Vertical Flame Measurement
Vertical ignition testing protocol defines the standard method for evaluating the burn behavior of textile materials. The procedure known as astm d6413 measures the resistance of a fabric to flame propagation when exposed to a controlled ignition source in a vertical orientation. Technicians hang a specimen inside a cabinet and apply a methane flame to the bottom edge for a specified duration to determine ignition time and char length.
Afterflame Duration
Assessment of this metric tracks the time a specimen continues to support a flame after the removal of the igniter. Determining the residual combustion helps establish the propensity for fire spread across a garment surface. Extended burning times signal a failure to self-extinguish.
Char Length
Evaluation of material damage quantifies the distance from the bottom edge of the fabric to the top of the hole or charred area created by the test flame. Measurement follows the application of a specified weight to the bottom of the charred section to ensure uniform tension during the reading. A shorter distance corresponds to superior thermal resistance under direct heat exposure.
Ignition Constraint
Determination of flame persistence governs the utility of protective apparel in environments involving high thermal risk. Performance limits dictate whether a treated fabric or synthetic blend meets safety requirements for occupational environments. Compliance with these protocols identifies materials suitable for use in environments where accidental exposure to heat constitutes a functional hazard.
