NFPA 270 : 2018

Chapter 1 Administration 1.1 Scope. 1.2 Purpose. (Reserved) 1.3 Application. 1.4 Units and Formulas. Chapter 2 Referenced Publications 2.1 General. 2.2 NFPA Publications. (Reserved) 2.3 Other Publications. 2.4 References for Extracts in Mandatory Sections. (Reserved) Chapter 3 Definitions 3.1 General. 3.2 NFPA Official Definitions. 3.3 General Definitions. Chapter 4 Test Apparatus 4.1 General. 4.2 Test Chamber. 4.3 Sample Support and Heating Arrangements. 4.4 Gas Supply. 4.5 Photometric System. 4.6 Chamber Leakage. 4.7 Cleaning Materials. 4.8 Ancillary Equipment. Chapter 5 Test Environment 5.1 Light Interference. 5.2 Product of Combustion Venting. 5.3 Operator Safety. Chapter 6 Test Specimen 6.1 Suitability of Sample for Testing. Chapter 7 Setup, Calibration, and Maintenance 7.1 Setup and Calibration Procedures. 7.2 Alignment of Photometric System. 7.3 Selection of Compensating Filter(s). 7.4 Linearity Check. 7.5 Calibration of Range-Extension Filter. 7.6 Chamber Leakage Rate Test. 7.7 Burner Calibration. 7.8 Radiator Cone Calibration. 7.9 Cleaning. 7.10 Frequency of Checking and Calibrating Procedures. 7.11 Total System. Chapter 8 Conditioning 8.1 Pre-Test. 8.2 Conditioning. Chapter 9 Test Procedure 9.1 Initial Conditions. 9.2 Tests with Pilot Flame. 9.3 Preparation of Photometric System. 9.4 Loading Specimen. 9.5 Recording of Light Transmission. 9.6 Observations. 9.7 Termination of Test. 9.8 Specimen Mass. 9.9 Repeat Tests. Chapter 10 Calculations 10.1 Specific Optical Density, Ds. 10.2 Clear Beam Correction Factor, Dc. 10.3 Mass Loss. Chapter 11 Test Report 11.1 Descriptive Information. 11.2 Test Results. Annex A Explanatory Material Annex B Precision and Bias Annex C Interlaboratory Application Annex D Determination of Mass Optical Density Annex E Informational References

Gives a means of measuring smoke obscuration resulting from subjecting essentially flat materials, products, or assemblies (including surface finishes) not exceeding 25 mm in thickness to specified levels of thermal irradiance from a conical heater, in a single closed chamber, in the absence or presence of a pilot flame, and when placed in a horizontal orientation.