ASTM D 5048
ASTM D 5048 evaluates both the burning and afterglow times and any holes that are formed as well as dripping of the burning test specimen using a 125mm flame.
Specimen:Â Four sets of five bar specimens and three plaque specimens. The bar specimens will have nominal dimensions 125mm x 13mm and thickness not to exceed 13mm. The plaque specimen will have nominal dimensions 150mm x 150mm and thickness not more than 13mm.
Specimen conditioning:Â Two sets of 5 bar specimens and 3 plaque specimens per sample to be conditioned as follows:
i. First set at 230C and relative humidity 50% for minimum of 48 hours.
ii. Second set in an air circulating oven for 168 hours at 700C and then cooled in a desiccator for minimum of 4 hours.
Gas flow:Â Set the methane gas flow to 965 ml/min with back pressure 125mm of water. Adjust the flow and air intakes of the burner to get a flame 125mm high and inner blue cone 40mm high.
Flame application:Â 125mm Bunsen burner flame.
Flame application time:Â 5 x 5 seconds flame applications with intervals of 5 seconds after each application.
Measurements:
After the 5th application of the flame record the following:
A – Afterflame and afterglow time in seconds.
B – Whether or not the flaming particles ignited the cotton.
C – Burn through (hole formation) of any specimens.
Based on the measured values using the following table to classify the material as 5VA or 5VB.
Test setup:Â The Bunsen Burner and the test specimen is set up as shown in the test schematic.
bar type test specimen
plaque type test specimen
