NFPA 270: Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber
Current Edition: 2013 Next Edition: 2018

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NFPA 270:
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What is NFPA 270?
NFPA 270: Document Scope
1.1 Scope. 1.1.1 This shall be a fire-test-response standard. 1.1.2 This test method shall provide 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. 1.1.3 The principal fire-test-response characteristic obtained from this test method shall be the specific optical density of smoke from the specimens tested, which is obtained as a function of time, for a period of 10 minutes. 1.1.4 Other fire-test-response characteristics shall also be permitted to be determined. 1.1.5 An optional fire-test-response characteristic measurable with this test method shall be the mass optical density, which is the specific optical density of smoke divided by the mass lost by the specimens during the test. 1.1.6 This test method shall be based on ISO 5659-2, Determination of Specific Optical Density by a Single-Chamber Test, and shall provide equivalent results to ISO 5659-2. 1.1.7 The fire-test-response characteristics obtained from this test shall be specific to the specimen tested, in the form and thickness tested, and shall not be inherent properties of the material, product, or assembly. 1.1.8* This test method shall not provide information on the fire performance of the test specimens under fire conditions other than those conditions specified in this test method. 1.1.9 This standard shall measure and describe the response of materials, products, or assemblies to heat and flame under controlled conditions, but shall not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions. 1.1.10* Fire testing of products and materials is inherently hazardous, and safeguards for personnel and property shall be employed in conducting these tests. 1.1.11 This standard shall not purport to address all of the safety problems, if any, associated with its use. 1.1.12 It shall be the responsibility of the user of this standard to establish the necessary safety and health practices and determine the applicability of regulatory limitations prior to use. A.1.1.8 For limitations of this test method, see 1.3.3. A.1.1.10 This test method is known to involve hazardous materials, operations, and equipment as described in 5.2.2, 5.2.3, and 9.7.2.
This test method provides 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. Official document scope
What does NFPA 270 address?
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.Table Of Contents.
NFPA 270, 2013 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.
ROP Meeting Notice
ROP Meeting Notice
Note: Please contact the appropriate staff liaison (listed on the Technical Committee tab) for information on attending an NFPA Technical Committee meeting as a guest. Read NFPA"s Regulations Governing Committee Projects (Section 3.3.3.3) for further information.
ROP Meeting Agenda
ROP Meeting Minutes
ROP Ballot
ROP Ballot
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Ballot Form (PDF, 41 KB)
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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.
ROC Meeting Notice
ROC Meeting Notice
Note: Please contact the appropriate staff liaison (listed on the Technical Committee tab) for information on attending an NFPA Technical Committee meeting as a guest. Read NFPA"s Regulations Governing Committee Projects (Section 3.3.3.3) for further information.
ROC Meeting Agenda
ROC Meeting Minutes
ROC Ballot
ROC Ballot
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Ballot (PDF, 117 KB)
Ballot Form (PDF, 34 KB)
Ballot Final (PDF, 159 KB)
Motions Committee Report (NITMAM)
Motions Committee Report (NITMAM)
Proposed NFPA documents will be presented for action at the applicable Annual (June) Association Technical Meeting only when proper Amending Motions (Notice of Intent to Make a Motion - NITMAM) have been certified by the Motions Committee of the Standards Council as a proper amending motion. Documents that receive no motions will not be presented at the meeting and instead will be forwarded directly to the NFPA Standards Council for action on issuance. More about the codes and standards making process including NITMAM.
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Association Technical Meeting
Consent document not presented at Association Technical Meeting. Document issuance by Standards Council: 11/27/2012
Archived revision information
NFPA 270, 2013 Edition: Archived Revision Information
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