Durability of Firefighters' Protective Clothing to Heat and Light

Abstract

Fabrics used in firefighters' protective clothing were exposed to simulated sunlight from a xenon are Weather-Ometer and heat in a forced air circulating oven, and the resulting changes in properties were measured (color, tearing strength, flame resistance and thermal protective performance). The thermal shrinkage and weight loss associated with heat exposure were also noted. Outer shell fabrics of Nomex III, Zirpro flame resistant wool, and PBI/Kevlar were all susceptible to light and underwent marked reductions in tensile tearing strength as a result of light exposure. Heat exposure resulted in a significant reduction in the tearing strength of all outer shell fabrics while increasing the tearing strength of moisture barrier fabrics. A polyamid/flame resistant viscose blend was extremely sensitive to heat exposure, undergoing a substantial loss in tearing strength and appreciable thermal shrinkage. Zirpro flame resistant wool was particularly sensitive to temperatures greater than 230°C. Although both light and heat caused losses in physical strength, there was no noticeable reduction in the flame resistance or thermal protective performance of the individual fabrics and garment assemblies studied.