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NFPA 270 2023

NFPA 270 2023

$80.71

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

Published By Publication Date Number of Pages
NFPA 2023 38
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Help make lives and property safer and stay compliant by using the latest testing criteria for evaluating the extent of smoke obscuration of specimens. NFPA® 270, Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber, is an essential resource for fire test labs and manufacturers. The updated 2023 edition offers the most current methods of measuring the optical density of smoke resulting from exposing flat materials, products, or assemblies up to 25 mm thick to specified levels of thermal irradiance in a single closed chamber. Changes to the standard include: Revisions to improve consistency with ASTM E1995, Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber, With the Test Specimen Oriented Horizontally Updates to referenced standards to reflect the latest knowledge

PDF Catalog

PDF Pages PDF Title
8 Chapter 1 Administration
1.1 Scope.
1.2 Purpose. (Reserved)
1.3 Application.
9 1.4 Units and Formulas.
Chapter 2 Referenced Publications
2.1 General.
2.2 NFPA Publications. (Reserved)
2.3 Other Publications.
10 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.
11 4.3 Sample Support and Heating Arrangements.
13 4.4 Gas Supply.
14 4.5 Photometric System.
15 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.
16 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.
17 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).
18 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.
19 7.9 Cleaning.
7.10 Frequency of Checking and Calibrating Procedures.
20 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.
21 9.7 Termination of Test.
9.8 Specimen Mass.
9.9 Repeat Tests.
Chapter 10 Calculations
10.1 Specific Optical Density,
Ds.
22 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
25 Annex B Precision and Bias
28 Annex C Interlaboratory Application
29 Annex D Determination of Mass Optical Density
34 Annex E Informational References

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NFPA 270 2023
$80.71