BS ISO 13344 pdf free download
BS ISO 13344 2015 pdf free download.Estimation of the lethal toxic potency of fire effluents.
This International Standard provides a means for estimating the lethal toxic potency of the fire effluent produced from a material while exposed to the specific combustion conditions of a physical fire model. The lethal toxic potency values are specifically related to the fire model selected, the exposure scenario and the material evaluated. Lethal toxic potency values associated with 30-min exposures of rats are predicted using calculations which employ combustion atmosphere analytical data for carbon monoxide (CO), carbon dioxide (CO 2 ), oxygen (O 2 ) (vitiation) and, if present, hydrogen cyanide (HCN), hydrogen chloride (HCl), hydrogen bromide (HBr), hydrogen fluoride (HF), sulfur dioxide (SO 2 ), nitrogen dioxide (NO 2 ), acrolein and formaldehyde. The chemical composition of the test specimen may suggest additional combustion products to be quantified and included. If the fire effluent toxic potency cannot be attributed to the toxicants analysed (Annex A), this is an indication that other toxicants or factors must be considered. This International Standard is applicable to the estimation of the lethal toxic potency of fire effluent atmospheres produced from materials, products or assemblies under controlled laboratory conditions and should not be used in isolation to describe or appraise the toxic hazard or risk of materials, products or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire hazard assessment that takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use; see ISO 19706. The intended use of fire safety-engineering calculations is for life-safety prediction for people and is most frequently for time intervals somewhat shorter than 30 min. This extrapolation across species and exposure intervals is outside the scope of this International Standard. This International Standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this International Standard to establish appropriate safety and health practices.
2 Normative references The following referenced documents are indispensable for the application 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 13571, Life-threatening components of fire — Guidelines for the estimation of time to compromised tenability in fires
ISO 13943:2008, Fire safety — Vocabulary
ISO 19701, Methods for sampling and analysis of fire effluents
ISO 19702, Guidance for sampling and analysis of toxic gases and vapours in fire effluents using Fourier transform infrared (FTIR) spectroscopy
ISO 19706, Guidelines for assessing the fire threat to people
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13943:2008 apply.
4 Principle 4.1 This method subjects a test sample to the combustion conditions of a specific physical fire model. Concentrations of the major gaseous toxicants in the fire effluent atmosphere are monitored over a 30- min period, with (C⋅t) products for each interval being determined from integration of the areas under the respective concentration vs time plots. The (C⋅t) product data, along with either the mass charge or the mass loss of the test sample during the test, are then used in calculations to predict the 30-min LC 50 of the test sample. 4.2 Since there can be toxicants present other than those measured, this value of the LC 50 is a maximum. If the chemical formulation and professional experience suggest that additional toxicants might contribute significantly to the LC 50 value, the accuracy of the predicted LC 50 may then be experimentally determined using a bioassay (see Annex A). Agreement within the experimental uncertainty supports attributing the lethality of the smoke to the monitored toxicants.BS ISO 13344 pdf download.
