The Lateral Ignition and Flame Spread (LIFT) apparatus was used to obtain information on the ignition and lateral flame spread characteristics of two types of composite materials. The first type was a honeycomb sandwich panel; three different facings were tested with this material. The second type of material was a composite armor. There was a substantial variation in the ignitability of the various material combinations with a vinylfaced honeycomb panel being the most ignitable and the composite armor being the least ignitable. The ignition behavior of the facings of all materials was correlated by a simple predictive model. Only the vinyl-faced honeycomb panel showed significant normal flame spread under the conditions examined, though some flame "advancement" was seen with the others. All of the materials exhibited worse flammability properties at their edges as compared to their facings.