Flame retardant overalls performance test methods

Existing national laboratory test method number of small data obtained flame has great limitations , can only be used under certain conditions, relatively uniform fiber materials flame retardant properties relative , but not to evaluate the material 's fire behavior. Small laboratory test methods exist any strong limitations own big insurmountable disadvantage , in some special occasions by the small-scale test method can not obtain the required data, the direct use of standard large-scale tests, such as corner tests. Some developed countries are flame retardant technology to build a simulation of large-scale fire test method , or create some special mathematical and physical model test results extrapolated from small flame retardant overalls material burning in the fire behavior , but this is costly, not all countries can achieve, so gradually adopting some of the larger test method or combination of several test method used to evaluate flame retardant properties of materials is necessary .

flame retardant coveralls performance test methods : combustion experiment

By combustion experiment, the sample was measured mainly used carbonized area , damage length , continued burning and smoldering time . Certain size sample box with the prescribed burning prescribed fire ignited 12s, measured after removal of the source of fire retardant overalls sample continued burning and smoldering time . Smoldering stopped, measured according to the method specified in damage length . According to the relative position of the sample and the flame can be divided into vertical method , tilt method and level of law .

Vertical method is currently the most common method. Such experiments than 45 ° , horizontally burning more intense . Vertical combustion test was divided vertically damage length method, vertical flame spread performance measurement method, the sample perpendicular to the Determination of ease of ignition and combustion properties of the surface assay . GB/T5456-1997 provides Textiles - Burning behavior Flame spread properties of vertically oriented specimens determination under the Act with the requirements arising from the igniter ignition flame , ignition timing required for ignition of the sample perpendicular to the flame retardant overalls , Flame spread to the mark on the sample line ( specified distance ) the elapsed time ( in seconds ) . Can be observed simultaneously measured and recorded samples and other relevant flame spread performance. GB8746-88 provides the combustion properties of textile fabrics ease of ignition of the specimen perpendicular to the measurement , the method generates a predetermined requirements igniter flame retardant clothing for ignition of the sample perpendicular to the measured ignition flame time needed clothes . GB8745-88 provides the combustion properties of textile fabric surface measured at specified test conditions, ignited near term portion supported on the vertical panel fluff dry specimen surface , measuring flame spread down to the surface of the fabric tag line of the time .