Standard Specification for Retained Sewn Seam Strength After Exposures to Hot Air and Open Flame

Importancia y uso:

4.1 It is possible that the user of FR protective clothing will experience repeated exposures to hot air as part of the work environment. While these individual exposures are not likely to pose a catastrophic threat, the cumulative effect of these exposures are likely to reduce the level of retained sewn seam strength performance to a value that is measurably lower than the sewn seam strength performance requirement established for a new item.

4.2 The assembly of textile structures requires that the seam engineering used to manufacture the product anticipate how to retain the maximum sewn seam strength during the anticipated life cycle of the product.

4.2.1 Initial sewn seam strength performance requirements of FR textile products measures sewn seam strength of a new (never exposed to heat environment) product.

4.2.2 Retained sewn seam strength (RSS₅₀) can be used to measure seam failure of FR protective clothing after repeated short duration exposures to high heat. RSS₅₀ can also be used to measure seam failure of FR protective clothing when exposed to open flame after repeated short duration exposures to high heat.

4.3 These data about retained sewn seam strength are useful to establish criteria to determine when to repair, retire, or replace FR protective clothing.

Subcomité:

D13.52

Referida por:

F2894-21

Volúmen:

07.02

Número ICS:

59.080.30 (Textile fabrics)