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The test is carried out on single and multilayer materials intended for protection against heat.
The heat source for radiant heat is silicone carbide heating rods. The level of incident heat source can be varied between low, medium and high levels.
A thermal sensor is mounted behind and in contact with the specimen, which is in front of the radiator. The rise in temperature (as recorded by the sensor) over time at a given level of incident radiant source is measured. Time for reaching threshold of pain (t1) and second degree burn (t2) are calculated for classification.
The following observations are performed:
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Changes in appearance of material e.g. shrinkage, charring, discoloration, scorching, melting dripping and glowing. |
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Heat transfer levels ( t1, t2) and heat flux (t3) |
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Heat transmission factor – a measure of the fraction of heat transmitted through a specimen |
| Classification: |
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Level
C1
C2
C3
C4 |
t2, s
8 – 30
31 – 90
91 – 150
151 + |
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