horizontal burning test
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UL94 horizontal burning test for classifying materials HB
The horizontal burning test evaluates the burning rate of a specimen in mm/min taking into account its thickness.
Specimen:Two sets of three specimens with nominal dimensions 125 mm x13 mm and thickness not more than 13mm.
Specimen conditioning:Condition the specimens at 230C and relative humidity 50% for minimum of 48 hours.
Gas flow:将甲烷气流设置为105 mL/min。调整燃烧器的流量和进气口，以使蓝色的蓝火焰高20mm。
Flame application:20毫米本生灯火焰
Flame application time:30 seconds. If the flame front reaches the first 25mm mark within 30 seconds the flame application is discontinued.
Measurements:
A – Whether the flame passed the 25mm mark.
B – Whether the flame passed the 100mm mark.
C – The elapsed time between 25mm and 100mm mark, if the flame passed the 100mm mark.
L – The damaged length between the 25mm and 100 mm mark.
V – The calculated liner burning rate in mm/min.
Based on the measured values use the following table to classify the material as V-0, V-1
Test setup:
The Bunsen Burner and the test specimen is setup as shown in the test schematic.
