Sheet structure for combination flash flame and chemical...

A - Human Necessities – 62 – D

Patent

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A62D 5/00 (2006.01) A41D 31/00 (2006.01)

Patent

CA 2561418

This invention is related to a flexible sheet structure (1) useful in garments for providing combination flash flame and chemical splash protection, and a garment comprising such flexible sheet structure, the flexible sheet structure comprising a fabric layer (2) comprising flame retardant fibers, a chemical barrier layer (3) being able to provide greater than 60 minute chemical permeation pursuant to ASTM F739 for at least 11 of the 21 chemicals listed in this test procedure, and a continuous outer polymer layer (4); the flexible sheet structure having a thermal shrinkage resistance of less than 10 percent when tested according to NFPA 2112, and having an after flame performance of less than 2 seconds and a char length of not more than 4 inches (100 mm) when tested per ASTM D6413.

La présente invention concerne une structure (1) de feuille souple utile dans des vêtements assurant une protection mixte contre les flammes et les projections chimiques, ainsi qu'un vêtement comprenant une telle structure de feuille souple, ladite structure de feuille souple comprenant une couche de tissu (2) formée de fibres à réaction limitée au feu, une couche (3) barrière chimique capable d'assurer une perméance aux produits chimiques pendant plus de 60 minutes suite au test ASTM F739 pour au moins 11 des 21 produits chimiques répertoriés dans cette procédure de test et une couche (4) polymère externe continue. La structure de feuille souple présente une résistance au retrait thermique inférieure à 10 pour-cent lors du test NFPA 2112 et une efficacité de flamme persistante de moins de 2 secondes ainsi qu'une longueur de surface carbonisée ne dépassant pas 4 pouces (100 mm) lors du test ASTM D6413.

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