Certification and Registration
ISO 9151 Determination of Heat Transfer Through Thermal and Fire‑Resistant Protective Clothing Exposed to Flame
Category:
Protective Clothing
ISO 9151 Standard Description
ISO 9151 Protective clothing against heat and flame - Determination of heat transmission on exposure to flame
ISO 9151 Standard Introduction
In industrial production and fire safety, high-temperature environments—such as molten steel in metallurgical workshops, heated molds in foundries, and sparks generated during welding—continuously challenge worker safety.Evaluating whether protective clothing, such as firefighter protective suits, can effectively block flame and heat exposure and provide reliable protection has become a key aspect in assessing protective equipment performance.
ISO 9151 specifies a test method for evaluating the heat transfer performance of protective clothing materials and their multilayer assemblies.The heat transfer index of the material is used as an indicator of its relative heat resistance under specified test conditions.The application of ISO 9151 helps designers and manufacturers of protective clothing select appropriate material combinations, improve thermal protection performance in high-temperature workplaces, metallurgical processes, firefighting operations, and other high-heat environments, thereby enhancing worker safety.
ISO 9151 Scope of Application
ISO 9151 is applicable to protective clothing materials and material assemblies, including flame-resistant clothing, thermal protective clothing, and other textile materials designed for protection against high-temperature environments.
ISO 9151 Test Method
The specimen is placed horizontally and secured, with the underside exposed to a gas flame with a heat flux of (80 ± 2) kW/m².The heat transferred through the specimen is measured using a copper calorimeter placed above and in contact with the specimen. The temperature increase of the calorimeter is recorded until it reaches (24 ± 0.2)°C.The time required to achieve this temperature rise is recorded in seconds, and the average value obtained from three specimens is defined as the Heat Transfer Index (Flame).
(1) Test Preparation
Adjust the specimen holder so that the upper surface is positioned at a distance of (50 ± 2) mm from the burner.Ignite and stabilize the gas flame for at least 3 minutes before testing. Connect the thermocouple to the recording device and ensure that the copper plate temperature remains stable within ±2°C of the ambient temperature.Adjust the gas flow rate and burner position to achieve a heat flux of (80 ± 2) kW/m². The heat flux curve shall meet the required linearity criteria.
(2) Specimen Installation
Place the specimen on the support with the outer surface facing downward. If the specimen consists of multiple layers, the layers shall be arranged according to their actual configuration.Position the locating plate and install the copper calorimeter into the opening of the plate, ensuring that the copper disc is in close contact with the upper surface of the specimen.
(3) Specimen Exposure and Temperature Rise Recording
Quickly move the burner beneath the specimen or open the protective shutter, and start recording simultaneously.Continue exposure until the calorimeter temperature increases by at least 24°C, then remove the burner or close the shutter.Record the time required for the temperature to rise by 24°C and observe any changes occurring on the specimen surface during testing, such as shrinkage, carbonization, melting, or other visible effects.
(4) Cleaning and Repeated Testing
Remove the calorimeter and clean any deposits from its surface. If necessary, reapply the black coating.Repeat the same procedure for the remaining two specimens. The average value of the three test results is calculated, and the average time required for a 24°C temperature rise is reported as the Heat Transfer Index (Flame).
SATISFY provides one-stop protective clothing testing services, including preliminary assessment, preparation and submission of technical documentation, complete test monitoring, report interpretation, data analysis, and corrective action recommendations.For more information about our testing services, please contact SATISFY customer service.
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SATISFY TECH AND SERVICE LLC delivers full-lifecycle technical solutions for children’s products, hygiene care, protective equipment, furniture, and building materials. Our framework spans compliance pre-assessment, standard upgrading, and risk control. We empower manufacturers and exporters through expert testing, certification, consulting, and standards interpretation.
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