Ablative Composite Materials from CNSL

1
Oxy-acetylene panel test
Ablative Composite Materials from CNSL
Oxy-acetylene panel test (ASTM 285 - 70) for
ablative materials shows the survival of a flower
for 100 sec. kept on the 6.35 mm asbestos fibre
reinforced hexamine cured panel. The ablation
rate value of this material was 3.2x10-3 in/s in
comparison to 3.6 x10-3 in/s for asbestos
-phenolic. As the char content of PBPCP was only
27 compared to 60 for conventional phenolics,
mechanisms involving transpiration processes
rather than heat blocking by char formation might
be playing a higher role in this case.