ISO 12127-1 specifies a test method for determining contact heat conduction. It applies to protective clothing (including hand protectors) and its constituent materials to protect against high contact temperatures.
The heating cylinder is heated to and held at the contact temperature, and a test sample is placed in the calorimeter. The heating cylinder is lowered onto the test sample supported by the calorimeter, or alternatively, the sample calorimeter is lifted onto the heating cylinder. In both cases, the process is performed at a constant speed. The threshold time is determined by monitoring the temperature of the calorimeter.
The heating cylinder must be made of a suitable metal that can withstand temperatures in excess of 500 °C. There will be a central hole ending 2mm above the bottom surface of the heating roller. This hole is designed to hold the temperature sensor necessary for regulating the temperature of the heating cylinder, and its diameter should be chosen accordingly. The heating roller will be sealed with heat resistant insulation, leaving the bottom contact surface free.
Place the test sample face up on the calorimeter. Remove the shield between the heating roller and the calorimeter and bring the heating roller into contact with the calorimeter at a contact rate (5,0 ± 0,2) mm/s. Measure and record the temperature of the calorimeter during the test. Take at least three measurements at each contact temperature.
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