normative references: The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments) applies.
3.1.ambient atmosphere:atmosphere with an oxygen volume concentration of approximately 20,95 % in a control volume andunrestricted air flow into the same control volume
3.2.reduced oxygen atmosphere:atmosphere with either one of the following conditions that differ from ambient atmospheres:
a) vitiated atmosphere: atmosphere with less oxygen molecules than in ambient air in the same volume at same temperature and pressure levels (oxygen concentration below 20,95 %; vitiatedconditions), with the remaining molecules balanced by inert gas molecules.
b) under ventilated atmosphere: atmosphere with a limited air supply that leads to fewer oxygen molecules per time supplied to a combustion reaction than needed to allow stoichiometric reactionsto take place (under-ventilated conditions).ISO/TS 5660 pdf download.