NFPA 270: Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source i

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2013 NFPA 270
Prior Years Prior Editions of NFPA 270

Evaluate the extent of smoke obscuration with the up-to-date testing criteria in the 2013 NFPA 270.

NFPA 270: Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber provides fire test labs and manufacturers with a means of measuring smoke obscuration of essentially flat materials, products, or assemblies (including surface finishes) up to 25mm thick, when exposed to specified levels of thermal irradiance in a single closed chamber. This test method is based on ISO 5659-2, Determination of Specific Optical Density by a Single-Chamber Test, and provides equivalent results to ISO 5659-2.

The principal fire-test-response characteristic obtained from using NFPA 270 is the specific optical density of smoke from the specimens tested. An optional fire-test-response characteristic measurable with this method is the mass optical density, which is the specific optical density of smoke divided by the mass lost by the specimens during the test.

The 2013 NFPA 270 includes updated code and standard references as well as editorial revisions that improve usability and consistency with other standards. (Softbound, 29 pp., 2013)

NFPA® 270 Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber 2013 Edition

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
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
6.2 Sample Face
6.3 Number of Specimens
6.4 Additional Specimens
6.5 Size of Specimens
6.6 Specimen Preparation
6.7 Wrapping of Specimens
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