NFPA 258: Recommended Practice for Determining Smoke Generation of Solid Materials
Current Edition: 2001 Next Edition: Withdrawn

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NFPA 258:
2001 Edition
Item #: 25801
List: $42.00
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Format: PDF
This document was withdrawn at the Annual 2006 meeting. Material found in ASTM E 662.
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What is NFPA 258?
NFPA 258: Document Scope
1.1.1* This test method provides a procedure for assessing the smoke obscuration caused by the burning of solid materials and assemblies in thicknesses up to and including 1 in. (25.4 mm) where subjected to specific test conditions in a closed chamber. The test is used as a research and development tool only and should not be used as a basis for determining ratings for building codes or other regulatory purposes. 1.1.2 Measurement is made of the attenuation of a light beam by the suspended solid or liquid particles - that is, smoke - that accumulate within a closed chamber. The smoke is due to either nonflaming, pyrolytic decomposition or flaming combustion of a relatively small sample of material. The radiant heat source is an electric furnace. NFPA 270, Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber, has subsequently been developed using an improved-design radiant heat source within the same closed chamber. 1.1.3* Test results are expressed in terms of specific optical density, which is a dimensionless property derived from the measured light transmission and geometric easurements of the chamber and the specimen. 1.1.4 This test is intended to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled conditions. It is not intended to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions.
Official document scope
What does NFPA 258 address?
Table Of Contents.
NFPA 258, 2001 Edition: Archived Revision Information
Report on Proposals (ROP)
Report on Proposals (ROP)
Proposals can be submitted for text to be amended or included in NFPA Codes and Standards. Following the Call for Proposals period, the responsible Technical Committee or Panel holds a meeting to consider and act on all submitted proposals. The committee or panel may also develop its own proposals. A document known as the Report on Proposals (ROP) is prepared containing all the Public Proposals, Technical Committees' action on each Proposal, as well as all Committee-generated proposals. The ROP for the document in question is submitted for the approval of the responsible TC or Panel by a formal written ballot. If the ROP does not receive approval via written ballot in accordance with NFPA rules, the Report is returned to the committee for further consideration and is not published. If the necessary approval is received, the ROP is published in a compilation of Reports on Proposals issued by NFPA twice yearly for public review and comment, and the process continues to the next step. The ROP is published and widely distributed and anyone may download or request a copy.
Report on Comments (ROC)
Report on Comments (ROC)
Once the ROP becomes available, there is a 60-day comment period during which time anyone may submit a public comment on the proposed changes documented in the ROP. The committee or panel reconvenes at the end of the comment period and acts on all public comments. This committee or panel may also develop its own comments. As before, approval obtained via written ballot in accordance with NFPA's Regulations is required on all committee and panel actions. All of this information is compiled into a second Report, called the Report on Comments (ROC), which like the ROP, is published and made available for public review for a seven-week period.
Archived revision information
NFPA 258, 2001 Edition: Archived Revision Information
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