RESISTENTE AL FUOCO

Questi test vengono eseguiti, ad esempio, quando si testano i tessuti di rivestimento dei mobili imbottiti destinati al mercato domestico, in conformità al "The Furniture and Furnishings (Fire) (Safety) Regulations 1988".

Cover fabrics which have been treated with a fire-retardant chemical shall be subjected to a water-soaking procedure before testing.The smouldering cigarette source is an untipped cigarette with certain characteristics, such as a smouldering rate of 12 ± 3 min/50 mm. Two cigarettes are tested and a ‘pass’ is obtained if no flaming or progressive smouldering is observed.

The burning match is simulated by a butane flame with a flame height of about 35 mm. Two tests are performed. The flame is applied for 20 s. To obtain a pass, afterflame time should be < 120 s and there should be no flaming or progressive smouldering.

Il test della culla 5 può essere richiesto quando i mobili imbottiti sono utilizzati nel mercato non domestico.

I tessuti di copertura trattati con sostanze chimiche ignifughe devono essere sottoposti a una procedura di immersione in acqua prima della prova.

Vengono eseguiti due test. Per ottenere la sufficienza, il tempo di post-fiamma deve essere ≤ 10 minuti e non si deve osservare alcuna fiammata o progressiva combustione.

Questo test consiste in diversi test secondari che portano a una determinata classificazione, in genere da M1 a M4. Per ogni test vengono esaminati quattro campioni.

In the NF P 92-503 test, the specimen is placed above a radiator under a 30° angle. A small flame is applied to the specimen for 5 s; there are maximum 10 flame applications for each specimen at a specific timing during the test duration (5 min). The most important criteria in this test are the afterflame time, the occurrence of burning droplets/debris and the damaged length of the specimen.

In the NF P 92-504 test, the specimen is placed vertically. A small flame is applied 10 times during 5 s. Afterflame times > 2 s and burning droplets are the most important criteria in this test. In the NF P 92-505 test, the specimen is placed horizontally on a grid beneath a radiator. Burning droplets that ignite the cotton wool below the specimen lead to an M4-classification.