The permeability and fire protective clothing

1. The concept of the permeability

The permeability is in unit time per unit area through clothing to describe the quality of the layer of water vapor. Fire protective clothing, for example, the speed of water vapor molecules penetrate clothing layer depends on the firefighters skin and water vapor concentration between fire fighter clothing outside air (or humidity), but also influenced by fabric physical resistance. Fireman moisture difference depends on exercise intensity (intensity, the greater the is, the more of the sweat) and climate environment. Fabrics resistance is a kind of performance of the material and its thickness used. In general, the thicker the fire protective clothing, the stronger the thermal protective performance, and clothing permeability is worse.

2. The structure and permeability of fire protective clothing

Fire protective clothing is by the outer layer, waterproof breathable layer, insulating layer, comfortable multilayer composite fabric. Among them: the outer fabric has high flame retardant and thermal properties, defense flame and high temperature; Waterproof breathable layer between the outer layer and insulating layer, can rise to prevent water to permeate insulating layer and the effect of discharge water vapor; Insulating layer with high temperature resistant heat insulation effect, make the firefighters from high temperature and radiant heat; Comfortable layer main effect is to make the firefighters wearing more comfortable. Multilayer structure to make fire protective clothing has good flame retardant, heat insulation, radiant heat penetration resistance and other properties, but at the same time permeability decrease fire protective clothing, and with the increase of the weight of the fire protective clothing, make more biological heat generated in the firefighters. The excess heat makes the body's temperature to rise, to the health of the firefighters.