BS EN ISO 12127-1:2015 pdf free.Clothing to protect against heat and flame – Determination of contact heat transmission through clothing or constituent materials -Part1:Contact heat produced by heating cylinder.
Protective clothing designed to protect against heat and flame can be exposed to direct contact with hot substances or hot surfaces.
The diversity of such contact conditions makes it difficult to evaluate the hazards that can arise from high temperature.
The test method described in this part of Iso 12127 allows this heat transfer to be assessed when a heating cylinder and the clothing material are brought into contact with each other.
This part of ISO 12127 forms part of a series of standards concerned with clothing designed to protect against heat and fire.
This part of ISO 12127 specifies a test method for the determination of contact heat transmission. It is applicable to protective clothing (including hand protectors) and its constituent materials intended to protect against high contact temperatures.
Application of this part of ISO 12127 is restricted to contact temperatures between 100 °C and 500 °C.
3 Principle
The heating cylinder is heated to and maintained at the contact temperature and a test specimen is placed on the calorimeter. The heating cylinder is lowered onto the test specimen supported by the calorimeter or, alternatively, the calorimeter with the specimen is lifted up to the heating cylinder. In either case, the operation is carried out at a constant speed. The threshold time is determined by monitoring the temperature of the calorimeter.
4.1 Heating cylinder
The heating cylinder shall be constructed from a suitable metal which can withstand temperatures of over 500°C (e.g. Silver Alloy, 925 Sterling Silver). Figures 1, 2 and 3 show an example of the stamp and heating cylinder. The contact surface shall have a diameter of (25,2 ± 0,05) mm and shall be polished. There shall be a central boring which ends 2 mm above the lower surface of the heating cylinder. This boring is intended to hold the temperature sensor, which is necessary for regulation of the temperature of the heating cylinder, and its diameter should be chosen accordingly. The heating cylinder shall be enclosed by heat-resistant insulation, leaving free the bottom contact surface.
The heating cylinder shall be capable of being heated to over 500°C and be capable of maintaining the chosen testing temperature.
4.2 Calorimeter
The calorimeter (as shown in Figure 4) consists of a cylindrical disc of black anodized pure aluminium of(25 ± 0,05) mm diameter, and thickness of approximately 5,0 mm and a mass of (6,63 ± 0,03) g, which is pushed into a mounting made from polyamide 6.6 so as to be a tight fit. The upper contact surface of the disc shall he surface ground before anodization and shall have a thermocouple attached to its lower surface by means of adhesive tape.