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UNE-EN ISO 6942:2022
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UNE-EN ISO 12947-2:2016

UNE-EN ISO 9151:2018

PROTECTIVE CLOTHING AGAINST HEAT AND FLAME. DETERMINATION OF HEAT TRANSMISSION ON EXPOSURE TO A FLAME

OBJECT

This standard describes a method to determine the transmission of heat through materials or a combination of materials used in the protective layer.

This standard describes a method to determine the transmission of heat through materials or a combination of materials used in the protective layer. Los materials se clasifican mediante el cálculo de un índice de transferencia del calor, que proporciona una indication de la protection relativa bajo la conditions específicas de ensayo. El índice de transferencia térmica no debe ser tomado as a medida del tiempo de protection ofrecido por el material tried in real conditions of use.

DEFINITIONS

  • Test sample: Consists of all the capas of such and other materials, discussions in the order and orientation that is used in the practice, including the interior ropa cuando proceda. The muestra must have dimensions of 140 mm + 140 mm, y debe ser tomada a más de 50 mm, del borde de las piezas de material y en zones sans defectos.
  • Density of incident calorifico flujo, Q
  • Índice de transferencia de calori, HTI: (llama) tiempo medio, tm redondeado al segundo, necessary to obtain a temperature increment of (24 ± 0.2) °C cuando se saya por este método, usando un disco de cobre de mass (18 ± 0.05) g and an incident heat flujo of (80 ± 2) kW/m2, coming from a 95% propane gas burner.

ESSAY

  • Conditioning samples: 24h 20ºC 65% HR
  • Test atmosphere: 23ºC 15-80% RH
  • The sample is placed, with the outer face facing down, on the sample holder.
  • If the sample consists of more than one layer and the layers are not joined together, mount the successive layers in the order and orientation in which they are used in the set. The weight of the calorimeter positioning plate is used, without additional pressure, to keep each layer in contact with each other.
  • After mounting the last (innermost) layer, the positioning plate is replaced and the calorimeter is placed in the hole of the plate, so that the copper disk is in contact with the top of the layer. more internal.
  • Quickly and smoothly move the burner into position and immediately open the shutter, if any, located below the sample, or quickly move the sample over the flame. The recording device is started, simultaneously with the exposure of the sample to the flame of the burner.
  • The test is continued until a temperature increase of at least 24 °C is observed. The exhibition ends by removing the lighter
  • Record the time required, in seconds, to achieve a 24 °C increase in the calorimeter temperature.

For each material or set of materials, a minimum of three samples will be tested.

RESULTS

INTERPRETATION OF RESULTS ACCORDING TO EN11612 AFTER PRE-TREATMENT OF SAMPLES

NIVEL DE PRESTACION

 RANGO DE VALORES HTIª24(s)

B1

4,00 < 10,0

B2

10,0 < 20,0

B3

>20,0

ª: Indice transferencia de calor según ISO EN 9151
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