BS 4790: Method for Determination of the Effects of a Small Ignition Source on Textile Floor Coverings (Hot Metal Nut)

Standard Name:

4790: Test method for determining the effect of a small ignition source on textile floor coverings (hot metal nut)

Scope:

Standard 4790 describes a method for determining the effect of a small ignition source, using a hot metal nut, on textile floor coverings. It applies to all types of textile floor coverings, whether loosely laid or fully adhered, with or without underlay.

Sample Requirements:

According to the standard, at least 3 specimens, sized 300mm ✖ 300mm, including any backing or underlay that forms part of the final installation, must be cut.

Test Procedure:

Test the specimen within 2 minutes of removal from the standard textile conditioning atmosphere or environment

Heat the nut to a temperature of 900±20°C in a muffle furnace

Place the heated nut on the surface of the specimen, ensuring it is centered within the clamping ring.

After the sliding panel has been in contact with the specimen for 30±2 seconds. Remove the nut, keeping it closed until all ignition effects have ceased.

Other Related Standards:

NFPA 701: Standard Methods of Fire Tests for Flame Propagation of Textiles and Films

16 CFR 1630: Standard Test for Surface Burning of Carpets and Rugs

16 CFR 1631: Standard Test for Surface Flammability of Carpets and Rugs

ISO 12952-1: Textiles — Assessment of the burning behaviour of bedding items — Part 1: Ignition source: smouldering cigarette

ISO 12952-2: Textiles — Assessment of the burning behaviour of bedding items — Part 2: Ignition source: simulated match flame

ISO 6941: Textile fabrics — Burning behaviour — Measurement of flame spread properties of vertically oriented specimens

EN 13772: Textiles and textile products — Burning behaviour — Curtains and drapes — Measurement of flame spread of vertically oriented specimens