We performed another igniter test. The was the same as last time but with out the pressure regulator on the propane. The pressure regulator limited the pressure to about 82 PSI on the previous test and the density of the liquid propane is very low at that pressure. The low density yielded a burn with very high oxygen to fuel ratio. The temperature was much lower. The igniter didn't glow this time but eventually the throat melted. The throat is still brass and this helps us test the temperature.

This is the last test and the pressure data reflects the throat melting.