JIS K 7242-2:2015

Introduction1 Scope2 Normative references3 Terms and definitions4 Principles of the test5 Suitability of a material for testing 5.1 Material geometry 5.2 Physical characteristics6 Specimen construction and preparation 6.1 Number of specimens 6.2 Size of specimens 6.3 Specimen preparation 6.4 Wrapping of specimens 6.5 Conditioning7 Apparatus and ancillary equipment 7.1 General 7.2 Test chamber 7.3 Specimen support and heating arrangements 7.4 Gas supply 7.5 Photometric system 7.6 Chamber leakage 7.7 Cleaning materials 7.8 Ancillary equipment8 Test environment9 Setting-up and calibration procedures 9.1 General 9.2 Alignment of photometric system 9.3 Selection of compensating filter(s) 9.4 Linearity check 9.5 Calibration of range-extension filter 9.6 Chamber leakage rate test 9.7 Burner calibration 9.8 Radiator cone calibration 9.9 Cleaning 9.10 Frequency of checking and calibration procedure10 Test procedure 10.1 General 10.2 Preparation of test chamber 10.3 Tests with pilot frame 10.4 Preparation of photometric system 10.5 Loading the specimen 10.6 Recording of light transmission 10.7 Observations 10.8 Termination of test 10.9 Testing of different modes11 Expression of results 11.1 Specific optical density D[S] 11.2 Clear-beam correction factor D[c]12 Precision13 Test reportAnnex A (normative) - Calibration of heat flux meterAnnex B (informative) - Variability in the specific optical density of smoke measured in the single-chamber testAnnex C (informative) - Determination of mass optical densityAnnex D (informative) - Precision data from tests on intumescent materialsBibliography

Defines a procedure for the measurement of smoke production from the exposed surface of specimens of essentially flat materials, composites or assemblies not exceeding 25 mm in thickness when placed in a horizontal orientation and subjected to specified levels of thermal irradiance in a closed cabinet with or without the application of a pilot flame.

2015 [21/12/2015]2008(R2013) [21/10/2013]2008(R2012) [22/10/2012]2008 [20/09/2008]1998 [20/11/1998]