BS ISO 29903‑1:2020 Comparison of toxic gas data from different tests Part 1: Guidance and requirements

BS ISO 29903‑1:2020 Comparison of toxic gas data from different tests Part 1: Guidance and requirements. 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 5725-1. ISO 13943. and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 3.1 small-scale fire test bench-scale test fire test performed on a test specimen of small dimensions Note 1 to entry: In these tests, the typical maximum length of a linear test specimen is less than 1 m. The typical maximum dimensions of a rectangular specimen are approximately 0,1 m. [SOURCE: ISO 13943:2017, definition 3.346, modified — Note 1 to entry has been redrafted and the term “bench-scale test” has been added as a preferred term because of its use in this document.] 3.2 medium-scale fire test fire test performed on a test specimen of small-medium size dimensions Note ito entry: A fire test performed on a test specimen of which the maximum dimension is between 0,5 m and 1,0 m is here called a medium-scale fire test. 3.3 intermediate-scale fire test fire test performed on a test specimen of medium dimensions Note 1 to entry: A fire test performed on a test specimen for which the maximum dimension is between 1 m and 3 m is usually called an intermediate-scale fire test. [SOURCE: ISO 13943:2017, definition 3.233, modified — Notes 2 and 3 to entry have been removed] 3.4 large-scale fire test fire test, that cannot be carried out in a typical laboratory chamber, performed on a test specimen of large dimensions Note ito entry: A fire test performed on a test specimen of which the maximum dimension is greater than 3 m Is usually called a large-scale fire test. [SOURCE: ISO 13943:2017, definition 3.239] 4 Combustion conditions 4.1 General The yields and nature of the fire effluent component from a fire test of any scale are determined by the involved fuels and the prevalent thermal and oxidative conditions in the current stage of the fire. These conditions also determine the burning rate of the products/materials and thus the rate of effluent generation. See ISO 16312-1. During a fire test of a finished product, the combustion conditions are likely to change. These changes include the chemistry of the combustible item and the...