Calibration Certificate: Issued by Shanghai Textile Group Testing Standards Co., Ltd., Shanghai Branch of the National Textile Metrology Station, ZZ-2025091296 [Scope of Application]: The heat delivered to the skin through clothing materials via a heat source primarily occurs through three mechanisms—radiative heat, convective heat, and thermal conduction—or a combination thereof. Convective heat refers to heat transferred through the flow of liquids or gases, with its measurement result expressed as the Heat Protection Index (HTI). [Test Method]: By applying convective thermal shock from a flame to the bottom of the sample, measure the time required for the temperature at the back of the sample to rise by 12°C or 24°C. The average value of three tests is recorded as the Thermal Protection Index (HTI), which evaluates the thermal protection performance of protective clothing fabrics. [Related Standards]: BS EN 367:1992 Protective clothing. Heat resistance and fire resistance. Metho
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