BS EN 60695-11-20 / IEC 60695-11-20
BS EN 60695-11-20 / IEC 60695-11-20 measures the comparative burning characteristics and resistance to burning through of solid plastics using a 125mm flame classification provided: 5VA or 5VB. The horizontal burning test evaluates the burning rate of a specimen in mm/min taking into account its thickness.
Specimen:Â Two sets of three specimens with nominal dimensions 125 mm x13 mm and thickness not more than 13mm.
Specimen conditioning:Â Condition the specimens at 230C and relative humidity 50% for minimum of 48 hours.
Gas flow:Â Set the methane gas flow to 105 ml/min. Adjust the flow and air intakes of the burner to get a clean blue flame 20mm high.
Flame application:Â 20mm Bunsen burner flame
Flame application time:Â 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 5VA or 5VB.
Test setup:Â The Bunsen Burner and the test specimen is setup as shown in the test schematic.
bart type test specimen
plaque type test specimen
