Benifits of Wool Fabric
Flame resistance is the characteristic of a fabric that causes it not to burn in air. Flame resistance is often confused with flame retardant which is a term used to describe a chemical substance that imparts flame resistance on fabric. The most commonly used test method for measuring flame resistant (FR) fabrics is ASTM D6413* Standard Test Method for Flame Resistance of Textiles (Vertical Test) (formerly; Method 5903.1 of Federal Test Method Standard 191A). The test uses an enclosed cabinet in which 12-inch long specimens are suspended vertically over a controlled flame which is impinged on the bottom edge of the fabric for 12 seconds. From this exposure three responses are noted: * Char Length: The length of fabric destroyed by the flame so that it will readily tear by application of a standard weight. (Average of 5 specimens each; Warp and Fill) * Afterflame: The number of seconds during which there is a visible flame remaining on the fabric after the ignition source has been removed. * Afterglow: The number of seconds during which there is a visible glow remaining on the fabric after all flaming has ceased. (Not typically a requirement of most standards)
The vertical flame test ASTM D6413 is a test method with no pass/fail requirements. Industry established standards range from 4" to 6" (100mm to 150mm) maximum char lengths, however, a lower char length does not necessarily correlate to enhanced protection.
Although passing the vertical flammability requirements is an essential criterion for protective clothing fabrics, it is only one of a battery of tests that fully describes the protective characteristics. After a material has demonstrated that it has self-extinguishing characteristics both initially and throughout the garment service life, additional specific tests can be employed to determine the protective capabilities to exposures such as electric arc, flash fire and molten metal splash.
****The wool fabric retardant and flame retardant
The vertical flame test ASTM D6413 is a test method with no pass/fail requirements. Industry established standards range from 4" to 6" (100mm to 150mm) maximum char lengths, however, a lower char length does not necessarily correlate to enhanced protection.
Although passing the vertical flammability requirements is an essential criterion for protective clothing fabrics, it is only one of a battery of tests that fully describes the protective characteristics. After a material has demonstrated that it has self-extinguishing characteristics both initially and throughout the garment service life, additional specific tests can be employed to determine the protective capabilities to exposures such as electric arc, flash fire and molten metal splash.
****The wool fabric retardant and flame retardant
References: INTRODUCTION INTRODUCTION ****