Standard Name:

BS 4790：Method for determination of the effects of a small source of ignition on textile floor coverings (hot metal nut method)

Scope of application:

This British Standard describes a method for the determination of the effects of a samll source of ignition on textile floor coverings using a hot metal nut.It is applicable to all types of textile floor coverings whether loose-laid or fully adhered and used with or without an underlay.

Sample Requirements:

From each sample,cut at lease three test specimens each measuring 300mm×300mm,including any backing or underlay that dorms part of the final installation,following the procedure described in BS 4664.

Test process:

l Test within 2 minutes of removing the specimen in the standard temperature environment of the test textile or in the atmosphere.

l Heat the nut to a temperature of 900±20℃in the muffle furnace.

l Using the crucible tongs place the heated nut onto the specimen within 3s of its removal from the furnace.

l Open the sliding panel and remove the nut from the specimen after it has been in contact with the specimen for 30±2s,and then immediately close the sliding panel once more.

Other relevant standards:

NFPA 701: Standard for Test Methods for Flame Propagation of Fabrics and Films

16 CFR 1630: Standard Test for Burning Surfaces of Carpets and Mats

16 CFR 1631: Standard Test for Flammability of Carpet and Cushion Surfaces

ISO 12952-1: Textiles - Bedding Burning Assessment - Part 1: Ignition Source: Smoldering cigarettes

ISO 12952-2: Textiles – Items for the assessment of the flammability of bedding – Part 2: Ignition source: Simulated matches

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