Ignition of some woods exposed to low level thermal radiation : : second progress report

Delayed ignition flame spread data by the radiant panel test are compared with standard flame spread and uniform flux data on a typical compressed cellulosic board. The importance of thermal conduction within a thin surface layer in the spread of flames is shown. Results of tests performed to evaluate the effects of longitudinal thermal conduction are presented. Surface temperatures were measured and the effect of the presence of the flame upon them determined. An attempt is made to show the possible compatibility of two ignition criteria, a minimum surface temperature and a minimum rate of volatile generation.