TPP thermal protection performance test analysis

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Fabric Thermal Protection TPP

The thermal protection performance TPP value of the fabric is the thermal protection ability of the fabric against the combined effects of thermal radiation and thermal convection. It can directly reflect the thermal protection ability of the fabric. Such thermal protection properties.

This test method is to place the sample horizontally on a specific heat source. Within a specified distance, the heat source transmits heat in two different forms (heat Convection and thermal radiation) appear, the copper sheet heat flow meter placed on the other side of the sample can measure the temperature on the back of the sample, use the copper sheet heat flow meter behind the sample to measure its temperature rise curve, and compare it with the Stoll standard curve to obtain the second level The time required for burn t2 is multiplied by the exposure heat flow q to obtain the TPP value, which is calculated as: TPP= t2 ×q. In the formula, t2 is the time required to cause second-degree burns (s); q is the convective radiation heat flow set by the protective performance TPP value system, in kW/m.

The larger the TPP value, the better the thermal protection performance of the fabric, that is, the thermal insulation performance; on the contrary, the worse the thermal insulation performance. This method links the thermal protection of the material with the human body’s feelings, and can more objectively predict the actual effect of clothing in application. It has now been listed as a universal testing method.

The TPP value of the thermal protection performance of the fabric has a significant impact on the thickness, surface density and air permeability indicators of the fabric: the thicker the fabric, the more fibers it contains. The more heat penetrates the fabric, the longer it takes for Grade II burns; there is an obvious negative correlation between the fabric’s air permeability and the thermal protection performance TPP value, that is, the better the fabric’s air permeability, the looser the fabric, the easier it is to direct radiant heat through the fabric. There is no obvious correlation between the density of the fabric and the thermal protection properties of the fabric.

In the performance research of thermal protective clothing, it is necessary to pay attention to the comprehensive performance requirements of thermal protective clothing, that is, the thermal protective clothing also has good thermal protection performance , wearing performance and wearing comfort performance, and the performance requirements of various types of thermal protective clothing should be emphasized according to the different uses of various types of thermal protective clothing. The requirements for certain performance aspects of thermal protective clothing should be increased or enhanced according to different use environments, so that The performance requirements of thermal protective clothing are becoming more comprehensive and reasonable.

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