Developed by the British Standards Institute (BSI), the BS 4790 standard provides a test method for determining the effects of a small ignition source on textile floor coverings using a hot metal nut.
This test method is applicable to all types of textile floor coverings, loosely laid or fully bonded, used with or without underlayment.
During tests, the test specimen is mounted in one of three ways, depending on whether the textile floor covering is loosely laid, fully glued, or loosely laid with a plinth. At least three test specimens, each measuring 300 mm * 300 mm, are used in the tests.
In the hot metal nut method, the stainless steel nut is heated to 900 degrees in a muffle furnace. The sample is placed inside the test chamber and clamping equipment is placed over the sample using the supplied crucible tongs. The heated nut is placed in the middle of the clamping hardware. After 30 seconds the nut is removed and the effects of the ignition are allowed to abate. Measurements are made to evaluate the spread of ignition over the sample.
Fire tests play an important role in the classification of carpets, rugs and similar floor coverings. Hot metal nut tests are generally applied in the USA and European Union countries to determine their flammability properties.
In accordance with the legal regulations on building materials, manufacturers are obliged to have floor coverings tested for reaction to fire, which is carried out in accordance with the methods in the relevant standards. In this context, tests in accordance with the BS 4790 standard are also carried out for textile upholstery products, especially for rugs, in order to determine the effects of a small ignition source (hot metal nut).
The test method presented in the BS 4790 standard applies to a variety of applications, including carpets, rugs and mats, carpet for use on stairs, both indoors and in contract establishments.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization provides test services to determine the effects of a small ignition source on textile floor coverings by using a hot metal nut within the scope of BS 4790 standard, with its trained and expert staff and advanced technological equipment. also gives.
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