BS ISO 12992:2017 pdf download

BS ISO 12992:2017 pdf download.Plastics — Vertical flame spread determination for film and sheet
1 Scope
This document specifies a test method for measurement of flame spread properties of vertically oriented specimens of plastics in the form of film and sheet, 3 mm or less thickness, subjected to a small igniting flame.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 11925-2, Reaction to fire tests — Ignitability of products subjected to direct impingement of flame —Part 2: Single-flame source test
ISO 13943, Fire safety —Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13943 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1 afterglow
persistence of glowing combustion after both removal of the ignition source and the cessation of any flaming combustion
[SOURCE: ISO 13943:2008, definition 4.8]
3.2 flame-spread time
time taken by a flame front on a burning material to travel a specified distance on the surface, or to cover a specified surface area under specified conditions
[SOURCE: ISO 13943:2008, definition 4.144]
3.3 flaming droplet
molten material separating from a burning item and continuing to flame during a fire or fire test
[SOURCE: ISO 13943:2008, definition 4.150]
3.4 seat of flame
flame location at the leading edge of the affected area
Note 1 to entry: See Figure 1.
6 Apparatus
6.1 Laboratory fume hood
The laboratory fume hood shall have an inside volume of at least 0,5 m 3 . The chamber shall permit observation of tests in progress and shall be draught free while allowing normal thermal circulation of air past the test specimen during burning. The inside surfaces of the chamber shall be of a dark colour. When a light meter, facing towards the rear of the chamber, is positioned in place of the test specimen, the recorded light level shall be less than 20 lx. For safety and convenience, this enclosure (which can be completely closed) shall be fitted with an extraction device, such as an exhaust fan, to remove products of combustion that may be toxic. The extraction device shall be turned off during the test and turned on again immediately after the test to remove the fire effluents. A positive closing damper may be needed. NOTE The amount of oxygen available to support combustion is naturally important for the conduct of these flame tests. For tests conducted by this method when burning times are protracted, chamber sizes greater than 0,5 m 3 can be needed to provide reproducible results.