BS ISO 9772:2020 pdf free

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BS ISO 9772:2020 pdf free.Cellular plastics – Determination of horizontal burning characteristics of small specimens subjected to a small flame.
BS ISO 9772  This document specifies a small-scale laboratory screening procedure for comparing the relative burning characteristics of horizontally oriented, small cellular plastic specimens having a density less than 250 kg m-3 determined in accordance with ISO 845, when exposed to a small-flame ignition source.Another International Standard which covers flexible cellular plastic and cllular rubber is ISO 3582[2]. This method of test is intended for quality assurance and limited product evaluation of cellular plastic materials under controlled laboratory conditions, and is not intended to assess the fire behaviour of, for example, building materials or furnishings under actual fire conditions.The optional classification system described in Annex A is intended for the pre- selection of cellular plastic materials for products, including the determination of the ranges of material parameters that give the same classification (see 6.1). A laboratory fume hood, having an inside volume of at least 0,5 m3 is used. The chamber shall permit observation of tests in progress and shall provide a draught-free environment whilst 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 lux.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 might 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 might be needed. 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 m3 might be needed to provide reproducible results.BS ISO 9772 pdf download.

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